Honda ATV Forum banner

1 - 6 of 6 Posts

·
Premium Member
Joined
·
7,533 Posts
Discussion Starter #1
What is a good jet size to go up to on a 300 fourtrax 1990 mod and a 400ex 2000 model both K&N air filters. I had bigger jets in my 400 but when I rebuilt the carb I forgot to get bigger jets and the ones I had are missing.
 

·
Super Moderator
Joined
·
18,227 Posts
Well my friend's 400ex I believe has a 170 jet as far as the 300 I would say somewhere around 128 to 130.
 

·
Premium Member
Joined
·
7,533 Posts
Discussion Starter #5
Im making a custom air snorkel/intake/heat shield/quick release filter/cold air extension system thats close to completion.

The problem I have is with the filter. I need a flat one but smaller then the bmw stock filter. So does it matter if I buy any k&n filter to use regardless of size or shape? Thanks
What are you working on???
 

·
Premium Member
Joined
·
6,616 Posts
The size of the part that clamps on is the main thing. You need a nice tight seal, and whether or not it fits in your airbox. you can always adjust air/fuel ratio to compensate for a smaller filter.
 
1 - 6 of 6 Posts
Top