Subject:RE: engine locks down and refires Date:Mon Jun 8 22:50:46 2015
Response to:20538
hello David
i'm no expert, but i had the same thing occur to me several times with my 175cc '65 pacer 4 yrs ago. for me it was a wore out piston and incorrect size rings from who knows when. i had to have it honed twice (the second time was at a local go-cart shop) to get the coke bottle shape out of the cylinder. also my first attempt at putting the cases back together had several leaks. after the second hone i had the shop put the cases together and a leak down test showed their skills were above mine. after patient breaking in it has gone over 4000 miles.

New here and with the hummer. I have a 59 and when I ride for a few miles at 50+ mph it will lock down and slide the rear tire. I can immediately pull the clutch in and kick it and fires right back up. If I ride at lower speeds it runs fine with no trouble. Any ideals? I run the 25:1 oil mixture. As I read thru the site it looks like years of experience here. I have already used a lot of info from this site to get it running. Thanks to all !! Also, how do I know if it's a 125 or 165 motor.

Thanks for everything guys