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Filing a chain isn't that big of a deal,mine are half fast .

A lot of kart engine parts are exactly the same . Now about running that old war horse in comp. It won't do worth a hoot unless it's on a big cut,then it will shine .That thing is a torquer,not a rever and a good running 70 cc will outcut it on cants .Then again you west coasters do make the...

I'll have to look at a large Mac coil in the AM Gas.But ithink it might screw out the end .I have a couple in one of my drawers in the garage .If nothing else just tape it up with rubber tape if you can find some or just Scotch 33 ,It won't get ya .That thing has that rubber boot gizmo over the...

It's an exterior mounted impulse driven piston pump on the automatic portion and a standard thump operated pump on the manual part . Before you do anything pump about a half a tank full of kerosine through the system .That gets it most of the time .If not the pump could be full of petrified bar...

I figured about as much . That's where the saw in my avatar came from .After I refurbished it I sent him a picture.He couldn't believe it .:)

I think old Rich might have owned Myrtle Creek saw shop and might have sold it but stayed on as manager .At least that's what I heard .It's been a couple of years since I talked to him . I think JJ lives around there some place too .

I just thought of something and felt it noteworthy to post . On those two old work horse Macs I doubt you need any parts but if you do,there are several possible sources I can think of . Fayettville eqt repair ,in Fayetteville NY .They also have a website . Bob's lawn mower repair service in...

Tygon is the name of one synthetic type of fuel line .Might have the wrong spelling on that .I imagine Mac might have had a special molded fuel line on that saw,they did on many. Fact is many saw makers did . I do about like you and stuff one inside the other and it works . They all try as best...

Might not be a bad idea . If that diaphragm is good as it must be else it wouldn't run ,the gaskets would not be that hard to make . Oh,aha while I'm thinking about it,there is a little gasket betwwen that stupid little prim pump that leaked like a sieve on the infernal flat back on my 250...

I'm not sure if that flat back takes the same diaphragm as the big old monster BCD 's they used on karts or not .Those kits are 50 a pop .:O I'll go on search .

:lol:It's a keeper too .Not to worry he most likely will have the only running one for miles around once he gets it tweeked in .:)

Here is what I found .The 797 is 6 to one comp ratio but I magine it's about like pulling over 10 to 1 . The early 797's used a Walbro flat back .The later ones ,797 S used either a Tilley HL or a Tilley HS or a Walbro SDC I think . The ignition was large coiled like about all the reed valvers...

It's basically the same engine Gary .The exception being the 797 used the same design piston with the bearings in the piston,like a 101 kart engine whereas the Sp 125's had the bearing in the rod . The real early 797's had a full skirt piston with thick rings and the later ones used a seml...

Brakes were an option on the left hand start models like the 125 although I doubt many ordered them that way .I've never seen any type brake on a right hand start Mac .

:lol: Ya done filled it plumb full of noodles .:lol: Sounds okay just needs a tad bit of tweeking .It will do a better after you get the cobwebs blown out of it . Some of the old timers say a 797 was a better go getter than an SP 125 .Can't say myself,never ran a 797 only the 125 .