colder weather?

[250exkid]

im in wisconsin, i have hot summers and cooold winters, now should i rejet my stock 250ex or is it fine when its stock???

Be fine, but for top performance their should be a jet size change every 20 degrees change in temp.

[Honda#4]

It will be on the rich side, but like slow said for top performance you should jet it. It's not that hard if you have basic mechanic skills.

[250exkid]

ok ill try to get some money to buy the dyno jet kit befor summer, or do you truly need to cause all im gonna do is putt aaround a bit cause i got a snowmobile anywase:confused:

I never changed jets. I went from summer to winter on the same jets 2 years ago and the plug reading was still perfect and that was with no muffler too. I was running a 165 main.

[rooster300ex]

My quad runs better when its sucking cold air. Colder air makes more power though. Here in oklahoma people look forward to alil cold weather. Not as cold as the northern states though.

[Honda#4]

Rooster300ex is right about the cold weather thing. When I ride my bike I notice a increase in power in the cold weather too, except for one thing it's cold outside.

Colder the air the more air your sucking.

My pocket bike if i drive it in 80 degree weather and then let it sit till night when it is say 50 degrees their was a huge power differance.

[250exkid]

oh i no the colder the faster/power its the same for my snowmobile i like to run that in -5 degree weather i go way faster and yea i noticee on my atv it has itts gains but what im getting at is it truly a must or no?

Originally posted by 250exkid
oh i no the colder the faster/power its the same for my snowmobile i like to run that in -5 degree weather i go way faster and yea i noticee on my atv it has itts gains but what im getting at is it truly a must or no?

It a no

[Toadz400]

No need buying a jet kit, just go to a dealership and buy the jets that you need. You'll end up saving a lot of money.

You should rejet if you plan on riding during the winter as it will start a lot easier and perform a lot better along with being better for your engine.

The reason why vehicles run better in colder weather and why you need to rejet is because the air is denser when it becomes cold, meaning it contains more oxygen. Your pulling in the same amount o fuel because your jets haven't changed but there is more oxygen in your mix causing a lean condition. More oxygen = more power as long as you are jetted correctly.

Rule #1: Don't listen to a thing slow says.

[250exkid]

alright. now on jets, are dyno jets the same as jets from my honda dealer? (proud owner of a quade from Robs performance in johnsons creek.)

[Toadz400]

Originally posted by 250exkid
alright. now on jets, are dyno jets the same as jets from my honda dealer? (proud owner of a quade from Robs performance in johnsons creek.)

No they are not. Dyno Jet has their own sizing. Check out what the pilot jet and main jet size is in your carb and I should be able to tell you what to order from your dealer.

[250exkid]

alrighty just give me a few days

Originally posted by Toadz400


Rule #1: Don't listen to a thing slow says.

I didn't give no false info:rolleyes: . If you look at what i typed its all fact.

[250exkid]

guys dont get into a fight

[Toadz400]

Originally posted by slow
I didn't give no false info:rolleyes: . If you look at what i typed its all fact.

That first sentence made no sense, at all. And nothing you typed is fact.

[jeremy_283]

Originally posted by Honda#4
It will be on the rich side, but like slow said for top performance you should jet it. It's not that hard if you have basic mechanic skills. i THOUGHT IT WOULD be leaner since colder air is more dense?

[Toadz400]

Originally posted by extremejrowe
i THOUGHT IT WOULD be leaner since colder air is more dense?

It will be leaner, he either has it backwards or it was a typo.

[Honda#4]

I had it backwards, sorry about that. I forgot to think for abit about it. My bad.