Broken piston ring.

fujioko · Post by **fujioko** » Wed Jul 05, 2006 10:09 pm

Thanks all for the help in the previous post. Here is something interesting..

Anyway the $40.00 Spree ran well. So I put in a new battery and rode the bike around the yard and in the street. The max speed was about 25 mph however it had trouble going up a slight incline. The speed would drop to zero!.

I read up on the tech stuff and decided to decarbonizes the exhaust.. sure enough it was more or less plugged. I put the exhaust in the barbeque and stoked up the coals. 14 hours later the exhaust crap was burned out.

I also cleaned the exhaust port.. being very careful not to nick the piston. Gave the carb a quick clean. And put the bike back together. Awesome performance the bike ran like new.!

The next day the bike wouldn├óÔé¼Ôäót start. I checked the compression and it was only pumping 30PSI. Off came the engine and I pulled the head and cylinder to check the rings.. sure enough the second ring was broken. Very odd.

I ordered up a ring and gasket set the bike should be running within a week.

Any theories as to why the ring broke?

-aL- · Post by **-aL-** » Wed Jul 05, 2006 10:39 pm

how many miles are on the bike?

fujioko · Post by **fujioko** » Thu Jul 06, 2006 6:54 am

The bike had just over 4000 miles. Judging by the lack of tool marks on the fasteners, it would appear the engine was never rebuilt.

-aL- · Post by **-aL-** » Thu Jul 06, 2006 11:37 am

that would explain it

85stroka · Post by **85stroka** » Thu Jul 06, 2006 12:19 pm

Or a piece of carbon got stuck and made the ring hang up?

berreta22 · Post by **berreta22** » Thu Jul 06, 2006 3:38 pm

mine blew at 4500 miles so its common

fujioko · Post by **fujioko** » Thu Jul 06, 2006 10:03 pm

Well it would appear that my Spree fits the profile of a high mileage engine failure. The good news is the parts only cost $35.00.

Yeah, I had to stand in line at the cycle shop.. All these tough guys ordering up parts for real motorcycles├óÔé¼┬ª and then there├óÔé¼Ôäós me├óÔé¼┬ª ├óÔé¼┼ôplease may I have piston rings for my wimpy little scooter├óÔé¼┬Ø

Sometimes the fun is not in the raw power, but how you use what little you have.

MySpree · Post by **MySpree** » Thu Jul 06, 2006 10:04 pm

i always accidentally do somethign to blow mine...

darat · Post by **darat** » Sat Jul 08, 2006 8:02 pm

thats b/c u dont know what u are doin

MySpree · Post by **MySpree** » Sun Jul 09, 2006 12:35 am

no, the spree was the only one i blew, and that was due to a cir clip comeing out.

darat · Post by **darat** » Sun Jul 09, 2006 12:39 am