Pipe Trouble

[Honzie]

I recently bought and installed a FMF Fatty pipe for my KX 125, now the bike climbs terrible. It seems to go straight from low end to crazy high revs. What should I do? I also have a Powercore 2 on the bike too.

 

[RM85rider123]

get a jetting kit, and jet it accordingly. Also make sure simple maintaince things are taken care of.

 

[Patman]

Why did you choose the Fatty & Powercore II?

 

[mas2de]

The pipes affect the powerband of 2 strokes alot. I believe the Fatty is for more top end. The Gnarly is for bottom end and mid range and kind of drops off at the top and is thicker gauge for running into bushes and falling and things. These would affect a smaller bike like a 125 alot. Are the Fatty and Powercore II supposed to be used together? Ask FMF for the jetting and carb settings for your bike with your pipe too. Like RM85rider123 says. That might help alot too.

 

[spark250]

fmf has some jetting recommendations on their website