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› petcock? fuel issue at full throttle
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petcock? fuel issue at full throttle (Read 86 times)
shorty
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petcock? fuel issue at full throttle
08/31/16 at 08:07:08
hello all, I have done the mod to stock petcock (found here) and for a year there has been no issues.. Now at full throttle the the power surges like it does if I need to switch to reserve (low fuel).. I have disassembled the carb and cleaned all orifices (looked fine).. Pulling out the enrich knob makes no difference while problem develops.. this happens 50% of the time when at full throttle.. It is not a misfire like a fouling plug.. MY THOUGHTS are petcock dribbling fuel too slow for full throttle, or float needle misbehaving, or that TEV diaphram sticking, I could not get the screws out that secure TEV cover
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motorcycles have been my main transport since 1974
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justin_o_guy2
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What happened?
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Re: petcock? fuel issue at full throttle
Reply #1 -
08/31/16 at 08:14:27
Put it on
Prime.
You bypass the vacuum and the diaphragm.
At WFO your vacuum is low. If the diaphragm is stiff you can experience low fuel.
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bobert_FSO
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Re: petcock? fuel issue at full throttle
Reply #2 -
08/31/16 at 08:29:20
What JOG said. The petcocks fail in one of two ways.
1) The diaphram leaks and fuel does not shut off.
2) The diaphram gets stiff and in low vacuum situations, will not pass enough fuel.
You sound like problem 2. That's what happened to me. I first noticed stalling when slowing to idle in cold weather. Then on a 300 mi trip with some buddies, we rode faster (65mph) then I normally do and on the return trip was bucking a 25mph headwind. The result was a low vacuum event. After a couple of minutes under these conditions, my Savage would begin stumbling like I was running out of gas. Flipping to PRIME would result in the engine picking back up like normal. After this happened about 5 or 6 times I left it on prime. I had no reserve, but I kept close track of how many miles I had travelled.
The next day, I ordered a Raptor petcock.
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justin_o_guy2
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East Texas, 1/2 dallas/la.
Re: petcock? fuel issue at full throttle
Reply #3 -
08/31/16 at 08:32:34
Or, a ride to the Yamaha shop and a little under thirty bucks and you're good. No waiting, no wondering if it's
The Real Deal.
And much less likely to get your credit card information messed with.
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The people never give up their liberties but under some delusion.- Edmund Burke.
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shorty
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be careful out there
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Re: petcock? fuel issue at full throttle
Reply #4 -
08/31/16 at 09:53:20
thanks
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Kris01
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Re: petcock? fuel issue at full throttle
Reply #5 -
08/31/16 at 18:36:57
shorty wrote
on 08/31/16 at 08:07:08:
hello all, I have done the mod to stock petcock (found here)...
What mod? Raptor?
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There's no problem that a full tank of gas and a sunny day can't fix!
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shorty
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be careful out there
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Re: petcock? fuel issue at full throttle
Reply #6 -
09/05/16 at 12:07:51
the mod to stock petcock, eliminates the vacuum diaphragm, on-off-reserve like the old style.. just plug the vacuum port on carb
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shorty
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be careful out there
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southern NM
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found problem/full throttle loss
Reply #7 -
09/05/16 at 12:13:26
bike ran perfect except for power loss at full throttle, the slide (in carb) was sticking/dragging... cleaned it, problem gone
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