20 Most Recent 1979 Yamaha XS 500 - Page 4 Questions & Answers

Check the speedometer cable. It should be attached to the front wheel hub and go to the speedometer.

Yamaha... | Answered on Oct 25, 2020

There is a neutral switch and starter circuit relay that disables the CDI module and prevents the starter solenoid from energizing.

Likely your start switch bypass attempt at the solenoid didn't account for the the CDI being disabled, so crank no spark.

You will need to verify operation of the neutral switch and the start circuit relay.

Do an internet search for "ttr225 wiring diagram" if you need a schematic.

Yamaha... | Answered on Oct 17, 2020

I remember these lightweight steeds that had an almost cult following in the UK, resulting in a large number of tuning parts becoming available at reasonable prices.
The noise of a gaggle of them pulling away from the lights all at once could and did break the windows of nearby houses.

The compression pressure of an exhaust tuned 2-stroke engine is necessarily quite low - because the cylinder capacity and the compression ratio "grows" at the rpm the reflected exhaust pressure wave effectively blocks the exhaust port and the engine power suddenly increases. Yamaha engines of that time were notoriously "sudden"...

I don't know the exact compression pressure but I would be happy if I did a test and achieved around 100 psi. My Suzuki of a similar design produced 105 psi on the kick starter. Much more pressure than that and there would be a danger of the fuel detonating in the cylinder when the engine "was on the port", usually resulting in a hole melted in a piston.

Yamaha... | Answered on Oct 16, 2020

If it is on all the time this usually means there is a possible problem with the bike or the engine. You need to get a Good bike specialist to look at this as it could be anything from a faulty sensor to a Serious engine problem. Get it looked at as soon as you can as using it with the light could be making it worse, (by worse i mean expensive).

Yamaha... | Answered on Sep 23, 2020

I had the same problem with my 2016 neos 4. I had replaced the rear brake shoes and ran the bike for a while while it was sitting o the stand. The issue was simple... the engine management system thought that there was an issue with the speedometer as the Speedo reeds the speed from the rotation s of the front wheel. As the bike was on the stand the front wheel, hadn't turned while the rear one was spinning with the engine revved...
the solution was simpler... SPIN THE FRONT WHEEL, Or take the bike for a ride. Sorted

Yamaha... | Answered on Sep 15, 2020

It must be some electrical problem. Either the switch or the electric wires going from the switch. If electricity is cut off nothing would happen. As you say battery is good then we have to check the electrical connections.

Yamaha... | Answered on Sep 13, 2020

Strip carbs and clean

Yamaha... | Answered on Aug 23, 2020

I am guessing you checked that with a voltmeter?

A voltmeter needs only microamps but such a tiny amount of current hardly qualifies as power. A backfeed because of leakage from something will register a voltage, especially with a digital meter but I wager there wouldn't be enough current to light a bulb - which is why I mostly use a testlamp for such checks.

Most modern ignition/engine management systems use more than one supply and internal leakage between them might be normal or might be a fault. Reference to a wiring diagram might help. Certainly if both fuse terminals have real power - that wouldn't be normal.

Yamaha... | Answered on Aug 20, 2020

Carb cleaner fuel additive can be used but only after you have stopped the carb flooding. Gently tapping the carb might do the trick otherwise it will have to be a strip-down.

Carb cleaner is good for removing varnish and other fuel residue but it won't remove insoluble dirt or compensate for wear - carb flooding might be caused by a sticking float valve but most likely it is either wear or dirt.

Yamaha... | Answered on Jul 28, 2020

Buy a clymermanual for complete cycle rebuild

Yamaha... | Answered on Jul 11, 2020

The fact you said you rode it a little before the fuse blew makes me thing arcing at bad or loose connection, damage wire. May look for a spot where rubber insulation around wire is cut and may be arcing off metal somewhere. The diagram show battery + goes through main fuse to regulator and then ignition switch. I think I would start out checking wires and connection from battery to ignition and regulator.
Owners manual wiring diagram page395, 396

Yamaha... | Answered on Jun 27, 2020

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Yamaha... | Answered on Jun 25, 2020

Buya clymermanual for total repair..n gitta good lock for that classic..ibelieve tho it has a steering lock

Yamaha... | Answered on Jun 21, 2020

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