Stihl 044 gradually dies after WOT then idle

[reb78]

I rebuild my Stihl 044 a couple of years ago with a new piston and seals. Its runs brilliantly, loads of power and the speed of cut is amazing.

BUT there is a niggly problem. When its been run at full throttle on a cut and then put down as I adjust a log or move, I let it idle on the floor and it will gradually die and stall.

I set it up using a tacho after the rebuild so felt I got the H and L settings correct. It goes straight to full throttle from idle with no bogging at all. Adjusting the idle speed doesnt really help the problem, it just takes longer to stall.

All the lines and rubbers were good at the rebuild and the crank seals were replaced at the time too.

Any ideas?

 

[mtt.tr]

When you tilt the saw forward does it die quicker?


Have you tried spraying some easy starter around the crank seals?

 

[Kayos]

Tried bump starting it?

 

[pedrobedro]

Sounds like the metering might need adjustment, you might as well stick a carb kit in it while you are doing it

 

[reb78]

When you tilt the saw forward does it die quicker?


Have you tried spraying some easy starter around the crank seals?

No. Just tried and tilting doesnt seem to alter anything. I will try with some brake cleaner tomorrow around the crank.

Its a while back but I think I rebuilt the carb when I did the piston. I cant remember if I checked the metering, probably not but maybe!

I had a slight fiddle with the low fuelling screw and a very slight turn anticlockwise has improved it a bit so its not stalling most of the time at idle. Does that point to anything? Just fine adjustment?

 

[reb78]

Tried bump starting it?

No. Never occurred that you could! What will that tell me?

 

[8ob]

I had a slight fiddle with the low fuelling screw and a very slight turn anticlockwise has improved it a bit so its not stalling most of the time at idle. Does that point to anything? Just fine adjustment?

For carb set up I always crank up the idle a tad and adjust idle mixture to give highest rpm ,then turn it back a midgies dick and return the idle to a point the clutch wont turn the chain with the brake off.

Bob

 

[reb78]

For carb set up I always crank up the idle a tad and adjust idle mixture to give highest rpm ,then turn it back a midgies dick and return the idle to a point the clutch wont turn the chain with the brake off.

Bob

Thanls Bob. I will have another go tomorrow. I think thats what I did when I last set it up but I reckon my midgies dick was bigger than yours... and that may be the problem!

 

[Turbo]

If it was left sitting with E5 fuel in it there's a chance that some of the tiny passages in the carb have furred up. A carb strip & blow through the passages with carb cleaner & airline might help, an ultrasonic tank may help too.

 

[Migmac]

Are the filters clean?

 

[pedrobedro]

For carb set up I always crank up the idle a tad and adjust idle mixture to give highest rpm ,then turn it back a midgies dick and return the idle to a point the clutch wont turn the chain with the brake off.

Bob

That's my usual procedure, opening up the L screw slows the idle down but if you speed it up by weakening the mixture you can get a lag when going over to the H circuit