ms200t problem

[riggers]

hi all need some help my wee saw cuts out and wont idle I have tried al lthe usual idle speed ect spark plug checked the piston and that seems ok.

 

what I have noticed is an excess of fuel coming out of the exhaust mmm

 

any ideas many thanks paul.

[spudulike]

hi all need some help my wee saw cuts out and wont idle I have tried al lthe usual idle speed ect spark plug checked the piston and that seems ok.

 

what I have noticed is an excess of fuel coming out of the exhaust mmm

 

any ideas many thanks paul.

 

It sounds like it is flooding, it may be a leaking needle valve in the carb, it is possible the choke valve is sticking on, this usually makes the saw unable to rev out. It may be that the L screw on the carb just needs a simple adjustment.

 

Other than this, it could be a leaking welch plug or dodgy accelerator pump.

 

You did ask!

[riggers]

wow I did eh lol welch plug ?????? so are you saying the carbs fecked

[riggers]

it seems to rev up fine as soon as I decelerate it cuts out

[spudulike]

The carbs are fixable if you know what you are doing. I would start by tuning the carb - H&L screws and reset the idle. If the saw still plays up then look again.

[adw]

Oh dear all sounds a little familiar.

[spudulike]

Oh dear all sounds a little familiar.

 

Mmmm, it does doesn't it:001_rolleyes: It is rare that one of these carbs beats me and have a high rate of success with them:thumbup:

[riggers]

I have put the carb back to factory settings ie clockwise till stop then anti clockwise 1 full turn on the L and H as wel as the idol and itdid start better when I tried to adjust the idol I couldn't get it to stay on long enough so as to adjust it spud thanks for all your help you seem to be the man when it comes to these you mentioned welch plug

and a leaking needle valve how would I tell if this is so many thanks again

[spudulike]

I have put the carb back to factory settings ie clockwise till stop then anti clockwise 1 full turn on the L and H as wel as the idol and itdid start better when I tried to adjust the idol I couldn't get it to stay on long enough so as to adjust it spud thanks for all your help you seem to be the man when it comes to these you mentioned welch plug

and a leaking needle valve how would I tell if this is so many thanks again

 

It is not that common that a needle valve leaks and only said this as you said the saw was exiting neat fuel from the exhaust. I pressure check carbs but you can just buy a carb kit and fit a new needle but it is a bit of a job!

 

A leaking welch plug can cause issues, this is the oval aluminium plug next to the metering arm under the diaphragm, if the seal around it is red, leave it alone, if it is clear or has none, you could degrease it and then work a little superglue around the edge of it with a sharp object but don't leave too much glue as the petrol will degrade it. There is a way of checking it is sealing but I developed it for myself for my own use:sneaky2:

 

A faulty piston pump is the most common issue, it is a bitch to replace and would recommend no amateur gives it a go. There is a work around where the welch plug on the back of the carb is removed and the holes behind it sealed but this is also not without risks of filling the check valve with glue or having the sealant degrade to the point it leaks.

[riggers]

ok mate many thanks I think I may have to put it in and get a doc look at it shame your not closer or would have given it down to you I don't know if its something you would do ????? my local sthil dealer are a bit pricey