20 Most Recent 1979 Yamaha XS 500 - Page 6 Questions & Answers

I always add about 10% oil to my small engines to help protect them from friction. If it starts ok with that much oil, it might smoke a bit and cause a little carbon build up on the plugs or valves, but most engines after 1980 are high enough heat and compression ratio to clean themselves up.
Sometimes the oil doesn't blend in all the way without some sloshing around.

Yamaha... | Answered on Mar 14, 2020

The gear cogs might have moved or damaged. Better get a repairman to have a look at it.

Yamaha... | Answered on Mar 14, 2020

Did you check/clean your air filter? I had a no start issue with my Yamaha RD350 where the filter box was tight up against the seat and no air was getting into the carb. Do you have compression? Is the cylinder still attached by the connecting rod? Have you recently made any changes (like new jets) or repairs to cylinder or rings?
usually it comes down to an air intake issue if you have a working cylinder in a motor with gas and spark unless your timing is so far off that it isn't firing during the compression. But it might still backfire if it's off?

Yamaha... | Answered on Mar 14, 2020

Sorry but I need more details. I can not see what you see. Please write back and tell me what you did (Step by step) to prepare the caliper for new pads. I think it would be worth double checking your work and the caliper for operation. The rear caliper is a two in one. By pressing down on the rear brake pedal. Do the rear brakes engage? When you serviced the rear brake pads. Did you remove the parking brake linkage? Actuate the parking brake lever. Do you see the parking brake linkage move? Depending on what you find. You may have to adjust the threaded rod at the caliper or you may find that something is wrong with the caliper.

Yamaha... | Answered on Mar 14, 2020

Is ur batt reading at 12.6v..it must. Or u hava bad sensor etc in the harness..maybe a bad ground or loose battery connects. Buy a clymer manual or git bike scand w a factorytool to read values showing whats happend in the circuit

Yamaha... | Answered on Mar 13, 2020

Bike is 20yr..oil latch w wwd40 or take it apart..chec used parts online

Yamaha... | Answered on Mar 13, 2020


Yamaha... | Answered on Mar 10, 2020

check the float level . what you describe suggests that the fuel level is not high enough to service the idle circuit .make sure that you have adjusted the idle screw as well

Yamaha... | Answered on Mar 09, 2020

Not finding what you are looking for?
1979 Yamaha XS 500 Logo

Popular Tags

19 questions posted

Ask a Question

Usually answered in minutes!

Popular Products

Top Yamaha Experts


Level 3 Expert

3063 Answers


Level 3 Expert

501 Answers

Cindy Wells

Level 3 Expert

6220 Answers

Are you a Yamaha Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

View Most Popular

XS 500 Yamaha

  • XS 500 Yamaha

Most Popular Question

electrical trouble

  • Motorcycles