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Yamaha tzr 50cc cuts out when warm

When my bike has been running for 5 minutes it cuts out but will restart then cuts out again

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  • 39 Answers

Overheating ? too much air compaired to fuel ?

need more info for those 5 minuits how does it run

Posted on Oct 30, 2012

  • 9 more comments 
  • leslie richardson Oct 30, 2012

    it runs fine for about five minutes then revs drop off (below 1000rpm) starts running rough and then cuts out

  • markrd125
    markrd125 Oct 30, 2012

    ah ok that sounds more like over fueling am i right in saying starts ok but ur tick over screw is screwed pretty far in to get it to tick over the bike will reve fine but groggy lacks pulling power

  • markrd125
    markrd125 Oct 30, 2012

    lacks pulling power mostly at high rpm ..

  • markrd125
    markrd125 Oct 30, 2012

    i can fix this bike im known as a 2stroke god and i kno the 125 version of that bike inside out ill try to be around as much as possible today to talk here get u through this fix if u like

  • markrd125
    markrd125 Oct 30, 2012

    does the problem get worse or better as the bike heats up ? hows ur spark plug looking does it spark well with a good strong blue spark ? what colour is the plug white ? brown ? black ? is it wet ish oily is it compleatly dry a sparkplug can tell u a whole lot and what air filter are you useing what slot from the top is ur needle clip in im pretty sure the 50 has ajustable needles as standard yes im afraid it does mean u got to go get ur hands dirty

  • markrd125
    markrd125 Oct 30, 2012

    NOTE: A rich problem gets worse as the engine heats up. A lean problem gets better as the engine heats up / rich 2 much fuel / lean too much air

  • leslie richardson Oct 30, 2012

    many thanks i will check the spark plug and filter first (is there any other way of getting to plug without removing the fairing?)

  • markrd125
    markrd125 Oct 30, 2012

    so when i said overfueling this basic rule agrees with me thats a step forward ur almost definatly overfueling my best guess with the info i have right this second is dirty air filter a simple test would be to remove it and try running the bike if it is the filter then the bike will run better then it shuld and be realy pokey if thats true stop runing the bike its not good for it but problem found if no big change tell me a blocked filter wil change your fuel air mix the more clogged it gets the more of the suction from the engine cant **** in air and instead goes for the next hole it can **** from ( your main jet ) creating a over rich mixture that is making your bike run like that if its something else we will get there but it will take a little longer to fix so before you check over all the things ive asked do that test if it does what im expecting then the problem is found

  • markrd125
    markrd125 Oct 30, 2012

    if it is the filter and its now fixed plz let me kno ;)

  • markrd125
    markrd125 Oct 30, 2012

    u shuld be able to simply reach in on the right hand side to get to the plug its a bit tight but easyly done its only the tzr that u need to remove the tank by design and even that if unfaired u can get to it

  • markrd125
    markrd125 Oct 30, 2012

    im pretty sure the 50 u can get to it on both sides right usualy gives u more room to move



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SOURCE: 97 YAMAHA YZF 1000,wont start itself after bike is warm

Have you checked the ground lead?

Make sure it is clean, it runs down and bolts to the top right hand side of the crank case.

Sometimes what happens is, that lead gets grime on it, oil or corrosion.. and it doesn't make good contact. The lights, spark ETC load the crank case and frame full of DC.. when you shut the bike off the dc cant flow through the starter so it won't turn over.

after a while the dc trickles out it will let the bike start again.

Hope thats it and it works for you, good luck!!

P.S. how is he liking his ace?? Awsome bike, I have had mine since 1999, and it not about to go anywhere!!

Posted on Jun 07, 2009

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Remove the water trap bowl at the bottom of the petcock, (gas valve). Any water or trash in the bowl? Drain a cup of gas from the tank. Any water or trash in the cup? Dump it, clean it and re-mount it, ( not all bikes have a water trap bowl ).

Drain the carburetor. There should be a screw on the lower side 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 two screws on the outside throat of the carb and spray into the screw holes as well.
Be sure to put these two screws back in the same hole they came out of. IMPORTANT > do not tighten these two screws down. Only screw these in until they LIGHTLY seat. Now turn each screw one and one half turns outward. Put the rest of the carb back together, clean the air filter and install the carb. Let the float bowl fill then start the engine. Set the idle speed with the idle screw. This process should get you back on the road.

Since you mentioned uneven idle revs, be sure the carb and manifold are on tight and also tighten the cylinder and head. Air leaks can screw up the idle.

Please rate this solution. Thanks speedfreak41

Posted on Apr 04, 2009

  • 3567 Answers

SOURCE: yamaha trx850 bike stopped then restarted no

If they find nothing wrong then the problem is obviously intermittent and can be very hard to find. Check the operation of the ignition switch and all kill switches with a volt ohmmeter. Check the wiring harness. Did a wire come unplugged? Are all wires clean and with solid connections? Any abraded or pinched wires? Is the bike in neutral and the neutral light is lit up? If no neutral light, check the neutral switch and neutral wire connection.
The usual source of intermittent loss of spark is the side stand kill switch. It kills the engine so that you don’t start out with the side stand down. Check for a broken wire at the switch or coupler. Get a service manual and check out the electrical section. Some bikes have a diode controller integrated into the turn signal relay. Try moving the kill switch by hand. If that doesn’t work then wire a jumper around the switch to bypass it. If that doesn’t work, check out the relay.The dealer would / should have load tested the various ignition components. I will assume the ignition system is okay. Check the battery and fuses. Install a new set of stock spark plugs.

Posted on Jun 12, 2009

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SOURCE: I've got Yamaha Fazer 600. The engine cuts off


Posted on Aug 25, 2009

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SOURCE: motorcycle dies while riding,like gas is cut off

Check fuel pump. You might have a bad diaphragm.

Posted on Sep 06, 2009

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