power loss

  1. L

    Blow Piston Ring?

    Hey Everyone, Happy Fall! I was bombing down a hill at WOT on a two week old 66cc/80cc bike engine when the engine suddenly died brining me to a complete stop. White smoke was coming out of the air intake. When I pulled in the the clutch to roll the bike back to my house, the sound of the...
  2. L

    No air filter - too lean?

    Hey Everyone, I am constantly tinkering with my first build - I can't seem to get it to run quite right. I am running a YD100 engine with an NT carb mounted to a Mongoose dirt bike. I've recently done some modifications but now my bike runs TERRIBLY. Can't even crack 5 mph on flat ground and...
  3. Yang

    Motorized Bicycle Huge Power Loss Help

    66cc Engine with 8mm stud Ported Cylinder NGK B6HS gap as 0.02 95 gasoline 25:1 mixture Stock muffler, carburetor A couple of days ago, my bike got snowed. And magneto went wrong with moisture, so I replaced it with a new one. But, after my Engine lost power. Before then, I can speed 35-37...
  4. inspectorcritic

    What are Effects of Mixing Synthetic Oil with Regular?

    I just ran a gallon of synthetic oil then went back to regular 2 stroke got a drop in speed to drastick is this the cause or something else?
  5. DuctTapedGoat

    Compression Loss Repair #514

    So I was about to ride and bogged out. Checked seals, checked head gasket and it looked fine and decided to check piston rings. But what is this embedded in my head? Looks like a piece of roller needle bearing from the piston! Further investigation. Jug damage, piston damage...
  6. P

    Engine Trouble Engine bogging at low rpm then possibly runs lean at high rpm

    Alrighty where do I begin. I finally got my bike out of storage for the winter a month ago (it has a Grubee Skyhawk GT5A installed) after giving it the once-over twice I got it running nicely, no problems for the first couple of tanks running at a 25:1 ratio. After letting it sit for a couple...