lengths

  1. Formula390

    520 16T Fronts

    To add to the mix, I'm now also producing a Chromoly 4140 Hardened Rockwell 36C front sprocket for the stock 520 chain. These sprockets are hard clear through, not case hardened as most front sprockets are. This means it'll last a LOT longer. Going up to a 16T front is basically about the same...
    • Formula390
    • Thread
    • 16t 36c center chain chromoly configurations dropping formula390 front gear hard hardened lengths link machining means produced ratio ratios sprocket sprockets steel stock usa vertical
    • Replies: 3
    • Forum: Formula390
  2. Superpacman13

    Intake testing 2-12-18

    We got to play on the dyno and test various intake lengths. It seems there is plenty to gain for the bikes that run at high RPM! https://ibb.co/e211O7
    • Superpacman13
    • Thread
    • 2-12-18 bikes dyno gain intake lengths play plenty rpm run test testing
    • Replies: 27
    • Forum: Gray Area KTM
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