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Just completed an Mc1 restoration project and thought you might be interested in some pics.
The PDF document has more pics including photos of unique crank, piston and rod that were only used in this engine. Enjoy........
Scott

nice ! how many types-models do you have in your engine 'museum' ? has to be fun, chasing down parts.

Thanks Butch, someday we will meet. Barnesville maybe?

Unfortunately I did this one for a friend and will probably never see another one. Parts came from several sources from a few good guys. I have a lot of Macs, most models but I am missing a few. I am not trying to own one of each, I just pick them up if they come my way. I like working on them and making the old stuff like new again. My retirement project.

Later,
Scott

That is beautiful. A real work of art. What year is it? It looks like it says 1961 on the manual.

Sterling

Thanks Sterling, it did turn out nice.
It was produced only 4 months, 9/61 to 1/62
Was meant for the bushing class but was so de-tuned that not too many were sold. My buddy had one as his first kart engine and only ran it once and quickly removed it from his kart and got a Power Products.
In 1962 McCulloch came out with the Mc2 for the bushing class which was a much more powerful engine.
I don't think the bushing class was very popular, even the kids wanted something faster!
Thanks again,
Scott

Scott,

Beuatiful restoration job and thanks for posting the pics of the internal parts.
Is it my imagination or is the rod journal on the crank wider that the other Mac cranks?
Interesting to see how little counterweight is on the crank... must have been limited to about 3,000 rpm.
Regards,
Steve O'Hara

Steve,
I should have measured the journal width but yes it was definitely wider as well as wider at the top...a lot wider. I was lucky that I had an NOS piston for it that I received in a parts lot awhile back and kept it. I had no idea what it was for before getting the Mc1 stuff from Terry.

McCulloch must have scraped the tooling for the Base, manifold, tank bracket, crank, rod and piston after this 2 month run was done because I have never seen any of these parts on any saw, outboard or kart engine. I guess they really lost $ on this project.

Another difference is the way the block was ported.

No 3rd ports, 2 exhaust ports, only one intake port drilled on the front side and 2 intake ports drilled on the back side. I guess 3000RPM might be stretching it a bit..LOL

And that LMB Clinton carb was also a limiting factor. This was definitely built to compete with a Clinton A400-A490. Loop scavenged though if you want to call it that.

Another beautiful resto job, Scott! These engines were a lot faster than a Clinton A-400/490, and they would easily turn 4500/5000 RPM. There were several in Brevard Co., Florida, and they were the fastest bushings until the 580B pushed them out. The 580B's were outrun by the use of the 580V5 blocks with the bushing innards. They were, in turn eaten by the Mc2's. There were a couple Mc2's that would give an Mc7 fits. My pal Charlie Craibe's boss, Howard Wyatt (Wyatt Enterprises, Cocoa, FL), was invincible in both the West Bend 580 class, and the bushing class. The old guy could drive like the wind, knew how to modify the engines and had a flyweight Fox. Killer combo! Ted