Hi, Anonymous and the usual suspects are:
1. Idle circuit and transfer ports clogged.
2. Air fuel mixture adjustment too lean.
3. Pilot jet clogged.
4. Faulty accelerator pump.
5. Float level too low.
6. Float bowl contaminated old fuel, water, dirt, rust, etc.
7. Float bowl vent or overflow tube clogged.
8. Fuel flow to carburetor restricted.
9. Intake manifold leak.
10. The gas cap is not venting properly or fuel tank venting system blocked.
11. Vacuum line from intake manifold to petcock broken, cracked, or not attached, carburetor vent line plugged.
12. Needle and seat stuck closed in the float bowl.
13. Multi carburetors not in sync.
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. TTR50 bogs and dies when twisting throttle https://yamahaclub.com/forums/topic/15251-idles-fine-but-dies-upon-throttle YAMAHA TT R50E Owner Service Manual OEM parts for Yamaha Yamaha TT R50E Owner Manual
Several ways to try. Be sure the air filter is clean and without any tears or punctures, install an in-line fuel filter, gap the spark plug at .030, be sure the stock spark plug is used ( NGK CR7HSA ), be sure the muffler not plugged up at all, increase the idle speed, and change the gearbox oil every 2 or 3 months. The only other thing would be to de-carbon the piston and head but that requires the head to be removed. Taking the head off isn't hard but you must be sure to have the valve cam timed properly when reassembled. If not installed properly, you can bend a valve the first time you try to kickstart. Please rate my answer.
Yamaha actually doesn't give specs for fuel air mixture. The manuals state that each bike is individually tuned at the factory, and if you clean the carb, you're supposed to screw it in, record the number of turns and put it back to that setting.I have one, and currently it's at 2 turns out, and for all little bikes, between 1 and 3 is where they should be at. If it won't idle, the pilot jet is wrong or dirty. Good luck!
1) Call a dealer and ask them.
If you cannot do that,
2) According to where you live in the world, decide the coldest temperature you ever have .
If it is about 30 degrees Fahrenheit or more, likely a 10W - 30 will serve you well.
However, if you have temperatures much colder than that, I should recommend a 5W - 30 or a 5W - 20 oil.
God bless your efforts.
Hi, Ray before testing any electrical component in the Starting Circuit it is "IMPERATIVE" that you have a fully charged battery of 12.5 volts or more and be able to pass a proper "LOAD" test if necessary, you may have a preliminary reading of 12.5 volts or more but little or zero amperage, the battery is faulty and must be replaced. AGM type batteries fall into this scenario more so than lead-acid batteries.
1. Ignition Switch not in the "ON" position.
2. Engine Run Switch in the "OFF" position.
3. Engine Run Switch is "FAULTY" or corroded.
4. Check the 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.
5. Bank angle sensor needs a reset or is faulty.
6. FOB battery low or dead.
7. Faulty ignition switch.
8. Faulty starter button.
9. Faulty kickstand, clutch, neutral safety switch.
10. Security alarm needs a reset.
11. Starter relay, solenoid, starter motor or circuit wiring faulty.
12. Starter armature or field coils have failed.
13. Main fuse or circuit breaker may be blown or faulty.
14. Faulty ignition relay.
15. The electric starter is working but starter clutch has failed.
16. Check for engine trouble codes.
For more information about your issue and valuable "FREE" downloads that you will need for viewing or printing please click on the blue links below. Good luck and have a wonderful day. 1981 Yamaha XJ550 MAXIM Starting Difficulties Troubleshooting Motorcycle Ignition 1982 Yamaha xj550 maximDOWNLOAD Yamaha XJ550 XJ 550 1981 81 Service Repair Workshop Manual... $15 https://www.partsfish.com/page/oem-parts-for-yamaha http://mybikemanuals.com/yamaha
Hi, Christine, 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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Have you made any adjustments to your chain lately ? is the tire pressure up to the right amount ? are any of your disk brake rotors getting hot even though you are not using them ? or drum brakes if your bike has them ? if the bike is on the centre stand or raised up of the ground can you spin the rear wheel and will move freely this also applies to the front wheel if it is also lifted off the ground can it spin freely ?doing this will answer your question