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4 stroke

  1. Danaman117

    49cc 4 stroke redlining at 15mph..

    I have a new 49cc 4 stroke 5g with dual chain automatic transmission. The gear on the mag rims is a little smaller than the standard bike kit sproket but with my 2 stroke i was going 30 easy with the same gear.. its like I have one speed very powerfull on start actually wants to pop a wheelie. I...
  2. G

    4 stroke keeps stalling

    Hi guys. New to everything motorized bikes. Just finished building this about a week ago. I've looked around, but can't seem to find an answer to why my 4 stroke keeps stalling. I uploaded a video of what happens. As soon as I let off the throttle, it stalls out. And I've pushed the idle screw...
  3. C

    How to set up 4 stroke carburetor - what do these hoses do?/how do I hook up these hoses on my engine

    Hi, I am new to building motorized bicycles, but have been doing fairly well following the instructions and finding information for my first build, but I have been unable to find information regarding the carburetor for my engine. I have added pictures with my questions, I hope they will be...
  4. 79cc 4 stroke huffy Cranbrook

    79cc 4 stroke huffy Cranbrook

  5. 79cc four stroke Cranbrook

    79cc four stroke Cranbrook

  6. Idlandz

    Almost giving up on my first 4-stroke build

    So last summer I saw a video about a motorized bike build on YouTube. Seemed simple enough. Just slap that old 4-stroke on there and bam, cheap motorcycle. I found my dad's old trash mountain bike and bought the standard Huasheng 4-stoke all in one kit on Ebay. After putting everything...
  7. IMG_20190420_095932810_HDR.jpg


    4 stroke ebay kit
  8. B

    A bike for finding tarantula and snakes.

    Hey guys, I live in a town called Surprise Arizona, its a far northwest suburb of Phoenix. From my house I can drive 10 minutes (in a car) and be into the desert. I currently only have a car and I'm looking to build a bike that I could take down dirt roads to look for snakes and tarantula to...
  9. panmines

    Did I ever show you all how clean my 212cc predator build came together?

    About a year ago I needed to build a tough off roader bike in order to support my true passion hobby of exploring abandoned mines, many of which have derelict roads/paths leading to them perfect for motorized biking. My goal was to create a simple and lightweight off-road bike with lots of...
  10. J

    Best 4 stroke kit?

    I need a 4 stroke kit that can handle slight inclines.. will be used as a commuter bike for a mile ride between campuses and around town. Looking for under 500$.. preferably 300 max. Bike is hard tail steel mountain bike with 17" clearance between bottom and top bar on a 28"(27.5?) wheel with a...
  11. B

    Noob with a 4-stroke engine problem... help a brother out?

    Hi All, First time post here... my 4 stroke engine is having a weird start up issue for a new bike.. I've found the noise, identified the issue, buuuuuuuuut I don't have any experience with tools whatsoever. Here is a link to the...
  12. D

    Exhaust system for 4-stroke

    I have a huasheng 49cc 4-stroke engine on my bike and it has the standard exhaust that comes with it. I would like to "Upgrade" or change it out for another better looking and better performing exhaust system. I want it to go all the way back to the middle of the rear wheel and have a better...
  13. B

    Bikeberry Builds Complete Motorized Bike Giveaway

    Welcome to BikeBerry Builds! The show where we take new or old bicycles and overhaul them with the latest engine kits and performance parts. But that's not it, don't miss out on this awesome opportunity to take home your very own Micargi Pantera Motorized Bike Build because at the end of the...
  14. RocketJ

    Gas and brake pedal

    So here's an idea. Most older motorcycles have a foot brake. What if i were able to attach another pedal next to that brake and wire it to the carb, creating a gas pedal? Aside from being a bit wider, i think it would work pretty well. What are your thoughts?
  15. A

    Centrifugal clutch 49cc

    I’ve been looking for a solid company to buy a 49cc centrifugal clutch engine kit. Any suggestions please leave links or names please also do they have engines with electric start just curious. Drop best bikes to possibly buy to fit the engine thanks
  16. RocketJ

    Running a 420cc predator in upright position

    Is this something that can be done? I've heard that predators suffer from oiling issues if operated in an upright position.
  17. Will'smotobikes19

    Miniature v8 or v6 on a bike?

    Time for another think tank on these ideas I have lol jk. But I saw a homemade 394cc v8 bike on youtube made by a guy named Dennis Franz. He made the aircooled beast by hand without any plans of course his didn't have pedals and I don't really think there would be any room for pedals either. HE...
  18. Will'smotobikes19

    GX160 bike

    Hey guys I just was wondering what you think about building a gx160 motorized bike. I saw a vid on youtube of a kid passing cars on a bike with a gx160 and apparently he can go 50mph! Thats as much as a 212cc but with smaller displacement of course he did remove the gov but I think they do make...
  19. Will'smotobikes19

    First ride on 79cc predator

    Hey guys I rode my latest build for the first time today and ran into a few problems first problem was the motor seemed to be shaking for some reason and then I always had to pedal to get the bike going or it will just vibrate the whole bike violently I dont know if its the way the throttle is...
  20. Will'smotobikes19

    My 79cc predator bike

    My 2nd build a hf 79cc on a micargi predator with front suspension, 180mm front disc, American 5/16 bolts on the motor mount and chain tensioner, Italian made #415 chain, NGK bp5hs plug, wrapped exhaust, cnc 40 tooth sprocket, rear coaster brake, 3L gas tank, cnc grips/throttle.