Question about 1990 Yamaha TZR 250

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Fix backfire at idle TZR 250

Backfire at idle

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.
http://www.rcramer.com/shop/backfire.html
http://faq.f650.com/FAQs/BackfiringFAQ.htm
Yamaha TZR250 1987 Service Manual
OEM parts for Yamaha
http://mybikemanuals.com/yamaha/yamaha-tz-owners-manuals

Posted on Dec 06, 2016

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Posted on Jan 02, 2017

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1 Answer

Tzr250 stalls


Hi, Robert and the usual suspects are:
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Hi, Rolandwhitfo and the usual suspects are:
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2. Fuel filter clogged.
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4. Vacuum line from the petcock to intake manifold cracked.
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1 Answer

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Hi, Quintinvbs for this scenario you will need your service/owners manual if you can't find the first and best tool you ever bought for your Yamaha, despair not, for a mere zero $0 you can download another one. For more information about your issue and valuable "Free" downloads that you will need please click on the blue links below. Good luck and have a wonderful day.
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Hi, Corsa_boi_15 the answer to this question is way above my pay grade for this situation, I would call or visit my local dealer or reputable shop's service/parts department and inquire about any possible quick fix, answers, or parts inquiry.
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Hi, Rynbrok the answer to this question is way above my pay grade for this situation, I would call or visit my local dealer or reputable shop's service/parts department and inquire about any possible quick fix, answers, or parts inquiry.
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