Question about 2003 Yamaha YZ 250

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My Motorbike a 2 stroke yamaha hasnt been ridin in years and it has no compression when u try to start it how to i give it more compression ??????

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Check for any compression leak if no then change the piston rings.

Posted on Apr 09, 2011

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HOW MUC COMPRESSION SHOULD A YAMAHA 1993 BADGER 80 HAVE


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Yamaha yz80 2 stroke or a4 stroke


2001 Yamaha YZ80 Specifications Engine Engine Type
2-stroke Displacement
83 cc Bore x Stroke
47 mm x 47 mm Compression Ratio
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Liquid Carburetion Carburetor
26mm Mikuni Transmission Transmission
6 - speed Chassis Wheelbase
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1 Answer

I have a 1993 2 stroke 40 hp mercury outboard motor and it seems that whenever you start it you need to use the choke, even when it's been running for some time and warm. Is that normal for these motors?...


Use it .It is a common thing with 2 strokes.Outboards have water in them and cool down quicker than say a 2 stroke motorbike. They have no water and keep the heat in the engine longer.If it runs well,,don't spend the money.All the choke does is gives the motor a slightly richer air/fuel mix at startup.It cannot hurt the motor.Hope this helps

Jan 05, 2010 | Boating

1 Answer

L was driving my boat and the out board motor stopped l tried to start it but it smelt like it was flooded .l pulled the spark pulgs out cleaned them and tried to start the motro without the spark plugs to...


If i had year make and model I could give you detailed instruction. You can do a few simple test to make the troubleshooting easier. Tools(1) A compression gauge (2) a spark gap tester.(3) A Clymer service manual for your engine. (you can purchase from your local dealer). I know all these are expensive but if your going to be a outboard owner you will always need them. Troubleshooting (1) check compression. without the year make and model I'm giving you a average numbers. Look at your Clymer manual for exact numbers. all cylinders need to be over 100 lbs and equal each other within 5 lbs.(2) check spark. use a spark gap tester all cylinders should jump a half inch gap. if you have good compression and good spark, fuel is the problem nine times out of ten.Ethanol gas is proven to stay stable in fuel systems for only 30 days in 90 + degree heat. It turns to a gummy residue called varnish. It clogs up carberators and fuel injection system. I don't know year make and model so i dont know what fuel system you have. clean fuel lines replace primer bulb and replace all fuel filters. Yamaha has a gravity filter under engine cover clean it. mercury fuel injected outboards has a canister fuel filter under engine cover. Finally replace spark plugs, I know spark plugs probably don't look bad but this is a outboard. Fresh spark plugs means less resistance for the ignition system. The ignition system is week compared to automotive. Test drive boat, if the problem is still there then there is further steps to take. Again I don't know the year model so I guessing on fuel delivery system. Pull out your clymer manual. what is great about the Clymer Manual for Novice techs is it gives detailed info on your outboard. Troubleshooting tips and teaches you how your outboard works.

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1 Answer

125 wont start


hello
that does sound very similar to a loss of comrpession. usually what happens when you lose compression, and you load the cylinder up with fuel the plug starts to ignite it a little and does not actually combust. i would still definately reccomend sticking a comrpession gauge on it to make sure though.

Mar 27, 2009 | 2003 Yamaha YZ 125

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1997 yz 125 wont start, please help


2 stroke bike are very dependent on compression. and being a bike that is 12 years old my best educated guess is that the top end needs to be rebuilt. i usually have to have the top end done on my honda about every three years.

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1 Answer

Catalytic Converters


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