Author Topic: Dolmar 7900 Porting Info  (Read 8625 times)

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Offline srcarr52

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Re: Dolmar 7900 Porting Info
« Reply #160 on: July 07, 2014, 02:40:41 pm »
Thanks for measuring your Tim.  After studying a few old stihl work Saw pistons last night I think the carbon pattern on the top of the piston indicates a pretty thorough burn that cools down towards the exhaust side. This is a good thing that the offset chamber contributes to. 

Generally the burnt locations are the hotter areas.  You'll have clean spots where the fresh a/f charge from the transfers cools and cleans the piston.

 

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