gx390

  1. KB2ROCKET

    Clone 13hp vs Honda GX390

    My current project called " THE OX " will be a 2 wheel drive minibike it will be my version of a over built rokon with more horsepower and a better suspension. At the cost of being heavier I want to use this vehicle to explore in areas that most vehicles can't get to so it occurred to me that...
  2. yalipito

    GX340 vs GX390

    According to the Honda specs they both have the same bore and stroke. What makes them rated at different power levels? Head cc's?
  3. FOMOGO

    Honda GX390 Lighting Coil

    I have been researching lighting coils for my 420cc Predator. I have read and been told that the GX390 stuff will fit. Can I get a little advice on out put. There is a 3 amp, a 10 amp and an 18 amp output setup. I figure the 10 amp will keep the battery charged and the lights on. Anybody...
  4. Joe-405

    Raceseng gx390 s2 flywheel info

    I got a new one but don't have any instructions or info with it anymore. Or the coil bracket. What is the timing mark set at for the s2 gx390 flywheel ? And how do you use the degree wheel on these smaller engines. And a long shot but does anybody have a coil bracket or know what I...
  5. LSCustoms

    Project "Blue Angel/F#!K Cancer"- GX390 Powered MiniBike

    I am not sure what to call this one (not that my projects need names, lol). In keeping my promise to make an attempt to move forward and remain positive, I decided to share a project I have been working on more recently and get you guys and gals a little better caught up on it! A few months...
  6. 125ccCrazy

    Big Block GX390 performance parts

    Looking for a cam, billet rod, 1:3-1 ratio rockers, big valve head..
  7. gasser

    Fresh built mild GX390

    Fresh build, with no time on it. - Studded block - Governor removed -Oil alert removed - HD valve springs - Billet ratio rockers - HD pushrods - Guideplate for HD's - New Honda steel rod with removable bearings - New Honda piston and rings - New Honda valves and retainers - Governor...
  8. J

    need help for gx390

    What is the best camshaft for my engine gx390 if i need more speed. Planning to buy 307 lift 260 duration.what does it mean 307rpm camshaft grind?by the way my engine is for boat racing. Direct drive..
  9. M

    Honda GX390 Parts for Predator 420cc

    Hey guys, I am going to use an electric start, big block, motor for my next project- a kart this time. Anyways I want to save a few bucks and get the Predator 420 motor. BUT No one makes heavy mods for it. I asked some folks at OldMiniBikes warehouse, as they have GX390 parts and 420 Parts listed...
  10. L

    throttle linkage/clone top plate gx390 carb on 6.5hp clone

    Hey guys I have a finished mild build motor however I do not have a throttle linkage. I was looking around at either getting a clone top plate or a throttle linkage kit off ebay. However I am running a gx390 carb on a 6.5hp lifan model 168f-2e. The block is 9004 6036. I have been looking around...
  11. L

    gx390 carb on 6.5hp clone

    Has anyone installed a gx390 carb onto a 6.5hp clone or predator motor? What were your engine builds and general rpm ranges? I have a mild built clone I'm thinking about putting a gx390 carb onto and was curious to see what others have noticed. My build will generally be in the 5000-7500 rpm...
  12. boostdoctor

    My Supercharged gx390 Byrd Wren!!!

    3 weeks of hard labor to get this supercharger setup done. But it was worth it. Ungodly power! https://www.youtube.com/watch?v=s41umwMN35E
  13. T

    Predator 212 / gx390 carb?

    Wanna get input on what jets to start out with to run on gas/alky? What seems to run the best?
  14. samevansjr

    Hardly used gx390 Raceseng Rev Roller Rockers S2 1.3:1 ratio for sale

    Hardly used gx390 Raceseng Rev Roller Rockers S2 1.3:1 ratio $130.00 plus shipping.
  15. samevansjr

    Gx340/390 hardly used Raseseng Billet Rev Fin Flywheel for sale

    For sale Gx340/390 hardly used Raseseng Billet Rev Flywheel weighs in at 2.27 lbs. and features a rare earth neodymium magnet that throws a spark 100% hotter then a stock flywheel. The Rev Wheel comes with a coil relocation bracket & timing tape that allows you to adjust your ignition timing...
  16. minibikin'

    GX390 & Pred420 Performance kits are here

    Since our Stage 1 kits are so popular for the GX200 and Predator 212, We now offer them for the big block GX390 and Pred420cc as well!!! https://www.OldMiniBikes.com/honda-gx390-pred420-mini-bike-kit-stage-1.html...
  17. V

    need quiet nuffler for gx390 13hp

    i need a quiet muffler for a 13hp honda. i put on a canister style 3/4 inlet made for a smaller engine and its blown out already.
  18. jdblood202

    Need 1 inch or 40 series torque converter for Honda GX390

    Hey guys, I'm looking for either a 1 inch clutch for a Honda GX390, or if anyone has a 40 series torque converter laying around that they wouldn't mind getting rid of that'd be awesome as well. Thanks guys and just shoot me a pm!
  19. johnatthebox

    gx390 carb for my predator??

    I have a predator 212cc with a OldMiniBikes stage 1 kit w/aluminium flywheel. I put the bigger e-tube and #37 jet in the carb. I also have a seized up honda gx390 pressurewasher with a good carb on it. Which is better? Is it a direct bolt on ?
  20. D

    Need Help Trying to beef up my gx390

    Whats up mini bike I just brought GX390 ae2 motor I need advice on how to beef it out so I could get 20hp or more out of it. I have billet flywheel, big bore and lectron 34mm carb. Im trying to figure out what else I need. Any info would be appreciated.
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