Some questions about fine tuning my chainsaw

[Little Jerrry]

I was hoping I could get some tips with regards to tuning / diagnosing a Stihl 031av I have ( I realise its difficult to do without having the saw in front of you).

Chainsaw has new everything except crank seals / cylinder (new rings), has electronic chip conversion with manually adjusting original flywheel. runs well but initial throttle response off idle isn't crisp

Questions I have:
- Chainsaw idles a bit higher cold and then drops back when warm (I dont have a tachometer but its noticeable) - could L jet be too rich and colder air is denser so leans out the saw a bit when cold?
- Bit of oil coming out the muffler - L jet too rich? Fuel is brand new 40:1. I'm still toying with the saw so I'm not cutting with it, just starting it and blipping it etc..if that makes a difference?
- Did electronic ignition conversion and manually moved the original flywheel...saw runs fine but is not super crisp off idle...no amount of my basic carb tuning skills can fix it....is this just potentially a timing issue with not having the electronic flywheel and just eyeballing the position of the original one.

Appreciate any help.

Adam

 

[alexcagle]

Make sure your impulse hose is plugged in to the crankcase, and see if the hose actually lines up with the carb nipple.
Also make sure your coil gap is at .010" clearance.
Try youtube for tuning a chainsaw.

 

[Vintage Engine Repairs]

1). All saws run differently cold then when warm. With a saw I’m repairing or servicing I’ll tune it after a minute or two after starting it up just to get me in the ball part and to know I’m at least safe to run it. Then, when it’s fully hot after a number of cuts, I’ll do the final tune which involves a tune then a cut then, then maybe a tweak, another cut etc until I’m happy.

2). That is called spooge. It’s unburnt mix, once it’s tuned and under load that should go away. If it doesn’t you’ll need to adjust your carb. Don’t let 2 strokes idle for long periods of time because it can happen.

3). Not enough info on what conversion, what parts you used, what your new timing is.

 

[Old2stroke]

If the timing is off, it's VERY difficult to get it right by eyeballing anything. Once you get into mods that might affect timing, you really need a timing light to determine if timing could be the problem.

 

[Vintage Engine Repairs]