Homelite 410 no power

[nickskipa]

Hi All

I’ve bought a Homelite 410, it started and ran but died as soon as the chain touched a log, it would not rev very high regardless of the hi speed carb setting. The compression was 50psi.

I took the barrel off and both the piston and bore were damaged, I’ve bought a new barrel and new rings, fitted them with a new base gasket , it starts and runs but again has exactly the same symptoms, I did another compression test and it’s 60psi, it ticks over fine but climbs relatively slowly to its rather low max rpm, I’ve tried adjusting the carb but still no power, it does not sound like it’s running lean/sucking in air.
Would the crank case seals cause this or the piston as it’s not new but the rings are ?
It certainly feels like it has good compression when I pull the cord but I’m at a loss, any thoughts would be very appreciated.

Regards
Nick

[rarefish383]

Nick, one of the guys that know a lot more than me will be along shortly. But, I've never been able to get a saw to run under about 100 PSI.

[sweepleader]

I would agree that it should not run with 60 psi, I would suspect you have a problem with your tester.

You likely also have another problem in the saw but it is pretty hard to tell from here. Is the spark good? Can you pressure test the carb and the engine for leaks? Are the fuel filter and fuel line in good shape?

There are many places on a saw that can cause trouble.

[rarefish383]

The seals can suck air. I think it’s when you turn the saw on its side and it begins to race, that’s a sign of leaking seals. The rings are what really seal. I’ve known guys to use less than perfect pistons on collectible saws where new ones are not available. They would run fine for occasional fun use, maybe not day in day out commercial use. Where are you located?