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08-19-2014, 09:28 AM | #1 | |
Join Date: Apr 2006
Location: South Haven Michigan
Posts: 225
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Quote:
http://www.pencilgeek.org/2009/05/oc...nversions.html In regards to your valve to piston collision...I have seen this a few times in my Scooter parts/repair shop. It is caused by a stretched timing chain and or a weak or defective chain tensioner. What happens is that the chain jumps or slips a few teeth on the Cam or Crankshaft gear...this causes it to jump valve timing so that the valve is open as the piston comes up. What appears as pitting or melting of the piston is actually just scarring from the broken metal pieces being scattered around... Just my 2 cents... I only work on Scooters for a living..so I may be wrong... Glenn |
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11-25-2014, 11:08 AM | #2 |
Join Date: Jun 2014
Location: north woods of WI
Posts: 1
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carasdad. I Agree completely, timing chain tension should be checked and adjusted as a maintenance item.
Last edited by Flint; 11-25-2014 at 11:18 AM. Reason: too wordy the first time |
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