Puff of blue smoke under heavy acceleratio. - Wrist Twisters
 
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post #1 of 23 Old 02-25-2014, 03:48 PM Thread Starter
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Puff of blue smoke under heavy acceleratio.

Had my father in town these last couple days and he noticed when I get on it, a puff of blue smoke comes out.. where is oil gettin in I wonder, what can I do myself to check into this

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post #2 of 23 Old 02-25-2014, 04:04 PM
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You sure it's not the fuel pressure regulator? You can check by starting the bike cold and seeing if 2 & 3 header heats up differently than 1 and 4. You can also swap one of the vacuum lines (forget which) to a clear tube and see if you have fuel going into it, if it does then you've got a faulty FPR.

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post #3 of 23 Old 02-25-2014, 04:14 PM
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Just pull the vac line off the FPR, when mine went bad gas ran out of the vac port when I pulled the line off


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post #4 of 23 Old 02-25-2014, 04:22 PM Thread Starter
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Fpr... I replaced that last month.

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post #5 of 23 Old 02-25-2014, 04:24 PM
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Just my experience but, when mine went out, it sooted up the pipe ends, smoked black when you blipped the throttle and blubbered on the bottom. Check it for sure but it might be ok.

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post #6 of 23 Old 02-25-2014, 04:32 PM
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Quote:
Originally Posted by Callinmeupward View Post
Fpr... I replaced that last month.
Have you checked your oil level? Seems simple but if your FPR went south and you didn't change oil, it could be overfilled and contaminated.

Other than that...

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post #7 of 23 Old 02-25-2014, 04:43 PM Thread Starter
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Quote:
Originally Posted by andrewebay1 View Post

Have you checked your oil level? Seems simple but if your FPR went south and you didn't change oil, it could be overfilled and contaminated.

Other than that...
Hu? Im trying to make sense of your reply man but lol I just cant. I know what your saying but the two in conjunction dont add up. Why do you see the fpr going bad having something to do with the oil?

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post #8 of 23 Old 02-25-2014, 04:45 PM Thread Starter
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And hrc...the yoshis do have a light film of soot... father says puff of blue smoke though.

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post #9 of 23 Old 02-25-2014, 04:55 PM
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Quote:
Originally Posted by Callinmeupward View Post
Hu? Im trying to make sense of your reply man but lol I just cant. I know what your saying but the two in conjunction dont add up. Why do you see the fpr going bad having something to do with the oil?
To my understanding if the FPR was leaking badly it could be flooding the cylinders with fuel which then contaminates the oil. A minor leak probably wouldn't effect the oil but heavy saturation and fuel is probably got to your oil.

Someone correct me if that train of thought is wrong.

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post #10 of 23 Old 02-25-2014, 04:57 PM Thread Starter
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Quote:
Originally Posted by andrewebay1 View Post

To my understanding if the FPR was leaking badly it could be flooding the cylinders with fuel which then contaminates the oil. A minor leak probably wouldn't effect the oil but heavy saturation and fuel is probably getting to your oil.

Someone correct me if that train of thought is wrong.
Ahhhh and with fuel returning to the case as oil does it could cause overfilled symptoms...

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post #11 of 23 Old 02-25-2014, 05:04 PM Thread Starter
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Just checked oil in sight glass...its low and looks like new..which it is...changed it before winter..

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post #12 of 23 Old 02-25-2014, 05:12 PM
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Quote:
Originally Posted by Callinmeupward View Post
And hrc...the yoshis do have a light film of soot... father says puff of blue smoke though.
Could be yours is going out and mine was gone. Blip the throttle with the bike on the stand. Mine was easy to see. The first thing I noticed though was the poor off idle performance and the erratic idle.

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post #13 of 23 Old 02-25-2014, 05:14 PM Thread Starter
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Quote:
Originally Posted by HRC27 View Post

Could be yours is going out and mine was gone. Blip the throttle with the bike on the stand. Mine was easy to see. The first thing I noticed though was the poor off idle performance and the erratic idle.
I think you missed me saying ive replaced the fpr recently...

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post #14 of 23 Old 02-25-2014, 05:15 PM
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Quote:
Originally Posted by Callinmeupward View Post
I think you missed me saying ive replaced the fpr recently...
Yes sir I did.

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post #15 of 23 Old 02-25-2014, 05:20 PM Thread Starter
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Surely rings cant be bad?

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post #16 of 23 Old 02-25-2014, 05:43 PM
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I'd still change the oil just to make sure it's not contaminated.

Would fuel in oil make it easier to pass the rings?

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post #17 of 23 Old 02-25-2014, 06:18 PM
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Quote:
Originally Posted by andrewebay1 View Post
I'd still change the oil just to make sure it's not contaminated.

Would fuel in oil make it easier to pass the rings?
Yes it would. Fuel would thin out the oil easily.

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post #18 of 23 Old 02-25-2014, 06:24 PM
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Are you sure it blue and not black? 919's run rich and almost always puff when you hit WOT.

Spoiler:

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post #19 of 23 Old 02-25-2014, 06:30 PM Thread Starter
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My father said a blue puff...and going through his text he said he thought he smelled oil.

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post #20 of 23 Old 02-25-2014, 07:07 PM
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I myself would try to recreate it, with a friend riding and witness it yourself.

Then change the oil, top it up and keep an eye on it .... see if u can notice the level dropping.

If u are still not convinced, pull the plugs and give them a visual inspection. Then do a compression test & a leak down test .... you can reverse engineer a compression tester into a leak down tester easy enough.

I honestly doubt it has a ring or valve seal issue, I would side with Rickard .... the 9'er runs rich as hell and the unburnt fuel makes the exhaust visible sometimes.

If you do find it uses a little oil just buy a bucket of rotella and stay on top of it and overhaul or replace the motor when/if it becomes a major issue.

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post #21 of 23 Old 02-25-2014, 09:50 PM
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Mine puffed blue once when my son gave it a big rev by accident. Does not use oil or if it does its not much. Doesnt do it at the track.

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post #22 of 23 Old 02-25-2014, 10:06 PM
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Quote:
Originally Posted by rickard919 View Post
Are you sure it blue and not black? 919's run rich and almost always puff when you hit WOT.
THIS. Osiris' bike did it all the time, never had any issues. It's because the bike runs so rich.

Move to a 900rr lower header and more free flowing pipes and good map on a Power Commander and it all but disappears. On same bike.

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post #23 of 23 Old 02-27-2014, 04:58 AM
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The 919 does run rich I agree, but in my experience, a regularly thrashed 919 will burn a little oil. As you say the oil is low.....was it filled correctly? because if it was that could be the cause of the blue smoke. So, its either rings or valves. Was the motor cold when he saw you ride?

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