Jetting help on GP 292 with 40 mm carb

D

deepstroker

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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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2.5 NEEDLE IS LEANER THAN A 1.5. THE REST OF THOSE NUMBERS I WOULD HAVE TOO LOOK UP. YOU WANT STOCK SPEC. 3:16 (yammie tony)
 
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.
Click to expand...


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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