Question about 1999 Yamaha YZF-R1
Hi, Tom if your headlight is not working, keeps burning out, blinking, or is dim the first thing you need to check is the headlight bulb for damaged filaments then check your light circuit fuse, then check your head light bulb socket ground wire for a clean tight connection, that being said the usual suspects are:
1. Faulty ground or power supply wire to headlight bulb socket.
2. Worn down solder contacts or loose fit of the bulb base in the socket due to vibration.
3. Worn, chaffed, or broken wires in the light circuit.
4. Corroded, broken, or loose pins/sockets in wire connectors.
5. Faulty hi/lo beam switch.
6. Faulty ignition switch.
7. Fuse is good but no continuity on both sides.
8. Faulty wiring between battery positive and headlight bulb socket.
9. Weak charging alternator/generator.
10. Faulty voltage regulator/rectifier ground or overcharging.
For more information about your issue and valuable "FREE" downloads that you will need please click on the links below. Good luck and have nice a day.
R1 1999 speedo problem
1998 1999 Yamaha YZF R1 Service Manual R1 Moto Data Project
OEM parts for Yamaha
Btw, I’m available to help over the phone in case u need at https://www.6ya.com/expert/gregg_c0ec1df182c7330e
Posted on Aug 29, 2016
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Posted on Jan 02, 2017
clean the carbs, you have a sticky float allowing too much gas into the chamber thus overflowing.
remove air cleaner and box, whatever you need to do to get to carbs, get a good spray cleaner and get a load in them, put it back together but leave bike to sit overnight try starting after 24 hours
Posted on Apr 10, 2009
SOURCE: headlight 1972 yamaha 250 yz
You can add a headlight if the type of ignition system on your particular model is the type that will let you. Several different systems were used back then. The proper system will need a lighting coil installed onto the plate underneath the flywheel. The flywheel must be pulled off. You will see a coil there already for the spark. An unused set of threaded screw holes is present, (the same plate was used on the bikes that had a headlight). Just add the coil and now you have power for a headlight.
Posted on May 05, 2009
SOURCE: Bike won't start, battery bulged
Chances are it is the rectifier/regulator which is a sealed unit that has to be replaced if faulty. A bad one can cook your battery as well as your light bulbs and wiring. To check this connect a VOM across your battery terminals while the bike is running. If normal you should see about 13.5 volts. If your voltage climbs up to the 18 to 22 volt range or higher you must replace the part before you do further damage. Also be aware of the dangers of over charging a battery as it can explode and cause personal injury. If your battery has been cooked you will have smelled sulfuric acid and the battery will become hot to the touch. If that is the case you will also have to replace the battery as well as it will no longer hold a charge. When this happens the battery will bulge and this is called plate bow. By replacing both the battery and the rectifier/regulator you should be as good as new. In very rare instances it could be the stator which could cost a lot more but chances are its just the rectifier/regulator. I've seen them for very cheap prices on Ebay.
Posted on Aug 01, 2009
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