350 to 400 conversion
#1
07-13-2016, 08:03 PM
Join Date: Jul 2016
Posts: 11
Likes: 0
Received 0 Likes
on
0 Posts
350 to 400 conversion
Getting ready to make a yamaha 350 a 400. I already purchased a 2000 400 crankshaft and counterbalancer from a 400 (it was cheap and new), and a 2001 400 cylinder. I also bought the 400 timing chain as well. I cannot find a high compression (10.5:1) for a 400, but they make them for 350. In the wsm catalog 350/400 pistons are the same part number , but are stock /low compression. So I should be able to use the 350 hi compression piston in the 400? Remember, the 400 has a shorter rod to compensate for the increased stroke.
#2
07-15-2016, 07:06 AM
Getting ready to make a yamaha 350 a 400. I already purchased a 2000 400 crankshaft and counterbalancer from a 400 (it was cheap and new), and a 2001 400 cylinder. I also bought the 400 timing chain as well. I cannot find a high compression (10.5:1) for a 400, but they make them for 350. In the wsm catalog 350/400 pistons are the same part number , but are stock /low compression. So I should be able to use the 350 hi compression piston in the 400? Remember, the 400 has a shorter rod to compensate for the increased stroke.
I am going to be doing the same come winter. GL with the build and please post pics here and let us know how it goes.
Thread
Thread Starter
Forum
Replies
Last Post
Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)