At what altitude to rejet?

[Thess87]

I have a couple tw200’s and l live in Kansas so not high elevation. My first year taking bikes out west. Where we hunt the highest they will probably be driven is around 9000’. Should I rejet them for that altitude?

 

[EasilyExcited]

They will run super rich. Definitely rejet to 6 or 7k anyways

 

[BBob]

I've run mine stock jetting up to about 8500-9000'.

 

[JR Greenhorn]

As a street-legal bike with a carburetor, your factory jetting is almost certainly too lean already, meaning you'll probably be fine at higher altitudes. Conversely, you could likely achieve smoother and cooler running around home by rejetting there. I've gone through exactly that with my carbureted street bike. It ran great on the passes in CO, but would build heat in traffic around home. Shimming the needles and rejetting helped.

The TW200 has a pretty strong following, so I'd dig up what the experts on the TW forum or ADVrider say works.

 

[Alarka]

I used to jet my old ATV’s to 3500’ and that would keep me from redoing the jetting up to a mile or so of elevation above that IDK maybe a dial-a-jet setup