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  1. KartFab

    212cc engine

    You can get most realistic numbers from the off the shelf engine descriptions from NR racing
  2. KartFab

    Correct jetting for stock GX390

    .039-.041”
  3. KartFab

    Predator motor , yerff dog , jack shaft , 30 series converter and cursing !

    Yerf dog runs a 7” driven. Run the sprocket on the outside of the jackshaft and relocate axle sprocket.
  4. KartFab

    Predator 212 compression

    Compression on a compression release engine means nothing. look up summit racing compression ratio calculator.
  5. KartFab

    Predator 212 tossed a road

    Easy, set your valve lash to .002-.003” with feeler gauges.
  6. KartFab

    Small Block vs Big Block Speed Difference? What is Better?

    If I remove governor, then I’m putting a cam in it. Stage 1 adds like 10-25% more hp, and a cam adds a crap ton more.
  7. KartFab

    Small Block vs Big Block Speed Difference? What is Better?

    You should get a billet rod, advance timing by 4 degrees, and get an NR racing 280 cam, torque grind.
  8. KartFab

    Small Block vs Big Block Speed Difference? What is Better?

    The gx390 Mano I have was stock stage 1 believe it or not. I upgraded a few things on it like 280 cam and connecting rod, but other than that it was stock. It actually was a very mild build.
  9. KartFab

    Small Block vs Big Block Speed Difference? What is Better?

    Mild modified big block was floating the valves at 65 mph in under 300 ft, where higher stage small blocks were barely able to hit 55 mph in the 1/8th mile. This was at a drag race a few months ago.
  10. KartFab

    Stage 2 GX390/Predator 420 Specs?

    this is about right but yours will make less because the carb is more restrictive than the stock appearing 24mm http://www.nrracing.com/product-p/eng-rac-420-pack2.htm
  11. KartFab

    Last chance

    Last chance to win this mini bike by midnight tonight!!! https://teenlife.rallyup.com/minibike
  12. KartFab

    Mini Bike Give Away

    Hello everyone, this is Grant. I have a little youtube channel and for those that follow the facebook page, muscle mini bike builds, you will recognize this beautiful mini bike as one of the top winners in the build off. I've had some recent life changes that have prompted me to give this mini...
  13. KartFab

    I need help

    2 stroke toro trimmer Was running ok then quit. Felt like it wasn’t revving out all the way. Would not restart. Put in fresh fuel would not start Carb cleaner sprayed directly in throttle body. Nothing Spark plug grounded and pulled could see spark Replaced spark plug would not start...
  14. KartFab

    How To Race Mini Bikes

    It has been a while since my last upload. For those that want to get into mini bike racing, this is the official "how to race mini bikes" video I put together. It has a few race tips, and a few guidelines for engine mods, but mostly gives a perspective from the Texas Outlaw Mini Bike racers...
  15. KartFab

    Winch in Ground

    So i may have ran over our neighbors grass a time or two, and my wife may have taken out our fencepost. This leads me to exhibit A. Winching the trailer up our weird, steep, and wonky driveway. I took some leftover 1.5"x3"x14ga square tubing from a previous table build for a customer (back...
  16. KartFab

    i had an epiphany - some people are like small engines.

    Some people are like small engines. They like to be choked to turn them on. If you keep choking them, they will die.
  17. KartFab

    squeaky clean mini bike

    This was a harley davidson mini bike race and these two fine ladies were washing the bikes. After the races, (and a few beers :cheers2:) one of the guys had them wash his mini bike.
  18. KartFab

    Manco Thunderbird Resto-Mod

    And so it begins with a seized tecumseh OHH60 with 1/8" ring gap, and an abused manco thunderbird frame with bent front forks.
  19. KartFab

    Please Vote for Me

    Whats up everyone? I recently finished a 3 month build of a manco thunderbird, with all the street legal goodies, and i even took a stab at getting a seized tecrapseh engine going to stage 3... and it worked! If you have any bit of goodness in your soul, please for the love of all that is good...
  20. KartFab

    Honda Bond (RTV Silicone) vs Copper Coat on head gaskets

    Just my two cents here, as I have now used both on copper head gaskets. Anybody have input on these? Copper Coat sprays on easily you have to wait for it to FULLY CURE before assembling gasket High Temp Honda Bond messy, so apply with gloves, apply in a very thin layer wait a short amount of...
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