20 Most Recent 1979 Yamaha XS 500 - Page 9 Questions & Answers

open gearbox,maybe the gearbox brokeafter the chain fell off

Yamaha... | Answered on Jul 09, 2019

May hav vacuumleak..titen bolts n chec hoses. Fuel dilivery or carb/inject issues. Ign parts may b gittn hot from wear..let bike cool to confirm

Yamaha... | Answered on Jul 03, 2019

Remove and clean battery cables, if that does not work look at a replacement battery. Another test is to turn headlight on if possible and observe, if it goes dim replace battery.

Yamaha... | Answered on Jun 30, 2019

If it still runs and rides I would think timing chain. If it was coming from the clutch I wouldn't think it would still pull itself.

Yamaha... | Answered on Jun 27, 2019

Kick stand up or down,clutch in or out? Tranny in neutral with neutral lamp on? Did it start after that one time or it hasn't since? Check switch contacts for both power and start,test start solenoid and ensure power down to starter
Check all ground points and clean em at block,frame and batt posts also. Coat all terminals with dielectric grease. Best corrosion protection.

Yamaha... | Answered on Jun 19, 2019

It sounds like the carb jetting is plugged up so that carbs should be removed and cleaned! When you first start the bike keep it idling by having someone hold it on and at the same time light touch the front and rear exhaust pipes. The carb that is working will have a hot pipe and the one not working will be cooler or cold.

Yamaha... | Answered on Jun 17, 2019

need to replaces your starter coil which seems when it heats up crates short.

Yamaha... | Answered on Jun 17, 2019

First off, I put a brick under the kickstand to get my bike near level...then i gathered the tools needed. 5mm Alan Head (Hex) Bit, 8mm wrench, phillips head screwdriver, and a vacuum pump (not necessary but very helpful if you're doing it solo.

Attachment 51703

Next step is to remove the left rear cylinder side cover. three 5mm bolts hold this in place.

Unscrew and remove the resevoir cap and diaphram carefully. Cover your paint with a towel (I was probably a little overdue for a fluid bleed...)
Suck out the old fluid from the resevoir using the pump (or a turkey baster) and refill with new DOT 4 brake Fluid (or DOT 3 or DOT 5.1)
Attach a plastic tube to the clutch bleeder valve, set up your vacuum pump, and loosen the valve using an 8mm wrench.
Now, get to pumping...watching the level in the resevoir as to not let it suck any air. When the fluid coming out of the valve is clear, the system is flushed.
(NOTE: if you are doing this by hand, (1) loosen the bleeder valve, (2) squeeze and hold the clutch lever, (3) tighten the valve, (4) release the lever...then repeat 1 through 4 about 50 more times being sure to watch the fluid level in the resevoir)
Once you are done, close the valve to 4.3 ft/lbs and refill the resevoir. Then replace the diaphram and resevoir cap.
Put the rubber cover on the bleeder valve and re-install the left rear cylinder cover. Check the fluid is at the appropriate level...

Yamaha... | Answered on Jun 16, 2019

yes be sure you mark everything. each gear to chain to engine.

before you remove tensioner wire chain so they stay tight on the sprockets when you remove the tensioner


Yamaha... | Answered on Jun 13, 2019

Its a carb issue but more than likely the internal passages are gummed up. Its probably because you have been using ethanol blended gas. The alcohol wreaks havoc with small engine carbs they were never designed to run this type of fuel. You can try to rebuild it but I have found it only works about 10% of the time. Save yourself a bunch of headaches and purchase a new one. Try to buy non-ethanol fuel or at add a fuel system cleaner everytime to fill up. The cleaner will extend the life but ultimately the new one will plug up.

Yamaha... | Answered on Jun 05, 2019

Easy and cheap way to increase your speed without messing with the motor,gas,air or spark is to change the sprockets and chain set up on your final drive. Go to gearingcommander.com for all the specs and information on how it will effect your engine and what is best for your year model bike. Ride safe and ride free

Yamaha... | Answered on May 27, 2019

Possibly restricted exhaust or valve worn or piston rings worn take out spark plug hold gently but firmly against the plug hole turn over engine Holding the plug obviously not with spark plug cover on !! It should at least push the spark plug away from the hole with a pop pop pop sound if so hopefully that rules out valves if it's not burning oil then it probably not rings could be timing off or valve seals most engine with leak will run full revs under no load ps also check plug gap :-)

Yamaha... | Answered on May 27, 2019

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