ArboristSite.com Sponsors


Huh, thought I had it fixed!

Old2stroke

Old2stroke

Never too many toys
Joined
Jan 24, 2016
Messages
814
Location
Ottawa, Canada
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.
I agree. It's the manufacturer that decided to mislabel this crappy little device.
 
ray benson

ray benson

Tree Freak
Joined
Sep 11, 2002
Messages
27,260
Location
Indiana
Bret4207

Bret4207

ArboristSite Guru
Joined
Feb 3, 2006
Messages
626
Location
St Lawrence Valley, NY
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!
 
hotshot

hotshot

ArboristSite Operative
Joined
Apr 11, 2009
Messages
2,717
Location
Midwest
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.
 
SteveSr

SteveSr

Addicted to ArboristSite
Joined
Mar 3, 2003
Messages
2,020
Location
Raleigh, NC
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.
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
Joined
Feb 3, 2006
Messages
626
Location
St Lawrence Valley, NY
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.
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.
 
Old2stroke

Old2stroke

Never too many toys
Joined
Jan 24, 2016
Messages
814
Location
Ottawa, Canada
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.
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
Joined
Mar 3, 2003
Messages
2,020
Location
Raleigh, NC
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.
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.
 
Old2stroke

Old2stroke

Never too many toys
Joined
Jan 24, 2016
Messages
814
Location
Ottawa, Canada
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.
 
rarefish383

rarefish383

Addicted to ArboristSite
Joined
Nov 2, 2009
Messages
8,361
Location
MD
You are very correct in that Poulan did make fine chainsaws years back before being bought out to cut down on competition. Up here in Canada we could not get US made Poulan saws for many years during the 80`s, couldn`t even get replacement parts so we had to change over to other makers saws and move on from there. I an sure we would have owned and ran the 4000 and 5000 series Poulans if we could have acquired them here during those years. Some how Sachs Dolmar found their way here and we picked them up.
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.
 
Top