Exhaust port 3/4"×1 3/8"
2 1/4"from skirt to bottom of port
1 1/4"from top of port to top of cylinder

Exhaust port 3/4"×1 3/8"
2 1/4"from skirt to bottom of port
1 1/4"from top of port to top of cylinder

Thanks
looks like I got it
I am impressed on how well mapped out this cylinder is
Worked on all kinds of bikes and snowmobiles over the years but the fit and finnish on these engines is something I haven't seen for awhile

Has anyone done a port map on a 125cc
Just wondering how close my measurements are to any one eles
It's not often that I do a port map

Ok thanks everyone
Any kind of information always helps

The piston is 30thou over bore stamped right on the piston the cylinder has a plus 7 marking on it
Stamped on the machined surface of the cylinder where the head gasket sits

I have a funny triangle with an h in the centre stamped on the top of the cylinder along with a +7
No one seems to know what they mean

Thank you very much for the information I was not sure if it could be done and yes getting the bike back to street legal is the goal
I had never seen these bikes before other than a bit on the jay leno you tube page
untill this fall when one was brought to my shop

New here I'm working on a 73wombat 125
The stator windings are shot and the mag is in rough shape just wondering if any one has done these conversions