Question about 2010 Yamaha yBR 125

1 Answer

Yamaha ybr 125 starting problems in hot weather

After standing in full sun, it fires and starts briefly then stops. Extra throttle does no good. Had service recently. I have never cleaned the spark plug. Seems that engine is flooding with auto choke possibly so re-starting fails. I leave it for about 10 minutes (still parked in full sun though) and come back to it and it starts. What could possibly be wrong? I don't want to just go and pay for a new fuel pump after reading older models have resolved their starting problems. Many thanks, Mary

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  • Yamaha Master
  • 60,964 Answers

Hi, Mary 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.
https://yamahaclub.com/forums/topic/27520-ybr-125-not-starting-in-warm-weather
Yamaha YBR125 2007 Won start in hot weather otherwise fine
Yamaha YBR125ED 2005 Service Manual
OEM parts for Yamaha
Yamaha YBR125ED Owner Manual

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

Posted on Feb 13, 2017

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5 Suggested Answers

tabbycat282

tabbycat282

  • 56 Answers

SOURCE: 1989 tw200 yamaha won't start

G'day egdbcs . Ok.now lets see.You say good spark,so i'm presuming you are doing the old sight test.Try bending the arm on a know good sparkplug about 5-6mm,earth the plug and kick'er in the guts(crank it over)Be very carefull , high voltage danger.If there's still a good spark it's safe to say that there will also be a good spark under pressure in the combustion chamber,speaking of which you should also do a compression test,anything over 100psi should be ok. as i'm not to sure of the extent of the re-build,hopefully the valves were lapped and checked for straight and true and valve seals replaced,if you notice oil on the tip of the spark plug you could have a leaking valve seal or oil seal .Try putting a small amount of fuel directly into the combustion chamber ,tighten up the spark plug ,install the plug cap and.......Yeah ..You guessed it ..."kicker in the guts".If all the abouve are correct and true it should fire up.If it runs for 5-10 seconds then stops you've got some sort of fuel starvation problem , could be dirt in the carb,blocked idle jet ,or air passage or even the needle could have come off it's clip,believe me with an old bike like yours anything could be worn and loose inside that carby.The only other thing to consider is the timing.There may be a good spark but is it happening at the right time inside the engine???. I'll leave it all in your capable hands EGDBCS.Hope this helps to solving your worries. Chow for now......Tilleydog..

Posted on Jun 03, 2009

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Anonymous

  • 1 Answer

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

Z Laws

  • 375 Answers

SOURCE: Engine revs to full throttle when starting 1100 Yamaha maxim

More likely too much air - runaway revs is indicative of too lean, not too rich. Regardless, it is your carbs causing the problem - strip them down and look - for peace of mind on an 82 bike, I would throw a rebuild kit at them.

Posted on Jun 29, 2009

DoubleClutch

Greg O'Day

  • 376 Answers

SOURCE: yamaha xv 1100 virago

To me it sounds like the coil is breaking down and not working at higher RPM's. You can take them off and have them tested at a service shop.

Posted on Dec 12, 2009

heimlich

David Belcher

  • 1978 Answers

SOURCE: When I start my 2004 Yamaha TTR 225 on full choke

Remove the fuel tank , side covers , and seat. Take your carburetor off , clean and inspect it. Check the carburetor top diaphragm. Make sure all the jets are in place and the passageways through the body are clear as well as the jets are clear. Squirt carburetor cleaning fluid through them. Most of all inspect the intake boot for rips tears and separation. Make sure your mixture screw is set to 2 full turns. Reassemble and your problem should be solved.

Posted on Oct 15, 2010

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Hi, Anonymous for this situation I would call my local dealer or reputable shop's service/parts department and inquire about any possible quick fix, answers, or parts inquiry. 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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Hi, Anonymous and the usual suspects are:
1. Spark plugs in bad condition or have an improper gap or are partially fouled.
2. Spark plug cables in bad condition.
3. Battery damaged or nearly discharged, should have 12.5 volts.
4. Check 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 if necessary.
5. Throttle controls not adjusted correctly.
6. Water or dirt in the fuel system.
7. Water or dirt in the carburetor.
8. Faulty fuel pump.
9. Intake air leak.
10. Fuel tank vent hose and vapor valve plugged, or fuel line closed off, restricting fuel flow.
11. Enricher valve inoperative.
12. Engine lubricant to heavy (winter operation).
13. Ignition is not functioning properly (possible sensor failure).
14. Faulty ignition coil.
15. Valves sticking.
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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https://yamahaclub.com/forums/topic/22523-ybr-125-starting-problems
Yamaha YBR 125 Service Manual
OEM parts for Yamaha
YAMAHA YBR125 Owner Manual

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

Jan 14, 2013 | 2007 Yamaha Ybr 125

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Hi, Anonymous for more information about your question and valuable "FREE" downloads that you will need please click on the links below. Good luck and have a nice day.
https://yamahaclub.com/forums/topic/35549-how-can-i-start-my-yamaha-ybr-125-with-no-key
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Hi, Anonymous may very well be for more information about your question 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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https://yamahaclub.com/forums/topic/22523-ybr-125-starting-problems
Yamaha YBR125ED 2005 Service Manual
OEM parts for Yamaha
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Btw, I’m available to help over the phone in case u need at https://www.6ya.com/expert/gregg_c0ec1df182c7330e

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Hi, Ian before testing any electrical component in the Starter Circuit 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 because your battery may have 12.5 volts or more but little or zero amps causing the battery to be faulty and must be replaced, especially "AGM" batteries.
1. Spark plugs in bad condition or have an improper gap or are partially fouled.
2. Spark plug cables in bad condition.
3. Loose wire/cable connection at one of the battery terminals, especially the "NEGATIVE" cable, check it at both ends, coil, or plug between ECM or ignition module.
4. Throttle controls not adjusted correctly.
5. Water or dirt in the fuel system.
6. Water or dirt in the carburetor.
7. Intake air leak.
8. Fuel tank vent hose and vapor valve plugged, or fuel line closed off, restricting fuel flow.
9. Enrichener valve inoperative.
10. Engine lubricant to heavy (winter operation).
11. Ignition is not functioning properly (possible sensor failure).
12. Faulty ignition coil.
13. Valves sticking.
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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Btw, I’m available to help over the phone in case u need at https://www.6ya.com/expert/gregg_c0ec1df182c7330e

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


Sep 22, 2011 | 2005 Yamaha Ybr 125

1 Answer

2005 Yamaha Ybr 125 hard starting and idling


Hi, Tomvarley92 and the usual suspects are:
1. Spark plugs in bad condition or have an improper gap or are partially fouled.
2. Spark plug cables in bad condition.
3. Battery damaged or nearly discharged, should have 12.5 volts.
4. Check 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 if necessary.
5. Throttle controls not adjusted correctly.
6. Water or dirt in the fuel system.
7. Water or dirt in the carburetor.
8. Intake air leak.
9. Fuel tank vent hose and vapor valve plugged, or fuel line closed off, restricting fuel flow.
10. Enricher valve inoperative.
11. Engine lubricant to heavy (winter operation).
12. Ignition is not functioning properly (possible sensor failure).
13. Faulty ignition coil.
14. Valves sticking.
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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Yamaha YBR125ED 2005 Service Manual
OEM parts for Yamaha
Yamaha YBR125ED Owner Manual

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

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