Question about 2004 Yamaha YZ 125

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Does th reed valves cause the bike not too turn on

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If you mean not to start they could. a reed valve is simply a one way valve that captures the air fuel mixture in a two stroke motor forcing to go into the combustion chamber rather than back out the carb

Posted on Oct 02, 2009

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Small pinholes in the reed valves

Yes mate... It is hard to say without seeing the reed valve but I guaranty a dodgy reed valve will make running and tuning the bike a nightmare. Your reeds need to seal perfectly and open and close about 2-3 times a second so if any cracks, holes or damage to them then they will never seal correctly which will allow blow back through the carbi and incorrect air and fuel mix to be sucked into the motor. best solution buy a V force reed kit it replaces the entire cage and reeds just bolts in (4 bolts) I sell them for about $160 delivered, or if your know what you are doing then you can just replace the reed petals with new... About $60

Feb 21, 2012 | 2004 Yamaha YZ 125

1 Answer

I recently rebuilt my 2002 YZ250 and lost my reeds. I purchased new boyesen rad valves. The bike runs great for about 10 minutes and then it dies, but it starts immediately back up. Does anyone know what...

Chances are that some trash has gotten into the float bowl and is intermittently plugging up the main jet. When the bike dies the suction on the jet dies, the trash is no longer blocking the jet and the bike starts right up.

Apr 14, 2011 | 2003 Yamaha YZ 250

2 Answers

Hello, I recently purchased a 1973 Suzuki TS 185. The bike turns over and starts right up very easily. When the bike idles I can rev it and it seems to work very well in first and second gear. However,...

Check for air leaks. You probably need new crank seals and a new intake manifold. Check your reed valves if you have them and do not hold the throttle wide open if it is bogging you will score the cylinder by running it lean.

Oct 06, 2010 | Suzuki TS 185 Motorcycles

1 Answer

The kick start on my blaster used to work now it just goes to the ground and you can use your hand to do it. are the idler gears bad or is the compression bad? and can a reed valve cause this

If you can turn your engine over by hand easily by pushing down the kick lever, and your not Arnold Schwarzenegger, You have a compression problem. Do a compression check. If your bike has under 100 PSI you need to disassemble the top end , bore or hone the cylinder (depending on condition) and install a new piston, rings, and gaskets. This should fix low compression. If the lever is going down but the motor is not turning over then you need to remove the side cover and check for broken kick gears. Reed valves have nothing to do with this problem.

Jul 21, 2010 | 2002 Yamaha TT-R 250

1 Answer

Bike backfires

Sounds like sand in the reed valve block.
Take the carb off & carefully remove the reed block ensuring no more sand goes into the crankcase. Clean & replace


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Aug 14, 2009 | 2001 kawasaki KMX 125

1 Answer

92 yz 250 hard to start and woulnt full accelarate

i may be wrong but it sounds like your bike has either,a dirty air filter(this would explain the bogging out in the midrange) or a bit of crud in the carb,check the tank filter(the one that is incorporated in the fuel tap),then get the carb off and give all the jets a good clean out,it only takes a small amount of dirt in the fuel system or carb to seriously affect performance,while you have the carb off,take off the inlet manifold that holds the carb,remove the reed valve block and check the condition of the reeds(if you can see daylight through the valve seat)ie between the reed valve and the base block,the reeds may need replacing,this may also explain your hard starting,as the reeds need to fully close against the block to get the right amount of air/fuel through to the crankcase,.these bikes generally go like a rocket so it will only be something minor which is stopping you enjoying it to its fullest..hope this helps

Jul 23, 2009 | 2003 Yamaha YZ 250

4 Answers

Wont start by kick start but will by pull start

sounds like your idle jet is clogged, remove your carb and clean idle jet cause it won't idle or kick start without it...good luck to you friend...Tim

Jun 05, 2009 | 2003 kawasaki KX 125

3 Answers

Kx 125 reed valves

The reed valve assembly should hold solvent withot leaking. Remove for test. Disassemble and clean reeds and reed seat. Perfect seal is very important.

Good luck,

May 17, 2009 | 2003 kawasaki KX 125

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