C1Q S186 KM55R

[PTmowerMech]

Looks like that carb has a purge bulb.
Be sure the fuel inlet side holds 7psi.
Then press and release the purge bulb. Pressure should drop slightly an hold each time you press bulb.
Apply 7 psi pressure to purge line barb. Should hold pressure. If those are good look for bad check valve or welch plug fallen out.

I need to do some research on check valves. I've never messed with them.

 

[Fish]

WOW.. Thanks man. I didn't get this site when I googled this. This is a great price.

That looks like the newer style carb, your throttle cable might not work. That is why I include the throttle cable with mine.

 

[Hammermechanicman]

I need to do some research on check valves. I've never messed with them.

Most check valves are not serviceable. You can usually check them with a piece of fuel line held on it and the use mouth to suck and blow. Should only work one way. If bad need new carb.

 

[Fish]

Does your old carb have ref. #7?

 

[Fish]

The carb in that ad shows a carb that takes the z-bend end.

 

[PTmowerMech]

I think I have the carburetor issue worked out. I got the new US cleaner in today, then reinstalled the kit. Everything seems to be pretty smooth. Except the idle is a tad rough.
The problem is now, just suddenly it'll die. Like you hit the switch. Sometimes, it'll start right back up. Sometimes it's several pulls. BUT, and here's the funny part, it won't just die, at WOT. At idle, it seems like a switch or coil problem. But seems like it wouldn't matter if it was WOT or not, if it was the switch or coil. Right?

I've had about all I can stand with this 2 cycle stuff.

 

[PTmowerMech]

Does your old carb have ref. #7?




View attachment 54260View attachment 54261

Yes, the wire groove with the bigger hole on one end.

 

[Fish]

Well, if the carb in the pic is what they are selling, it will not work.

 

[PTmowerMech]

The carb in that ad shows a carb that takes the z-bend end.
View attachment 54262

I went ahead and ordered one of these. The customer service guy says the arms are interchangeable. According to him, it's an easy thing to do. I've never tried it, though. He said the ones with the wire groove, you can't get anymore.

 

[bertsmobile1]

I wish Stens would stock that carb, It seems like that is the most popular part number for carb replacement on Stihl trimmers.

When chasing up service information & parts for a concrete saw, I emailed Walbro as I could not find even genuine Walbro parts for it.
The reply floored me.
Husqvarna paid for the developement of the carb so they owned the IP for it and even Walbro were not allowed to make the carb or any part for the carb without Husqvarna's approval .
So it is a new ( read very expensive ) carb only available through a dealer or nothing .
So Stihl probably have a similar deal with Zama considering they own 1/2 the Chinese factory that makes them