QT 50 over bore kit

Has anyone seen a kit for the QT 50, or similar engine ( i believ that the PW50 is the same engine) to over bore the cylinder, and fit a new piston?

Ive ended up with a scratch in the cylinder, and piston about a mm deep.... and a new cylinder and piston is cost prohibitive...

Re: QT 50 over bore kit

I am sure that the Yamaha dealer can order you a "1st over" piston right from Yamaha.

Probably $35 for piston and rings... and $30 to get it bored.

But before you order the piston... let the "bore guy" look at the cylinder and tell you if it will 'clean up'.

Re: QT 50 over bore kit

Fred wrote:

>

>

> I am sure that the Yamaha dealer can order you a "1st over"

> piston right from Yamaha.

>

> Probably $35 for piston and rings... and $30 to get it bored.

>

> But before you order the piston... let the "bore guy" look at

> the cylinder and tell you if it will 'clean up'.

I asked the mechanic there, and he said no, it wouldn't clean up, as you say, but I wonder if he was assuming I used the same size pistion, as he said he could only bore 1/2 mm....

You know anything about this? Could I just take it to a machine shop, and say, make is smooth again, and then fit a piston to it? or are there standard sizes to bore up to, and then get a standard pistion to match the new bore size?

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