79cc Predator 4 stroke on Beach cruiser

Love your build Ron, I bought an exhaust with muffler for $32 including shipping but after putting it on the bike I could see me burning my leg if I moved myleg back.

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So, what I ended up doing was cutting off the flange on the exhaust pipe and also cutting off the the exhaust flange on the muffler that came with the 79 engine and welding the 2 pieces together. It looks good. Hope it rides good.

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Looks good guys, but make sure you put a heat shield over any bit of pipe that possibly can come in contact with YOU!
It doesn't need to be fancy/ the more air space between it and you- the better.
 
There is no material per say that is heat shield stuff. Cars use a metal plate over the cat converter to deflect heat - under it too. They stamp it out of sheet metal. we make it out of whatever.
(Looking at your pic, I would place that pipe in toward the frame as much as possible- quite a bit more than you have)

I cut some sheet metal in a shape to cover my exhaust, then pounded it into a rounded shape to conform somewhat to the pipe. The whole shield looks like a big S. It is attached it with nuts welded to the pipe and bolts thru the shield.

(I have used hose clamps to attach shielding on tractors- you just need to deform the metal down from the shield to form an air gap.)

If that is not enough (wasn't for me) I put some expanded metal in strategic places to protect me- like this-
 

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That pipe is close, too close! I see some well done rockie mountain oysters in your future.
 
I'm collecting parts right now for my next build using a 1961 Schwinn Jaguar frame, found a great handmade fuel tank that will go between the crossbars, and I've ordered the Preditor from Harbour Freight. I'm pondering using 1" copper pipe for the exhaust, whaddaya think?
 
Barry, I suppose it would work if you silver solder or screw the connections. Heat is an issue for normal solder. I use steel tubing.
 
Yes it did get in the way of the transmission. I should have mounted it first that way I could have tilted it up in the rear and have to re-weld the exhaust pipe twice. Here is what it ended up looking like.

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I bought a Harley heat shield for $1.39 and put that over the muffler.
 
Update of 79cc predator cruiser

Hello, Your bike is looking really good, I don't think I have seen any two bikes alike on this forum. Here is an update of my build I started last year, I put in all the lights "working" 12 volt moped battery, Blinkers, headlight, taillight, brake light. and repainted the gas tank with Motobike sticker. I think I am finally done The bike goes about 35 with no problems
 

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