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  1. J

    GX390 upgrades on the cheap.

    Hey mate mine came with a gx160 originally so I just just had to re-drill the mounting holes on the original mount. Maybe you can fabricate one up?
  2. J

    GX390 upgrades on the cheap.

    No i am just running thr standard crank. Didnt shorten it but had to grind the counterweight to clear the conrod. Take as least off as possible. No balance shaft means less inertia to spin so it gets to higher rpm quicker
  3. J

    GX390 upgrades on the cheap.

    Here's the finished product :) https://youtu.be/-0qhKkUgOaY https://youtu.be/-1PDBEQq2yU
  4. J

    DeadRift-Drift Trike project

    hey joekr keep the pics and detail coming. So interesting. Looks awesome. One question.. why solid wheels? That must be rough!
  5. J

    To advance the timing, or not?

    You don't need to but it will improve throttle response instead of being sluggish. You will like it. https://youtu.be/7JbNzoUjpFw Watch this video and pay attention to how he lapps the flywheel to the crankshaft with valve lapping paste...
  6. J

    GX390 upgrades on the cheap.

    Also a tip for removing the balancer bearings if you don't have a puller small enough. This is what I did. Couldn't believe it worked! https://youtu.be/nkRmKWktW70
  7. J

    GX390 upgrades on the cheap.

    Hey guys, just a few pics from my recent build if anyone is interested. It pulls hard! So much fun. The clutch is getting quite hot so I think im going to run purple springs in it. Has anyone had any experience with the noram star?
  8. J

    GX390 upgrades on the cheap.

    Hey Joe could you post a video of you running your engine at 9k rpm? That would be cool. Thanks mate.
  9. J

    GX390 upgrades on the cheap.

    Joe405, 9200rpm! That thing must be screaming!!
  10. J

    GX390 upgrades on the cheap.

    Hey Chancer I couldn't believe my luck but I actually won the kart at a local tool store that had a Sidchrome competition going. It was setup with a 160cc and wet clutch and didnt have much go about it. Ive done a few things to it now. :wai:
  11. J

    GX390 upgrades on the cheap.

    Yeah firemanjim I noticed that after I popped them on. I thought the logo would go to the outside but obviously you can only have the logo to the outside on one side. I dont think it will make too much of a difference for me since I won't be racing.
  12. J

    GX390 upgrades on the cheap.

    :iagree::thumbsup:
  13. J

    GX390 upgrades on the cheap.

    Yeah I need to get a tach for it firemanjim. So I bit the bullet and bought some parts from NR Racing. Items Ordered: Price: Status: 1 of : Camshaft, 306 Series - (GX240s to GX390s) [Camshaft Grind:306 RPM] $119.00 Processing 1 of : Chain, RLV Xtreme, Gold on Gold, #35 - 106 link $24.00...
  14. J

    GX390 upgrades on the cheap.

    ok thanks kartfab. Does anyone know what rpm I would be getting with hd springs, arc flywheel, arc conrod and high flow intake with the "stock" cam?
  15. J

    Finally back out on the track!!

    Looks like fun!
  16. J

    GX390 upgrades on the cheap.

    Im not sure but I think I may have a 4500rpm rev limiting coil. It is a clone that I bought recently. Im not sure how to tell?
  17. J

    GX390 upgrades on the cheap.

    Hey Fabroman, I live in Dysart, QLD. It's a coal mining town. If I go to a smaller sprocket on the axle and are just driving around on dirt, grass and road stop starting all the time I think it would be too much on the clutch. I had a 75 tooth on the back but I did not have enough clearance so I...
  18. J

    GX390 upgrades on the cheap.

    Hey guys I have a kart which had a gx160 and swapped it out for a gx390 since I weigh 100kgs. I am running a dry clutch with 73tooth on the axle and 15tooth on the clutch. It has lots of torque which is great but not a lot of top end. I was wanting to know what would be the cheapest route of...
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