Poor gas mileage 2013 christini 300 with gasgas ec300

[Neil E.]

Have you measured the squish yet? You can do it through the plug hole if you are very careful. Use a long piece of solder and feed one end out to the cyl wall. Feed the other end to the opposite wall. This will leave a big loop out of the plug hole to hold on to. Rotate the flywheel as described in the article. The method in the article is the best way, but through the plug hole will give you an idea of how bad it is. If it is way out, then use the aticle's method before sending it off for machining.

http://www.gasgasrider.org/html/measuring_squish.html