motorized bike won't start

conor mitnick

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10:59 AM
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Apr 26, 2016
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I have my motorized bike and jut struggle to get it to start. I checked everything have compression spark and fuel going. So that's not an issue I try choke and it pops. Just doesn't start. It runs sometimes but then gets hard just changed the cylinder plug and piston and rings all new parts. Also goes very slow when it gets hot too. Sometime that happhens as well. Very weird. Can't figure out why. I checked carb its clean and float is where it should be. Appreciate the feedback guys thanks
 
not all cylinders fit all motors - also, sometimes when ordering pistons they send oversized because they think it will go in a used cylinder (numbers stamped onto top of piston indicate what oversize they are)
 
not all cylinders fit all motors - also, sometimes when ordering pistons they send oversized because they think it will go in a used cylinder (numbers stamped onto top of piston indicate what oversize they are)
So how do you order the correct piston? Most dealers don't know what the numbers are for, where do you order from?
 
oversizes are not that much - each number is only about 20micrometers over, so you can get all the way up to a #4 piston before you get up to 3 thousandths of an inch over - I rarely do a top end for a customer since with labor it is better to just shove in a new motor

when I do order pistons, I read the number, and hone off a thou or two from the cylinder to help match up the piston
 
I do use 50:1 ratio usually I always mix a thicker oil mixture. I would rather replace a plug then another motor. Now my friends bike seems to lock up when clutch is released like its acting as a brake now I don't know why. Also question off topic but what would a fair price to sell these bikes at and what is the best way to advertise them thanks.
 
It seems like with the 2-stroke bikes they are selling for around 500-600 dollars here in Montana. The best way is typically Craigslist in order to get the word out that you have something for sale.
 
I do use 50:1 ratio usually I always mix a thicker oil mixture. I would rather replace a plug then another motor. Now my friends bike seems to lock up when clutch is released like its acting as a brake now I don't know why. Also question off topic but what would a fair price to sell these bikes at and what is the best way to advertise them thanks.
50:1 is actually pretty light and with new piston and rings you may want to go 25:1 for the first tank in order to give proper lubrication to the rings.
 
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