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it is a very quick and easy upgrade as it does not require case boring
While the bore kit provides a nice power gain over stock
- Performance CDI ($25 savings)
This is standard practice for just about any 20mm or bigger carb that you put on the bike
TRAIL BIKES TBW0711 6v Tune Up Kit
146cc Big Bore Piston & Mikuni VM26 Kit - 14mm Piston Pin Engines - TBW9070 crf80 it is a very quick146cc Big Bore Piston & Mikuni VM26 Kit 14mm Piston Pin Engines Part Number: TBW9070 141cc (57mm) Bore Kit and Mikuni VM26 Carb Kit for Chinese 120cc Engines with Big Valve Cylinder Heads (27 23mm or 30 23mm): Aluminum cylinder with steel sleeve High compression large dome 57mm piston with rings, 14mm pin, & clips Head gasket kit Genuine Mikuni VM26mm 606 Series Performance Carb (Not a cheap Chinese copy) Intake Kit Jet kit with 3 different sizes