My yz 250 is running to rich how do i adjust it

SOURCE: yz 250 1992 wont kick start

check your compression I had a 94 yz that done that when i checked the compression it was really low so I put new rings on the piston and that's all it took to bring her back to life

SOURCE: CONVERT A YZ 250 INTO A WR 250

The YZ is a dirt bike as is. The WR is a street bike and has more accessories on it.

• Remove the body parts you do not want to get broken. Turn signals, tail light, speedometer, tachometer and mirrors are the main things. Fenders and headlight are possibilities also but the fenders tend to keep mud off the the engine and your body while the headlight allows you to ride at night.
• Change to a larger rear sprocket. Two or three teeth will make a difference. This will make the bike to " quicker " off the line and out of turns and provide more torque than stock. Top end is a bit slower but with all the twists and turns you seldom get to top speed anyway.
• Get a heavier flywheel. Yamaha has one but the cost is about $105.00. An aftermarket flywheel may be an option that would cost less.

SOURCE: 2003 YZ 250 Oil Change

Use 10w40 in the gearbox. Get the oil from your Yamaha dealer along with any filter your bike may need. Some bikes use an oil change as the "filter". To drain oil, get the engine warmed up and turn it off. Put a pan under the gearbox and remove the oil drain plug. Replace the oil plug when the flow becomes a slow drip. Change oil in late spring, the middle of summer and in early fall. Remember to lube the chain and adjust it when needed. Lubricate the cables with liquid graphite. Lastly, install a stock spark plug. Now go for a ride.

Please rate this solution as a "FixYa" if I have answered your questions. Thanks!

SOURCE: yamaha runing rich

http://www.motorcyclecruiser.com/tech/find_carburetion_problems/index.html
Take a look at this web site. Follow their instructions and I'm sure you will be able to fix the problem.

SOURCE: 1992 yz 250 won't start

A couple of things.1.Check the fuel oil mixture is correct.It seems rich.2.Check that the carby is not running to rich.With new reed valves etc.it may need to be set back to the original manu. specs.With older parts it may have been retuned to make it run with the old parts.(carby jetting etc.)3 make sure the fuel oil mix is using a good quality oil.It does make a world of difference.I hope this is a start to get you going.