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Big Bore Kits

  • Daytona Big Bore Kit, Honda CRM50

    Daytona Big Bore Kit, Honda CRM50

    Engine Displacement (62.9cc)=Bore Diameter: 44mm x Stroke Length: 41.4mm This Big Bore Kit will give you a short cut to increase power!Not like standard big bores kits adjusted for race regulations at a maximum of 60cc, this city use big bore kit will...

    US$251.41
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  • Big Bore Kit, Yamaha TZR50 93-

    Big Bore Kit, Yamaha TZR50 93-

    Engine Displacement (68.8cc)=Bore Diameter: 47mmxStroke Length: 39.7mm The shortest distance to Power up!Unlike traditional Race regulation's upper limit of 60 cig Big bore, the city ride Big bore aiming for Engine Displacement Volume Up to the limit...

    US$251.41
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  • Hyper Head 124.8cc Version Up Kit

    Hyper Head 124.8cc Version Up Kit

    Hyper head big bore kit It is Kit for version up from 124cc to 124.8cc. *Please use the high-octane fuel.*It requires crankcase boring (Diameter 56.6 to 56.8mm, depth 27mm).*It requires installation together with the outer rotor kit, secondary side...

    US$577.31
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  • SP Crankshaft 41.4mm

    Stroke: 41.4mmCrank Shaft Assembly Weight: Approximately 1725g (STD Weight: Approximately 1810g)[Included Parts]Woodruff KeyCrankcase Gasket Best Balance to 85/88cc!Approximately 100 g lighter than Standard Crankshaft.SPCrankshaft which balanced...

    US$232.78
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  • Crank, Long Stroke 52mm

    Crankshaft Assembly Weight: Approximately 1.930g Fits: HONDA GORILLA (GORILLA) 1978 [Frame No.] Z 50 J - 1300027 to 1410978 HONDA GORILLA (GORILLA) 1981 [Frame No.] Z 50 J - 1412284 to 1428813 HONDA GORILLA (GORILLA) 1982 [Frame No.] Z50J-1429176 to...

    US$260.72
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  • Crank, Long Stroke SP 52mm

    Crankshaft Assembly Weight: Approximately 1.870g Fits: HONDA GORILLA (GORILLA) 1978 [Frame No.] Z 50 J - 1300027 to 1410978 HONDA GORILLA (GORILLA) 1981 [Frame No.] Z 50 J - 1412284 to 1428813 HONDA GORILLA (GORILLA) 1982 [Frame No.]...

    US$307.28
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  • Long Stroke Crank 52mm

    ● Crankshaft ASSY Weight: about 1,930 g. ● Since the crankshaft is damaged, it is necessary to install it simultaneously with a lightweight outer rotor (weight of flywheel 700 g or less). ● Since the top dead center position drops by 0.8 mm, there is no...

    US$260.72
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  • Long Stroke Crank SP 52mm

    ● Crankshaft ASSY Weight: about 1,870 g. ● Since the crankshaft is damaged, it is necessary to install it simultaneously with a lightweight outer rotor (weight of flywheel 700 g or less). ● Since the top dead center position drops by 0.8 mm, there is no...

    US$307.28
    Add to Cart