If u can tune a sled, the 250 tb is just a remake of an old snow engine.

 

Thats the problem, ive never worked on an old 340 or anything like that. I work on my 500 with ves so its alot different.

 

I just realized why your wheeler is so doggy on the bottom end. The white primary spring will only give you around 5900 max rpms and has a low engagement. The Aaen top end pipe should be turning at least around 6500. Call rick Ritter and get his Black dalton spring with orange markings. It will still have a medium engagement but turn the right rpms on top. There are also a couple of other options for springs as well. You can use the polaris brown or also the yellow. Depending on how the jug was ported will determine how much bottom end it has too. The 250's and 300's can drop a lot of bottom end quickly if ported incorrectly. Bubba

 

Ya the guy tht ported it did it too the max to where i wouldnt loose much bottom and still have good horses throughout the power band, because he knew how touchy the 250 engines can be. I suppose i will have to change springs then. Thanx.