Those don't exist. I've seen where people have been sticking those Lifan engines in them, don't know how well it works. I actually have one of the Lifan engines in my YSR. It was in it when I bout the bike. Not sure how strong it is yet. I have been battling a few carb issues. I have some new jets ordered so we will see.
yeap... just lookie at all the options! Costs as much as an I4 or more!!! :wow: http://www.mx-performance.com/id53.html
No doubt there. As retarded as it is, I'd love to build one of the DOHC heads. No good reason but just because
BBR can make a 4 banger scream. So can a few other people. Forget the carbs and pistons, get that stock head to someone that knows what they are doing or buy an aftermarket head. Make sure you get a good pipe also. Pro Circuit has a sweet one..... or do like I did...... ride a stock one and buy a Husky 630 SM....