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Need help from experts.Is this an R-1?What year?Thanks for any help

definitely a mcculloch kart.
r-1 or r200 i'm clueless on the fine point differences.
dave

Hello David,
The floormat is different from the amazing R1 that I saw on Ebay.The guy I bought it from owned it since 1966.He claimed it was a 1965.It is funny it was set up for twin Wb 820's.WB's on a Mac?I only got one of them.The 820 had a steel cylinder head shroud.From my research that is an early one?I am trying to figure out what engines to install to give this kart the respect it deserves.Trying to preserve some karting history!I had heard Mac karts were in production for three years.I would appreciate any thoughts you have or anyone else can share.
Best regards Dean

Mc 20 engines were the hot ones when Mc Culloch introduced the Go Kart line. I bought a dual engine set up around 64/65. Wished I still had them.
Here are a couple pics of what they looked like. This kart was on ebay earlier this year with a Buy it Now for $10,000.

Beautiful kart, too bad the seat color isn't correct for the yellow frame. I believe the metallic blue/white upholstery was correct for the metallic blue '62 300 kart, but not the yellow '61 R-1. Still, a VERY nice restoration.
Don't think there was any difference between the R-1 and 300 other than the name and the color schemes.

It's my understanding that R300's have a stop bolt and boss on the front axles and R1's do not.

R1's have a steel floor pan, R300's had aluminum floor pans. The front axle geometry is different between the two also. I seem to remember Bob McCulloch had an R1 with dual Mc-30's in his showroom and they had recoil starters, McCulloch chain guards, and inboard McCulloch clutches. Max-Torque clutches and starter pulleys were not original equipment.
The 1964 McCulloch kart engine manual has an R1 with dual direct drive Mc-75's pictured on the front cover.
I believe the attached McCulloch picture is of an R 300 with direct drive Mc-30's. The throttle rigging is typical for that era as are the axle sprockets without lightning holes, non space chain, etc.
The first WB 820's did have steel cylinder head shrouds. If they were run hard they cracked regularly.

hi DEAn,
seems you have an r1 as the pan looks steel and i can't see stop bolts.
post a few more pix so as to be sure.
as i understand it no real big difference in them really.
you can run just about any vintage engine on that frame though mcculloch one would seem to be the best choice as it's a mcculloch kart.
mc20's are kinda hard to come by a mc6, or mc7 would be about right year wise too.
basically run any mcculloch two stroke on it and few would fault you.
dave

More pics guys.What were the years of production?The blind headed rivets and checkerboard floormat have me guessing.Defineatly a steel floor pan.It has had 2 bad repaints one maroon?one the ugly green.There is a pic of the original yellow on the inside of the wheel.HELP.The steel shroud on the WB was cracked up real bad.Run hard I guess.I have one MC 45 need one more.I think it would be cool with that combo.I missed out on the pair of 30's on Ebay dammit.Has anyone ever color matched Mac yellow in PPG urethane or base clear?If not I will share my findings on the wheels original color.
Dean

mac kart