I'm building two custom motorized bicycles with GT2 aluminum frames, Worksman 26 x 2.125 alloy wheels, coil spring suspension forks, alloy stems and bars. I recently finished mocking up one bike, I plan on painting it royal blue so I'm calling it the "Royal". It has a front drum brake and the engine has some minor mods, like a cut piston and drilled wrist pin. I replaced the wrist pin bushing with a roller bearing, and that's it. I'm running a 44T aluminum sprocket with a 415 drive chain. I haven't done any carb jetting and I'm using the stock pipe and air filter. I had trouble starting it until I switched the choke to the off position and she fired up. At first it barely ran and I was fearful that I had a 66cc lemon. After tightening the carb clamp and carb cap it ran much better. I've burned less than a quart of fuel at an 18 to 1 break-in premix ratio. The more I ride it the better it runs. I weigh 230 lbs. and yesterday I was clocked at 32mph on level blacktop with no tail wind!!! This fare exceeds my expectations for this almost stock china engine. Kudos' to Motovelo from whom I purchased the engine.
The second bike is still on the rack about 85% complete. I call it the "Sprint". The engine and all the components except the wheels are blacked out and I installed a front disc brake. The frame will be brushed and clear coated. The engine came with a cut piston and drilled wrist pin and I replaced the wrist pin bushing with a bearing the same as I did to the Royal. I replaced the entire top end with performance parts; 6.0 - 1 high compression billet aluminum head and a ported jug. Unfortunately the porting job I paid for looked like it was done with a hammer and chisel so I had to rework the intake, exhaust, and transfer ports myself (Jake Bike SUCKS). I also had to match the plenum intake to the cylinder intake port because it was a full 2mm smaller (Jake Bike SUCKS), I matched the intake gasket too. Before I installed the expansion chamber I welded up the deficits on the inside of the chamber manifold and matched and polished it to the cylinder exhaust port, and of course matched the exhaust gasket too. I installed a Mikuni VM 18 dual stage carb, and a 90 degree free flow air filter. I'm running a 40T aluminum sprocket with a 415 drive chain. After being so very impressed with the Royal I can't wait to see how the Sprint runs!!! Check out the pics. I'll keep you all updated. By the way both bikes are for sale...
![xct2 xct2 xct2](https://motorbicycling.com/images/smilies/xct2.gif)
The second bike is still on the rack about 85% complete. I call it the "Sprint". The engine and all the components except the wheels are blacked out and I installed a front disc brake. The frame will be brushed and clear coated. The engine came with a cut piston and drilled wrist pin and I replaced the wrist pin bushing with a bearing the same as I did to the Royal. I replaced the entire top end with performance parts; 6.0 - 1 high compression billet aluminum head and a ported jug. Unfortunately the porting job I paid for looked like it was done with a hammer and chisel so I had to rework the intake, exhaust, and transfer ports myself (Jake Bike SUCKS). I also had to match the plenum intake to the cylinder intake port because it was a full 2mm smaller (Jake Bike SUCKS), I matched the intake gasket too. Before I installed the expansion chamber I welded up the deficits on the inside of the chamber manifold and matched and polished it to the cylinder exhaust port, and of course matched the exhaust gasket too. I installed a Mikuni VM 18 dual stage carb, and a 90 degree free flow air filter. I'm running a 40T aluminum sprocket with a 415 drive chain. After being so very impressed with the Royal I can't wait to see how the Sprint runs!!! Check out the pics. I'll keep you all updated. By the way both bikes are for sale...
![xct2 xct2 xct2](https://motorbicycling.com/images/smilies/xct2.gif)
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