Question about 1990 Yamaha YX 600 Radian

2 Answers

Radian idles high at 4 g then drops down to 21/2 g then dies

Radian yx 6oocc bike leaks gas running down the frame to the back and from carborator on the same side but does not leak all the time i adjusted the idle screw does not leek gass any answers runs good then dies again and does not restart....any answers?

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2 Answers

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  • Expert
  • 149 Answers

Your Radian has 4 Mikuni carbs. If just one has a stuck float or one set incorrectly it will overflow with gas and run out. The bike will run poorly if at all. You need to pull all the carbs and clean them thoroughly. Check you r fuel line too for leaks and cracks. Make sure your air filter is clean and the boot going to the carbs from the airbox. Check the boots on both sides of the carbs for cracks. Air leaks can cause the idle issues you describe but you have to fix the overflowing carbs first which might fix all of it. Make sure you have a nice large work area, don't lose the small jets or strip the bolts. This answer is directly for your issue you have presented. Good luck!

Posted on Mar 03, 2017

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  • Yamaha Master
  • 57,709 Answers

Hi, Daniel and the usual suspects are:
1. Throttle cables improperly adjusted, pinched or need lubrication.
2. Idle adjusting screw needs to be backed off.
4. Air fuel mixture adjusted too lean start with 2 full turns.
5. Intake system air leak.
6. Fast idle choke ramp is not releasing.
7. Broken throttle return spring.
8. Damaged diaphragm or slide.
9. Faulty MAP, TPS, ATS, O2, sensors or wiring/connector
10. Multi carburetors not in sync.
For more information about your issue and valuable "FREE" downloads that you will need please click on the links blue below. Good luck and have a wonderful day.
Yamaha 1986 YX600 Radian High Idle
1986 Radian SUPER high idle
Yamaha YX600 Service Manual
OEM parts for Yamaha
http://www.badrad600.com/Radian%20Manuals%20-%20Complete%20-%20Printable/Radian%20Owner's%20Manual%20Clean%20Complete%20Final.pdf

Btw, I’m available to help over the phone in case u need at https://www.6ya.com/expert/gregg_c0ec1df182c7330e

Posted on Mar 03, 2017

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6 Suggested Answers

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Posted on Jan 02, 2017

  • 1 Answer

SOURCE: hesitation problems 2003 yamaha wr 450 f

sounds like a jetting issue. change the main jets starting from the largest one you own and work your way down.

Posted on Dec 14, 2008

neogil22
  • 36 Answers

SOURCE: sumthing is wrong with the carburator

hi,
to get a good combustion inside the engine, you(engine) needs fuel-air mixture, since it leaks fuel the mixture is too rich on air. Where does the carb leak? maybe it's just the connection that leaks...I mean where the fuel line connects to the carb, If it leaks there it also sucks in extra air instead of fuel, and therefor the engine doesnt run smooth, choke or no choke, that makes no difference. Check that and if it leaks there just change out the fuel line with a new hose.
It could also be the little rubber ring that seals of the carb, If it leaks from the top of the carb...it's the little ring. Take off the top of the carb and check the condition of the ring, if faulty.. replace it with a new one.
Hope this helps....can be pretty dangerous riding around with a leaking carb... Good luck, Gilbert.

Posted on Mar 05, 2009

num1wrench
  • 14 Answers

SOURCE: bike idles, but with a little throttle it jumps to high rev and wont come back down to idle

You need to oil your cables first....They make a gadget to help you do this...it clamps around the end of the cable, and you spray oil into a provided hole for a spray nozzle tube...Then see if the cables are unstuck by turning the throttle grip back and forth for awhile....start it and see if that helped....if not you may need to replace the cable(s)...I doubt that the slide in the carb is hanging up...or valve.If this doesn't work notify me.

Posted on May 10, 2009

  • 71 Answers

SOURCE: 1986 Yamaha Radian stops running after 20 minutes

Sounds to me like it could be a few things... pretty interesting that it runs and shuts down...sits for a little while then fires back up. Could be something as simple as a bad ground.. maybe it needs cleaned.. if the ground is making very little contact.. the bike would run bad, and because its direct current it has to flow. The metal in the motor frame etc will hold so much DC current.. but *** soon as it load up the bike would stop sparking. Let it sit for a while, DC trickles into the battery through the slight contact, bike fires back up. OR could be bad venting of your fuel tank, or a partial clog at the pet ****.. the first is pretty easy to check, open your fuel cap and start the bike..if it does the same thing then its not a vent problem. One thing that does happen on the Radian, is the reserve fuel screen inside the tank comes loose, and then everything inside the that has built up over the years either partially clogs the pet ****, or the hose, or both. Take the tank off, pull the pet **** off..if it still has two intact tubes with good screens..you probably don't have any junk in your line..but I would pull the line off and blow through it any way... it could be some type of blockage, when the bike sets the fuel seep through, but when it runs it eventually creates a vaccuum that stops the fuel flow. Those are my two first thoughts... good luck!!

Posted on Jun 07, 2009

  • 3567 Answers

SOURCE: 1974 TX500, high idle, white smoke from breather tube

The idle problem is a lean fuel mix caused by an air leak in the intake system. Bad gaskets /seals on the intake manifold, bad valves, bad piston rings, loose spark plugs, and bad head gasket are all things that can lean the fuel/air mix. The smoke indicates a need for new rings. I would have the cylinders bored then install new pistons and rings. Now finish the top end work by getting a valve job. You should get a liquid fuel tank liner to eliminate any rust problems in the future. Also, install an in-line fuel filter. Google “ kreem fuel tank liner “ or go to www.http://www.4secondsflat.com/Fuel_Tank_Sealer.html


My complements on the well cleaned carbs. Do the work mentioned above an you will effectively have a new engine.

A “very helpful” rating for this answer? Thanks!


Posted on Jun 11, 2009

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1 Answer

Cleaned carbs on 1989 Radian 600, now idles at 6-8K RPM. Please help.


Please check the following:
- Throttle control cable adjustment.
- Foreign matter in throttle plate.
- Fuel line clogged.
- Water contamination in fuel.
- Vacuum leaks in the intake manifold or at the carburetor.
- Carburetor base gasket or seal.
- Air/ fuel mixture adjustment.
- PCV valve.
- Valve clearance.

May 08, 2014 | 1989 Yamaha YX 600 Radian

1 Answer

Hello im having a problem with my 1991 radian 600, it starts fine with choke full, then i let it warm up, turn choke down and it dies


Your carb jets are dirty and/or you have a vacuum leak creating a lean condition. Clean and sync the carbs.

Aug 07, 2011 | 1991 Yamaha YX 600 Radian

1 Answer

I have a 1990 Yamaha Radian 600 and I recently got the bike running again, however after riding the bike for a couple of days I noticed my garage was reaking of gas vapors. Last night I took off the gas...


I used to work with a guy whose competition bike used only ethanol. The benefit was an extremely high compression ratio could be used but not so much that the fuel had a higher octane rating but because it had a lower calorific value and therefore a great deal more fuel was needed and it had a huge cooling effect on every fresh charge - so in effect it had a minor supercharging effect as a super-cold charge is more dense.
Because such a large quantity of fuel was needed the standard carburettor jets were useless and he had to modify his by drilling them a much larger size.

I think running with 15% ethanol could leave the air/fuel mixture a little on the weak side but if it starts and runs ok why worry...
The usual rule-of-thumb is petrol can be corrupted by up to 10% on a temporary basis without modification...

I am not familiar with the fuel tap used by your bike. Historically all the spare parts were available for quality fuel taps but these days is anyone's guess - you need to ask the Yamaha dealer. You could be lucky as there is often a requirement to clean the interior of a motorcycle fuel tap during routine maintenance and so gaskets, fibre washers and o rings could be available.

Mar 23, 2017 | 1990 Yamaha YX 600 Radian

2 Answers

Have gas getting into crankcase, what would cause this? petcock?


Hi ,,,a petcock that is not closing can cause this, also if there is gunk in the carbs in the float needles,,will also cause this.

Mar 23, 2011 | 1987 Yamaha YX 600 Radian

1 Answer

WHEN I PUT MY BIKE IN PRIME POSITION IT LEAKS!!!


Hi and welcome to fixya,

you'll need to change the gasket of your fuel ****.. or better change the entire fuel valve so save you time from finding the right gasket for the valve.

hope this info helps

Dec 28, 2010 | 1987 Yamaha YX 600 Radian

1 Answer

Radian revs really high and shoots gas out of airbox


manifold leaking. check carb to head gaskets and any vacuum lines that it has

Oct 03, 2009 | 1987 Yamaha YX 600 Radian

1 Answer

Idles high smell of gas


maybe a sticking float. run a 1/4 can of Seafoam from autozone to two gallons gas. ride bike for at least 10 miles and get on it a little... this might fix your problem.

Oct 03, 2009 | 1989 Yamaha YX 600 Radian

1 Answer

Leaking gas and gas mixing with the oil


Can you tell were about the leak is coming from ?

Aug 13, 2009 | 1990 Yamaha YX 600 Radian

3 Answers

1986 Yamaha Radian stops running after 20 minutes


Sounds to me like it could be a few things... pretty interesting that it runs and shuts down...sits for a little while then fires back up. Could be something as simple as a bad ground.. maybe it needs cleaned.. if the ground is making very little contact.. the bike would run bad, and because its direct current it has to flow. The metal in the motor frame etc will hold so much DC current.. but *** soon as it load up the bike would stop sparking. Let it sit for a while, DC trickles into the battery through the slight contact, bike fires back up. OR could be bad venting of your fuel tank, or a partial clog at the pet ****.. the first is pretty easy to check, open your fuel cap and start the bike..if it does the same thing then its not a vent problem. One thing that does happen on the Radian, is the reserve fuel screen inside the tank comes loose, and then everything inside the that has built up over the years either partially clogs the pet ****, or the hose, or both. Take the tank off, pull the pet **** off..if it still has two intact tubes with good screens..you probably don't have any junk in your line..but I would pull the line off and blow through it any way... it could be some type of blockage, when the bike sets the fuel seep through, but when it runs it eventually creates a vaccuum that stops the fuel flow. Those are my two first thoughts... good luck!!

May 27, 2009 | 1987 Yamaha YX 600 Radian

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