5
5-7HEAVEN
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When I wrapped up the "GP460 Engine On Friction Drive" project, I expected "The Iron Dragon", a short Giant Rincon bike to be a dependable commuter bike, despite its lack of low end torque.
Unfortunately, two days later the 460 engine again chewed up its clutch springs enroute to work. Instead of buying more springs, I ordered an adjustable pocketbike clutch for this GP460 and a entirely different drive system. Everything will be bolted onto a second bike, a much taller Diamondback Response MB. So I removed the 460 engine from "The Iron Dragon"...
and installed a high-performance pocket bike engine in its place.
This was something I had purchased on ebay two years ago and placed onto the shelf. The seller claimed he had dyno sheets proving that the engine made 10hp.
I'll be happy with 5 HP.
Anyway, the pb engine bolted onto the existing components of "The Iron Dragon" with minimal changes. BMP friction drive engine housing, fuel lines, goped tank, 1.375" Staton friction roller. Even the ADA pipe bolted on, but at a different angle. The exhaust flange's bolt holes were enlarged to accept the pb engine's port.
I had some difficulty hooking up the throttle. The previous owner installed a Walbro carb and fabbed his own throttle cable guide slightly off kilter. The cable feels very stiff, so I may need to make a smoother throttle system.
I just need to order or make an exhaust gasket for the engine. It should be ready to fire up tomorrow.
I've got a feeling that this engine will have a LOT more low end TQ than my GP460 engine. Using the existing 1.375" roller, I should hit 35mph at 9700rpm.
Time will tell.
Pictures to follow when I meet up with Hawaii Ed.
Unfortunately, two days later the 460 engine again chewed up its clutch springs enroute to work. Instead of buying more springs, I ordered an adjustable pocketbike clutch for this GP460 and a entirely different drive system. Everything will be bolted onto a second bike, a much taller Diamondback Response MB. So I removed the 460 engine from "The Iron Dragon"...
and installed a high-performance pocket bike engine in its place.
This was something I had purchased on ebay two years ago and placed onto the shelf. The seller claimed he had dyno sheets proving that the engine made 10hp.
I'll be happy with 5 HP.
Anyway, the pb engine bolted onto the existing components of "The Iron Dragon" with minimal changes. BMP friction drive engine housing, fuel lines, goped tank, 1.375" Staton friction roller. Even the ADA pipe bolted on, but at a different angle. The exhaust flange's bolt holes were enlarged to accept the pb engine's port.
I had some difficulty hooking up the throttle. The previous owner installed a Walbro carb and fabbed his own throttle cable guide slightly off kilter. The cable feels very stiff, so I may need to make a smoother throttle system.
I just need to order or make an exhaust gasket for the engine. It should be ready to fire up tomorrow.
I've got a feeling that this engine will have a LOT more low end TQ than my GP460 engine. Using the existing 1.375" roller, I should hit 35mph at 9700rpm.
Time will tell.
Pictures to follow when I meet up with Hawaii Ed.
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