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Yamaha xs850 backfire - Yamaha Motorcycles

Posted by Anonymous on

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Hi, Anonymous and the usual suspects are:
1. Severely discharged or a damaged battery, should have 12.5 volts or better and be able to pass a load test if necessary.
2. 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.
3. Faulty main circuit breaker and or connections.
4. Faulty ignition coil and or connections.
5. Faulty spark plug, oil or gas fouled, wrong heat range or service type, wrong gap, loose in the cylinder head, broken electrode or insulator.
6. Faulty spark plug cables, leaking or broken, internal damage check for spark leakage in the dark.
7. Faulty ignition module, switch, CKP, MAP, CMP, sensor and or any connector in the ignition circuit could have corroded, loose, or broken pins/sockets
8. Burnt exhaust valve or air leak in the exhaust system.
For more information about your issue and valuable "FREE" downloads that you will need please click on the links below. Good luck and have a nice day.
Viewing thread Problems With Running Backfire
1980 yamaha 850 backfiring Motorcycle Forum
http://biobug.org/motorcycle/xs850/Yamaha-XS70-XS850-Service-Manual.pdf
OEM parts for Yamaha
Yamaha XS850G Owner Manual

Posted on Dec 16, 2016

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6ya6ya
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Posted on Jan 02, 2017

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