stihl 660 starting problems

[Rob Stringer]

hello all, was doing some milling earlier this week with my stihl 660 chainsaw. Was running ok until the afternoon when it wouldnt start (like it had flooded), tried taking plug out and drying it etc. but still wouldnt start so packed up. Went out the next day and the same thing happened (ran alright in the morning then wouldnt start). Took it out a couple of days later and it fires on full choke then nothing on half-choke. Any ideas what the problem could be? Thanks, Rob S

[Stubby]

hello all, was doing some milling earlier this week with my stihl 660 chainsaw. Was running ok until the afternoon when it wouldnt start (like it had flooded), tried taking plug out and drying it etc. but still wouldnt start so packed up. Went out the next day and the same thing happened (ran alright in the morning then wouldnt start). Took it out a couple of days later and it fires on full choke then nothing on half-choke. Any ideas what the problem could be? Thanks, Rob S

 

Dirt in the carb .

[spudulike]

I usually check the compression is OK and then check the carb out. The gauze filter in the carb is the common one to get bunged up. The saw may just need a bit of love and attention if it hasn't been serviced lately!

 

Most issues are fuel related, then compression then spark/ignition but it is one thing stating them and another finding them!

[Rob Stringer]

Thanks for the replies, guess I need to check it over..

[skc101fc]

My 066 does this same scenario, but at all times. The stop/choke control rod is worn and doesn't operate the half throttle position properly. With a bit of jiggling I can get it to almost work, but I usually end up applying the chain brake, resting my knee on the top cover to restrain the saw, and squeezing the trigger whilst pullin the starter.

I must invest in a new control rod one day !!!

 

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[peatff]

My 066 does this same scenario, but at all times. The stop/choke control rod is worn and doesn't operate the half throttle position properly. With a bit of jiggling I can get it to almost work, but I usually end up applying the chain brake, resting my knee on the top cover to restrain the saw, and squeezing the trigger whilst pulling the starter.

I must invest in a new control rod one day !!!

 

I got that with my 036 and a new choke lever made no difference, thinking it might be a worn out trigger. If the saw is running and I push the choke lever down it speeds up but it will not lock there.

[spudulike]

It was common on early 064s and 066s for the fast idle cam on the choke rod to break off making starting almost impossible. It was usually caused by people pushing the choke lever down too far and hard and then forcing the lever back up without opening the throttle fully.

 

Not seen it on any 660s though!