Where is this place you live??? I ride my zilla in 90 degree heat and 45 degree rainy days without fouling plugs. Unless your changing elivations you shouldnt have to rejet for the weather unless your running very very very high level modifications.

 

These people with the 2 stroke-itis are killing me! They automatically think if it is a 2 stroke you rebuild it after every ride. I'm here to tell you that I turn way more wrenches on the inferior four stroke than I ever have to do on the 2 stroke. When I hear that stuff, I know the person saying it has either: 1. No mechanical experience and/or 2. No experience with a 2 stroke anyway.

BTW, mixing gas is friggin' fun to me.

 

If your bike is taking 45 degree changes in temperature then it does better than the 2 strokes I've owned. Its not unusual for Michigan's weather to change a great deal from day to day, not sure about connecticut because I've never lived there. The motto here is "If you dont like the weather, wait 5 mintues". Just because your bike runs in different temps doesnt mean its running right or at peak power. When temp changes that much it effects your a/f ratio and its more sensitive and important on a 2 stroke than most 4's. My buddy thinks like you, and never changes his jets for weather. He just had to have his shee rebuilt...

 

I thought Arkansas was the only one with screwed up weather?LOL!

 

686 on nos by 1-2 bikes come on now. 686 raptor will smoke you bad unless you have motor work as well

 

I have to agree with raptor6.That 686 raptor should have run off and left you.I raced some 686's at Little Sahara.They were not on the bottle.I could beat them,but they ran extremely well.They were alot faster than the piped raptor I use to have.They had done alot of work to them including the 686 kit.I was impressed.They would have spanked a stock DS.

 

I dunno Our weather changes by the season more then by the day but we get the whole gromet from 10 or 20 below on some winter days to 95 and humid in the summer. you get the lake effect weather changes up there from the great lakes thats why your weather changes so quickly I would think. Now I dont ride in the dead of winter on the 2 stroke but Ill ride late into the fall with a winter coat, gloves, and some thermal underwear. Ive been riding 2 stroke dirtbikes for years and never had top end problems. Im sure if you dynoed them there would be a peak power at a certain humidity and temp but I havent ever noticed enough of a change in peroformance to notice as an agressive trail rider. nothing like sputtering and fouling plugs. it probably would if I jetted it myself carbs are my demon. I have all my carbs jetted by my engine builder. call me a weakling for it but its worth the 50 bucks for him to do it instead of burning up a lot more money rebuilding from a lean mix

 

We ride year round, and ice race on the coldest, darkest days of winter in early January through the end of February not including practice through December. Sure once you rejet for 10 degrees you dont need to mess around with it when it goes to 20 or 0, but when it hits 45 and you're set for 10 it needs to be tweaked. When the 250R used to be in service jetting was important and changes were noticeable and when you are racing it matters. If you are a rec rider and you jet way fat you can go through the winter without a big problem, but there will be consequences. Too fat and she smokes and blubbers, too lean and she warms up fast. Not too bad for a 3 lap practice and sometimes you can get by on a 5 lap heat, but when you run 10 lap features it can be an issue. I even overheated the raptor once from being too lean one day. The guys in Wisconsin and Minnesota that are running winter endurance races really need to have their bike running in tip top so it makes it to the end of the race.

During the summer it can jump from 65 to 85 or higher a day or two later. If you're going to be riding all day or drag racing you want the jetting to be awfully close.

Can you get by without constant rejetting, sure. Will performance and/or longevity suffer, probably. Its always been worth my time to make sure my jetting is on, just my opinion and experience.

 

I guess Ive never noticed much of a power difference at all and Ill have to say that I disagree with longevity. I have yet to need a top end on any bike ive owned

 

Maddog56 is right about how weather changes can affect a quads performance.A few years ago,I went with some of my friends to an atv park.My friend and I had piped banshees.They were really evenly matched in performance.One weekend we were racing,I could beat him by about a bike length.We went a few months later to the same park.He could beat me by about a bike length then.We had not changed anything on the bikes,just the weather was different.Just riding my bike,I couldn't tell a difference.Our jetting wasn't identical.One day mine run better,and on other days his was faster.That way we both got a chance at winning.