192tc bogging off idle

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traded in the comp tester
same results!
so either
a: l can't use a compression tester
b: the one l got from the auto parts store won't work for saws
c: 2 bad ones in a row

did a pull cord comp test with bar and chain removed - no drop

frustrating
Same results on known good running saws or just the one in question?
 
Well thats just not working right. Is there an adapter on the screw in end to fit a different thread?
there are various adapters
the one I'm using seems right
(threads match the sparkplug - the o-ring compresses when l tighten it)

don't know what I could be doing wrong... this is not my first time checking compression (I'm a decent shade tree diesel mechanic)
confusing
frustrating
and l want to figure it out

but
l do have compression
because the saw runs!


l tested it today
and the fuel line swap appears to have fixed it
it starts easily, and revs up fine - no boging

thanks to everyone who helped

goat
 
Forget the compression tester and look for obvious flaws in parts. Sounds like the fuel line is the culprit.
yep
fuel line is at fault
and the saw is fixed

and 'sthiltech' thanks for the pull cord comp tests - very useful as a sanity check

just want to know what the story is with the comp tester l spent 35bucks on...

goat
 
there are various adapters
the one I'm using seems right
(threads match the sparkplug - the o-ring compresses when l tighten it)

don't know what I could be doing wrong... this is not my first time checking compression (I'm a decent shade tree diesel mechanic)
confusing
frustrating
and l want to figure it out

but
l do have compression
because the saw runs!


l tested it today
and the fuel line swap appears to have fixed it
it starts easily, and revs up fine - no boging

thanks to everyone who helped

goat
Adaapters do that get a testor without one. Thats why !
 
Adaapters do that get a testor without one. Thats why !
the "adapter" I'm using is attached to the tool (l posted a pic earlier in the thread)
not a separate screw on piece
(there are various screw on adapters in the kit too)
so l don't know...

but it does seem like l need to try a different tester

I'll try the one l have on a car and see if it works....

next time this come up I'll get a small engine specific one l guess

thanks
goat
 
A tester made for small engines typically have no "quick connects" in the hose... plus the hose length is kept short for accuracy. Plus the valves in the ends themselves are made for low pressure actuation.

View attachment 1039482 View attachment 1039483 View attachment 1039485
It's just as much about where the check valve it too. Needs to be at the tip of the adapter. My snap-on compression testers all have the check valve at the tip of each adapter, even the bigger diesel compression tester has check valves in the injector or glow plug adapters. The newer check valves are much easier to press in then the older ones too. I suspect there was a running update to stop using standard tire valve and get ones with light springs in them. (Just an assumption) the new ones have a whitish clear sealing ring on them instead of the red or black sealing ring like the older style/tire valve.
 
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