engine problems

I recently built a 100cc motorized bike, after completion it ran and rode good. After one of the first short rides I shut off the engine. I go to start it again and it locks up the back tire and barely turns over. The engine turns freely in reverse and with the spark plug out. It acts like the...

Okay so I have a G series 2 stroke 80cc motor, when I go to try and stop cause as of right this minute I don't have brakes so, what I do is let go of the throttle all the way and I'll push the clutch in, but when I go to push the clutch in all the way, the engine revs really high and this is...

Hello Motor Bicycling.com I'm Matt, a new member to this forum, however I've been working at this motorized bike for close to 3 years now and I've only got it running a hand full of times unfortunately. First a little bit of background about the bike. I first purchased the Huasheng 4-Stroke...

Hello everyone, I just purchased a two stroke Schwinn Stingray OCC off of a gentleman this week. It's used and has been through three owners so far but the last guy didn't ride it as much as he fixed it from the previous owner. I am completely new to motorized bikes so I really don't know...

Hey Everyone! I hope you can help me out here...My bike has a NT Carb that was a solution to a problem with my original carb from the bike kit that I got on ebay. The bike was working really well, but I got a nail stuck in my tire...replaced the wheel about a week later. I go for a ride and...

ok, so, i have built my second engine on a bike, the first one was with a friend on his bike, everything went fine except the carborator filter kept falling off. i built my bike on my own with a little hole drilling help from my girls dad. And my bike is solid no problems at all, everything is...