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
trickwarrior

99 WR400F Conversion

4 posts in this topic

Ok, First off I have read a lot bout this subject in here already. My questions is this. I 've a 99 wr400 that needs to have the crank, or at least a rod and bearings. I want to replace the entire rod and an wondering if I can just drop in a 426 crank. My jug has been resleaved and has room to be bored over to the 426 slug. Can I just buy a new crank for a 426 and drop it in there??? What others parts will I need to make it happen? Thanks in advance for any help and sorry for reposting this question.....

Share this post


Link to post
Share on other sites

The 426 crank is the same stroke as the 400. The increase is due to the larger bore. Best bet is to have your crank rebuilt with the 426 rod since you already have your cylinder bored to the 426 specs. This way you get the stronger 426 pin also.

1 person likes this

Share this post


Link to post
Share on other sites

By the time you pay for the press work and alignment, it's about a push cost-wise to rebuild your 400 crank with a new 426 rod kit or buy a 426 crank from the TT store. However, the earlier cranks used a woodruff key to keep the primary drive gear from spinning on the crankshaft, and the 426's (at least from 01 up) use a splined shaft, which means that you would need to buy a primary drive gear as well. Depending on how worn your gears are, it may also be a good idea to replace the primary driven gear (that's riveted to the clutch basket) as well. If it were me, I'd go for the new crank and primary drive gear from the TT store, and see how well it meshes with your old driven gear...it will prpbably be fine, and you get the piece of mind of having new parts.

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