Big Bore Master List
COMPLETE KITS PARTS AND LABOR
![]() |
3 CHOICES - SUPER-STOCK, SUPER-MOD, AND BIG BORE
All kits for original plated cylinders include new piston kit, top end gaskets, copper washers and alignment pins, top end bearing for parts.
The repair services include clean & chemical strip, TIG welding, boring, NICOM plating by USC Technologies, cylinder head resurfacing and
mods, cylinder base machining, and powervalve cleaning and assembly. THERE ARE NO EXTRA CHARGES. We won't nickel and dime you
with silly charges like stud removal, hazardous waste disposal, shop supplies like our competitors do. The following are special options for
each kit.
SUPER-STOCK (SS)
These kit are for riders whom want to keep their cylinder the original size to be legal for stock classes in any racing organizations. We push
the edge of the envelope by Blue-Printing the ports to the same timing as quoted in the Factory Service Manual. Also the gasket surfaces of
the cylinder base and head will be turned on a lathe and the head chamber polished. For bikes with powervalves we will clean and polish the
parts and re-time the parts for easy installation. You get the added choice of setting the cylinder head to run pump or race gasket and to
compensate for high altitude riding. Piston choices include Wiseco, Pro-X, Vertex, and Wossner.
SUPER-MOD (SM)
These kits feature a maximum oversized bore (2mm/.080inch) for displacement/modified classes. Also included is cylinder porting and
polishing with head mods for 3 choices of powerband and fuel types: #1 More low to mid-range #2 More mid to top end #3 More better
wider power and the fuel types of 91 unleaded pump gas, 98+ race gas, and oxygenated race gas.
BIG BORE (BB)
These kits feature the biggest bore size (4-6mm/.160-.240inch) vet/displacement/modified classes or outlaw racing. Also included is cylinder
porting and polishing with head mods for 3 choices of powerband and fuel types: #1 More low to mid-range #2 More mid to top end #3
More better wider power and the fuel types of 91 unleaded pump gas, 98+ race gas, and oxygenated race gas.
JAPANESE DIRT BIKES and ATV
EUROPEAN DIRT BIKES and KARTS
We also have kits for ATK, GasGas, Maico, TM, and Zundapp based on piston availability.