86 250r in coled weather

[alec3]

hey hey

so... i've got a 86 250r. Been riding if for close to two months now and cant get enough of it. im simply in love. but its now getting closer to winter and i would like to continue riding.

my question is what do i have to consider when riding a 2 stroke during the cooler months. some have told me just to allow the engine to warm up longer than normal (10 mintes). others have told me i have to re jet the engine to avoid blowing it up. some have said to use the jets already in the carb, other have said to increase the jet by two sizes.... whats the really answer??

If the answer is to increse jet sizes, where or how do i go about getting these jets

if its matter... i live northern muskoka, ontario. temps are anywhere from -10 to -30 with butt loads of snow

thanks a lot for the help

play safe

[Dirtcrasher]

If your dealing with that low of temperatures, you should just grab another carb and set it up for cold weather. Colder it is, you just have to richen up a bit. The pilot circuit and needle jet won't matter nearly as much as when your wide open on the ice or otherwise. Many people fatten up or richen the main jet and thats about it. That alone may save the motor, but cost you off the line as far as how well it idles and gets up to speed.

Every motor is different and what works for Tom down the road with his 250R may not work with yours. But again, you won't blow it up unless you run wide open with stock jetting in the freezing cold. There are a ton of disussions on jetting if you do a search with the toolbar above and many guys have more experience on 2 stroke jetting than me

Your local dealer or Sudco can sell you jets....

[250rAL]

For MY particular setup, I go up 2 sizes on the main and raise the needle 1 notch. I don't ride in anything below about 20 degrees F. though. You do want to allow a little more warmup time before getting on it hard. You can cold seize the motor if the piston heats up quickly in a cylinder that's still cold. I start moving almost imediately after starting but take it easy until I feel heat coming from the radiators.

[Yamada]

If your dealing with that low of temperatures, you should just grab another carb and set it up for cold weather. Colder it is, you just have to richen up a bit. The pilot circuit and needle jet won't matter nearly as much as when your wide open on the ice or otherwise. Many people fatten up or richen the main jet and thats about it. That alone may save the motor, but cost you off the line as far as how well it idles and gets up to speed.

Every motor is different and what works for Tom down the road with his 250R may not work with yours. But again, you won't blow it up unless you run wide open with stock jetting in the freezing cold. There are a ton of disussions on jetting if you do a search with the toolbar above and many guys have more experience on 2 stroke jetting than me

Your local dealer or Sudco can sell you jets....

Just to clarify . I think alec3 wanted to say in winter the temperature is between 14 and -22 degrees F, not -10 and -30 degrees F. Am I right alec3? Damn imperial system

[Dirtcrasher]

Just to clarify . I think alec3 wanted to say in winter the temperature is between 14 and -22 degrees F, not -10 and -30 degrees F. Am I right alec3? Damn imperial system

It's still a huge temp difference from 80 degrees and he'll need to richen that puppy up....

It's the lean main jet that leans out the piston and does the most ha.

Jetting stinks, but it has to be done. Even if it runs, and lean stuff runs FAST, you usually don't find out it's lean until it blows up.............

[tecat-z]

I'd go up 2 sizes on pilot if it's that cold. Even with a air screw adjustment, you will still have a hanging idle at those extremes with stock pilot. Needle, raise at least 2 clips. Main, go up til it breaks up at current temps. Then go up a few sizes from there. It's always better to be safe than sorry. I've siezed a engine when warm out, at part throttle cruise. It can happen any time you're on the edge. At any temp. But... the cold makes them WAY more intolerant. Especially, on a fresh motor. 4 strokes don't have the cold weather issues like the 2's. Unless you're running a new 450. They get lean fast ond just BOGGGGGGGGG.