I have had a 137 main jet in for a while. I have rode in 60 maybe 65degree weather. It ran perfect. But this weekend were goin on a trip and it is supposed to get up to 80 degrees. Do i absolutely need to change jet? or shoudl i be good?

 

if you have a 137 in that .. with the mods you have.. expect your quad to blow up soon...

 

I'd agree if it was a mikuni jet, but since he's got a dynojet kit listed in his mods i'm assuming he's got a 137 dynojet installed in it (I sure hope so for his sake)

For a change of only 20 degrees I don't see a need to change your jetting if it's already set good, but how recently have you done a plug chop to see how close your jetting is to optimum? If you're already borderline rich then that 20 degree change could be just enough to push it over the top, but if your jetting is spot on, or just a tad on the lean side you should be fine. I usually rejet twice a year, once going into winter, then again going back into the warmer weather.