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How can I rejet the Jetmoto 250 sport carb with the new jets from John at Raceway atv??

 

Remove the carb float bowl, and remove the jet from the needle valve, I think that is the correct name, and screw the new one in. The other is outside and behind the carb bowl. Again not sure if it is the correct name, but I think it is the mixture screw. I read here on another thread to set it at 1 7/8 ths turns out.

That is what I did to my son's and it runs MUCH better, and we needed no choke to start it up today. Very easy to do, takes more time to unbolt the carb than to change the parts out.

 

Ok.. I just had to do this to my JM 250... Very easy to do... First off, it's best to remove the rear plastic/battery from atv and air filter. .. It just makes things much easier..

2) Shut fuel valve off..
3) Drain the float bowl. The screw at very bottom of carb bowl facing out the same side as the idle screw(right side when sitting on atv). Open it up, and you should see fuel coming out the drain hose thats attached to bottom of carb.
4) Once the fuel is drained.. A) remove the choke cable.. This is done by removing the cable from the bracket, and pushing up on the choke lever.. Then slide the cable out of the slot in the lever.. Be careful, because the lever is plastic, and can break. B) Remove fuel line.. Don't waste time messing with the hose clamp.. Just pull the hose off. c) Remove the carb from the atv.. 2 bolts
5) Take carb to work bench, and flip upside down. And remove the bottom bowl cover. I think it's 3 phillips head screws.. Once open you can see the float( try not to touch it, or bump it) And you will see 2 jets... One long skinny one, which is easy to unscrew and replace. And you will see another jet beside it, but sitting up much higher. This is the short jet, and it screws into a long tube that goes down into the carb(needle valve) You need to put a wrench on the tube(needle valve).. I forget what size wrench will fit, but it's a really small one... Hold the wrench in place, and use a screw driver to break loose, and unscrew the short jet.. Then replace it with the new one...
6) Put everything back together... And fire it up [img]i/expressions/face-icon-small-smile.gif[/img] No need to mess with the mixture screw... You will see it sticking out the bottom of the carb, and it's position is marked with paint..

This is how I did my jets, and the atv runs great... I hope that helps ya out...

 

Is there any modification required to install the 2" 4-110 wheel spacers from Jetmoto?

Are the outsides of the front and rear tires squared? IE, should I only do spacers on the front, or rear?

What is the K&N Air Filter Part number for this? Is it just a piece of foam (Unifilter?)

-JNY

 

Great step by step instructions TriplxX07! The only thing I did differently was to open up the fuel screw to 1 7/8 turns. Stock was 1.5.

 

Is the timing adjustable? Has anyone played with an aftermarket ignition system yet?

Also, How much 12v do you guys think the magneto can put out? (is that what it's called? the thing like an alternator)

I'm thinking about taking the headlights, brakelights, etc off and installing an set of custom LED headlights, brakelights, and some LED strips on the quad.

Thanks!
-JNY

 

An easier question:

Are the shocks adjustable? My 300lbs behind is going to really load this puppy down I think. I would like to be sure that a hole or bump won't bottom the shocks out.

If they aren't adjustable, I can probably find some the right size with a higher rate to hold me up better, but the oil in the front would need to be changed to conpensate with enough dampening, and maybe the nitrogen would need to be charged to a higher PSI. I really wish there was more technical information available in one place.

-JNY

 

Just so you know, LED lights take WAY less power to run. You can put alot of led lights on a quad and it wont come close to hurting the stator.

 

I'm pretty big into electronics. It's just that I'm planning to put a *lot* of LEDS on. haha

Here is a noob question for you. It's probably covered in the book, but with normal riding, how often should I change the oil? Normal as in trails with a little light climbing and such. Not extreme riding, racing, or anything like that.

-JNY