I have a 99 cr 250 that boggs in 1 and 2 gear and i dont know why

DO NOT USE the over flow hole. Those thing are useless. I know I put 650ml in Tyler's 125, so I'm very confident in the amount that goes into the 250 is 650 ml as per manual.

Usually, it seems that changing the front sprocket is more cost effective and easier to do. The front sprockets are about $10-$20 and rears are normally around $40-$50. Usually 1T gearing changes made to the front sprocket are the equivilant of a 3T-4T gearing change to the rear. I personally would go up on the front instead of down on the rear. Right now your gear ratio is 3.846 (meaning every 3.846 rotations of the front sprocket, the rear sprocket makes 1 rotation) If you go down 2T in the rear (13/48) your gear ratio would be 3.692 giving you a little less torque and a little more top end. If you go Up 1T in the front (14/50) your gear ratio would be 3.571. This would be about the equivilant of a 46.5T rear sprocket. (If they made it) The nice thing about doing the front sprocket first is the cost. If you decide it's too much difference and you want something in between, you can put the stock 13 back on and then change the rear (and you would only be out the $$ for the front sprocket) If you start with the rear and decide it's not enough then you change the front you're out the $$ for the rear.

hi buddy simply take the wheels off and the caps remove the dust seal with a screw driver and the circlip which will onl;y be on 1 side and pop out with a long screw driver and hammer and hit it hard if it dont move after a couple off hits heat the hub or the outside of it and the bang it out then to reinstall the new ones just put the bearings in place get some stud bar with washers and 2 nuts slide this through the bearings and bush in the midle through the hub and turn the nuts th will pull them in or take it too a garqage and do it which is an easier option any more info buddy get back to me

Sounds like a bad or misadjusted clutch.

TURN THE IDLE ADJUSTING SCREW ON THE CARB.

hey, ,my name is ray, i have multiple things that it could be....... first off, it could be that your spark plug is fouled. and if that is not it then youmight clean the jets in the carborator. if that still does not do the trick, then you will have to check the ignition coil wires and there should be **** connectors that go from the ignition coil to the CDI Box. and if you don't know what the ignition coil is, follow your spark plug cable from your spark plug all the way to the end and it will be there....... and if that still won't do it, then you have to check all of the points in your bike....... if you need more help or don't understand something, then please let me know..
Ray

I had the same problem, and i was that the shaft that the kick start was attached to had sezied on to the idler gear in side the engine. all i did was drain the oil, remove the cover and replace the shaft and idler gear.

I have an 06 cr 250. I used to mix my fuel at 32:1 and it ran fine for a year or so as of late it's been fouling plugs every single ride. I've ridden 2-strokes all my life and know how to ride the powerband but lately its been spitting oil out of every seam in the exhaust. It used to maybe have a couple drops after a ride out the end of the pipe but now its leaking from the connection from the case, the pipe to muffler connection and a lot out the back of the muffler. i switched to 40:1 about a month ago and that's what is happening, i couldnt imagine what it'd be like if i left it at 32:1. I took the carb out and looked at my jet sizes, they are both a size smaller than stock. Any help? Also, the bike is so tempermental that I have to have all my gear on when i start the bike because I cant take my hand off the throttle for even a second or else the bike will foul the plug and die literally within 2 seconds. I know they arent meant to idle but its kinda extreme. my friend has a 2005 cr 250 and mixes 32:1 has no problem, can start his bike on the stand and walk away from it for 5 mins and put his gear on.it'd idle for at least 10 min before it'd die, but he'll kick it and it'd start right back up. I've heard running bean oil would help, but I've also heard it has a tendancy to seize up the rings? any truth in that? ,I would try more gas in your mixture, before you start changing everything. Its all in the way your ride, some people can do 32:1, some 40:1(me), some 50:1. ,,,