250ex- need some answers from the pro's
 

1. What size and brand jet does it come with?? Is the dyno jet kit the best?? Or just increase the stock jet a size or 2

2. Air box lid on or off?? What air filter?? Foam or K @N??

3. anybody running 20's on the back??

4. Is there a oil filter?? How much oil does it hold?? What brand and size do you use?? 20w-40, 20w-50 etc.

Any tips on making it better?? How much are graydon nerfs?? Thanks i did not get a manual with it.

250ex- need some answers from the pro's
 

I'd go with a k&n with outerwear and the lid off. As for tires 18" would be good, that bike doesnt have a whole lot of horsepower so the smaller the tire you get the better.

250ex- need some answers from the pro's
 

It depends where u live if it is a very dusty area keep on the air box but if i do keep it clean i recamend a K@N air fileter and Pre filter

250ex- need some answers from the pro's
 

What carb is on the quad?? Anybody know the stock jet size??

250ex- need some answers from the pro's
 

14MINS-if you really want to make the 250ex perform ,well that is perform as well as a 250 ex can then i would suggest going with the powroll big bore kit and pipe and header they make for it .if you look on the powroll website you will see a 250 ex and that was my wifes quad that they did a R&D project on. that thing really hauled for a mild mannered 250 and it felt like it had a 30 to 40 percent gain in overall power and performance when they were done with it.call powroll and ask to talk to (TOM WALTON)he is the general manager and ask him about the 250 .the guys in the shop at powroll were impressed with the gains they got out of such a small motor and they had a blast riding that quad.while you are talking to tom ask him about the 770 kit for the raptor and how it performs i think you will find that these guys are about as good at building four stroke motors as any one and the knowledge they have is incredible.it sounds like if you are willing to spend the money on all the parts needed to make the 770 work reliably you would have a raptor that if geared correctly would be hard to beat.when i say all the parts for the 770 i mean valves and springs /carbs /rods/cam and all the other parts that will be stressed with the extra horsepower.

250ex- need some answers from the pro's
 

I think stock jet size is 95 and it's a Keihin carburator. I went to a 110 on our 250EX & Recon after a few mods. Forget the kit, they're a waste of $$$.

We run a Uni filter with the lid on. K&N was too expensive.

Yes, we have stock 20' 400EX rear tires on ours. They greatly improved acceleration and handling.

There is no 'oil filter' but there is an internal screen. You have to take tho motor apart to get to it. I did that to our TRX90 and there wasn't anything in it. Haven't checked our 250EX or Recon yet though.

One mod is to cut the end off the air intake tube. This will greatly increase air flow and lean it out BIG TIME. You will need to re-jet after this mod.

Hope this helps,

250ex- need some answers from the pro's
 

I'd just upsize the main jet.... trim both ends of the snorkel... and remove the quiet core and spark arrestor...

and oh-yeah.... put 400EX rear tires on it, and reverse the front rims for better handling!


that's what I've done to my wife's 250EX

250ex- need some answers from the pro's
 

moto & dsapp- Thanks for all the helpful info

250ex- need some answers from the pro's
 

I got my wife one of the first 250ex's and have been thru alot with it.
1. Put razors on the front and rear, kept the stock size in the front and put 20x11x9 on the rear. I would not go any smaller on the
rear seeing as it hits the rev limiter really quick now
2. I put a White Brothers E-series exhaust on it.
3. K&N air filter and prefilter.
4. Wasted 50 bucks on the jetkit seeing as when it first came out the needle was way too short and always fed too much fuel. I think
that they finally figured out what they did and are replacing the needles with the correct ones now. But I kept the OE needle in it.
5. We do a lot of riding around mud and water so I left the lid on and put 6 UNI filters in the lid.
She wanted some bark busters, nerf bars, bumpers and slid plates so Santa got those for her in 2001.
At the time the only nerfs that you could get was from DG, not too impressed with them but she likes them .
My biggest concern was for the differential, if it gets hit hard and gets a hole in it then lets just say she won't be a happy camper, so the skid plates are highly recomended.

Now I want to put the bigger piston in it for her, just so she has a little more power, she likes it the way it is but hey we all want more.

As for how much oil it holds, on a drain it will take about 1.7 qts. Now on the back of the engine right infront of the swing arm there is a plug that you can take out and drain the oil, its a lot easier to jack up the front end and pull this plug when you have a full skid plate.

Anything else let me know got the factory repair manual with ours too. Already sent some atv members carb pics and other info that they needed.

250ex- need some answers from the pro's
 

Used on my 1999 Recon:

I learned this right here on the forums. I know for almost 2 years I was dumping the oil from the plug under the motor. What I usually do is take the bolt out after a ride and let it sit all night to drain out.
What happens after most of the oil is out is the drip flows to the side and then down on to the skid plate.
Mine looked like a mess under there but it always had fresh oil in it.

I would use the back bolt and jack the front end up for less mess.

The oil was the ChetRacer blend. 10w40 + synthetic. All most 400 hours still looks like new inside.