Site upgrade in progress... Core site functions are working, but some non-critical features/functions will be temporarily unavailable while we work to restore them over the next couple of weeks.

Please post any bugs you encounter, but before you do, check to see if it's already listed.

Thanks for your patience while we work to improve the community.

Sign in to follow this  
Followers 0

AP question (search disabled)

3 posts in this topic

so ive been researching a lot recently about the AP tuning for the YZ. almost all of the stuff ive read are for 2000ish-2004 bikes. ive got a 98 YZ400 and my FCR looks a lil different from my buddies 2000 426.

so the question ive got is, which mod should i start with to adjust the AP timing/duration/volume. the bike is totally stock. but has a pretty good bog. ive ridden it like this now for about a year and kinda just ended up learning how to ride with it.

when i rode my friends 426, obviously it already had been tuned cause theres no bog and its 10 times more fun to ride that way.

can anyone help me out who has maybe done it on theyre older (1998-1999) YZ?

thanks a bunch folks! :devil:

Share this post

Link to post
Share on other sites
as far as I know there is just the "Taffy" mod for the 400's


Quoted from the above posted link

"The purpose of the Taffy mod is to limit the duration of the coast enricher."

Just an FYI, as far as I know, the Taffy mod limits the duration of the accelerator pump stroke. The coast enricher is another name for the air cut valve (ACV), which richens the pilot circuit (WR's only) on decel (coasting) by cutting the air supply to the pilot in half. :devil:

Can't say what AP mods can be done on the 400, but without a leak jet, I think you are limited to duration mods (Taffy mod), pump diaphragms and possibly wiring the linkage.

Share this post

Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
Sign in to follow this  
Followers 0