400ex jetting

[416ex_ba]

My freid has a yosh full exhaust and had a local dealer put it on and we had no idea what jet it had in it. So I took it out and checked it and it is stock a 148 they did not change the jet so I put a 155 in it for him I dont know if that is right yet but thier is noway that that 148 is the right jet right.

[Pappy]

155 should be close....to a few runs and pull the plug and check it

[tprender]

From what you wrote the dealer did what you told him to do. But, he should have said that it needed to be rejetted. That was bad on there part, more money to be made by them. The 155 is a good number to start with like Pappy said, but when you go in there change the pilot to a 42 to make it easier to start.

[ddfetters]

i have a yoshi comp system.....and run a 170M.....it's running very nicely......plug looks like it should