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General Minitrail Talk
Modifications
Sticking a Honda Hot Cam (or DRATV Mini Monster Cam) in a stock 3-speed CT70
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<blockquote data-quote="69ST" data-source="post: 150037" data-attributes="member: 5"><p>With the compression readings you posted, I wouldn't touch the valves unless the intake port is turning/turned black. I am under the impression that this engine is in tip-top shape and with low mileage. If you're going to pull the head and replace the rockers, don't be a piker...replace the cam chain, roller (inside the cylinder tunnel), idler & tensioner piston cap while you're at it. If the rockers have visible wear the rest of the timing chain assembly will be worn, too.</p><p></p><p>If it's time for a valve job, it's probably time for new valves, too. It's pretty rare to find valves with contact bands that aren't worn across the entire valve face, top-to-bottom. Just doesn't sound to me like you have a valve problem, at this time.</p><p></p><p>Valve guides rarely wear out in these motors. Replacing them requires a special driver and guide reamer.</p></blockquote><p></p>
[QUOTE="69ST, post: 150037, member: 5"] With the compression readings you posted, I wouldn't touch the valves unless the intake port is turning/turned black. I am under the impression that this engine is in tip-top shape and with low mileage. If you're going to pull the head and replace the rockers, don't be a piker...replace the cam chain, roller (inside the cylinder tunnel), idler & tensioner piston cap while you're at it. If the rockers have visible wear the rest of the timing chain assembly will be worn, too. If it's time for a valve job, it's probably time for new valves, too. It's pretty rare to find valves with contact bands that aren't worn across the entire valve face, top-to-bottom. Just doesn't sound to me like you have a valve problem, at this time. Valve guides rarely wear out in these motors. Replacing them requires a special driver and guide reamer. [/QUOTE]
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General Minitrail Talk
Modifications
Sticking a Honda Hot Cam (or DRATV Mini Monster Cam) in a stock 3-speed CT70
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