900RR Headers with Scorpion Can - Wrist Twisters
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post #1 of 100 Old 11-29-2008, 02:42 PM Thread Starter
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900RR Headers with Scorpion Can

Well I decided to bite the bullet and do the 900RR single sided exhaust mod. I didn't mind the stock mufflers so much for the sound, but I like riding to work when its nice, and the exhaust smell would seem to follow me into the office.

Heres where it started. Bought a set of headers ('99 I think) in great condition from a WT member (sourbeer).



I know they will never stay this way but I was surprised how well they cleaned up.



Decided on a Can...Scorpion Street Extreme. I like the shorter can look. The inlet is ID is 63 mm and the 900RR header OD is 60mm, so seemed like a pretty good fit to slip-on. It has removable baffle ("DB Killer").



Here's a few pics of it finished






More pics here of different parts of the install 900RR Install. The hardest part of the install was definitely removing the Y-pipe. I jacked the bike up and disconnected the lower shock bolt and removed the tire hugger, still couldn't work it out without disconnecting the top of the shock too. If you do this definitely get help with that part of it.


Total Cost about $400. Header ($80), Can ($293), New Gaskets ($15), Misc Hardware (about $20).

I'll get some sound clips and post them in the next few days. Only ran it for a few mins and rode around the neighborhood. It sounds good, deeper & louder than stock but not obnoxious.

Thanks to everyone here who posted their installs and advice, would have never attempted in without it. This really is a great forum.

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post #2 of 100 Old 11-29-2008, 02:56 PM
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Looks awesome. Love that Scorpion can.

Do you have a PC3 on it?

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post #3 of 100 Old 11-29-2008, 03:07 PM
 
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Do you have a power commander? if not a do you think this mod is ok to do with out one?

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post #4 of 100 Old 11-29-2008, 03:56 PM
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post #5 of 100 Old 11-29-2008, 03:56 PM Thread Starter
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I don't have a PC3 on it yet. I figured no matter which can I went with it wasn't designed for the 919. There's a place about 20 miles from here that does dyno testing. I may take it there and get them to check it out and see if I need to re-map.

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post #6 of 100 Old 11-29-2008, 04:10 PM
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One of the best looking 900RR exhaust conversions I have seen on a 919. The shorty can looks sharp.

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post #7 of 100 Old 11-29-2008, 04:53 PM
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That looks great, Mike.
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post #8 of 100 Old 11-29-2008, 05:01 PM
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Love the look of that scorpion can. Can't wait to hear it!

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post #9 of 100 Old 11-29-2008, 05:06 PM
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WOW, Mike, that frickin' looks fantastic.

Ok, forget everything I've posted about "novice" "invest in my skills first" "take on risk responsibly" blah blah blah.

I wanna do that mod.

Now.

And ride the s*** out of it.

I flippin' no longer care what kind of example I'm setting for my children.

Now excuse while I go prepare for the "you're either with me or against me" discussion with my wife...

Really nice piece of work, Mike.

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post #10 of 100 Old 11-29-2008, 05:42 PM
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Looking real good Mike.

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post #11 of 100 Old 11-29-2008, 06:21 PM
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Quote:
Originally Posted by Nesty View Post
WOW, Mike, that frickin' looks fantastic.

Ok, forget everything I've posted about "novice" "invest in my skills first" "take on risk responsibly" blah blah blah.

I wanna do that mod.

Now.

And ride the s*** out of it.

I flippin' no longer care what kind of example I'm setting for my children.

Now excuse while I go prepare for the "you're either with me or against me" discussion with my wife...

Really nice piece of work, Mike.





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post #12 of 100 Old 11-29-2008, 08:19 PM
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That is a great setup you got there. It goes along with the bike quite well...all cleaned and polished up.

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post #13 of 100 Old 11-30-2008, 12:33 AM
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ooh that looks sooo nice and shiny, makes ya arse look damn fine too.

very nice.

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post #14 of 100 Old 11-30-2008, 05:02 AM
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Quote:
Originally Posted by marylandmike View Post
I don't have a PC3 on it yet. I figured no matter which can I went with it wasn't designed for the 919. There's a place about 20 miles from here that does dyno testing. I may take it there and get them to check it out and see if I need to re-map.
Great idea. I opted for the PC after adding Sato cans. But in retrospect, all I really needed was a pair of semi_gray's block off plates to stop the deceleration popping. If I were to do it all over again, I'm not sure I would add the PC. It's a nice-to-have, not a need-to-have and adds a point of failure that has a fairly high failure rate. Just my .02

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post #15 of 100 Old 11-30-2008, 05:30 AM
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Quote:
Originally Posted by Ken View Post
If I were to do it all over again, I'm not sure I would add the PC. It's a nice-to-have, not a need-to-have and adds a point of failure that has a fairly high failure rate. Just my .02
I guess this is due to the fact that the 9er runs rich already? I know when I did the bafflectomy, it started running warmer. My brother in law put a two brothers can on his 600RR and now it will jump up to 220 degrees and kick on the fan just stopping for a minute or two and leaving it idling. He has been told a PCIII will fix that once he get's his mix right again.

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post #16 of 100 Old 11-30-2008, 06:00 AM Thread Starter
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Thanks everyone for the positive comments. I really appreciate it...and Nesty thats the funniest post I have ever read

I have always liked the look of the undertail exhaust and its really one of the things that I liked about the 9'er before I bought it, so I held out on doing the mod. Now that its done I like this look too.

Ken, CMurphy, Harvey...I hope I don't need a PC3 for the same reasons that Ken said, just another point of failure. I would assume since the 9'er runs kind of rich in the stock condition (based of the sooty film on everything near the exhaust) that the danger of adding more flow is that it may kick it over to the lean side. I have found some symptoms to look for for lean running:

- Poor acceleration - feels flat
- Engine doesn't respond when throttle is snapped open - picks up speed as
throttle is closed
- Engine runs hot, knocks, pings and overheats
- Engine surges or "hunts" when cruising at part throttle
- Popping/ spitting when throttle is opened, or popping and
spitting through pipe on deceleration with a closed throttle
- Engine runs better in warm weather, worse in cool
- Performance gets worse when the air filter is removed

I haven't gotten a good ride in since I finished and its raining today, but I think I'll keep an eye out for these things.


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post #17 of 100 Old 11-30-2008, 06:38 AM
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Great job. The shorty can really makes a visual difference.

'02 Honda 919 - She's the only one for me!

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post #18 of 100 Old 11-30-2008, 06:42 AM
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Quote:
Originally Posted by marylandmike View Post
Well I decided to bite the bullet and do the 900RR single sided exhaust mod.
That looks AWESOME Mike...Great work...And by the way, I'm thirsty...Can you spare some Diet Dr. Thunder
Quote:
Originally Posted by Nesty View Post
WOW, Mike, that frickin' looks fantastic.

Ok, forget everything I've posted about "novice" "invest in my skills first" "take on risk responsibly" blah blah blah.

I wanna do that mod.

Now.

And ride the s*** out of it.

I flippin' no longer care what kind of example I'm setting for my children.

Now excuse while I go prepare for the "you're either with me or against me" discussion with my wife...

Really nice piece of work, Mike.
Bwaahaaahaaahaaa


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post #19 of 100 Old 11-30-2008, 10:09 AM
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I edited all symptoms that I haven't seen on my 919.

Quote:
Originally Posted by marylandmike View Post
I have found some symptoms to look for for lean running:

- Engine doesn't respond when throttle is snapped open - picks up speed as
throttle is closed

- Popping/ spitting when throttle is opened, or popping and
spitting through pipe on deceleration with a closed throttle

- Engine runs better in warm weather, worse in cool
Although my single-sided exhaust conversion uses the stock 919 headers, I have found cold-weather running to alter performance. I don't have a PC3 and the bike wasn't dyno tested. The biggest complaint is initial throttle response, but only slightly, noticeable in first and second at lower RPM's. This wasn't a problem until the weather dipped into the 50's and below, so perhaps that correlates with your idea that the engine runs better in warmer weather?

The popping only happens on decelerations after quick accelerations, again mostly when colder out.

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post #20 of 100 Old 11-30-2008, 01:30 PM Thread Starter
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Quote:
Originally Posted by vtwin996rider View Post
That looks AWESOME Mike...Great work...And by the way, I'm thirsty...Can you spare some Diet Dr. Thunder
Sure but are you sure you wouldn't rather have some "Mountain Lion"....its was a very good year...I gotta save all I can doing these mods...


Quote:
Originally Posted by jeffcycles View Post
I edited all symptoms that I haven't seen on my 919.

Although my single-sided exhaust conversion uses the stock 919 headers, I have found cold-weather running to alter performance. I don't have a PC3 and the bike wasn't dyno tested. The biggest complaint is initial throttle response, but only slightly, noticeable in first and second at lower RPM's. This wasn't a problem until the weather dipped into the 50's and below, so perhaps that correlates with your idea that the engine runs better in warmer weather?

The popping only happens on decelerations after quick accelerations, again mostly when colder out.
Thanks Jeff...I am sure I may find about the same. Just revving it and letting go of the throttle quickly it will give a little pop once in a while. The running lean symptoms I found on another site...a starting point anyway.

Raining all day today here, but I took a video of it running. It's in the garage so it sounds alot louder than it would outside, but you can get an idea of the tone.


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post #21 of 100 Old 11-30-2008, 02:56 PM
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sounds sweet.... mine has no baffleing in the can... has a more raspy barky noisey thing ..... yours sounds better than mine



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post #22 of 100 Old 11-30-2008, 03:36 PM
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I really like the tone of that! Nice, warm and deep, without becoming to raspy.

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post #23 of 100 Old 11-30-2008, 05:45 PM
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great tone! the 1k-3k is deep and throaty/bassy. Midrange roar is clean too!

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post #24 of 100 Old 11-30-2008, 08:56 PM
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Wow not only looks very good but sounds great. Nice job!

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post #25 of 100 Old 12-01-2008, 05:00 AM
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I like it. Nice job.

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post #26 of 100 Old 12-01-2008, 08:27 AM
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Duuude!!!! Sweeet!!!!!.........Ok thats enough of that "dude wheres my car shiiit" I got the pipe now I know witch can is in my future. Thanks great post.

How much Where from on the Scorpion?

Diet Dr. Thunder????????? WTF Have a diet coke my man. Come to Chicago I'll buy.

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post #27 of 100 Old 12-01-2008, 09:52 AM
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Looks badass!

Strange perhaps, but I'd like to see this set up on a bike with Dunlop 616's (I think exposing that cool looking rear tire even more would look hot.)

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post #28 of 100 Old 12-01-2008, 01:12 PM
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919 goes Moto GP. Really cool.

The decel popping might go away with AIS block off plates.

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post #29 of 100 Old 12-01-2008, 02:50 PM
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Sounds really good Mike!


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post #30 of 100 Old 12-01-2008, 04:23 PM Thread Starter
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Thanks everyone. Can't wait to get some riding in when the weather clears a bit.


Quote:
Originally Posted by riquefied919 View Post
Duuude!!!! Sweeet!!!!!.........Ok thats enough of that "dude wheres my car shiiit" I got the pipe now I know witch can is in my future. Thanks great post.

How much Where from on the Scorpion?

Diet Dr. Thunder????????? WTF Have a diet coke my man. Come to Chicago I'll buy.
I bought the can from Motorcycle Superstore for $325. I had a coupon that I got in e-mail for 10% off so it was $293 and free shipping.

They also have them at New Enough for about the same price. There is a carbon fiber model for about $100 more. They don't make one for the 919 or 900RR, so I had to decide which model bike to order it for...ended up getting the one for an '05 Kawi ZX-10R...cuz it's a liter bike and it came with a link pipe that I thought would be a good adapter in case the can didn't clear the rearset...turned out not to be a problem tho. Motorcycle Superstore & New Enough had the best prices of retailers I had dealt with, but if you want to see better pics of all the hardware that comes with it check them out at Dennis Kirk.

If you're adventurous, I found them for $238 here....but I didnt know how reliable they were.

Good luck!

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post #31 of 100 Old 12-01-2008, 05:40 PM
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Great mod!! Thanks for the youtube post. Glad you didn't rev the poor bike like some guys do on youtube, ouch:
http://uk.youtube.com/watch?v=DLXZ-mbPqos

Will wait eagerly for your ride report!

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post #32 of 100 Old 12-01-2008, 06:54 PM
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I have to admit that I'm impressed, Mike.
90% of the Mechanical Engineers that I've worked with could talk a good game but couldn't wrench their way out of a paper bag.
And, geez, even more impressive, considering where you went to school. :001_smile:
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post #33 of 100 Old 12-01-2008, 07:53 PM Thread Starter
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Quote:
Originally Posted by Kristen View Post
I have to admit that I'm impressed, Mike.
90% of the Mechanical Engineers that I've worked with could talk a good game but couldn't wrench their way out of a paper bag.
And, geez, even more impressive, considering where you went to school. :001_smile:
Thanks Kristen, I'm not a great mechanic, but I like trying to figure out how to do stuff and I can't underestimate how much this forum helps. I have learned so much here. I have nearly 16K miles, so my next challenge is valve clearance checks.

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post #34 of 100 Old 12-06-2008, 12:37 PM Thread Starter
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Update

After a week and a few hours of riding the bike seemed to be running great. If I blipped the throttle a few times in a row I would get a little pop in the can, but didn't seem like any big deal. Power and responsiveness seemed to be as good or better than stock, but it could have been my imagination, just because of the sound.

All that being said, I just had to know.....sooooo this is how I spent my afternoon.



I got the name of the shop (Powerhouse Cycle in Owings, MD) from the dynojet website as an authorized PCIII tuning center. The guys at the shop loved the bike and were so excited not to have to remove fairings to get to stuff. They called it the "torque monster".

...and the best news of all is I don't need a PCIII...the owner said it seemed like the bike had already been tuned and was running great and one of the other guys said that had to be a first.

He wasn't able to give me a printout or anything, but I didn't complain as he only charged me $50 to test it for me.

Due to liability I couldn't be right there during most of the test, but at the end he called me over and I stood up on the platform and he ran the bike from idle to WOT and gave me his evaluation.

He said at idle the A/F ratio was perfect and at cruising speed of 70MPH the AFR was about 13.5 which is really good, when he went WOT it dropped to about 12.7, which he said was Rich but it snapped right back to around 13.5, and running rich is better for the motor than running lean.

I didn't do the mod for performance reasons, but I asked him what the peak HP was during his runs and my jaw dropped when he said 135.

It was a cold 40 mile ride each way, but time & money well spent for peace of mind at least. I would highly recommend the shop for anyone else in the MD/ DC area.

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post #35 of 100 Old 12-06-2008, 12:48 PM
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135hp ...And I'm assuming that is to the ground also? That is awesome


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post #36 of 100 Old 12-06-2008, 01:05 PM
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Neat project and story. Keep it going!

The bike sounds very very nice and a cool muffler selection.

Although you might get challenged for the 135hp.

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post #37 of 100 Old 12-06-2008, 01:20 PM Thread Starter
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Quote:
Originally Posted by vtwin996rider View Post
135hp ...And I'm assuming that is to the ground also? That is awesome
Quote:
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Neat project and story. Keep it going!

The bike sounds very very nice and a cool muffler selection.

Although you might get challenged for the 135hp.
Yeah, I'm not sure I believe 135HP either. I didn't see it myself, just what the guy said. I did see the AFR readings tho and thats what I wanted it tested for anyway.

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post #38 of 100 Old 12-06-2008, 01:25 PM
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Hey Mike: No way the 919 will make that kind of HP unless you put it on the NOS juice. Realistically expect around 105 -110.

If this tuner claims 135 I might also question his A/F results.

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post #39 of 100 Old 12-06-2008, 01:30 PM
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Is your PAIR still installed? If it is then the pop is from that. It then would also make your A/F leaner. But having a true 13.5 A/F is the best, in my experience, for n/a tuning. Though running richer will also help cool the cylinders...especially in motorcycle engines.

The 135 will indeed be challenged. I wonder what factors the operator used during the run.

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post #40 of 100 Old 12-06-2008, 01:30 PM
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That is why I posted...I was curius too...135 seemed high?


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