Im looking to buy a new carb for my trailblazer 250. Im looking at those two carbs. With only a 30 dollar difference between the two i would think the better buy would be the 38mm. Which one is the better buy?

 

if you had a more radically modded cylinder i would say the 38, but with what you have i think the 35 would be a better choice, imo.
this is assuming that the mods are all listed on your machine

 

Don't get the 38TMX!! Its way too senitive for the 250. It had one on mine for a while
but now I have a 35PWK. I like it a lot better.

 

Do not go with the 38mm tmx carb, it is way to big and hard to tune. The best carb would be a pwk. 35mm pwk is perfect. If you really want to wake the quad up then get it ported. You will feel alot more with a port job then with a carb change. The port job wont cost much more either.