Stihl cobi problem

[Mark Bolam]

I have a Stihl combi system running a hedgecutter sometimes with the 1m extension bar. I went for the KM 130 R engine, which is a 4-mix.

 

Used twice this year, no problems.

 

Today though, it kept cutting out, backfiring and generally sounding really rough. Same batch of fuel used in half a dozen different machines today, and they were all fine.

 

Any ideas?

[Johny Walker]

dodgey plug ? loose wire ?

[combined tree services]

sounds like the coil pack to me but may well be the spark like Mr Woodpicker said

[Stephen Blair]

i bought the 4mix pole pruner last year mark, runs like a bust couch, really slow on the uptake, never broke down but just not as good as the 2 stroke version.

[Mark Bolam]

i bought the 4mix pole pruner last year mark, runs like a bust couch, really slow on the uptake, never broke down but just not as good as the 2 stroke version.

 

Thats what I don't get. Has run great since arb-fair last year. Admit the 4-mix engine sounds like a farting motorbike! Until today.

 

Will have a go at it tomorrow as local dealer down here didn't know what the correct file size was for a 3/8" pitch chain, so I don't trust them to diagnose the problem, fix it and charge me less than 2 weeks labour.

[Stephen Blair]

Thats what I don't get. Has run great since arb-fair last year. Admit the 4-mix engine sounds like a farting motorbike! Until today.

 

local dealer down here didn't know what the correct file size was for a 3/8" pitch chain

 

5.2mm:confused1:

[Mesterh]

5.2mm:confused1:

 

5/32 or 7/32

[Jonesie]

Mark it sounds electrical check the on/off cable at the throttle end, if you have no luck my guys will sort it for you.

[treediver]

I got a HL100 4mix which never use to want to start and was really slugish on the uptake and use to cut out alot. I put it down to the all in one air filter which seemed to be really restrictive. so i changed it with some less retrictive foam and its no where near as bad.

[Mark Bolam]

Thanks fellas.

 

Apologies for shet speling in thread title.

 

If I can't sort it Justin I'll get my mate to drop it in next week. Cheers.