2003 Yamaha YZ 250 - Answered Questions & Fixed issues
Yamaha yz250 suspension settings
There is too much involved to include everything, but I can describe to you what everything does.
You have compression dampening which slows the rate at which the shock or forks can compress. Then you have rebound dampening which slows the rate at which the shock or forks can extend.
The compression adjuster on the rear shock is toward the top, sticking out sideways where the resivoir mounts to the side of the shock. The rebound adjuster can be seen below the swing arm on the side of the shock.
The compression adjusters on the front forks can be seen from the top. (its the one in the center, the other is an air bleed) The rebound adjuster is in the center of the lower fork leg, and can be seen from below the fork.
The settings are measured in the number of "clicks" from seated. More clicks from seated will be softer, and less clicks from seated will be stiffer. The best thing to do is to see where you are now and adjusting from there. I like to write them down as I go. Turn the adjuster clockwise untill it stops and take note of the number of clicks. DO NOT FORCE IT! You should also check your service manual and take note of the standard setting, and also take note of the maximum number of clicks you can go from seated. You dont want to screw the adjusters out farther than the max, shock damage can result.
You might try changing to the standard settings and try adjusting from there. If the bike doesnt ride at least moderately decent at the standard settings, your shock and/or forks may need a rebuild.
Generally speaking more compression dampening in the rear will result in less bottoming but a harsher ride. Less would result in the oppisite.
More rebound dampening in the rear will result in too slow of extension and packing up which will make the bike swap in the whoops, but it will not tend to buck you or throw you into a nose dive over a jump. Less would result in the oppisite.
In the front, more compression dampening will be about the same situation as described above with the shock.
More rebound dampening in the front forks can tend to take pressure off of the front wheel in corners causing washout, but too little can make the bike want to loop out over jumps.
Yz 250 yamaha
Check the reeds pull the carb and take the 4 bolts from the intake and look at the reed cage and make sure they are closed
1977 yz 250 isn't getting fire
Check the points for proper gap and clean. The old school bikes used more than just coil and plugs. Also, often overlooked, check the kill switch connection. Often this is the case on Yamahas.
Yamaha blaster runs but wont rev
ALWAYS have a fire extinguisher on hand when working on carburetors.
Remove the water trap bowl at the bottom of the petcock, (gas valve). Is there any water or trash in the bowl? Drain a cup of gas from the tank. Is there any water or trash in the cup? Dump it, clean it and re-mount it, ( not all bikes have a water trap bowl ).
Drain the carburetor. There should be a screw on the lower side of the carb float bowl. Remove the screw then replace it after the fuel drains. Turn the gas back on and wait a minute for the carb to fill with gas. Install a new stock NGK spark plug and try to start the engine. If the bike doesn't start and run properly then shut off the gas and remove the carburetor from the engine.
Remove the float bowl and clean the entire carb with a spray carb cleaner from the auto parts store. Wear protective goggles to avoid getting spray in your eyes. Spray into all the little airways and fittings in the carb. Before putting the slide back in the throat of the carb, move the clip on the jet needle one notch lower. Put the rest of the carb back together, clean the air filter and install the carb. Let the float bowl fill then start the engine. This process should get you back on the road.
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Why is my clutch slipping
Without knowing all the variables here. How old is the clutch that is in the bike now? It may just be worn out, and need new fiber plates and discs put in it. Are all of the clutch springs the correct ones, or if they are old, might be time to replace them. When its slipping, what kind of riding are you doing ? in mud, sand, or on hard ground ? What size engine and bike do you have ? Is your clutch cable and adjuster the stock and correct pieces for your bike ? or aftermarket ? Have you had the clutch apart recently, and do you know for sure that you put it back together correctly ? ( See Service Manual ). Lots of variables to consider... without knowing, you might consider these things I have mentioned. Thanks.. Hopefully these will get you going again.
Won't start
Oil rings are worn inside the motor.pretty much engine on it's way out.
Keeps poping out of drive
strip gear box and check all selector forks and cogs for wear etc ! check gear lever shaft etc ! P...
Poping out of drive
As in all gears? Or just 1 spcific gear range? Might need to pull the transmission apart and have the gears "backcut" or just replace them entirely...
Kick starter keeps binding up
do you mean it sticks down after kicking ? if so the return spring or cog on the kicker are damaged ! remove side cover and you can see the problem ! P...
Valve clearances
If its yz It is a 2 stroke and has on valves per say. It has a reed valve located between carb and head. Lots of times they need to be replaced or re-clearance (Make sure they are free of debri and flat on the housing.
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