scored piston, cylinder

edoggdoremus · Post by **edoggdoremus** » Sun Apr 08, 2007 9:56 pm

for about 8 months now my 1986 spree has been sitting in my garage, unable to start (30psi compression). I finally took a look inside, and found a scored piston and stuck piston rings. The jug also has some scoring and little bits of metal too. Piston is worthless now i'm guesing, but is there a way to salvage the cylinder? or do i need to replace that too.

thanks.

ps: anybody have the parts i need?

Kenny_McCormic · Post by **Kenny_McCormic** » Sun Apr 08, 2007 10:06 pm

the cylinder can probably be saved with honing depends on the severity of the scoring if you found bits of metal then you need to remove the engine from the bike and split the casing to get ALL of the shavings out

burnt_toast · Post by **burnt_toast** » Mon Apr 09, 2007 12:48 am

Kenny_McCormic wrote:the cylinder can probably be saved with honing depends on the severity of the scoring if you found bits of metal then you need to remove the engine from the bike and split the casing to get ALL of the shavings out

yeh indeed. and if you can feel any "grooves" in the cylinder scoring, then you'll need to replace that too. otherwise either hone or some wetsanding should helpt it out.

www.scootertherapy.com is a good place for spree cylinders, got a used one back in the day from them for like $25.

hrnytrtlsgsxr · Post by **hrnytrtlsgsxr** » Mon Apr 09, 2007 3:33 am

you might be able to flush out the metal flakes with gasoline and such but it is not a sure gaurantee way of all the metal getting out.You can use miuratic acid to help take out the aluminum from the inside of the stock bore. but watch out cause it's not good to breathe and is hazardous. IMO using wet sand would increase your chances of blow by since you are deforming the bore.

edoggdoremus · Post by **edoggdoremus** » Mon Apr 09, 2007 3:41 am

yeah i went back and looked more closely at the cylinder and there are definitely grooves of scoring in it. thanks for the help. found a really cheap parts bike on craigslist, so hoping it has a good cylinder and piston.

by the way, what would have caused such bad scoring all of a sudden? Broken oiler? It worked fine before the fateful day when it just died on me.

Kenny_McCormic · Post by **Kenny_McCormic** » Mon Apr 09, 2007 3:52 pm

something could have got stuck in the carb leaning it out

Gamemedic · Post by **Gamemedic** » Wed Apr 11, 2007 10:42 am

Take the jug to a motorcycle shop and get it bored and matched to a new piston. Although I dont know if they make a .10 oversized piston for a spree.