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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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1985 yz 490 head bolt torque specs


Hi, Don sorry you can't find the first and best tool you ever bought for your Yamaha despair not for a mere $10 you can download another one. For more information about your issue and valuable free downloads that you will need please visit the websites below. Good luck and have a nice day.
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Got a 86 yz 490 I live n mn and don't have jetting specs also only starts when cold buy pouring gas down the cylinder after it starts it fired back up n one kick everytime what gives?


Hi, Jeremiah and the usual suspects are:
1. Enrichner system plugged, not properly functioning or improperly operated.
2. Fuel overflow.
3. Restricted fuel supply.
4. Plugged slow jet or passages.
5. Inlet system air leak.
For more information about your issue please visit the websites below. Good luck and have a nice day.
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Head and cylinder head torque for 89 yz490


Hi, Anonymous 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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Echo pb250 blower how to adjust carb.


the new carburators do have adjustments but consumer is not allowed to adjust do to epa regulations find an echo dealer or echo repair tech with tools to do job everyones answer is carb clean carb clean damages diaphrams and seals in carb never use carb clean on lawn and garden equipment.

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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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Put new carbs on. Having trouble tuning air/petrol mix and syncronising the carbs.


need vacuum gauge, take one carb and adjust till highest vac setting. then match next carb to first carbs settings (same vac) if u can't match adjust first carb to 2cd carb's highest vac setting. make sure engine is warmed up first.then ride

Apr 03, 2011 | kawasaki ZL 1000 A1 Eliminator Motorcycles

1 Answer

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:
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.
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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


Your problem is probably the sycronizing as long as you havent messed with the fuel screw or jetting. If you dont have a set of vacuum guages you can eyeball the slides in the carbs to at least get you by and you can usually get them pretty close. Find the carb that is directly linked to the cable. the other carbs are adjustable to that carb so you need to make all the other carbs identical to that one. Look at the gap from the bottom of the slide to the bottom of the bore of the carb on that base carb with the throttle at idle bike not running. With the adjustments on the linkage to the other carbs adjust the other slides to the same height as that base carb as close as you can. Measure if possible to get all the carbs as close as possible to each other. you may have to adjust the idle after. If the adjustments on the carbs are all cables, for example there is a cable to each carb directly connected to the slide just adjust each cable accordingly and achieve the same as above. make sure you have a little freeplay at the throttle when you are done. you can adjust that by the cable adjustment by the throttle which will keep all the carbs in sync

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