RM100/KX 80/ KX 85/ KX 100 -> 105cc Big Bore Stroker kit
Fits KX 80, KX 85 or KX 100 1998-2007 and RM100 1998 through 2003. The kit includes: +2mm HotRods Stroker Crankshaft. Big Bore (Nikasil plated) cylinder 52.75mm bore. Cylinder head modified for the big bore piston and stroker crank . Powervalves machined for bigger bore. Wiseco custom made Pro-lite 52.75mm piston, rings, pin and clips, top-end bearing and a top-end gasket set. The exhaust port gets enlarged and polished, the transfer ports get the rough casting flaws removed and finished with a glass beaded finish. Removing casting flaws and polishing the exhaust port will gain significant power in midrange and top-end without loosing any low end power. The bigger bore amd longer stroke adds power all through the powerband. The combustion chamber of the head gets polished also. This kit uses a custom made light weight piston that performs much better than the piston used in our 107 big bore kits. The piston intake skirt is cut out to allow more air flow than the full skirted 107 piston, this combined with the stroker crank performs much better than a 107 big bore only. The stroker allows for a taller exhaust port which increases exhaust flow.