Cutting out at top end - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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post #1 of 11 (permalink) Old 06-23-2014, 10:29 AM Thread Starter
Crowley
 
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Cutting out at top end

-Ear shaved
-straight pipes to rear axle with - 4" baffles
-42 pilot, 140 main, 2 shims

Everything has been fine on the road, but yesterday somewhere around 5500 or 6k, the bike started cutting out at wot. Hadn't done this before, and I wot every day.

Had a friend drive behind me and he said I'm blowing black /Grey smoke at top end. Sounds rich to me... Which is strange because the 42 pilot is difficult to tune rich, but the 140 main is too rich?

Already tried the back blow... I don't know what else could cause a problem after a month of running fine. I have in line fuel filters (no petcock screen) so debris is highly unlikely.

I'm thinking about removing a shim from each needle and seeing how that goes before I rip carbs off and change jets


Input?
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post #2 of 11 (permalink) Old 06-23-2014, 12:38 PM Thread Starter
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Achoo
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post #3 of 11 (permalink) Old 06-23-2014, 02:57 PM
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I am going to stay out of this, the whole thing is too rich for my tastes.
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post #4 of 11 (permalink) Old 06-23-2014, 03:25 PM Thread Starter
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... Okay...
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post #5 of 11 (permalink) Old 06-23-2014, 03:30 PM
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Maybe your pet cock is having issues?

2014 Kawasaki KLR 650
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post #6 of 11 (permalink) Old 06-23-2014, 03:34 PM Thread Starter
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Fuel filters stay full so flow isn't an issue. I have a tw200 petcock too
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post #7 of 11 (permalink) Old 06-23-2014, 04:44 PM
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Are you sure the fuel filters aren't the problem? Have you tried running the fuel lines straight from the petcock to the carbs without the fuel filters? I've read posts about issues with inline filters in the past and the bike doesn't come with inline filters in stock form.

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Originally Posted by LibertyPilot View Post
Leave it to me to NOT be fond of something then end up banging it.
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post #8 of 11 (permalink) Old 06-24-2014, 01:28 AM Thread Starter
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I'll get some straight tubing tomorrow maybe and replace them - I just wish I had a petcock screen the tank. I just have the tube
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post #9 of 11 (permalink) Old 06-24-2014, 06:50 AM
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Fuel bowl vent?
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post #10 of 11 (permalink) Old 06-24-2014, 07:45 AM
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Yeah I'm not familiar with how the tw200 petcock looks inside the tank. I know my old petcock had no screens left, which is why I ended up with my carb issues a year ago and also why I have a new petcock now. I had looked into putting inline filters in at that point but I was convinced by folks on here that it could cause issues. So I got the new petcock instead. Really a shame that Kawasaki didn't see fit to make those screens a replaceable part.

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Leave it to me to NOT be fond of something then end up banging it.
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