KMB
Addicted to ArboristSite
Easy on me fellas…
I made this adapter and was trying it out on a Stihl FS80 string trimmer (no impulse hose) that I just got back to working on FS80 troubleshoot. Something is not right. With the exhaust and intake blocked on the FS80, it wouldn’t hold vacuum or pressure at all.
I thought I’d try it on the 260 (exhaust, intake, impulse blocked off), and it would hold some vacuum (didn’t try pressure). I then tried putting the spark plug back in and applying air through the impulse hose (like I usually do) and it held vacuum like it should.
The spark plug used to make the adapter is a Champion lawnmower plug. I used JB Weld to hold the hose barb fitting in place. I held my thumb over the opening and applied vacuum to the adapter and it held the vacuum. The adapter threads into the cylinder(s) fine, and I tighten it down securely.
Now I realize that the problem I’m having with this FS80 could be blown crank seals (as Fish and THALL have mentioned in the linked thread), but the fact that it’s not working on my saw (as I have described) doesn’t seem right. So here comes the ‘dumb’ question…does the piston have to be at a certain place in the cylinder to use the spark plug hole to apply the air vacuum or pressure? Or is there something else I’ve missed using this method?
Kevin