300ex Problems

[skatrdude20]

Aright. I got a shop at my house and my buddy jus traded his RM80 for a 1998 300ex. Its got NO bottom end and bogs on the top. The kid before him put a FMF Megamax hunkajunk pipe on it and he wants me to clean his carb and jet it. Whats the jet Specs. for this pipe...Everything else is stock and I`m making him buy a K&N filter....

[300exOH]

I would start with a 40 pilot and 128 (Kiehen-sp?) main and the needle in the stock position and go from there but it depends on your elevation.

[smr]

Originally posted by skatrdude20
Aright. I got a shop at my house and my buddy jus traded his RM80 for a 1998 300ex. Its got NO bottom end and bogs on the top. The kid before him put a FMF Megamax hunkajunk pipe on it and he wants me to clean his carb and jet it. Whats the jet Specs. for this pipe...Everything else is stock and I`m making him buy a K&N filter....

The first thing you need to do is check the timing. Sounds like it may have jumped time. Then I would tell your friend to save his money and buy a UNI filter instead of a K&N. K&N is good for power but they are no good at keeping dirt out. They are fine for road bikes and cars but I will never use one offroad again.

stock jetting is 125 main and i think 38 pilot