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Starting the yz250f
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Posted by: SqrlNuts---------------------
This is my first bike. I am having a hell of a time starting this thing. Sometimes she will fire up on the 1st or 2nd kick. Other times I'll sit there and give up. This happens even after I've been riding for a while, sometimes she will go other times I give up and bump start. I don't have this much trouble firing up my buddies 426. Any advice?
Posted by: SCHLAVA---------------------
Yeah, If the bike is brand new then it will get better as the engine breaks in and it will take a while. check out www.yamaha-motor.com. They have doug dubach on there showing how to start the bike and it works to a tee.
Posted by: Danman---------------------
Are you doing the starting drill? Also, how about using the hot start button? Other than the that it might be a jetting ussue. Also how old is it and are you vavles adjusted correctly. Its this something that just started or has it always do it?
Posted by: jeffg---------------------
I don't have a 4 stroke Yamaha , but would like to. My friend just got a 2001 WR250F, after having owned 2 wr400F's. Really nice! My point is that when I was at his place checking out the bike I asked if I could try to start it. During the course of the next few minutes I attempted to start it 4 times; meaning that I kicked it over 4 times. Each yime I cycled the kickstarter through until it reached the compression stroke, moved the piston past that point using the decompression lever, moved the kickstarter back to the top of its stroke ....and kicked! It started 3 out of the 4 times! The first time I tried I probably didn't kick it through fast enough. Each subsequent time it started first kick! As a complete novice to this bike (and 4 strokes), I found it no more difficult to start than any other bike I've ever tried to start (riding since 1971).
Posted by: yota---------------------
Set the idle high, higher than you think sounds right and leave it there. Get the fuel screw on the bottom of the carb set right, you have to play with it. When you get it where you have quick, clean response when snapping the throttle (in gear, not in neutral), set it a quarter turn richer. Adjust the screw on the right side of the carb under the black plastic cover till you get the best throttle response. This screw adjusts when the accelerator pump squirt starts. If the accelerator pump is squirting for more than about one third of a second, then do the BK mod or install the P38. Read the entire section on carb tuning in the back of the manual. Keep your hand off the throttle when doing warm starts. Use the hot start. When you kick, kick fast in more of a back motion than a down motion. I had similar frustrations but my bike now starts one or two kicks every time, hot or cold. If you stall or drop the bike, hold the comp release in and give it 4 or 5 kicks then try the normal drill.
Posted by: stormer94---------------------
Pay attention to how you turned it off or killed it. As a rule, if I stall it, I grab the hot start. If I just plain shut it off, I try and kick it first with no additional carb input and it's usually a first kick scenario.
The warmer it gets outside (got the bike when it was 45 degrees, now it's 95 degrees), the less I have to use the cold start, even if it's been sitting a while.
Don't give up, it's worth the effort. :D
Posted by: stormer94---------------------
I was also going to mention, if you find yourself kicking for like a half hour, just give up and replace the plug... it's almost always that. Anymore, if I kick it more than 20 times and it's a no go, I replace the plug and BINGO, problem solved.
Posted by: dmp437---------------------
Hopefully you're riding by now (original post June 20), but if it's a new bike, change the plug if it's the original. Something about the cylinder is fogged with a light oil for the trip over, and the plug usually fouls really easy. Set the idle to 2000 RPM's. When cold starting (using the choke), get the choke off ASAP, usually within 10 seconds. The bike starts MUCH easier after there's about 150 miles on it, but will never start as well as a 426. Speed of the kick is vital on the 250F; the faster the better. You can cheat and pick up a BBR billet kick starter which is shorter than the stock lever, but it will set you back $150 or so. At least you got yours to start, I was three days getting mine to start after I got it home. Let us know how it goes.
Posted by: curvecrazy---------------------
I have had excellent luck starting mine by first holding in the decompression lever when it is dead cold before even trying to start it and kick it over moderate speed stroke about 5 or 7 times. That seems to prepare the cylinder for starting and prime the engine I suppose. Then set engine up at top of compression stroke and use the decompression lever to get it prepared for the kickover. Kickover speed is critical. Kick it as fast as you can. Make sure your hand is not on the throttle when attempting to start it. I usually have no problems using this technique. More often than not it will start hot as well without the hotstart button as long as you keep your hand off the throttle. If all else fails, the hotstart button gets it going when hot.
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