Author Topic: Grooving the cylinder  (Read 882 times)

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Offline joe_indi

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Re: Grooving the cylinder
« Reply #10 on: March 21, 2015, 12:29:12 am »
looks like the motor was running very cold?  is the underside of the piston clean (cold) or carboned up?

is the coil ok?

......not the picture i was hoping to see.  bummer.
It seemed to be running hotter. Dry carbon on cylinder top and piston top. The user said it had no 'muscle' in deep cuts.The engine was just putting out smoke. The saw was  fine otherwise. With the new piston it runs well.
This grooved piston also was brand new.
One thing I recall is that idling the exhaust sound was very subdued, like what you get from a saw with poor compression. That is why I think those grooves that I cut might have been too big for this piston.
I look at this from another viewpoint, to lower compression on MS460 I add an extra cylinder gasket (0.3mm thick each) just that extra gasket changes the saw so much especially at idle and mid range.
That is why I think the grooves were too big.The saw lost too much of compression.

 

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