Question about 2003 Yamaha YZ 250 F

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I have a 07 yamaha yzf 450. never had a problem starting till today. there is a ton of compression built up or something, and i cant kick it

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Remove the spark and turn it over it is probably flooded. let it set without the plug in it after doinng this for a little while then reinstall and try again

Posted on Jun 27, 2009

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1 Answer

No compression, decompression jammed


Valves could be sticking closed or open causing (good or bad compression) that or de-com-lever if faulty somehow.. And you need to do a compression test

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Nuetral light wont come on , wont start


Hi, Mlboasko for this scenario you will need your service/owners manual if you can't find the first and best tool you ever bought for your Yamaha, despair not, for a mere $0 you can download another one. For more information about your issue and valuable "FREE" downloads that you will need please click on the links below. Good luck and have a nice day.
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1 Answer

How d yu start a yamaha yzf 450 an hw do you use the pressure release


push the kick start through until you get to a hard spot(TDC) then hold the decompresser and kick it just a little more to get it past top dead centre. release the lever
then one good kick, do not touch the throttle, even hold the bar not the grip so your not tempted to give it a squirt.


If it also has the hot start lever, or button this is for when the bike is quite hot and it leans out the mixture for starting, activate the lever and start the bike, then release the lever. This also helps if youve had a little lie down and the bike is flooded

what also helps starting is
new spark plug
clean air filter
new oil
check valve clearances
a small squirt of upper cylnder lube in the tank

Apr 01, 2011 | 2005 Yamaha WR 450 F

1 Answer

Yzf 450 (i think) need to know what year model it is, chassis number JYACJ01C2YA002207


JYA -Built in Japan by Yamaha.
CJ01C - Single cylinder rear wheel drive Moto-x model YZF
2 - Security digit - valid
Y - Year model 2000
A - Manufacturing plant - Determined by Manufacturer
002207 - Bike number 2207 to roll off the line

Sep 11, 2010 | Yamaha YZ 450 F Motorcycles

1 Answer

How to start a yamaha wr250 with manual decompression


kick it over till you feel the compression. Pull d comp lever and kick it maybee a quarter or eighth kick. just enough to get past top dead center on compression stroke. Then kick like you going to start it.

Feb 06, 2010 | 2003 Yamaha WR 250 F

1 Answer

Will o4 yzf 450 muffler fit my 07 yzf 450


Exhaust : 0.20-0.25mm (0.0079-0.0098")
Inlet : 0.10-0.15mm (0.0039-0.0059")

Jun 01, 2009 | 2004 Yamaha YZ 450 F

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