1. Testname111

    ATHENA 69.8 CC bicycle frankin-bike :)

    I made this after finding out the smolikperformance.com kit big bore still had a 40mm piston stock China girl size Check it out, my new Athena minarellie clone with carbon reed I plan on making a copper exhaust, 47.6mm piston true big bore should I braise or hose clamp all my coper joints...
  2. V

    Hello new here! please help I got a question!

    Hello I am building a mortized bike but the engine sproket won't turn i havent actually finished building it.But i tried to put a chain but I saw in the video how the dude turn the sproket easily and put the chain there into the engine and I tried the same and it won't move it will only move if...
  3. CrimsonPrince

    Motorized BMX Funding Request

    Hi everyone! As you may already know, I have been posting up my progress on a motorized BMX bike build and would like to begin by extending my thanks to all of those who have commented and imparted their suggestions to enhance the quality of the build as it makes headway towards completion. At...
  4. CrimsonPrince

    Engine BMXs Challenge: Series Premier

    Hi everyone, I'd like to introduce myself here by posting this thread concerning my goal to build a motorized BMX bike. You're probably thinking, "motorized BMX", is this guy crazy? I would agree and say yes, but I'm not that crazy. Like, think of all the other crazy things I could be doing...
  5. L

    Pick one!

    Howdy, I'm building a hill climber, not a street racer or commuter. There are so many brands and merchants selling motor kits now that it's crazy. I'm looking for guidance/tips on which kit I should select on a budget ;). 56 to 60 tooth sprocket Hopefully sprocket adapter If it's bad, I will...
  6. breath_easy13

    pred 212cc wont start

    So, there i was, carried the beast down the stairs of my apartment - 7 months of building and dreaming in my office space, and finally the day has come. Threw oil in, some gas, went to start it up, BOOM gas i dripping from the carb filter. That issue was resolved quickly - realized i ran the...
  7. A

    High Idle Problems

    Hey Everyone I have a high idle and this occurs with the idle screw all the way out and not throttle cable bindings no air leaks anywhere found. and I'm a bit curious of what could be the problem running about 4k rpms at idle without choke and with choke it settles all the way down to about 1k...
  8. J

    Engine Wont Go full speed

    Hello, I have viewed through a lot of posts and still can't seem to find a proper answer and reason for my problem, so if someone could help me out that would be greatly appreciated. I'm a newbie at motorised bikes but I learnt a lot I got my bike pre-made and was told how to properly maintain...
  9. breath_easy13

    governor removal and "little pin" pred 212

    Finally getting started on the pred 212 build. Prepping the engine for a vert install and mikuni carb, i went ahead and removed the gas tank, carb, and throttle linkage bar (if thats what its called) and now im left with this little pin you can see below. I've been told i need to remove the...
  10. C

    Compression discrepancy

    Quick question... I have a Skyhawk Gt5a, and I shaved the head for. Higher compression. .. I am being told by 2 different people 2 entirely different "normal" readings for a stock engine. One guy says 80-90psi stock Other guy says they come 130-140 stock. Pretty big difference here. Any...
  11. Degoragon

    Generic "No Name" Ebay/Amazon engine kits. Anyone use them?

    I Have noticed a lot of the people on this forum seem to buy a certain "Name Brand" (GruBee, Flying Horse, RAW, Zeda, BBR, Golden Eagle, DAX, etc) and roll with it. I was wondering, has anyone here bought one of the cheap, generic kits you can find on eBay, Amazon, Wish, etc. ? If so, how is...
  12. RocketJ

    Let's build a V twin engine

    Gents, It's time to discuss the elephant in the room: v twins! For years, this forum has been asking about the ability to use a v twin in a frame and this summer I plan on making that a reality. Several months ago I saw a v twin air compressor pump and wondered if it was possible to convert one...
  13. C

    Need help: first build; engine wont start was origionally running

    So I have set the engine onto the mountain bike have checked the spark plug for spark and I do get spark when tested on the outside case. I can get the engine started when I peddle to 20km/h but it wont idle and The throttle needs to be full throttle. If I start at a lower speed I get...
  14. Memy1251

    Won’t idle:

    hey guys, so my first build i ran it and the engine idled flawlessly. For a while, then the bike would no longer idle. When I pull the clutch the RPMS shoot sky high. When I leave the clutch it’s always trying to go like a car placed in “drive”. Any ideas? Thanks guys!
  15. Muaya

    My new engine is making weird noises and losing power Help!

    Hello, I have a 80cc CDH Power with less than 200 miles. I'm still using the 16:1 mixture, however recently it began losing power specially when going uphill and the other day it completely left me stranded. I had already cleaned the carb a couple of days before that. Today after changing the...
  16. J

    I need help in version and type of my kit engine

    I have a problem in my clutch and I do not know what type and version it is, I need to know to buy a new one, could someone help me find out what it is? I only know that my engine is 4-stroke
  17. carl clack

    Porting First Time No Problem?

  18. carl clack

    The Piston Came

  19. J

    Engine won’t idle and stops with clutch disengaged

    Problem-first start** -engine won’t idle but runs with 1/2 accelerator with clutch engaged - soon as clutch is disengaged while riding the engine sort of stalls an accelerating does nothing - the engine sounds like it is either starving or flooding maybe ? Things to consider ? -Bike came...
  20. J

    Engine won’t idle and stops with clutch disengaged

    Problem-first start** -engine won’t idle but runs with 1/2 accelerator with clutch engaged - soon as clutch is disengaged while riding the engine sort of stalls an accelerating does nothing - the engine sounds like it is either starving or floodin maybe ? Things to consider ? -Bike came...