Question about Yamaha Motorcycles

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I have a 82 yamaha yz490 thats has spark but wont catch the gas goes into the exhaust whats the problem? its a 490cc but its not on your list

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  • Yamaha Master
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Hi, Couturechris and the usual suspects are:
1. Dirt or other foreign matter between float valve and its seat.
2. Float valve sticking.
3. Float valve and/or valve seat is worn or damaged.
4. Float misadjusted.
5. Float cracked, leaky or damaged.
6. Excessive "PUMPING" of hand throttle grip.
For more information about your issue and valuable "FREE" downloads that you will need please click on the blue links below. Good luck and have a wonderful day.
1985 YZ490 jetting
ViragoTechForum com
YAMAHA YZ490 REPAIR SERVICE SHOP MANUAL DOWNLOAD Download Manuals Technical $10
OEM parts for Yamaha
http://mybikemanuals.com/yamaha/yamaha-it-owners-manuals

Posted on May 27, 2017

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6ya6ya
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Posted on Jan 02, 2017

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SOURCE: my 82' yamaha maxim 400's seat wont openhelp meoppen it

i have this bike too. There's a small compartment on the back, you need a key to open it. There's a little sliding bit that hides the keyhole. open that up, there's two wingnuts holding the seat on.

Your bike may be different, there's several different versions of this bike that i've seen. This is how it works on mine.

Posted on Sep 17, 2009

  • 105 Answers

SOURCE: yamaha xt 125r wont start up

hello, check and see if plug is firing a blue color, if not you may need a stator-pickup coil, i have a 2000 warrior, it is firing, orange and white color, stator neede to be replaced, pickup coil was going out, also check ign coil, these have a problem with getting weak after a while. most likely it is your stator pickup coil, no blue fire from plug, no running the motor. my stator pickup coil was going out. no blue fire from plug, i was told by a yamaha mechanic, no blue fire from plug it will not run, has to be blue, not orange or white looking fire.make sure carb is clean and all jets inside are clean, and air passage ways

Posted on Feb 25, 2010

  • 3 Answers

SOURCE: 82 550 maxun yamaha weak spark wont start good

voltage regulator or ur stator might be bad.Also check fuses.

Posted on Mar 21, 2010

  • 10 Answers

SOURCE: 1986 yamaha 350 xt wont

make sure its getting fuel then check to see how much compression it has it might have a tight valve

Posted on Jun 11, 2011

dmsr63
  • 2050 Answers

SOURCE: I have a 1986 Yamaha yz490. it ran great until it

Your cylinder is probably full of fuel, becareful here. Disable the spark and kick it over with the spark plug out to remove the fuel.
Your problem sounds like a stuck float in the carburator. It needs to be removed and cleaned out good.

Posted on Jul 16, 2011

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Hi, Anonymous and the usual suspects are:
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I have a 1986 Yamaha yz490. it ran great until it sat for two years when i went to start it it felt like it wanted to start. I replaced the spark plug and replaced the fuel filter. when i kicked it over i...


Your cylinder is probably full of fuel, becareful here. Disable the spark and kick it over with the spark plug out to remove the fuel.
Your problem sounds like a stuck float in the carburator. It needs to be removed and cleaned out good.

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Hello, Do you no the spark plug gap for a 85 model yz490 Thankyou boyzoy.


Yes you do off the top of my head I would have thought about0.9 mm. Hope this has helped.

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Kick start wont move


Oooh that's bad, there are a couple of options. The best case senario is that your carburator floats got stuck down allowing the fuel to fill up the cylinder and exhaust pipe. This creates too much compression for the piston to move inside the cylinder. You can check this by pulling the spark plug (MAKE SURE THE BIKE IS OFF!!!) then kick it over. If fuel sprays out of the plug hole then you're in luck. If you don't turn the bike off first, the spark plug will ignite the gas squirting out of the hole and catch on fire... I know from experience. Tip the bike over and let it drain out of the exhaust and plug hole of the cylinder. If the kick starter will not move with the plug out then it's time to remove the flywheel cover. With the flywheel cover removed and the plug out, try turning the flywheel. If it turns then the kickstarter gears are jammed or broken. If it doesn't turn, then the piston or the crank is seized. Good luck.

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the exhaust gaskets really should have nothing to do with whether your engine will not start. However I assume that by not starting it is turning over smoothly like it should when you try to start, having covered that most motors will not start because no fuel, no spark, or no air not withstanding some major mechanical failure in the valve train or timing or piston, cranks et al..
Trying checking for the obvious first fuel, spark, air flow. then go from there hope this helps

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