1951 24" Monarch Rocket Board Track Racer

I aquired this 1951 Monarch 24" Rocket for $40 on Craigslist the other day. I used a premix fuel can ya get at home depo, sanded it, tapped a petcock in, and it holds with no leaks. Just need to spray it down with salt water to get it to rust. I used strips of rubber to hold it against one side of frame. I might add another one on other side for looks.... There was no caliper hole for front brakes on the forks, so I welded a caliper bolt on nice and straight and it works great! To get the motor to fit I had to order a 25 tooth crank sprocket, and bend the front universal mount so it lined up with bottom tube. The engine is a 66cc china ported 2mm off sides of intake and exhaust, exhaust raised 2mm, piston ported on transfers, knifed transfers and widened, port matched, del clone carb w/ 71 jet, and will run a 32-36 tooth drive sprocket. It was pushing 42 mph with a 41 tooth on a 26" mountain bike. It should move this 24" pretty good. Let me know if you want pics of details....To be continued...

 

[Fast Shag]

 

[boneswood]

If you have a welder I suggest adding about 6 inches to the back end. I did this on one of my bikes(added 8 inches) and I found it corners better. Cool lookin build!

 

[Fast Shag]

I haven't had the chance to test ride it yet. I'm waiting on a solid, 8" custom layback seat i'm having made by Chop Shop Customs. I don't have a welder, but have resources. We'll see how it handles, but I I think you are right that the wheel base would be better a few inches longer. I've seen some bolt on rear wheel brackets that have been made, but not at 8". Thanks for the insight!

 

[boneswood]

Here's the bike I added 8'' to. I call her Molly. I took another frame, cut it apart, and used the back end to extend the chromoly frame. She's a truck.

 

[Fast Shag]

I got most of her put together; just waiting on custom layback seatpost! I had to grind both sides of cranks down bout 3/16 to get clearance of motor. Got about 1/8 on each side. Mounted a 3rd motor bracket for side to side play using clutch plate and seat tube. Had to fab a shortdog chain guide for frame clearance, shim rear tire for clearance, welded front brake calipers on, modded Bendix hub to accept 36 tooth sprocket and install a 25 tooth crank sprocket so the motor would fit. The exhaust is gutted, and the gas tank is vented and holds fuel! Almost ready to rip!