4 stroke

  1. 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...
  2. 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...
  3. 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...
  4. 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.
  5. Will'smotobikes19

    118cc lifan build

    Hey guys first post on here I was intrigued by the idea of using a lifan 4mhp engine and was wondering if anyone knows anything about it. Is it a Honda clone? Can racing parts be used in it? (Gx120 parts) I already know it is a 0.75 in or 3/4 shaft. It may be possible to use the 79cc...
  6. RocketJ

    4hp cruiser progress

  7. RocketJ

    4hp briggs cruiser project

    We finally hit a break in the weather in upstate New York, so I took the opportunity to work on my btr/powerplus bike. This bike originally started out as a sportsman flyer with a cheap china girl slapped on, but I soon realized that it just wasn't doing the bike justice. I ripped out the old...
  8. RocketJ

    In need of a belt drive shifter

    Hey guys, I'm looking for a shifter similar to what you would see in indian powerpluses or very old belt driven harleys. Arien snowblowers have a nice speed shifter but there are none for sale cheap near me. I live in new York's capitol region. If you have one please let me know.
  9. C

    My motoped Frankenstein

    So ive been reading these forums for years for insight into my builds( ive done 6 or 7 66cc 2 strokes) but i have had more issues than i care to think about. Mostly needle bearing failure, and a couple stripped crank studs. So ive been debating a four stroke build like a 79cc predator but for...
  10. RocketJ

    Let's build a morgan 3 wheeler?

    I'm sure you've seen it at some point on tv or the internet. A 3 wheeled, v twin powered trike with a hundred year old history. Usually, these beautiful machines would go for 30+ grand, but what if they were built out of bicycle parts instead? My idea is to use a 212cc predator, 2 front...
  11. H

    79cc predator build.

    Hello, I am looking to build a 79 cc predator bike. I will be using the EZ matic transmission for the build. I think I will be using the gas bike motor mount, unless you guys/gals recommend a different mount. Some questions I have about the 79cc hf motor is. What's the rough mpg like? Will...
  12. B

    best oil for a 4 stroke

    I have a huasheng 4 stroke and I'm trying to figure out what oil to use can someone help me out here
  13. CrazyDan

    7/8" flex pipe for 4 strokes

    I found a cheap source for 7/8" galvanized flex pipe for exhaust sold by the foot...
  14. RocketJ

    3 hours later and this old beaat is almost ready to run

    Thanks Curtis fox for the beautiful donor engine.
  15. M

    Loud dry clutch on Monster 90

    Monster 90 build works great, but the automatic dry clutch on the left side whines loudly! Is this normal, or is there some adjustment I need to make?
  16. RocketJ

    I want to install a suicide clutch on my 79cc predator build

    I love the 1910 era of bikes. Board track racers are my favorite and I plan on revamping my existing BTR build to a more authentic style with a 79cc predator engine and proper clutch system. In addition to the engine swap, I want to try my hand at installing a suicide shift (pulley clutch). As...
  17. RocketJ

    Suicide shifter on 79cc predator

    Hi all, long time lurker and builder here. I plan on upgrading my boardie from a chinakit to a 79cc or 212cc predator. I love the old suicide shifters and was hoping to implement one into my build. Is there any replacement for the centrifugal clutch so i can just run a pulley wheel and shifter?
  18. linuxvorpal

    4-Stroke Always Engaged

    I just bought a kit from bikeberry and I put it together, engine runs but the spindle is always spinning. The clutch is always engaged. I thought it was supposed to be a centrifical clutch. Did I miss something?
  19. MBikeRider

    For Sale $55 Used Staton Inc. Friction Drive 1" Roller / 76mm Clutch Rotor / 78mm Clutch Drum

    Hello, I have a used Staton Inc friction drive for sale. It's missing a few small nuts and bolts and has a few holes drilled on top for the gas tank mount, but is otherwise the full kit. PM if interested. Reason for Selling: Used it for a hard 6 months, but my 49cc HS 142 engine broke from over...
  20. cmb271

    Nut size for 4g transmission rear sprocket

    Hey everyone, I'm in the process of rebuilding the 4g transmission for my 4 stroke after the bolt that held the 10t rear sprocket fell off causing a domino effect of transmission failure. I got another sprocket but I don't know what size nut goes on the threaded shaft, anyone know?