Quote:
Originally Posted by Fred1956
IMO a 200 doesn't pump as much air as a 300 so it should be leaner........I'd start with a 42 PJ & 172 MJ and go from there. First obvious sign of low compression on a 2T engine is hard to start. Check the jetting sticky in the carb section, someone will have 200 specs in there as a starting point- http://www.gasgasrider.org/forum/showthread.php?t=2162 |
Its actually the opposite Fred. The larger capacities pull more air across the face of the jets which draws more fuel for a given size. Thus, a smaller engine needs a larger jet to get the same amount of juice.
Loss of bottom end snap, and hard starting are indicators, but they generally occur over such a period of time that you never really realise. Best advice for it is to pull the cylinder at a set amount of hours. Take a comp reading and measure the ring gap. This will let you know where you're at and you can base your next rebuild off that prior knowledge. Also peeking through the exh port when the pipe is off can show signs of blowby on the piston skirt.