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  • .12XZ Speed Spec II

    By O. S. Engines |
    Product Number OSMG1991
    $0.00

    y Please allow 5-7 days for free in store pick up or flat rate shipping.
    1/10 Desert Truck Rtr
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    This is the O.S. 12XZ Speed Tuned Spec II Engine. COMMENTS: Some notes on Slide Valve and Rotary Carburetors: Rotary Carbs offer a larger response in the middle...*More

    This is the O.S. 12XZ Speed Tuned Spec II Engine. COMMENTS: Some notes on Slide Valve and Rotary Carburetors: Rotary Carbs offer a larger response in the middle of the power band. This works well for off-road applications when throttle response must be varied. Slide Valve Carbs provide greater response at the beginning and end of the power band. This works well for on-road and racing applications for fast take-offs and high speed. jxs 08/20/10 ir/jxs*Less

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    Key FeaturesFull Specs Comments/Reviews
    • Machined aluminum outer head with holes drilled for lighter weight and better cooling
    • Special coating on crankshaft reduces friction and wear
    • Tungsten weights for better balance at high RPM
    • Bore:0.543 (13.8mm)
    • Cylinder head diameter:1.93 (49mm)
    • Displacement:0.128cu in (2.0cc)
    • Height/crankshaft center to top of cylinder head:3.01 (76.6mm)
    • Internal thread size at end of crankshaft:1/4-28
    • Length from backplate to end of crankshaft:3.1 (79.5mm)
    • Length from backplate to front bearing:1.96 (50mm)
    • Length of exposed crankshaft:1.16 (29.5mm)
    • Mixture Control Valve:Rotate until slotted head is flush with
    • Power Output:1.75 PS, 1.73 HP @ 35, 000rpm
    • Practical RPM:5, 000 - 44, 000
    • Stroke:0.55 (14.0mm)
    • Weight:7.76oz (220g)
    • Width between mounting holes opposite side:1.23 (31.4mm)
    • Width between mounting holes same side:0.43 (11mm)
    • Width including mounting tabs:1.53 (39mm)
    • Width not including mounting tabs:1 (25.4mm)
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