Question about 2005 Yamaha Ybr 125
Iv seen loads of issues with idling and starting ybr 125s. would it be carbs, piston, fuel jets, oil...? mine has all known problems and its getting worse :(
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.
Yamaha YBR 125 will not start
Yamaha ybr 125 idle ajustment
Yamaha YBR125ED 2005 Service Manual
OEM parts for Yamaha
Yamaha YBR125ED Owner Manual
Posted on Jun 12, 2017
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Posted on Jan 02, 2017
SOURCE: Front sprocket
Hi ........... One tooth less will give you more top speed (if you can pull top revs) but will reduce accelleration. If you go for one tooth less you'll need to tighten the chain and/or remove a link. It's a trade off ............ decide what you want the bike to do.
Posted on Dec 24, 2008
Take the wheel off and remove the brake hub. Now clean out all the dirt and mud from riding in the creek and through mud puddles. The brake shaft has dried mud on it and can not rotate freely in the hub. You will probably need a plastic hammer to punch it out of the casing. clean the shaft and the casing hole the shaft goes through. Grease the shaft with waterproof grease.
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Posted on Mar 29, 2009
Pull the slide out and then move the clip on the jet needle one notch lower. Also try two notches to see which helps most. This will richen the mix in mid-range.
Pleas rate thia answer. Thanks v222407! :)
Posted on Apr 15, 2009
SOURCE: yamaha ybr 125 top speed
Not much to start with here unfortunatly mate. A free flow muffler will help top end speed, change the factory airbox to a K&N style pod air filter, other than that, hugging the tank at top speed :) If you do change these parts, you may also need to increase the main jet size to richen up the mixture for better tuning of the motor with the better flowing parts. This bike has a top speed of 100kmp and produces 10 hp, so you may only expect to get at best less than 1 extra neddy, and perhaps another 5 km/hr.... I suggest upgrading to a bigger machine of you feel the need for speed :)
If its 125's you are into, test drive a Honda CBR 125R 6 speed fuel injected 13.4 horsepower, and good for 120km/hr
Posted on Jul 10, 2009
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