Question about Yamaha YZ 125 Motorcycles

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I have a 1994 XC125/Z Yamaha Riva Scooter. It will not start without Ether when it is cold. Once it warms up, it starts immediately. Once started, it runs fine, idles smoothly, operates well at both high and low speeds; has lots of power; and accelerates smoothly. I have rebuilt the carburetor, cleaned all the ports etc with carburetor cleaner, checked the adjustment of the float, exa,omed the condition of the gaskets, checked all hoses, etc. I believe the carb to be clean and free of varnish etc. Where do you think I should look for the problem? What solution(s) can you suggest?

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  • Yamaha Master
  • 41,614 Answers

Hi Hdbalb, I believe you have an enrichner or choke lever issue and I am sorry you can't find the first and best tool you ever bought for your Harley but despair not for a mere $15.00 you can download another one. For more information about your issue, please visit the websites below. Good luck and have a nice day.
1994 Yamaha Motorcycle Service Repair Manuals

Posted on Oct 04, 2015

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Posted on Jan 02, 2017

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SOURCE: Strange thigs about YAMAHA TW 125

Hi
I have been working on my carb today,the pipe from the bottom of the carb should just run down by the bottom of the swinging arm,there should be another pipe from the pipe on the left side of the carb just above the fuel intake which also runs down to the swinging arm and connect to nothing.
Cheers

Posted on May 30, 2009

  • 61 Answers

SOURCE: took apart carb cleaned and now there is no mid or high range

did u install new gaskets, the engine might be sucking air from outside the carbs. u can use a propane torch (not light) spray a little around outside of the carbs, see if engine sounds different, if it does... leaky gasket.. u might check there is no unplugged vaccum hose.

Posted on Jul 27, 2009

  • 1 Answer

SOURCE: 2001 yamaha ttr 250, starts, idles ok, bogs at acceleration

I have the same bike and same problem. Check the intake hose that connects the carb to the motor it may have a crack mine did and lost power when the bike warmed up. They don't make a replacement hose for it so I am using a rubber plumbers coupling with hose clamps. Might work? The hose is inch and a half diameter and about three inches long try that maybe. Good luck If it makes a chirping sound when the bike gets warm it's probably that hose sucking in air and screwingup your mixture.

Posted on May 06, 2010

  • 3567 Answers

SOURCE: Carburator problems- jets varnished up, runs on full choke only

Disassemble the carb and soak the entire carb in denatured alcohol. A bit of vibration will help to break up the varnish. The alcohol will eat the varnish in 15 minutes or so. Now finish with spray carb cleaner and an air hose. Concentrate on the pilot jet. Spray into every fuel circuit ( hole ) you can find.

Posted on May 18, 2010

  • 1 Answer

SOURCE: Yamaha 2001 ttr 250. Bogs above half speed, under load

I have the same problems with my 1999 TTR 250, were you able to find out anything?

Walt
goalhawk@hotmail.com

Posted on Aug 07, 2010

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I have a Yamaha riva 125, it was runing fine til the battery went dead(maybe because the alternator maybe about to die) so i would just jump it off to crank it and keep driving. but now it wont start at...


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Test one or two Glowplug wires with a Testlight and see what kind of Spark you have. If the spark is present you need to pull about half of your Glowplugs, if not all, and Test them with Battery voltage. They should be uniform in glowing and be careful not to melt them. Any Glowplug that remains cold or sluggish should be replaced. If no Spark, then check the Timer or replace it. Some models may have a Relay, check with Autozone or Oreillys or similar for parts listing.

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Hi, Cb350four before testing any electrical component in the Starting System it is "IMPERATIVE" that you have a fully charged battery of 12.5 volts or more and be able to pass a proper "LOAD" test if necessary, you may have a preliminary reading of 12.5 volts or more but little or zero amperage, the battery is faulty and must be replaced. AGM type batteries fall into this scenario more so than lead acid batteries.
1. Ignition Switch not in the "ON" position.
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3. Check the battery terminals for damage or corrosion check the battery cables at "BOTH" ends for loose, corroded, or broken connectors, "INSIDE" and outside the cable harness, perform connector wiggle test and check cables with an ohmmeter.
4. Bank angle sensor needs a reset or is faulty.
5. FOB battery low or dead.
6. Faulty ignition switch.
7. Faulty starter button.
8. Faulty kickstand, clutch, neutral safety switch.
9. Security alarm needs a reset.
10. Starter relay, solenoid, starter have failed or circuit wiring faulty.
11. Starter armature or field coils have failed.
12. Main fuse or circuit breaker may be blown or faulty.
13. The electric starter is working but starter clutch has failed.
14. Check for engine trouble codes.
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