Bought a 400ex carb now what?

[330EXman]

i bought a 400ex carb for my 300 and i have all the mods listed below except the CAM,VALVE SPRINGS,PISTON,CLUTCHKIT ARENT INSTALLED YET.
can anyone tell me what to jet the carb to. WITHOUT THE PARTS ABOVE, AND THEN ANOTHER JET SIZE FOR WHEN THEY GET INSTALLED.
anyone who can help me would be a great help.

thanks:rolleyes:

[400exJOE]

I think it would really be a game of guess and check. Because it is a 330 and not a 400, I would start by lowering the main jet to, um...around 130? Again, get a feel for where it will run and them fine tune from there. With the cam, your main jet will probably increase by 5 or 10.

[R-Crazy]

did you have to buy a new air boot and if you did, from what?

dave

[Sandragggen]

I UNDERSTAND YOUR FRUSTRATION!!!! ALL MOTORS ARE DIFFERENT!!!! ANYTHING ANYONE TELLS YOU WILL BE A GUESS!!!!

ok, find out stock 300 main jet num. Pretend it is a 120, buy 120 - 160, or sumthin like that, and test,

[330EXman]

i bought the carb and it comes with K+N dyno jet kit. also all you have to do to hook it up is purchase a bigger clamp a hose clamp does the trick real good. so ones i get it on i will start at 140 i think thats what Sparks told me to try first on my modde motor. also i might have to try at 130 i guess till i get the modds installed

Jay

[300exPA]

I just had a 300 kit installed and a 400ex carb and the K&N jet kit (It was already installed). I ahd to go with a 350x carb boot. The carb makes the hugest difference. Im not sure of the jet size, it was already installed.