Valves hitting piston - Honda TRX Forums: Honda TRX 450R Forum
 
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post #1 of 4 (permalink) Old 05-23-2019, 09:20 PM Thread Starter
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Valves hitting piston

Alright guys. 2008er Brand new build just put back in the frame. Using stock bore 12.5:1 cp piston, hc3, RE head with +1 intake and exhaust valves. I’m using a 04-05 cam tower with sprocket and when I time it up and tighten the timing chain tensioner it moves the alignment mark on the sprocket away from the alignment marks on the cam tower. Turn the engine over almost a whole revolution and it hits the valves. Intakes I think. Will this cam/tower/sprocket work with my engine? It’s working me to death
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post #2 of 4 (permalink) Old 05-23-2019, 10:07 PM
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The tower is fine since they are all the same, but you can't run an '04/05 sprocket on an 06+. You need the '06/07 cam gear.

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post #3 of 4 (permalink) Old 05-23-2019, 10:19 PM
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You need to use a 06-07 ER 36t or 06-09 R 36t sprocket. Not the 04-05 34t sprocket.
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post #4 of 4 (permalink) Old 05-24-2019, 04:58 AM Thread Starter
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Thanks so much!! I looked up the part numbers for the sprockets and sure enough they are different. I thought I had a serious piston/valve problem. Thanks guys!!!
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