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MX, SX & Off-Road Discussions
Dirt Bike Mods & Maintenance
Letter to Eric, Re: Top End
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[QUOTE="RM_guy, post: 230709, member: 20652"] 122 psi is definitely too low. You will notice more power after the new top end especially more low end. Eric’s std port job will give you a smoother powerband and adjust the compression to match the race gas that you are using. Part of the porting is grinding the exhaust valve to match the port shape. He gives them a good cleaning while he’s at it. He will need the cylinder (with the PV in it) and the head. The big bore job includes the porting, piston, rings and case mods (if you need them, I’m not sure if the YZ has enough clearance or not). I’m also not sure about gaskets. The std porting doesn’t include them but he can get them for you. It’s up to you on the big bore kit. I know a lot of members have gotten it and enjoy the extra power. I’m sure there will be more opinions. Good luck [/QUOTE]
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MX, SX & Off-Road Discussions
Dirt Bike Mods & Maintenance
Letter to Eric, Re: Top End
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