Stihl 031av Carb Help

[Magic_Man]

Hey fellas, working on an antique here. Father has a Stihl 031av that was not running when it came to me with a Walbro WA-2C carb. I went through the saw, new rings (165 lbs compression), base gasket delete, new impulse line, new fuel line, fuel filter is good, cleaned and set the points, new capacitor/condenser, new plug, and rebuilt the carb with a Stihl kit. Pressure and Vac tested, everything checks out.

I have the saw where it will run now but won't take fuel. It will start right up on high idle and idle at low idle. It will not take throttle, it just bogs. Now if I feather the throttle and back the low screw way out (2 1/2 turns) it will rev and 4 stroke where it should at 1 1/8 turn out on the high screw. However as soon as I release the throttle at these settings it dies.

I checked pop off, it's a 27 pounds and reseat is in the 15-17 pound range.

Can somebody offer me some insight on this ? Possible metering adjustment ? Lever is set even with the circuit plate currently.

Thanks in Advance

 

[GPX433Todd]

No carb expert here, but I believe your pop-off is too high.

 

[Magic_Man]

No carb expert here, but I believe your pop-off is too high.

I thought so too.

I clipped a coil off the spring and brought pop off down to 20 pounds. Saw is now running but has an off idle hesitation. It won't maintain steady rpm at 1/4 throttle or less. Anything above that it is fine. If you stab the throttle from idle it hesitates for a second then takes right off.

 

[GPX433Todd]

Whereabouts are your H&L screws out from lightly seated?

 

[Magic_Man]

Whereabouts are your H&L screws out from lightly seated?

I will have to check when I go back to the shop it was late last night but I believe they ended up around 1 and 1.

 

[Mastermind]

Adjustable timing on that saw?

 

[Magic_Man]

Adjustable timing on that saw?

Points are adjustable, flywheel keyed like other saws.

 

[Mastermind]

Breaker plate not adjustable?

 

[Magic_Man]

Not certain, I will pull the flywheel later and take a pic. I know a little about points, but not a lot. Typically everything I have with points gets converted to electronic which may happen here. Lol

 

[Mastermind]

We need @Glock37

He knows these saws far better than I do.

 

[Glock37]

I see i was mentioned u rang
No breaker plate in 031 32 's

Points are likely good its the condensers that goes bad Also look at wire they short out from breakers and harden insulation. Also check switch

Post pic of flywheel and under fly need puller


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