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How to Adjust carb for yz490 - Motorcycles

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Get a service manual, adjusting the carb can be tricky. Go to dealer and talk to the service dept. Most will be happy to help you and give you copies of the adjustment section off the manual.

Posted on Nov 06, 2014

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Hi, Jeremiah and the usual suspects are:
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1982 yamaha yz490, I checked the fuel flow and all is good? It has 120 psi compression? And I put a new plug in but still wants to run for a few seconds then die? When it's not running It also leaks...

If it's leaking from the bowl drain, the drain screw isn't seating in the drain hole. Shut the gas off, pull it out and clean the tapered seat it seals in. I know you said you cleaned the carb, but if the float needle isn't seating, it would leak out the overflow and flood out the carb as well. Check out the float-if it's brass, shake it and listen for gas inside. If it's plastic, put it in a cup of gas and see if it floats. They do get saturated over time and need to be replaced. Good luck!

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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

Hi, Couturechris and the usual suspects are:
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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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Whats the best and easiest way to set the carbs on a 1990 yamaha radian yx600

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