Good day. what is right oil for my yz 250f cause i have used fully syntheric oil but got a problem my motor stuck the kick starter cant move down. would highly appreciate your advice thanx

SOURCE: my yz 250f fells like it has to much compression

check the clutch adjustment also the clutch could be binding or just stuck

SOURCE: how much oil for 2003 yz 250f fork seals

3 Pints is average but you can adjust it to your riding style and weight. Stock oil height is around 130mm from top but you could set it around the 110 to 100 range for increased bottoming if you do a lot of big jumps ect.. 5w oil is the usual weight but fork oil goes up to 20w.
-John

SOURCE: YZ 125 kick starter doesn't spring back

Spring is busted. If you aren't comfortable with piles of extraneous parts floating around, take it to the shop.

SOURCE: My 05 yz 250f clutch wont engage..

is this while its runnig or not, sometimes the cluctch wont engage while the bike is not runnig, but will engage when running. its common. if not they may just be stuck. did you drain the oil and have the plates exsposed to elements while the engine was out of the frame. open the clutch plate cover, check that they look fine. other than that if the clutch is hydrolic check for air in the system. and also the fluid level. good look.

SOURCE: 2005 Yamaha YZ 250f. suggestions on type of motor oil.

What did Yamaha tell you? I think 10 is too light. Call your Yamaha shop for the proper recommendation.