Saw with no guts

[waterworks]

I've got a well used Jonsered 2065 which I think lacks power, I gets bogged down even on 10 " diameter logs, and its only got a short bar on it, from what ive read this saw can take a much longer bar, and is a pro saw not a toy,  my question is what's the probable cause of losing power,  and how do I diagnose the problem, or get back to factory power levels ?

 

I've got a pressure / vacuum tester, bore gauges, and a spare clutch. 

[Echo]

Was this saw always like this, do you know its history.

Are you sure the barrel and piston are ok, the right plug, is it gapped right,

can you swap out the coil, is the coil gapped right.

How about the carb, is it old, may be needs a kit, a clean, or swapped out

for a known good one.

Did you do a compression test, or even hang it by the pull cord and see if 

the saw turns over because of low compression.

How is the muffler, clean screen, no screen, nothing blocking it like bent closed

deflectors.

I suppose start checking the things above which don't cost first.

Have you ever tried a different bar on it, just in case it is a deformed one,

gripping on the chain or the likes, is the chain good, was it ever thrown and

is kinked where it sits into the bar, that could put pressure on a saw and the

longer it runs the worse it would get if heat is building up.

Is the sprocket on the bar turning freely.

 

Just some ideas, either way I hope you sorted

Edited February 4, 2019 by Echo

[Stubby]

Low comp ?  Can't add much to the above really .

Edited February 4, 2019 by Stubby

[peatff]

Fuel metering or internal gauze filter blocked. Clean the carb out and check the diaphragm for holes or sagging as they do get baggy eventually.

[spudulike]

Probably low compression or the piston has nipped at some stage. If the saw is a tool that needs to pay its way, you may consider getting it serviced by someone who knows what they are up to. The 2065 should pull pretty well and is a pro saw.

In addition worth checking the fuel lines and fuel filter.

Edited February 4, 2019 by spudulike