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new 650/700+ build

silverbullet

By silverbullet
in Joyner UTV SxS Forum

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silverbullet Experienced

silverbullet

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Good Afternoon Fellow UTV Board Members,

We have been tinkering with the idea of seeing just how far we could take the 650cc engine bore and see what displacement we could end up with. So started with the stock 75mm bore and started to open it up from there. After careful measuring, and triple checking everything we decided to pull the trigger on a 77mm bore to see about the longevity of the engine and to see if we will be able to take it out further. It so far has survived a slightly hellish test phase where I had one of the guys take it out and run the crap out of it. He says (butt dyno) he can feel a bump in the torque and the shift points were a little different, but that could be due to the fresh rebuild. He said that the next step would be the intake and exhaust sides of the engine. So next step will be porting the head, and building a better exhaust ;)

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