Jetting help on GP 292 with 40 mm carb

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deepstroker

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Joined
Nov 24, 2003
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Installing 40 MM round slide on gp 292 mod , ported , milled gp head, GYT yamaha exspansion chamber pipe , need to know needle and seat I think a 1.5 -2.5 im not sure slide no. Im thinking 2.5, it has a 3 in it now tha carb was on a cycle, looking for the following sizes nozzle , pilot jet , and main jet and needle can some one get me in the ball park or tell me what there using with a 38 mm carb Im on the west so Im not racing against you
 
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The 292 engine Im putting the 40 round slide on is my porting I hope it works milled gp 292 head and I have a new old stock GYT exspanion chamber pipe just wanting a jetting set up to get me in the ball park and also need a clutching set up on a 102 comet Im new to the single cyl. performance sleds if you dont want everyone to see it PM me Im sure I wont ever race you guys more just for fun !
 
I run a 292 reed valve single, with gyt pipe and 38 mm mikuni. Main jet is a 500 for most weather, and pilot is a 35. I've only run this sled for 1 season, so it is not fully dialed in, but is very close. I cannot remember my needle, but I know that it is in a far up position to lean out the midrange for better pickup.
 
GP292Racer said:
I run a 292 reed valve single, with gyt pipe and 38 mm mikuni. Main jet is a 500 for most weather, and pilot is a 35. I've only run this sled for 1 season, so it is not fully dialed in, but is very close. I cannot remember my needle, but I know that it is in a far up position to lean out the midrange for better pickup.
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you mean the needle clip is in the far up position? if the needle it self was far up that would richen the midrange transition.
 
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