Suzuki 2 Strokes

Recently acquired a 1975 T500. The previous owner had pulled engine apart and check everything and replaced oil seals. Said pistons and wrist pins seems to be in good order. It starts great and runs well with good power (25 miles so far). However there is a very noticeable clatter or rattle from left cylinder. Using a mechanics rod stethoscope found no lower end noise by the loudest is when the rod is held on the head close to the spark plug; discernibly louder. On switching engine off you hear two pings similar in my experience of T500 with 'normal' ring rattle.

Any suggestions, small end bearing going out or just ring rattle? Otherwise bike goes like a bomb even when two up.

Thanks

Hi
I had similar problem turned out to be piston slap this is what it sounded like
https://youtu.be/WAYLOfNntcA" onclick="window.open(this.href);return false;
A rebore sorted it

Yes I agree with GTandCBR it could be piston slap from a wore out piston/bore. I would start by pulling the head and check the piston to cylinder wall clearance. A way to check for piston slap is to get the piston in question close to top dead center and then push the kickstart with your hand slowly as it reaches tdc you'll hear the piston rock and slap the cylinder as it changes direction. All pistons do it but a trained ear can tell if its excessive by how loud it is. It could also be the wrist pin bearing(small end) but that will usually resonate around the entire cylinder area with a stethoscope.

Thanks for the inputs. I will do as you suggest. I just acquired a warehouse of Suzuki
parts including two big boxes of new pistons and 20 used T500 Engines, amongst a lot of other stuff. Still trying to sort it all out so once complete will pull out the parts i need and get a rebore!
Thanks again.

GTandcbr wrote:Hi
I had similar problem turned out to be piston slap this is what it sounded like
https://youtu.be/WAYLOfNntcA" onclick="window.open(this.href);return false;" onclick="window.open(this.href);return false;
A rebore sorted it

I am looking for a reasonably priced rebore service provider ( preferably local )
How much did rebore cost?
Where did you get it done?
Few local repair shops that I called said they cannot rebore this bike ( 1972 T350 ), so I am exploring my options..

Was piston slap!