My 919's a three cylinder (and not in a good Triumph sort of way) - Wrist Twisters
 
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post #1 of 24 Old 05-25-2010, 12:48 PM Thread Starter
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Unhappy My 919's a three cylinder (and not in a good Triumph sort of way)

So there I was enjoying a lovely sunny weekend cruising around Hawaii when something horrible happened -my beautiful Honda suddenly morphed into a Harley! By which I mean a stumbling, bumbling, rumbling, backfiring barely road-worthy pig-whore.

I managed to limp home and set about figuring out what went wrong. The bike is clearly not running on all four cylinders. When at idle or low RPM, the engine runs rough, backfires off the throttle, lurches while accelerating, etc. It clears up around 4k or so and behaves like it's suppose to (for the most part).

The first and easiest fix that came to mind was replacing the plugs. I had a spare set lying around and to be honest, they were long overdue for a swap to begin with. After 30 minutes of scraping my knuckles and cursing the children of whoever okayed the placement of cylinder 3, the task was done. All the plugs looked remarkably well given the obvious neglect of the previous owner but plugs 2 3 were noticeably dirtier than 1 4 and there was a distinct petrol smell coming from cylinders 2 3 when I was working on them.

Started the bike up… Same result. Obviously a fouled plug is not to blame. This would lead me to believe that the ignition coil that 2 3 share is starting to fail. Typically I’m a huge proponent of the “plug and chug” troubleshooting methodology since it involves less critical thinking and more trips the dealership (aka candyland) but since I’m on a student budget at the moment, I can’t really afford to purchase a new 919, one genuine Honda part at a time.

So here’s my attempt to get some use out of the pudding mash I normally fill my helmet with:

I think it’s most likely one of these three at fault:
  1. 2/3 ignition coil – for the reasons stated above
  2. Clogged injector – this one could be masked behind a different spray pattern at higher the RPMs
  3. Interconnected wiring – just because something looks pretty on the outside doesn’t mean that it works (my gf is a prime example of this )

My question to you gentleman is: How do I determine which one (if any) is the culprit with only common mechanics tools, a multimeter, and a fifth of bourbon at my disposal?

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post #2 of 24 Old 05-25-2010, 12:54 PM
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reef....check this thread too..bad fuel pressure regulator will also foul #2, 3 plugs

https://wristtwisters.com/naked-bikes...yet-again.html

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post #3 of 24 Old 05-25-2010, 01:02 PM
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yep, that's a f.p.r.

i'll put a case of beer on it, so long as whoever fixes it doesn't replace a dozen components that it doesn't need.

unless you put some bad fuel in it...you might be eating water or some contaminant, but i'm still putting a case of beer on the fpr.

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post #4 of 24 Old 05-25-2010, 01:02 PM Thread Starter
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Hmm, I was really hoping that your link would have me do something really simplistic like "dial volume to 11 and rock out". Looks like I'll actually have some work to do

I was thinking about running the plug caps to the voltmeter and see if the plugs are getting juice. Brilliant idea or just a quick trip to the emergency room?

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post #5 of 24 Old 05-25-2010, 01:07 PM
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I have not work on my 919 at all yet, so I am not sure if you can do this or not. But I would swap the suspect coil and the "Good" coil around and if the problem moves to 1,4 then you know you have a bad coil.

Never Trade the Thrills of Living for the Security of Existence.
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post #6 of 24 Old 05-25-2010, 02:33 PM
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My money's on the FPR, They're not as hard to swap as it looks. Simple test is to pull the vacume line off the FPR, if there's any fuel in the line it's toast. The FPR pulls vacume off the #2 and #3 cylinder.


Dan
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post #7 of 24 Old 05-25-2010, 03:32 PM
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coils REALLY don't just go bad in the middle of a ride.
FPR s fail fairly commonly on these bikes, are easy to replace.

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post #8 of 24 Old 05-25-2010, 03:59 PM
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Was there ever a "photage" of the where on these things?

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post #9 of 24 Old 05-25-2010, 04:27 PM
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ya sounds like a Fuel Pressure Regulator.... ill put a second case o beer on it.

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post #10 of 24 Old 05-25-2010, 05:24 PM
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Same issues a couple of months ago. Started running rich then a cylinder stopped firing altogether. Getting the FPR checked and replaced solved the problem.

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post #11 of 24 Old 05-25-2010, 05:57 PM
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Is the FPR a part us 919 owners should have on the shelf? How commonly do they fail?

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post #12 of 24 Old 05-25-2010, 07:24 PM
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Quote:
Originally Posted by rmb View Post
Is the FPR a part us 919 owners should have on the shelf? How commonly do they fail?
The FPR seems to be one of the few things that is a common failure part on the 919...by common failure, I mean that it ever fails at all. Aside from things such as clutch/throttle cables, chains/sprockets, and normal maintenance items, it sounds like (from what I've read) like it's the one thing most likely to fail at some point. I wouldn't say that the probability of failure is high enough to say that everyone should have an extra on the garage shelf, though.

Well, fire the engines! Spur this iron space-pony on!

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post #13 of 24 Old 05-25-2010, 08:47 PM
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You can do it.....lol

Easy enough to figure out right? Check the FPR for smell....then switch the coils if your still curious...if the problem remains the same after switching coils, and you have FPR smell (and it can be faint, if it's a STRONG smell....nuff said)....you have your answer





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post #14 of 24 Old 05-26-2010, 02:01 PM
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Quote:
Originally Posted by rmb View Post
Is the FPR a part us 919 owners should have on the shelf? How commonly do they fail?
In all of my experiences thus far, nothing has ever been sitting "on the shelf" for my 919er with the exception of light bulbs! My parts have always had to be ordered and just for example my waterpump is currently on back order! However, it is also an example of how truly exclusive this bike is.
James

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post #15 of 24 Old 05-26-2010, 04:48 PM
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yeah, be glad you don't have a first year Bimota.


just google Service Honda and order an FPR for cryin out loud.

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post #16 of 24 Old 05-26-2010, 05:41 PM Thread Starter
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Look at all the people putting beer up for ante! In my mind, that makes it a sure thing; after all, who would wager beer on a foolish bet?

Local shop says that part's $83. Why is it never a $3 screw that fails? Although I suppose it could be worse. When I go head home today I'm going to 1. Figure out what a FPR even looks like and 2. Sniff hoses, I suppose. Thanks for the link Mike, I'm sure it'll make more sense once I get an idea how everything's connected.

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post #17 of 24 Old 05-26-2010, 05:52 PM Thread Starter
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From Servicehonda (Thanks for the reference BTW).

Part# 16740-MCZ-013 $59.12
Located under "Throttle Body (Assy)" #12.

Wish I could direct link the page. I'm relatively certain this is the right part, anyone think I'm way off-base?

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post #18 of 24 Old 05-26-2010, 06:05 PM
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That's it.

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post #19 of 24 Old 05-26-2010, 08:04 PM
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Quote:
Originally Posted by gotreef View Post
Why is it never a $3 screw that fails?
Because screws at a dealership are more like $8

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post #20 of 24 Old 05-27-2010, 07:59 AM
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Quote:
Originally Posted by gotreef View Post
Why is it never a $3 screw that fails?
consider it a good thing that a $3.00 screw doesnt fail. cuz often times when something of that sort does happen, you gotta drill the screw out, try to use ez-out. when that fails you then redrill and try to re-tap. then that fails and you go for a heli-coil.... you spend time, $$$$, and a whole lotta :curs ing: the simplest things to fail often tend to be the hardest/most grief giving.

but ur right, it could be worse... such as your ecu.... $780+ .... ouch!

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post #21 of 24 Old 05-27-2010, 08:40 AM
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It's not as difficult as it looks, kinda tight in there but not too bad.


It looks alot like #12


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post #22 of 24 Old 05-27-2010, 09:23 AM
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Give us the # from the diagram above that we should be looking at.

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post #23 of 24 Old 05-27-2010, 09:25 AM
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it's #12. in the upper right hand corner of the diagram.

Well, fire the engines! Spur this iron space-pony on!

"The Shadow"
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post #24 of 24 Old 05-27-2010, 03:19 PM Thread Starter
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Quote:
Originally Posted by Pvster View Post
consider it a good thing that a $3.00 screw doesnt fail. cuz often times when something of that sort does happen, you gotta drill the screw out, try to use ez-out. when that fails you then redrill and try to re-tap. then that fails and you go for a heli-coil.... you spend time, $$$$, and a whole lotta :curs ing: the simplest things to fail often tend to be the hardest/most grief giving.

but ur right, it could be worse... such as your ecu.... $780+ .... ouch!
I remember swapping out the headers for my old 929 and having the the threaded rod break off... in the engine block. That was heaps of fun extracting it

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