HEADS UP!!!

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
dewercs

question for gray racer about shims

4 posts in this topic

i need to buy a shim kit.

1. What manufactuer do you recomend?

2. What size for a yz450f?

3. What size for a yz250f?

Thanks in advance Gray, and disregaurd the PM

Charlie :crazy:

Share this post


Link to post
Share on other sites
i need to buy a shim kit.

1. What manufactuer do you recomend?

2. What size for a yz450f?

3. What size for a yz250f?

Thanks in advance 642MX, and disregaurd the PM

Charlie :crazy:

1. Hot Cams

2. 9.48mm

3. 7.48mm

I fixed your post too. :D

Share this post


Link to post
Share on other sites

Here's my problem with shim kits.

The big Hot Cams kit has 3 of each size from about 120 to 310 or something for $90. In the first place, you'll never be able to use those shims that are 200 or larger in a YZF of any size. If you shim down to a size more than 3 steps smaller than the original shim, you're begging to drop a valve, so this eliminates the usability of any shim smaller than about 160 or so, all of which means that 2/3 of the kit is useless. This will be especially annoying if you need 4 of the same shim.

Now, you can get "refill" packs that have 5 each of a smaller number of sizes for $35 or so. But since YZ250F's are mostly built with shims in the 175-190 range, and the refill kits split at 180, you'd need two kits.

For a 450, you may never need to shim the valves, anyway. IMO, you should just go to a Honda shop and get the shims you need (they'll almost certainly have them) and leave it at that.

Like the man said, 7.48 diameter for the 250F, 9.48 for the 450.

Share this post


Link to post
Share on other sites

As usual, Gray is spot on. If you need to re-shim, just measure, calculate (or use the table in the book) and buy the ones you need. I usually buy 1 up and 1 down from what I think I need, and they end up collecting dust in the toolbox. Many dealers will even swap shims with you if you are a regular customer...

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