Stihl MS661C will not idle, help needed

[markds2]

I've got a customer's MS661C here and I simply can't get it to idle, it will come off revs and kick over a couple of times but then invariably die. In the absence of a LA screw, I'm a little stumped. I've checked the diaphragm and metering lever height, replaced the fuel filter and reset it numerous times but no joy. Cuts and runs beautifully at revs too. Yes, it does have the 4701a coil and Black solenoid.

The carb does have this little stop on the throttle, but the workshop manual says that you must NOT adjust it as it is set from the factory and will cause running problems. Has anyone else experienced this issue? any solutions out there? Any help would be hugely appreciated.

 

[Big_6]

Angelo

Sent from my SM-N975U using Tapatalk

 

[Redfin]

Will it idle without the air filter?

 

[markds2]

Will it idle without the air filter?

That I have not tried, Sir. I will do so at lunch

 

[dall]

Flooding ? If so it’s the solenoid

 

[markds2]

Flooding ? If so it’s the solenoid

After the air filter, that's the next thing to try...

 

[dall]

I’m saying when it is running
How long will it run ?

 

[markds2]

I’m saying when it is running
How long will it run ?

It will run as long as the tank as fuel in it - as long as I have my finger on the throttle. As soon as I try and let it idle it will die. Also, when starting it I have to use the 'Start' position even when it is hot. As you say, it could well be the solenoid, but, it does run perfectly otherwise.

 

[huskihl]

Put the newest white solenoid and orange fuel filter on it

 

[sawmikaze]

Put the newest white solenoid and orange fuel filter on it

Ding Ding.

 

[sawmikaze]

Flooding ? If so it’s the solenoid

Ding.

 

[Wood Doctor]

Did you test the compression? Engines with low compression don't idle worth a hoot, even though they may run at WOT.

 

[markds2]

Did you test the compression? Engines with low compression don't idle worth a hoot, even though they may run at WOT.

The saw has been completely gone through as the sparkplug thread had stripped. Its had a bgd, timing advance and muffler mod and pulls 165psi of compression.

 

[markds2]

Will it idle without the air filter?

No it will not....Solenoid and fuel filter upgrade coming up.

 

[markds2]

Ouch!

 

[dall]

Ouch!
View attachment 266440

lol its not your saw lol

 

[angelo c]

Ouch!
View attachment 266440

but its sooooo worth it when it runs properly....

 

[huskihl]

Ouch!
View attachment 266440

I think the solenoid alone is like $70 here. I paid $48 for the solenoid and filter kit.

 

[markds2]

I think the solenoid alone is like $70 here. I paid $48 for the solenoid and filter kit.

Do you have the code for the kit Kev?

 

[huskihl]

Ouch!
View attachment 266440

$83NZ i

Do you have the code for the kit Kev?

Ryan might @sawmikaze

I’ll check