Very nearly perfect 2011 XC 300!

[Jakobi]

Originally Posted by widebear

To reiterate. I's easy to get hung up on numbers Like Glen pointed out, a ten point change in main jet is not alot. In fact it only equates to only one tenth on a mm per second unit of measurement, example 170 to 172 should read 1.70 mm , 1.72 mm ect. The most profound effect the sizing will have is at a duty cycle of 100% aka w.o.t. basicly nil at part throttle. I know this to be true because as a resulting mistake because of my poor vision without glasses. I accidently put a 115 main, thinking it said 175 in my buddys 300. He rode all day and only on the road section at the end of the ride did it become apparent the something was wrong. Dont be afraid of tuning a carb its just like pleasing the woman in our lives, the principles are the same they just all respond jusy a little differently!

Well said and well said by everyone. They are the answers I was looking for