• •

Offroad / Motocross Big Bores

Sort by:

Title

Size

  • CR250 to 270 Big Bore Kit

    Is there anyone who is not running the CR250 with more displacement? A sleeve, Pro-X piston and gaskets and you won’t be left behind!

    Retail: $289.00
    Installation with Power Valve Mods: $550.00

    Call L.A.SLEEVE to order

  • CR80 / CR85 to 102 Big Bore Kit

    The CR102 Big Bore kit is one of Power Products’ most popular kits. This long-running favorite is sleeved and matched ported. The head requires a mod. Supplied with a piston kit and gasket set. Case boring clean-up is required to accept the cylinder skirt. The high-flyer will want to add Stage II porting.

    Retail: $285.00
    With Installation: call for quote

    Call L.A.SLEEVE to order

  • CRF/XR100 to 120 Big Bore Kit

    Here is a nice Big Bore kit package for the fun CRF/XR100. This is a bolt-on kit, which features a big bore sleeve, forged 12:1 compression piston kit, performance camshaft and gasket kit. Machine work is required to install the sleeve into the stock cylinder.

    Retail $375.00

    Let L.A. Sleeve install the sleeve for you – labor $135.00

    Call L.A.SLEEVE to order

  • CRF/XR50 /  CRF/XR70 Big Bore Kit

    The fun CRF/XR50 and CRF/XR70 mini-bikes now have their own NIKS Big Bore kit. This kit features a new anodized billet custom made cylinder, piston kit, gaskets and specially designed off-road WebCam. The kit bolts right on and you are ready to ride or race. The 80cc Big Bore provides great reliability with tremendous gain in displacement. The 88cc Big Bore kit is the largest available kit that fits the stock cases. You will sacrifice some engine reliability to gain 90% more displacement. Also available are packages with Dr.D. pipes, big carbs and filter. A factory look L.A.SLEEVE graphics kit highlights the total fun package!

    Retail (as shown) from $399.00

    Call L.A.SLEEVE to order

  • CRF250R to 270 Peak Performance Kit

    This is the PEAK PERFORMANCE Big Bore kit for the Honda CRF250R 4-Stroke.
    The kit features all the components for big bore power. Included is a new cylinder, big-bored to 270cc.
    A Hi-compression 13:1 forged piston kit, top end gaskets and hi-performance custom grind billet camshaft.
    This Bolt-on kit requires no special machining. Great overall powerband with added torque! Order direct at the L.A. SLEEVE store.
    Retail $799.00

    Call L.A.SLEEVE to order

  • CRF450R to 480 Big Bore Kit

    This hi-performance package requires a Big Bore sleeve to be installed into the cylinder and is supplied with a hi-compression, 12.5:1, forged 99mm piston kit, HotCam, and gasket set. Once installed you will only have to hang on!

    Retail: $615.00 With Installation: $750.00

    Call L.A.SLEEVE to order

  • DRZ400 to 440 Big Bore Kit

    The popular DRZ, LTZ, KLX-400 is tranformed into a powerful 440 with this kit. The kit features a new big bore sleeve, forged 12.5:1 piston kit, gasket set and hi-performance camshafts. Very popular in SuperMotard. The 453cc kit is available for the hard charger.

    Retail: $699.00
    With Installation: $835.00

    Call L.A.SLEEVE to order

  • KX80 / KX85 to 100 Big Bore Kit

    The popular mini Big Bore kits for the KX65 and KX80 are the first choice when added horsepower is needed. The stock cylinder is sleeved with a Big Bore sleeve. The head is modified and the kit is completed with a forged piston and Big Bore gasket set. Oversize pistons are on the shelf to keep the motor running for a long while.

    Retail: $240.00
    With Installation: $498.00

    Call L.A.SLEEVE to order

  • TT-R125 to 145 Big Bore Kit

    This is a big bore kit for the bike that re-popularized small bike fun! the kit features a new cylinder, forged piston kit, HotCam, and gasketset. Minor crankcase clean-up to accept the larger cylinder skirts may be necessary in some cases.
    Bolt-on your cylinder kit and you are ready to ride!

    Retail: $499.00

    Call L.A.SLEEVE to order

  • TT-R90 to 110 Big Bore Kit

    This big bore kit for the popular TT-R90 features a billet aluminum, hard anodized ProCross cylinder, piston kit and gasket set.
    Bolt on your cylinder kit and you are ready to go!

    Retail: $298.00

    Call L.A.SLEEVE to order

  • XR400 to 440 Big Bore Kit

    This is the most popular four stroke single Big Bore kit ever. Easy to install and reliable, it has made the durable XR440 a keeper.
    Also available is the 450cc displacement kit for the hard charger.

    Retail Without Cam: $309.50
    Retail With Cam: $509.50
    Installation Labor Only: $135.00

    Call L.A.SLEEVE to order

  • YZ250 to 270 Big Bore Kit

    The Yamaha YZ250 has its’ own 270 big bore kit. A sleeve, forged piston kit and top end gasket kit are provided to increase your engine displacement. L.A. Sleeve will re-sleeve your cylinder, modify your power valves, re-chamber your head and fit your piston.

    Keep up with the rest of the stealth YZ270 kits with this big bore.

    Fits models 1999-2011.

    Retail: $310.00
    With Installation, Head and Power Valve Mods: $599.00

    Call L.A.SLEEVE to order