Sithl ms200t carb tuning

[Proe]

Hi i was wondering if someone could help me out, i have a rebuilt ms200t it was working well after it got broke in. Can someone tell me how to tune the carb without a tacho, iv had a look online but everything seems to be different.

 

At the moment the saw runs but will not idle, iv been messing about with it and made it worse. I put the l screw fully clockwise then a full turn back anticlockwise and put the h screw fully anticlockwise. Not sure where to put the LA screw as the range of adjustment on it is huge.

 

 

Cheers

[spudulike]

Hi i was wondering if someone could help me out, i have a rebuilt ms200t it was working well after it got broke in. Can someone tell me how to tune the carb without a tacho, iv had a look online but everything seems to be different.

 

At the moment the saw runs but will not idle, iv been messing about with it and made it worse. I put the l screw fully clockwise then a full turn back anticlockwise and put the h screw fully anticlockwise. Not sure where to put the LA screw as the range of adjustment on it is huge.

 

 

Cheers

 

I am taking it that the H screw still has a limit cap on it??? If so fully anti clockwise is fine to start from - without the limit cap, the screw would come right the way out:blushing:

 

So - with the H screw fully anti clockwise and the L screw one turn out from fully in, you should start the saw and then adjust the idle so it idles well without the chain spinning - clockwise speeds it up, anticlockwise slows it down.

 

This is a good start point and once it is idling well, I usually fine tune it but on 1 turn out, you should be close enough.

 

The saw can be revved flat out and if it sounds too slow and flubby on the top end, turn the H screw in but don't let the saw scream otherwise you risk seizing it!

 

See how this goes - with the limiter in place, you shouldn't do too much harm.

[Proe]

Cheers, yeah the cap is still on it. Where should the LA screw be? Its pretty much impossible to adjust the idle if the saw wont idle though. Really not sure whats happened to it as it was running really well and idling pretty well now it wont idle at all. has new fuel lines in it.

[spudulike]

Cheers, yeah the cap is still on it. Where should the LA screw be? Its pretty much impossible to adjust the idle if the saw wont idle though. Really not sure whats happened to it as it was running really well and idling pretty well now it wont idle at all. has new fuel lines in it.

 

There is no set position but a very rough guide would be circa 2 &1/2 turns out from fully in.

 

If fully in, the saw should race on a fast idle. If it isn't doing this then you have some issues. If you start the saw on the fast idle setting on the choke lever (the setting used after initially making the saw fire using the choke), does the saw race and the chain spin up?

 

Once the saw is started, generally it is a case of feathering the throttle until the idle has been more or less dialled in.