You won't believe this

trackfodder

Member
Sep 8, 2008
347
2
18
I am trying to get my 3hp Clinton/Rollfast going again and stuck the Rollfast spring fork back on it so I could use the Schwinn springer on my Schwinn cruiser with the HT. Anyhow, I joined the Ckassic and Antique Bicycle Exchange so I could find out where the fender braces and fender top mount. I think they fasten to the front chrome strut with the spring, but not sure. Anyhow on prowling around I ran across a motorbike made from a Monarch that had a water cooled Evenrude outboard with a radiator driving the front wheel by a big flat pulley on the prop shaft and another wheel driven off that running a round belt twisted 90 deg. to power the fan on the radiator !
It had the usual tank wrapped around the rope start pulley and a teardrop one in the bars that said Evenrude on it. What a Rube Goldberg mess ! I wish I could have reduced it to numbers and imported it for you guys to marvel at. rotfl Keith (trackfodder) Williams
 

Technocyclist

Motorized Bicycle Senior Technologist
Jul 7, 2008
463
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Asia
How much do think that thing weighs? If the front tire had a blow out, it would be a total disaster...
 
Sep 4, 2008
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cool ride!! when i was a kid a couple of older friends took a supercharged twin cyl outboard racing engine and mounted it on a large go cart. used 2 cadilac heater cores for radiators talk about scary it hit 125mph on the local drag strip . if i remember right the motor was a johnson with a paxton belt driven supercharger. evenrude did make a bike motor though its on the www.usscootermuseum.com website.
 

trackfodder

Member
Sep 8, 2008
347
2
18
I can't imagine how a 2 stroke engine could be supercharged other than with an expansion chamber The incoming charge would simply follow the exhaust out the port. The Puch "twingle" is the only one I ever saw that it was possible on as the two cylinders were in a common combustion chamber operating out of phase and the exhaust was closing while the transer port was still open.
Keith (trackfodder) Williams
 
Sep 4, 2008
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sorry trackfodder, i should have investigated other than my memory!!! the only thing i got right was the supercharger type. icalled the one brother that built that thing and he told me as followes. the motor was indeed ajohnson [v-twin inboard] he thinks 250cc a ford 4 barrel carb mounted between cyls with a belt driven paxton super charger on top the motor was a 4 cycle