Hello guys, running a CRF450 on meth and had a question. Is it ok to close the low side on the tilly carb when you start it on the grid, then turn it up once you get on the track. I have noticed with my built motor I get a lot of blow by if I let the engine idle much with the carb set to 2.5 out on the low. My thought was to turn it to 1.5 out when starting and idling. Any suggestions or input is appreciated. Thanks!