1. 2

    Carburetor keeps spewing gas due to stuck float?

    hello, I’m new to this website and don’t know if this is where I post so if it isn’t please direct me to where I should post it I have a cheap Chinese 80cc 2 stroke with a “speed” carburetor (the one with the red filter cap instead black). After driving it for a little it stopped working and...
  2. W

    4 stroke engine question

    I just installed a 49cc 4 stroke engine onto an old mtb I picked up. This is my first 4 stroke and I'm wondering how to fill it up with gas. The engine has a dipstick for oil, so does that mean I don't need to make a mixture? Just add oil in the dipstick and gas in the tank? When starting I...
  3. 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...
  4. C


    When my bike backfires it shoots flames!!! Is there a proper way to make it do it whenever I want because it's really cool?
  5. I

    Ready to throw the keihin away

    Here's what I got. This thing never ran right from day 1 and I'm tired of it. Do I spend the money on a jet kit or is there a carb I can buy that would be as big as the keihin that will actually work? I finally have my low end rpm smooth and powerful, but when cracking wide open after that...
  6. M

    No fuel in chamber

    First time bike build. I put everything together correctly but I cant seem to get fuel into my chamber from my carburetor / intake. I took off and am looking through the intake tube between the carb and the cylinder head. I can see my piston moving up and down as spin the wheel, but it wont go...
  7. L

    Engine Troubleshooting

    Hi everyone, I've been having some strange engine issues and would appreciate any insight from some more experienced engine people. For the last 2-3 months, my bike has gradually gotten slower - lost pickup on the low end and lower top speed on the high end. I haven't changed any major...
  8. M

    Fuel tank sizes?

    I am thinking about getting a larger fuel tank, which will help me not worry as much when going long distances, and I won't have to fill up as often, but I am currently getting about 25 miles per fuel tank (I believe I have a 1.5 liter fuel tank on my bike). So, I was wondering, are there any...
  9. M

    How to know when broken in? Fuel ratios?

    I probably have about 30-40 miles on my bike so far, and have been using a 20:1 gas to oil fuel ratio with non-synthetic 2 stroke oil, I don't know if it is meant for air cooled engines or not but... don't know if that matters but I'm sure it helps. Anyways, I wanted to know how do I know if my...
  10. M

    How do I change fuel tank?

    How do I change my fuel tank without fuel spilling everywhere when I take off the fuel line/ petcock, even if I turn of the flow of fuel on the petcock, there will still be fuel in the line running into the carb, how do I go about doing this?
  11. M

    Newly built bike won't start, help?

    Here is my story... I have put my Chinese 66cc motorized bicycle kit on my mongoose mountain bike. Unfortunately, the regular chain that you use to pedal broke, and I have yet to replace it, so pedaling is not an option for me; but, I do have a pull start installed, which I have been pulling and...
  12. C

    gas guzzler?

    i filled the half gallon tank a few days ago, and since have gone maybe 20 miles probably alot less. but the tank is almost empty. the only thing i can think of that is unusual is that i had the fuel valve pointing in the opposite direction from on, i thought this was also on. why is my engine...
  13. C

    Proper Riding

    is it safe or ok to ride an 80cc bike motor at full rpm even at a 16-1 mix?
  14. R

    almost closed petcock gives me more power

    ok, i've been having trouble with my motor. i got it about a week and a half ago, i've been through a total of about 5 tanks (my tank is a half gallon size). and i've maybe been topping at 17MPH, and then it slowly loses power until it maybe maxes 10 mph without me pedaling. i've been thinking...
  15. H

    Carb Trouble

    I am having trouble with fuel, and so I think it is the carb. When I turn the petcock off it goes like spit....until the fuel runs out. Then When I turn it back out I bog down to maybe 10 km.
  16. M

    Interchangeable Gas Tank?

    Is it possible to use a motorcycle fuel tank for a bike? It seems 1.4-2.5 liters is the norm for a tank, is there anything special on a 2.4L bicycle fuel tank that isn't on a 2 gallon motorcycle gas tank? Is there any kind of modification I could do to the gas tank to work with a bike engine?
  17. J

    66cc China Girl Motor runs too rich at low throttle, can't adjust anymore!

    Hi eh! Just got my China Girl ticking, it uses the stock exhaust and NTTC (NT?) carburetor with stock air cleaner, the square black plastic one. I'm using the stock 10-tooth engine output sprocket and 44 tooth rear sprocket. Initially, it ran extremely rich. It wouldn't even fire at all...
  18. S

    Different type of carb problem.

    Hey all, I'm new here. I bought a used motorized bike from someone nearby off of Craigslist and I've had nothing but problems since then. Luckily the man also included a box of parts, among which was an entire new engine assembly, chain, tubes, etc. My brother found a nice mountain bike and...
  19. T

    Fuel in air filter and carby problems :s

    I am a beginner when it comes to engine kits. I bought a 66cc two stroke Chinese generic brand kit, and I upgraded the carb. My old carb died on me so I bought a new one. Both of the carbs had the same problem though. The fuel ran through the carb but the air filter also got drenched in fuel...