Keihin Carb

[hfthe3rd]

I just installed a 42mm Keihin Racing carb on my 750 sx and im having issues tuning it because it always seems to be running rich and when i go to low with the screws (low & top) it runs terrible , i go to high runs terrible. If i stay close to 1 it slowly accelerates and goes about 20mph. I believe i need different jets but if i do what size would i need?

 

[cattledog]

what size is the stock jet just use that the info is in the shop manual that you downloaded, i hope it is the carb henry i will bring my tester it still could be one of the coils in the stator i will check on weekened for you and will bring spare carb

 

[hfthe3rd]

what size is the stock jet just use that the info is in the shop manual that you downloaded, i hope it is the carb henry i will bring my tester it still could be one of the coils in the stator i will check on weekened for you and will bring spare carb

im lookin at the manual now to figure it out, im hoping to get this ski running by friday !

 

[hfthe3rd]

the stock jet on the manual says

Main jet #140, JS750-A3~: #145
Pilot Jet #75


idk what that would mean exactly .
On the 42mm carb on it now , the low end jet is an 83

 

[tbaer]

pm jjc568 he runs the same carb on his 750 i think. he is always messing with his carb. You should buy the adapter for you mani and run a mikuni they are easier to tune.

 

[hfthe3rd]

pm jjc568 he runs the same carb on his 750 i think. he is always messing with his carb. You should buy the adapter for you mani and run a mikuni they are easier to tune.

I always keep getting that lol

 

[Waternut]

Don't listen to all the hype. Keihin's are awesome carbs. They produce the same or better power with a smaller throat and use WAY less fuel. The problem is they are harder to tune and a 1/4 turn can be the difference between piss poor and perfect.

 

[hfthe3rd]

Tomm im going to take the stock jets i had in my stock carb and switch them to the 42mm carb to see if that will solve any problems

 

[cattledog]

Don't listen to all the hype. Keihin's are awesome carbs. They produce the same or better power with a smaller throat and use WAY less fuel. The problem is they are harder to tune and a 1/4 turn can be the difference between piss poor and perfect.

yes to all of above