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Big Bore Thumpers is a division of APE, one of the leading motorcycle performance companies with 34 years experience. All machine work on offroad heads and blocks is performed in APE's state of the art machine shop, on the same equipment as the 200+ h.p. sportbikes components that APE is famous for.

HW-3-4S Install bronze valve guides - single cylinder head $65.00
HW-4-4 Performance valve job $129.00
HW-5-4 Install oversize valves and blend ports - each side $59.00 + valve job

LC180 Bore and hone with piston purchase (at time of purchase) $47.50
LC181 Bore and hone with customer's piston $85.00
LC201D Deglaze cylinder $16.00

LC145 Bore and re-Nikasil single cylinder - w/piston purchase $210.00
LC146 Bore and re-Nikasil single cylinder - w/customer's piston $230.00

Cylinder Heads

Cylinder head work at APE is done on the latest state-of-the-art equipment. We have facilities to completely rebuild all motorcycle heads. As a manufacturer of high-performance cylinder head components, we have all of the parts in stock: bronze valve guides, stainless steel valves, valve springs, titanium retainers and more. Everything we need to complete your job without waiting on the parts - which slows down most shops.

APE's super state-of-the-art Serdi cylinder head machine, with triple-float head for the most accurate valve seats possible.

The Serdi uses a multi-angle carbide cutter that has the seat shape ground into it. This ensures that all angles are exactly the same - all seat widths are exactly the same. A perfect valve job.

Cylinder Center

APE is recognized as one of the leading suppliers of racing pistons for motorcycles. With over 22 years experience setting up cylinder assemblies, APE has developed a skill that allows them to provide the top of the line boring and honing for all makes. Cylinder boring is done on super precision Kwik Way boring bars. These bars locate the cylinder on the bottom surface to assure bores that are dead square to the crankshaft. These machines bore with very smooth surface finishes and perfectly straight and round.

The next step is the hone finish. APE does not use hand hones or bottle brush hones. All honing is done on a state of the art power stroke honing machine. This machine features micro processor adjustable cross hatching. The honing process from the bored surface to the final finish uses multiple stones. ( This is as specific as we will get about this ).

Over the years, APE has developed cylinder wall finishes that promote excellent ring seating and long piston and ring life.

The APE machine shop can handle all of your machining needs including upper case boring for larger sleeves. Resleeving, both stock and big bore. Visit APE's machine services to see all cylinder services available.