Jump to content
Sign in to follow this  

YZ450F compression?

Recommended Posts

You are right about 12.5:1 for the 2004 model. Yamaha lowered it to 12.3:1 for 2006 and 2007.

Share this post


Link to post
Share on other sites

my buddy has a 06 and my 04 hands it the 06 its ass everytime we race.

Share this post


Link to post
Share on other sites

So his is completely stock, and you drag race, right? :applause: That won't work with my '06.

Try this: ride his bike for 15 minutes, then roll off 3 timed laps. Then compare that with your best three on yours.

Share this post


Link to post
Share on other sites

See I had an '04 and my '06 at the same time and the '04 seemed weak compared to my '06 when jumping off one to the other.

Share this post


Link to post
Share on other sites

Yea my buddy has an 06 and it hawls ass he ends up always faster than my 04 must be the 5 speed :applause::lol:

Share this post


Link to post
Share on other sites

You heard wrong. The drop in compression was the byproduct of changes made to the combustion chamber to improve the head. A 0.2:1 drop in compression is inconsequential.

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

Reply with:

Sign in to follow this  

×