i have a honda 300EX and i put the White bros E-series silencer on it. now my quad runs hotter, and les/pops when i decelerate. it seems to idle just fine tho. i was told that i need to make it richer by increasing the main. i'm not sure what the main is, or how to increase it. they said that i have a 122 main now, and i need it to be about a 127. what does this mean?

 

it means that you will make the main jet component in the carb bigger. which lets more fuel in at 3/4 and above throttle. richening the mixture strength the make a good burn with the new addition of the extra flow.