TRX250R.ORG
Workshop => Carburetor, Intake, and Exhaust => Topic started by: hickwheeler on November 11, 2019, 02:13:10 PM
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So when mine is cold fires up fine. But when hot it takes a few kicks. Let it cool down starts first kick. Makes me think I'm a bit rich on the pilot side. What is everyone's thought on this.
Thanks
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What carb you running Gene? My wife's R was doing that with the 38as & like you mentioned dropping the pilot one size fixed the problem.
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41.5 pwk Kevin. Just thought I would see if my thinking was correct
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My first thought would be that its lean when starting hot, and changing the pilot to a larger one would be needed, but maybe my thinking is off. Could it be fuel boiling in the float bowl ?
desertR
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I don't think it's fuel boiling this time of year here
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What carb you running Gene? My wife's R was doing that with the 38as & like you mentioned dropping the pilot one size fixed the problem.
So when mine is cold fires up fine. But when hot it takes a few kicks. Let it cool down starts first kick. Makes me think I'm a bit rich on the pilot side. What is everyone's thought on this.
Thanks
Sounds a little rich to me also.
Check the float level first then check your choke circuit to make sure the rubber on the end of your choke plunder is ok and that it seals on it's seat when the choke is off. If the choke circuit is not allowing any fuel to pass when hot, drop the pilot a couple of jet sizes and see if it helps the condition.
When we machine a PWK, the shroud that surrounds the needle has to be removed to machine the air flow passageway to 41.5mm. The special moulded o-ring that provides the seal between the shroud and carb body often does not reseal 100% because we cannot get new o-rings from Keihin. When this o-ring does not seal, the pilot jet can get fuel from the main jet circuit and vice a versa. This is another reason that I prefer not to bore the PWK series of carbs. I do not have a solution for you if this o-ring is your problem.
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Thanks for the replay Jerry. Just some info to you. Jets r us does sell the oring you are taking about. It escapes me at the moment what they call it
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It is called o-ring jet block.
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I've also heard of it referred to as a jet tower o-ring... I purchased a few from jets-r-us & they were a direct match to the oem keihin o-rings but a friend ordered some generic brand from another source & they were slightly thinner & none of them worked so only get them from jets-r-us.
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@hickwheeler What is your Air Screw set at ? Try turning it out a 1/2 turn :)