greasyxb9s
Well-known member
- Joined
- Oct 22, 2012
- Messages
- 620
So just to throw this out there so you guys can see what my back ground is and what I used to do. I loved racing and building my own motors. The only thing I can't do is the machine work.
This started life as a 2001 shadow storm flat kart chassis that I added a cage too. The cage was mounted on hiem joints front and rear and also slid in and out of it self in the rear so the chassis could work and not bind up. I used a 10sq foot micro wing and a small wing in the front and yes the wings did work and function they weren't just for looks.
The motor was a gx 390 Honda 13hp stock. We took a new forged crank and welded the crank pin and offset ground the stroke 10mm. The rod was a billet piece out of forged aluminum and the piston we took out of a Suzuki ltz 400. It had a 2mm over bore which worked out to be 90mm and the wrist pin was the same size as the stock piston but moved up 10mm allowing me to stroke the crank. All said and done the motor was around 500cc. The head had the most work. We cut the old seats out and put in custom small block Chevy valves at 1.84in and 1.50ex. The port tapered from 44mm super Ben mikuni Carb down to the size of the intake valve to keep the velocity of the port high. He chamber was welded up and redone in a heart shape with a 50cc chamber. We also made out own roller lifters and roller rockers and ran dual valves springs. The motor ran on a methanol/nitromethane mix with around 14:1 compression. I ran a msd ignition that was triggered off the aluminum sfi rated flywheel. I had two rc car battery's for power. The fuel pump ran off of vacuum from the intake manifold and pumped in the Carb and back to the tank. From the pto side of the crank I ran a timing belt close to a Harley drive belt to a jackshaft with a modified 5 disc cyntrifical clutch. The clutch locked up around 6500rpm. This motor dynoed at 65hp and the fastest I ever had it was 120 MPH on a half mile track.
Let me see if I can find some build pictures but this is what it looked like all done before I raced it.
This started life as a 2001 shadow storm flat kart chassis that I added a cage too. The cage was mounted on hiem joints front and rear and also slid in and out of it self in the rear so the chassis could work and not bind up. I used a 10sq foot micro wing and a small wing in the front and yes the wings did work and function they weren't just for looks.
The motor was a gx 390 Honda 13hp stock. We took a new forged crank and welded the crank pin and offset ground the stroke 10mm. The rod was a billet piece out of forged aluminum and the piston we took out of a Suzuki ltz 400. It had a 2mm over bore which worked out to be 90mm and the wrist pin was the same size as the stock piston but moved up 10mm allowing me to stroke the crank. All said and done the motor was around 500cc. The head had the most work. We cut the old seats out and put in custom small block Chevy valves at 1.84in and 1.50ex. The port tapered from 44mm super Ben mikuni Carb down to the size of the intake valve to keep the velocity of the port high. He chamber was welded up and redone in a heart shape with a 50cc chamber. We also made out own roller lifters and roller rockers and ran dual valves springs. The motor ran on a methanol/nitromethane mix with around 14:1 compression. I ran a msd ignition that was triggered off the aluminum sfi rated flywheel. I had two rc car battery's for power. The fuel pump ran off of vacuum from the intake manifold and pumped in the Carb and back to the tank. From the pto side of the crank I ran a timing belt close to a Harley drive belt to a jackshaft with a modified 5 disc cyntrifical clutch. The clutch locked up around 6500rpm. This motor dynoed at 65hp and the fastest I ever had it was 120 MPH on a half mile track.
Let me see if I can find some build pictures but this is what it looked like all done before I raced it.
