HEY PLEAS HELP GUYS I JUST BOUGHT A CR80R IT IS A 1980 AND I BLEW THE ORIGINAL PISTON SO I TOOK THE PISTON OUT OF MY DS80 IT FITS FINE AND I THINK IT HAS GOOD COMPRESSOIN BECAUSE IT SUCKS MY THUM IN AND THEN BLOWS IT OFF IS THAT GOOD ALSO THE OLD PISTON HAD 1 RING THE NEW PISTON HAS 2 RING WILL THAT WORK UM I WAS PUSH STARTING IT THE OTHERE DAY AND IT WAS SMOKING AND BACKFIRENG GOOD OR BAD I DONT KNOW IF IT WAS STARTED DIDNT SOUND LIKE IT BUT I WANST PUSHING WITH IT ANYMORE I WAS RUNNING WITH IT GOOD OR BAD AND NOW FOR NO REASON IT LOST SPARK BUT WHEN I HOLD SOME WIRE AND TOUCH METAL THE SPARK RUNS UP MY ARM AND THREW MY OTHER ARM AND THE COIL FLOPS UP AND DOWN IS THAT A BAD GROUND AND WITH THE NEW PISTON THINK WILL IT WORK OR WILL I JUST BE WASTING MY TIME TRYINY TO START THANKS

 

I got a headache trying to read all that lol. Id definately get the right piston for the bike, for that bike probably cheap anyway. What does the cylinder look like? Put the right piston in w/ new rings, compression check. New plug (make sure you have spark, if not its electrical (coil, etc). Then try it again, should probably have fresh gas too.
Good luck

 

I DONT HAVE A COMPRESSION QUID HOW DO U KNOW IF IT HAS GOOD COMPRESSION WITH OUT A GUID

 

WHEN I TAKE THE CARB OFF AND PUT MY HAND OVER THE REED VALVE IT BARRELY SUKES MY HAND IN BUT I CAN STILL FILL IT

 

compression gauges are only 420 for a cheap one. Good investment. ard to tell if you have enough compression to start the bike w/out a gauge. It could blow your finger off the plug hole but still nopt be enough to run.

Put the right piston in, new plug i bet it will start if it ran before and isnt locked up

 

dude u want to sell the bike ill put the right piston in it, and restore it