4 stroke

  1. C

    4 Stroke Engine, Bike basically takes off when started

    I have a four stroke engine on my motorized bicycle. The engine and the bike rode just fine, until it was dropped. when the bike is now started from pull start, (hence it’s a 4 stroke) the rear wheel is spinning without giving the motor any gas. the bike is basically stuck in gear????
  2. 4 Stroke Bicycle Ride 3 (8 miles of 30mph Non Stop! --Almost Got Robbed!--)

    4 Stroke Bicycle Ride 3 (8 miles of 30mph Non Stop! --Almost Got Robbed!--)

    #MotorizedBicycle First long ride on the 4 stroke build! I ran 30mph non stop on the beach roads!
  3. M

    No bt80 electric starts anywhere

    Can someone help me find where the bt80’s are or what happened to them, i cannot find a single one to buy. I want a second bike build with a centrifugal clutch, and preferably electric start. Also considering 4 stroke but I dont know quite yet and i live in an area with lots of hills, would a 4...
  4. U

    Flat Track (type)

    Hello everyone, Finished this project on 25th April 2020. Started 06th October 2019 with an idea, get a motorized bicycle that could look like: - Flat Track - Board Tracker - Speedway I started the flat track project because of the bicycle type that came up. Bought a cheap bicycle, the 4 stroke...
  5. M

    4 stroke bike clutch wears out after less then 10miles!

    Hello everybody, I’ve recently bought a 4 stroke 49cc engine kit for my bike. Everything went well building it, but after my first ride, which was less then 10miles, my clutch completely broke down(I’ll attach pictures). I replaced the clutch with a brand new one, but after taking another ride...
  6. T

    Phatmoto 79cc bike

    Bought this bike and after a little struggle it is up and running. Still need to make some mods happen and tweak a few things, but I think I'm going to like it.
  7. S

    4 Stroke engine muffler issue.

    So I'm trying to put the exhaust on and unlike the engines in many of the tutorials I see, there are these stock bolts that comes out. I'm not sure if I can remove them. Edit: HuaSheng 49cc 4 stroke engine
  8. A

    What up yall ! Im Collie

    Im new to riding with a small engine and having a grand ole time with it... i recently bought a used huashengtaishan 38cc 4 stroke which i mounted on my mountain bike with a friction drive kit and all was fine and dandy until i changed the oil. I followed the instructions on the sticker which...
  9. B

    Bikeberry Builds Complete Motorized Bike Free 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...
  10. U

    Questions...Bought a used 49cc 4 stroke kit

    Ok so I'm new to this but have been repairing and tinkering with stuff for years and I'd say I'm mechanically inclined. Picked up this kit, originally meant for a frame mount, from a guy on Craigslist for $80. I am trying to figure out which make/model kit I have here, any pro's & cons of this...
  11. RocketJ

    Merkel Motor Wheel?

    I've always been facinated by Joe Merkel's Motor wheel design. I've studied the patents, but it's still difficult to udnerstand how a hub based engine works with a coaster wheel. I found this restoration build, but still no dice. Anyone have an idea? I'd love to give this a try with a more...
  12. AttackCadillac

    4 stroke engine seized?

    Hello everyone, I recently put together a 49cc 4 stroke kit I bought online and after about an hour of off and on use the clutch exploded. After buying a new clutch I put it in and after a few more minutes of riding the engine started running REALLY rough. I left it in the shop for a day and...
  13. 4banger

    New Huasheng won't break 22mph, why?

    I'm having an issue with my huasheng 4stroke stock with 44t pinapple rear sprocket. Old one was great, hit about 28-35mph on the regular, slight knocking once in a while on inclines. New kit won't clear 22mph but runs smooth. Would like to hit 30 again though. First, everything ,bike and all kit...
  14. L

    Friction drive kit questions

    Hello everyone i had a question for anyone who can touch up on the subject. Im new to 4 strokes and im buying this from bike berry soon. This is my first 4 stroke and my first friction drive and i was woundering what i can do to improve the size of the tank as well as keep my tires from balding...
  15. Patchy

    Unused modded 212cc engine

    I have an upgraded 212cc engine that didn't pan out with a motorbike project. I have no idea what to do with it. Anyone have any ideas what I should do with this thing? Its one **** of a paper weight... (Mod 2 cam, 18lbs springs, cnc connecting rod, cnc fly wheel, governor removal, bored carb)...
  16. H

    My Micargi Rover GT build

    Hey guys just wanted to show off my Micargi build which will be holding a 49cc 4 stroke with a 4G T belt. Right now its just for looks because I got to find a good way to grind down the front engine mount and go through and thread lock all the bolts and grease the bearings better add a gas tank...
  17. Patchy

    212cc build!

    Hey folks, its been awhile since I've been on the forums but I have some news! After selling my motorcycle I started a new motorbike project! My other builds were with the China Girl 2 strokes and I wanted to move up in the world so I decided on a Predator 212cc engine. My friend and I went...
  18. A

    New From NC!

    Hey guys, Im new posting here but a long time lurker. I have built a fat tire motor bike but have difficulties with getting it to actually go with me on it. I am large in stature but low in weight (6'4" @ 170lbs) I have posted many pictures of the build plus added a question in this forum...
  19. A

    Custom Bike Problems

    Hey! I am building a fat tire (mongoose dolomite) custom frame and gas tank bike. My mandatory specs were that it had to have disc brakes front and rear, 4 stroke motor, and shift with no manual clutch (shifter kit from Bike Berry). The problem I am having seems to be that the 49cc motor (also...
  20. D

    Help Please, mounting 4 stroke to Micargi stretch

    Howdy folks, I'm a mechanically inclined noob and I'm afraid I'm gonna be full of questions over the next month or so. I'm an old time schooler that likes his ducks in a row before beginning a project. I wish to motorize my Micargi Puma and will do so using a 4 stroke kit. I read...