Author Topic: min. compression?  (Read 249 times)

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Offline man of stihl

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Re: min. compression?
« Reply #10 on: March 07, 2015, 06:14:18 am »
I was working on a guys 272 Husqvarna. He tells me the coil is bad because when he runs it for a bit it just dies. So I listen to him and swap the coil, fire it back up and it runs but wants to stall. Its hard to re start. Difficult to keep running. I'm adjusting the carb and its way off where stock settings should be to keep it running.
So I decide to comp test it and the tester reads 100psi. I pulled the muffler and we have scoring on the piston.
New piston and ring installed, clean up cylinder, carb back to 1 full turn out on the H and L. Now she purrs like a kitten.
Lessons learned. Don't listen to the customer ;) and low compression saws are hard to tune and when they get warm, they drop more compression and go below the required comp to run.
Ron

 

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