2004 Yamaha YZ 250 F - Answered Questions & Fixed issues

If you mean the big nut under the clutch pressure plate???
Use an impact gun, air or electric.
The do sell a special tool to hold the clutch, but they are expensive.

Any Yamaha bike dealer or try ebay.
Keep it lubticated to avoid wear!
Hope this helps

Do you have a service manual of any kind? That, or taking the switch apart are the only ways to determine the colors, and why do you need to know them?

turn gas on under tank ,get new spark plug, gas mite be bad.

Sounds like the Floats in the Carburetor are stuck causing the Needle Valve to be stuck in the open position. (OR the floats have failed. Replace them.) This will happen if the bike has not been run in a while. The gas goes bad and gums up the Carb. The carb needs to be taken off & disassembled and cleaned with a suitable cleaner like B-12 from auto parts dealer. When gas goes bad, it has a distinct smell.

Sounds like you have a vacuum leak between the throttle body and injectors, or the carb and intake. Is there any vacuum assisted actuators on the engine? That might be a place to look, where something is actuated when you put it in gear.

Oil level to high is what I'd check first.Hope that helps, good luck.Les

take bottom screw out of sump (bottom of engine). simply let it drain

hi buddy if your on about the brake reservoir there totally different lubricants to refill the oil in the engine you need to unscrew the filler plug on the left side casing of the engine the blue plug on pic below and replace the oil with {silkolene pro 4 sx 15w-50} fill this up until it reaches 1/2-3/4 full on the oil sight glasslocated on the right casing also the brake reservoir is on the front brake lever pic below will show you unscrew the lid to refill with dot 4 brake fluid also the same with rear fill with dot 4 hope this helped buddy get back to me if any probz

could be. I had a 91 kx 250 that was acting crazy and it turned out to be the stator and cdi box. you can check the stator easly with a omes meter but the cdi box is nearly impossible to check. you pretty much have to buy a new one and try it. also check to see if your power valve is working.

contact Yamaha dealer parts department is the best bet

Sounds like the motor is seized.No oil is gonna fix that. Top end job may be in order

has it been sitting? if so its going to need a carb clean, its just starving for fuel, also you might want to throw a new plug in it #CR8E and one more thing and this is a very common mistake, make sure the air filter is installed and has filter oil on it, believe it or not that filter and the oil thats supposed to be on it play a major role in the runability of that bike.

Try cleaning the carb or air filter do you have a idel screw

This is a 2005 modelhttp://www.analogx.com/cgi-bin/cgivin.exe?Mode=Decode&VIN=jyacg21c75a008560&Submit=Decode

One, That thing should fire up in a second, if not, you got to get it so it will. Try not touching the gas, just pull on the choke, and give it a try. If that doesn't do it, try something else next time. I had a KLR 250, kick only, and that thing would start first kick every time, no matter what. I loved that little bike. Hope this helps.

Could be bad fuel, and/or faled plug.

Would almost certainly be blocked pilot jet and pilot circuit a classic symptom of this is running only with choke on
buy new pilot jet an compress air clean the hole the pilot jet screws into
regards Jamie

I doubt the repair shop has done anything wrong. Yes, it sounds like an air leak between the carb and the head. Try tightening the mounting screws and bolts. Also check the tightness of carb screws on the choke etc.. Now check tightness on the head bolts and other mounting hardware on the head. Be sure the throttle is operating properly and the cable is not kinked or pinched.