while putting my new 730 together i broke the middle ring on the piston while trying to slide it in the cylinder. my ? is when the rings break do the shatter or do they usualy just snap into. i was able to get the piece out using a magnet but i want to make sure i got every little piece out of there . the 2 pieces match up but i want to be sure its all out. is there any way to clean it out without splitting the case or taking the motor completely out of the frame?

 

The way we clean out the bottom end on two strokes, is we fill them with gas, then take a suction gun and mix up the fuel for a while then suck it all out. Then we coat the entire crank with two stroke oil before we through them together. I would imagine it would be the same, just once your done cleaning it out, use regular oil of course, and be very liberal with the oil. You just cleaned off all the lube from the crank.

With out being there, I still bet your good to go if the pieces matched up my man.

 

they just snap, dont splinter, but i'd do what viper said just in case

 

Like Viper. . . I've heard of guys using diesel to flush it out. It is oil after-all. Too bad it's nearly $3.50 a gallon! Flushin' isn't as cheap as it used to be.

If the pieces match up, I don't think I'ld worry about it. If it's in the cases it will drop to the bottom. It sure isn't going to get in the crank bearings and no reason to think any pieces would get picked-up and pulled to the cylinder.

Sorry to hear the ring broke. You are definitely taking care of all the negative carma you had out there. When you get this build done, you should have a lot of positive carma headed your way!

 

two tips on installation,

have enitre hole over crankcase covered with rags to keep anything from falling, wrap them up around the rod. especaily useful in saving dropped c-clips.

second, install piston into cylinder on the workbench, leaving the piston out just far enough to slip wrist pin thru at the curved notch in the bottom of the skirt, then bring cylinder/piston over to motor. the rings fit tight enough to hold the piston in place for this, and its much easier I think.

 

thanks guys i apreciate the help. that was an 85 dollar mistake i cant believe my luck lately.

 

No, rings don't splinter. they just break in two. I have had this happen when file fitting rings. That gets expensive when you have to buy to sets of sealed pro moly rings to replace 1 ring. I would say your good to go bro. RUSS

 

yeah, after i dropped my wrist pin down into the lower case, after that covered it will a layer of paper towels, took a while with a magnent to work that sucker out