Question about 1992 Yamaha TZR 250 R

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My tzr 250 is backfiring. after backfiring the engine will cut off. and i can hardly start the engine.

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  • Yamaha Master
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A back fire like that can mean an electrical problem.
have the coils checked
it could also be as simple as a short in the cut out switch, or a worn ignition switch

Posted on May 25, 2011

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1 Answer

Fix backfire at idle TZR 250


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.
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Will yz 250 engine fit a tzr 125 frame?


Hi, Anonymous after careful deliberation 4 out 5 Yamaha Gods give this one a thumbs down, but just to be on the safe side you should give your local dealer's parts/service department a call to confirm. For more information about your question and valuable "FREE" downloads that you will need please click on the links below. Good luck and have a nice day.
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How do i remove the front drive shaft bearing ( the one that suportsthe front sprocket ) from a tzr 250 3ma / have i got to split the engine caseing right in half / as iv removed the gear box iv tryed...


When the gearbox is removed after splitting the engine cases, the bearing will then pull off the shaft, there is a retainer on the bearing, hope you havent damaged the cases in your attemt to remove the bearing

Sep 18, 2011 | 1990 Yamaha TZR 250

1 Answer

I need a carb diagram for yamaha tzr 250 cc motor cycle year 1988 it will not rev with out choke on . blocked jets?


Hi, Rolandwhitfo and the usual suspects are:
1. Fuel cap or fuel tank is not venting properly.
2. Fuel filter clogged.
3. Fuel line pinched or kinked.
4. Vacuum line from the petcock to intake manifold cracked.
5. Float needle and seat sticking.
6. Float level too low.
7. Carburetor bowl vent line clogged/blocked/pinched.
8. Idle adjusting screw set too low.
9. Air/fuel mixture screw set too lean.
10. Idle port, transfer ports, slow air jet clogged.
11. Slow fuel jet clogged.
12. Faulty fuel pump.
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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Aug 08, 2011 | 1988 Yamaha TZR 250

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Yamaha TZR 250 float specs


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.
Good luck and have a wonderful day.

Dec 25, 2010 | 1987 Yamaha TZR 250

1 Answer

Iv just bought a tzr 125 belgarda its smokes like hell and will not rev up.. someone said it may be leaking gearbox oil into the piston some how?? i changed the plug.. and turned the power valve to open...


There are two places where gearbox oil can leak into the combustion process: from the gasket between the two engine case halves, or from the crank seal on the right hand end of the crankshaft. The most likely culprit is the crankshaft seal.

Nov 15, 2009 | 1987 Yamaha TZR 250

1 Answer

My yamaha tzr 250 runs for just a few minutes and the engine dies out.and when i try to start it...it will only run again after a few minutes of rest....


Check your fuel lines and filters. If these are dirty then maybe the fuel is restricted so when you rest the bike the carbs will refill.

Aug 26, 2009 | 1990 Yamaha TZR 250

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