2010 TC 250 versus 2009 TXC

This sounds like it can be true....Do you think a person could just swap out the flywheel between the 2 bikes and get a quicker revving TXC?

Here are the ratios from my 08 TXC250. TE, SMR , TXC all the same in my manual.

Maybe someone with a 010 manual can show their ratios here.

1st - 2.0
2nd - 1.611
3rd - 1.333
4th - 1.086
5th - 0.920
6th - 0.814

There is another thread on here with gear ratios. You also need to tell us what your primary gear ratio is, crank to clutch?

The primary drive ratio doesn't matter too much as it can be managed with final gearing. The more critical issue is the tranny ratios. Based on the published Husky figures for 2010, the TE/TXC tranny ratios appear to have widened out a bit(~7-8% overall according to my calcs) from 09 & earlier. It's roughly equivalent to having a 13-50 sprocket combo for the first few gears and a 14-50 combo for 6th, on the 04-09 year bikes.

If my guess is correct, using final gearing that makes the bike rev about 7000RPM in 6th at 50mph( 2010 TE/TXC) should give a decent low 1st gear for real tight stuff.

Agreed, but if the primary gear ratio is higher. Then first gear would also be higher.

You can offset the primary ratio with the final drive ratio to give the same top speed. But the gaps between each gear will be effected...

I hope that makes sense. Do the calculations on paper is best.