Chainsaw - no power

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Originally Posted by 953

Running it on the rich side can foul the plug & decrease the exhaust port & produce more smoke, the saw wont be running at its most efficient & therefor lose a percentage of power.
But yes, this is preferable to running it on the lean side.
Correct me if Im wrong, but I was taught to (with the high speed adjustment whilst at full throttle.) turn it both ways until u can hear it going out of tune, then centre it, then slightly anticlockwise once more to just b4 the point where it starts 4 stroking again.
Cheers Dean.

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I have mine set so that they're four stroking lightly with no load and clean up during the cut.

Two reasons, I hate a two stroke screaming with no load and my saws have rev limiters which makes tuning with no-load a bit of a nonsense IMO.

The book says lean it off until it's hitting 13,500 and just starting to bounce off the limiter but a rev-limited coil makes it hard to pick the difference between the fours stroke and the rev cut so I tune them in timber, it's too easy to have them lean and bouncing off the limiter and you thinking it's still four stroking.
If the saw is modified at all you can't use that as a tuning point anymore anyway.

IMO with our eucs I reckon it pays to be a hair on the fat side considering the amount of time you can spend in the cut too.

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Originally Posted by tangus89

I would check the muffler. Had a similar thing happen a few times with our lawmaker mower. Mud wasps both times. Cleaned it out and worked fine.

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That's about the only the downside of removing the spark arrestor IMO.
Not sure on the legalities cutting on public land either, but my spark screens seem to disappear :angel:

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Originally Posted by uninformed

[snip]
and definitly use NON ethonal fuel, here we have BP's 98 octane stuff, no ethonal.

[snip]

do not leave fuel mix in the saw for extended periods

always run clean air filters

SHARP chain goes along way to saw life

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Interestingly I filled up in Scone today and the bowsers at the Shell listed the various petrol grades with the 91 unleaded (10% ethanol) stating "not for garden equipment"

Never noticed it before.

the ethanol blends i have heard will root the rubber hoses/diaframs and make some plastic fittings brittle how true this is i cant say haveing never tryed it

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Originally Posted by 460cixy

the ethanol blends i have heard will root the rubber hoses/diaframs and make some plastic fittings brittle how true this is i cant say haveing never tryed it

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According to the manufacturers a stock saw should be ok with up to 10% ethanol and the mix is used fairly promptly.

However, like Sergio I only use 98RON fuel just to ensure there is no possibility of any moisture absorption when sitting.

better late then never a few pics and vid of my 2100 husky im still keen to do a tutorial on basic tuneing if anyone wants to volintear to record it


https://www.aulro.com/afvb/images/im...11/06/1183.jpg

https://www.aulro.com/afvb/images/im...11/06/1184.jpg

YouTube - ‪husky 2100cd‬‏

It's important to check the crankcase seals on older 2 strokes . The crankcase is pressurised in order for the fuel mixture to be pushed up through the transfer port into the cylinder . They typically have seals each side of the crankshaft where it exits the crankcase. eg flywheel and starter . Over time , the seals leak and this affects performance greatly .

Mike

the seals go hard and leak also the gasket between the crank case half's leak also and if it has a Bakelite carb spacer they can crack as well but these problems are generally found on older machines that have been siting around un used

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Originally Posted by series1buff

It's important to check the crankcase seals on older 2 strokes . The crankcase is pressurised in order for the fuel mixture to be pushed up through the transfer port into the cylinder . They typically have seals each side of the crankshaft where it exits the crankcase. eg flywheel and starter . Over time , the seals leak and this affects performance greatly .

Mike

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More than greatly, it usually results in a seizure with piston smeared all over the cylinder.

Air leaks and two strokes are mortal enemies.