SteveSr
Addicted to ArboristSite
I don't know if I would go so far as calling it a "governor". It is more of an over-speed protection device to protect the engine from spontaneous high-speed disassembly when run wide open without load.
Huh, thought I had it fixed!
- Thread starter Bret4207
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I agree. It's the manufacturer that decided to mislabel this crappy little device.
SteveSr
Addicted to ArboristSite
This was the way to protect engines from over-speed before the EPA and limited coils came along. Just imagine the un-burned hydrocarbons one of these machines would produce!
Thanks Ray. That #19 has been a problem on several carbs I rebuilt, even these HDC`s I am working on currently.
Bret4207
ArboristSite Guru
I like unburned hydro carbons!
Did you ever get your fuel delivery issues figured out?
Bret4207
ArboristSite Guru
Trying to get the furnace hooked up out in the garage. Been too cold to do any fine motor skill work with my arthritic hands.
Bret4207
ArboristSite Guru
Update- Finally had a chance to pull the carb and look at the "governor". I couldn't determine if it was faulty or not, but it seemed a likely culprit in the issues I was seeing. Ended up using some of the yellow gas line teflon tape to block the inlet to the gov (2 pin holes in the cut on the mechanisms sides) and the outlet to the carb throat. Just doing that resulted in a completely different tune to the saw with no other changes, so I'm sure it had issues. It's still an old beat up, worn saw, but now it idles good and I've got the hi side of the carb set so it will do some cutting. Thanks for all the help!
Wondered about your fix on that saw, description pointed to an air leak.
Did you also pressure & vac test it?
Common for the crank seals & that big case o-ring to leak at the old age of these saws.
Did you also pressure & vac test it?
Common for the crank seals & that big case o-ring to leak at the old age of these saws.
Always good to disable those devices. They have no business being labelled as a governor, at best they are an unreliable form of rev limiting.
SteveSr
Addicted to ArboristSite
Yes, but they can prevent a blown engine from over-revving. This was their intended function. These can usually be fixed and made to function again. I will go to the effort if the carb is NLA (almost guaranteed) or the RPMs aren't limited by the coil.
Bret4207
ArboristSite Guru
Not yet. It shows no signs of a leak at this time. I'll try to give it some run time in wood and see if issues crop up. Thanks for the reminder though. Seals do dry out and wear.
They could be made to function but due to design, I bet they would be difficult to calibrate and the set point would vary a huge amount from one saw to the other. I would sooner trust a trained ear and finger on the throttle to prevent over-revving.
SteveSr
Addicted to ArboristSite
Well, since I am not the end user most of the time I don't like to be the one providing the "loaded gun" or the "live hand grenade"... and then having to deal with the aftermath.
Yep, I understand that. Only point I'm trying to make is MANY saws have no form of rev limiting and I would sooner have one of those than a saw with rev limiting that has questionable reliability.
We started using the little XXV's for climbing saws when they first came out, great little saws. I got this one last year, it's one of my favorites now. I'm supposed to go get another one Sat, then head down to my friends camp fire for a couple beers. His land lord just turned 90 and I missed the party. He wants to give me a gift for helping him take down a couple ash trees last year. I've never owned a Sachs. He said he bought this one back in the 70's, used it for one project, and it's been sitting under his work bench ever since. It's a KMS4. Sure hope to post some pics of it next week.
