210•410•6031

Questions about motorcycle engine repair

What engine work does SCS Racing do?

Top end and bottom end work on two-stroke and four-stroke off-road motorcycle engines: pistons and rings, valves, valve seals and guides, cam shafts and chains, seat cutting and porting, cylinder service, crank service, and transmission and clutch repair.

What is the difference between a top end and a bottom end rebuild?

A top end job covers the piston, rings, cylinder and, on a four-stroke, the head and valves. A bottom end job goes into the cases for the crankshaft, bearings, transmission and clutch. Which one a bike needs depends on compression, leak-down and what is found on teardown.

How do I know my dirt bike needs a top end?

Hard starting, lost power, more smoke than usual on a two-stroke, a knocking or rattling sound, or a compression reading well below spec are the usual signs. Hours on the engine matter too, and race bikes need top ends far more often than trail bikes.

Do you work on all brands?

The shop is set up for off-road bikes, with factory training on KTM, Honda, Suzuki, Kawasaki and Yamaha, and it also handles vintage machines. Call 210-410-6031 with the make, model and year before bringing a bike in.

Why does porting and seat cutting matter?

Porting shapes the intake and exhaust passages so the engine breathes the way the rider wants, and a proper valve seat cut seals the valve so compression and power stay where they should be. Both are measured, not guessed.

How long does an engine rebuild take?

A top end with parts on hand is usually a few days. A full bottom end rebuild takes longer because of the teardown, inspection, parts ordering and the machine work. The timeline is set once the engine is opened and the parts list is known.