1. S

    Motor good at half throttle but bogging at full??

    Kind of lost as to what’s going on, I have a reed valve + windowed piston on a 80cc 2 stroke engine. I’ve got an HP carb with a #70 jet installed. I can ride the bike and when I first start riding the idle is fine but when I get it going to WOT and then come to a stop the idle is really high. I...
  2. T

    Porting questions

    I'm about to buy another 100cc 2-stroke engine and I'd love some input on proper porting. After doing tons of research I think I'm going to: Widen exhaust and intake port 1mm, raise exhaust 1mm and lower intake 1mm. Trim piston skirt to clear intake port at TDC. Will this configuration mess up...
  3. T

    Fuel/carburetor issue please help

    Okay so been working at this shitty Niome 100cc kit for over a week can’t get it running think i’m onto something though finally. The bikes been bogging extremely hard and hasn’t gone faster than 5 kms and it doesn’t get uphills. Tried sealing gaskets with RTV to eliminate possible air leaks...
  4. L

    Climbing hills, real ones.

    Howdy, 1st post and happy to finally join! Wasn't sure where to post this, as I'm new, but here we go. I've been interested in making a fresh hill climber for hiking/mountain bike/dirt bike trails. I am chill as a cucumber if I can't go faster than 25mph max speed, as I know with these...
  5. Tom74

    Muffler gasket

    I recently purchased an 02 toyota highlander oxygen sensor gasket as a gasket for my muffler because some guy on YouTube recommended it, but what I'm wondering is it for 36 or 40mm stud placing. Is there anyone that has bought one of these and that can measure it for me?
  6. N

    Hello from UK

    Hi folks, New to here so thought I would say hello. I got myself a pretty awful $90 chinese morotized bike from banggood and I'm trying to fit it to a 18in Kona Hanana frame.I'd appreciate some advice - although I've managed to overcome some problems, I'm struggling with the chain rubbing on...
  7. W

    [80cc] Pops and Bangs?

    Hello. This is my first post on this site so any help would be great! I am looking to get more pops and bangs out of my motor just for fun. I have done a little research, and what looks like the only way to get them is to change the timing on an adjustable CDI, which no one sells. The only...
  8. breath_easy13

    Fat tire Build

    Hey, new to the site, fairly new to building bikes. After lots of reading I've decided to go with a motorized fat tire bike. I wanted more of a cafe racer look, but i also want fat tires, and the old cruiser type mountain bikes just dont have fat enough tires. anyway, heres the build. Also...
  9. G

    Would someone help me please? Throttle Assembly...

    I just bought a kit and decided to install it on a new bicycle for myself. I've instalked for people but never owned a motorized bicycle. My question is about a throttle assembly. I bought a new Scwinn Solara road bicycle and it has the curved racing numerous speed handlebars on it. Picture is...
  10. O

    Clutch making strange noise while engine is idling [Video]

    Hello everybody, I'm pretty new in this community so please don't blame me too much :D So let's get started with the problems: When i start my engine and i pull in my clutch i start hearing some fast banging noise(not really sure how to call it) coming from the clutch plate side. And when I...
  11. carl clack

    Pk 80 Baby

  12. 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...
  13. carl clack

    Porting First Time No Problem?

  14. Quintin

    2 stroke 80cc bike not running well

    about a year ago, i built a 2 stroke 49cc kit. ran excellent, no problems. at least until the engine seized. bought a new engine last week (80cc), installed it, got it running, but it doesn't run well at all. the only thing that has changed is the engine. when i rotate the idle needle on the...
  15. J

    Chain Alignment issues. Chain keeps breaking.

    I have the Aurelio Tech 80cc 2-stroke motor kit for my mountain bike. Everything has been just fine except for the chain. Originally I had the tensioner way too tight and of course the chain snapped. Luckily it just broke the master link. So I ordered a Chain Link Remover and fixed it...
  16. J

    I've done everything and still no start

    I got a 2 stroke, 80cc kit a couple weeks ago and built it in a day or so but for the last 2 weeks I have been trying to start it almost everyday and I get nothing. I pedal, get some speed, ease on the throttle and pop the clutch and there is not even the faintest semblance of engine combustion...
  17. O

    Engine not starting, despite good spark

    My 80cc engine from China (eBay) has not started since it was assembled a week or two ago. Fuel is getting to the engine, as the spark plug was wet when checked after cranking - for some reason it refuses to burst to life upon releasing the clutch. The engine will turn over after releasing the...
  18. L

    No start up on a 80cc engine

    I have a spark, and the piston moves when I pedal with the clutch untouched. It sound like it wants to start or that the piston is moving extremely fast either way no start. I've been trying different things going on some forums. I've replaced the magneto, cdi and spark plug. Although I the fuel...
  19. J

    What 4 stroke for my first build?!

    Hey there, I'm looking to make my first build on this frame http://www.gasbike.net/collections/all-bike-frames-wheels/products/copy-of-gasbike-aluminum-bike-frame-with-built-in-gas-tank and i want to put a 4 stroke on thats over 50cc because I live in a very hilly area. I'm looking at the...
  20. Solmangrundy

    Need help identifying this engine brand.

    haven't heard back from the guy i bought it from yet, wonder if anybody on here might know what specific brand this motor might be. it has 3 wires coming from the magneto, a curved clutch arm, short intake, and flat head case screws that would make it "unique" to who manufactured it. My other 2...