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Welcome to the TBoltUSA Tech Database! To visit our store, click here, or use the menus at the top of the page.

Engine & Engine Build Terms
TBolt USA Tech Database!


Square Bore - An engine with the same bore x stroke , example 54mm x 54mm 

Under Square - An engine with smaller bore than  stroke , example 52.4mm x 57mm 

Over Square - An engine with a larger bore than stroke , example 51mm x 57mm 

Deck height - The distance from the top edge of the cylinder to the outer edge of the piston crown at top dead center.

Pin height - The distance from the center of the wrist pin to the upper edge of the piston crown or face.


Pit bike Buying and Ownership info

Pit Bike Wiring Info

General Motorcycle Maintenance

Identifying Parts, Bikes, and Engines

General Motorcycle Troubleshooting

Pit Bike Installation Info

How Things Work

Parts Diagrams and Breakdowns

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