Scavenge pattern discussion

mweba

Well-Known Member
Jan 10, 2012
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Efficient clean charge and burn is the goal. Lets see some patterns and and suggestions.

Have last years build off saw down for the first time (350). I have uniform wash on the intake side and the chamber looks good with the exception of unburnt charge center intake side.

This is a 353 cylinder so the trans are flat as I could get....What would you guys try to get a more complete burn?


Untitled by mweba1, on Flickr
 
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mweba

Well-Known Member
Jan 10, 2012
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Iowa
Pattern looks uniform, Joey. Ports look close to stock and so does the wash. What oil are you using...or did that saw have 100's of hours on it?
 

stihlbro

Active Member
Jan 10, 2012
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Ports untouched. Squish set. Small pop up. Lower transfer slightly matched. Oil was probably stihl orange bottle. Been a couple years back.
 

srcarr52

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Feb 11, 2013
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Index you spark plug, you can see the ground electrode in you burn pattern. A little carbon spot under the spark plug is really unavoidable.
 
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