Early Mac "10" Series differences !!
Alpinecrick --
In response to your question .....
[probably more info than you want]
Background >> I have a "collector-grade" Mac 1-10. The cosmetic condition is about 96-97% of new. I closely estimate this saw was made in 1965. Still
has shiney yellow paint. Not too bad for a 44 year old saw. My saw is #2099 out of over how many million made? It's pre-everything. Extremely early production unit. I needed to educate myself on this saw because of the MAC "W" [flat] carb. Different animal. Nobody really cares for this carb, but it's what I got! And, it's original--some value on this particular saw. These 10's ran proper & good from the factory, right?? [hope so]!
Well I've educated myself pretty well with the carb. Feel confident in working on it & tuning. BUT NEED A New DIAPHRAM !! Help!
In learning about these early 10's I discovered what the differences are.
As follows >>
Mac basically built these saws with factory options. Like leather or sunroof on a car. All had same engine block. This sales sytem is really not used by todays manufacturors.
[Snapper Lawn Mowers does use this system to a degree]
1-10 -- more basic saw
2-10 -- added auto oiler
3-10 -- auto oiler AND "DSP-Easy Start" ["50% less effort"!!]
4-10 -- auto oiler, but without DSP-Easy start. AND, added Idle Governor
[made for smooth engine idling]
5-10 -- ALL of the above >> loaded model, all of the bells & whistles.
** Additionally 2-10G & 5-10G gear drive models were made.
** And, 3-10E & 5-10E Electric Start Models were available.
With that said, my 1-10 HAS the Idle Governor on it from the factory.
Wasn't supposed to. Who knows?? Maybe a 70cc engine lurks under my hood.
LOL.
The Idle Governor is attached to the throttle shaft. It has a coiled spring with a ratchet system. You can change the position of the spring on the ratchet for more or less tension. It doesn't look goofey. It gave stability to the throttle setting/idle. Works, I hope. It's simple & tidy.
Additionally all of these saws had : -- reborable cast iron liners
-- [2] cast iron piston rings
-- 3rd port cylinder design.
MAC really wanted to cover all of the bases with these saws. They Did!
And possibly keeping the prices low.
My 1-10 is all magnesium and Super Light weight. 10.5lbs. And, with a cast iron liner...It's amazingly light and nimble.
Mac did some fantastic engineering with these saws.
Got all this?