Question about Yamaha XS 650 H Motorcycles

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1989 yahama fzr wont start

Bike was back fireing so i took air cleaner off and looked in carb. bowls with light out and saw spark - but it was intermittent. Tried bunch of times to start but got a suction sound with a back fire. After a bunch of times trying to start i dont even see a spark in the carbs. now. I checked main fuses. All fuses are good. I have a book on bike and i was checking coils and got reading of 2.8 ohms. Is that ok? Also the book said to check Diode(relay assembly) for continuity. I put ohm tester on blue/yellow terminal and skyblue terminal and found no continuity. Is this why bike wont start? Bike turns over but it wont start!

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  • omegia Jul 27, 2009

    I am checking for continuity on the ign. diode(relay assy.) (part to right of main fuse)and not getting any continuity(open). A diode should show continuity if it is good! I get nothing. I have room pitch dark with carbs. open and dont see spark. I saw spark first few times i tried to trouble shoot, but now i see no spark. So can this relay affect fireing of plugs?

  • omegia Jul 30, 2009

    Well after all my problems i tried to start bike and it fired up. Spooky or so i thought. I took bike for a spin when i returned i left bike running for a couple min. and noticed a fuel leak. Changed fuel line. Problem solved.
    Thanks everyone for u r help!

  • thomasnee May 11, 2010

    Do you mean that you looked in the carbies and saw spark???Check the timing 1st

  • Paul Blessing May 11, 2010

    diodes pass voltage in only one direction. Coil reading may be good. Can't you check spark at the spark plug to cylinder?

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Could be the diode. They will read in one direction only coils sound ok

Posted on Aug 02, 2009

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I just bought a 1991 yamaha fzr 600r and the previous owner said that the stator needed replaced and that's why it wouldn't start . I went to order the part and the parts store said he doesn't think it's...


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My suzuki gsxr 750 sat all winter and i didnt winterize it at all. the battery died... i charged it and my bike just wont start. It cranks over just won.t start. What should i do?


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Don't do the gas down the spark plug thing. It's a bad idea. Do the following >
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Drain the carburetor. There should be a screw on the lower side or bottom of the carb float bowl. Remove the screw then replace it after the fuel drains. Turn the gas back on and wait a minute for the carb to fill with gas. Install a new stock NGK spark plug and try to start the engine. If the bike doesn't start and run properly then shut off the gas and remove the carburetor from the engine.

Remove the float bowl and clean the entire carb with a spray carb cleaner from the auto parts store. Wear protective goggles to avoid getting spray in your eyes. Spray into all the little airways and fittings in the carb. Remove the idle screw and the air screw on the outside throat of the
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< < READ CLOSELY > >
Be sure to put these two screws back in the same hole they came out of. IMPORTANT > do not tighten these two adjusters down. Only screw these in until they LIGHTLY seat. Now turn each adjuster one and one half turns outward. Put the rest of the
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Please rate this solution. Thanks!

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1 Answer

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< < READ CLOSELY > >
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2 Answers

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Doing this should get you back on the road.
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2 Answers

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Keep the cool aftermarket product stickers on the bike. No one will ever know.

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1 Answer

My 1991 yamaha fzr 600 wont start


how long did you let it sit for with gas in the carbs, you may have clogged up your jets. after awile gas will break down and turn into varnish, if your bike trys to push the varnish through the system it will clog the jets. try to take off your seat then remove your plastic over the gas tank. remove the gas tank and you will see four bowls *silver ones right next to where the gas tank is on the carbs*. your bowls are in sets of two. there are drain screws on the bowls to remove the gas inside. remove the 16 screws holding the bowl onto the carb. *4 on each* inside you will see your floats and jets. carefully loosen the jets with a screw driver then finish unscrewing them by hand, they are brass and very soft. you should be able to hold up the jets to the light and see a small pin hole. if not get some carb cleaner and give them a squirt and blow them out. do not try to use anything to clean them out, they are very very sensitive and one knick will change the jet. after that i would spray some carb cleaner up the jet holes and try to clean them out also. if you have a compressor it would be wise to use that to blow out the gunk from the jet holes as well. after you run threw all 8 jets put them back together and see how it goes, if nothing you may have to check the jets again and if clogged again your carbs are gunked up and will need to be cleaned

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3 Answers

Bike wont start


Hi,

Initially, pls check/verify:
  • left ignition coil goes to #1 & #4 plugs while right ign coil supplies 2 & 3;
  • presence of spark on each and all of the plugs;
  • temporarily remove the air cleaner/filter box/assembly and cover each crb opening with the palm of your hand while cranking. presence of gas would be noted with fuel on your palm;
  • engine flooded. remove, clean, dry/replace plugs.
Incidentally, if no spark on plugs, check connectors to CDI, or starting with the clutch lever pulled.

Hope this be of initial help/idea. Pls post back how things turned up or should you need additional information. Good luck and kind regards. Thank you for using FixYa.

Nov 13, 2008 | 1990 Yamaha FZR 600

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