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1982 YAMAHA XV 750 WILL NOT START

I JUST BOUGHT A YAMAHA XV 750 1982,THE PROBLEM IS EVERY TIME I START IT TOOK 4 TO 5 TIMES BEFORE THE ENGINE WILL START AND SOMETIMES IT WEAKEN THE BATTERY.I ALREADY CLEAN THE CARBURATOR

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  • Yamaha Master
  • 40,748 Answers

Hi, Jhongs and the usual suspects are:
1. Fuel tank empty.
2. The fuel tank has old dead gas.
3. Fuel tank bottom contaminated with ethanol sludge, dirt, water, rust, etc.
4. Fuel supply valve/petcock turned off.
5. Fouled spark plugs.
6. Engine flooded as a result of overuse of the enrichner.
7. Vacuum hose to the fuel supply valve/petcock disconnected, broken, cracked, or pinched.
8. Fuel valve/petcock or filter clogged.
9. Fuel line to carburetor or throttle body pinched, kinked or blocked.
10. Carburetor float stuck.
11. Fuel injectors clogged.
12. Fuel injectors stuck open.
13. Severely discharged or a damaged battery should have 12.5 volts or more and be able to pass a proper "LOAD" test if necessary, you may have a cursory reading of 12.5 volts or more but little or zero amperage the battery is faulty and must be replaced, AGM batteries fail in this scenario more so than lead acid batteries.
14. 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.
15. Loose or corroded wire connection at the coil or plug between ignition sensor and ECM module.
16. Spark plug cables in bad condition and shorting check for spark leakage in the dark, cable connections loose, or connected to the wrong cylinders.
17. Ignition timing incorrect due to a faulty ignition coil, ignition module or MAP, CMP, CKP, O2, TPS, ETP, IAC sensors.
18. Faulty neutral, clutch lever, or kickstand safety switch.
19. Faulty fuel pump or fuse or relay.
20. A stuck bent or burnt valve.
21. Tilt sensor needs a reset.
22. Security system not disarming alarm needs a reset.
23. Check for engine trouble codes.
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.
Motorcycle Message Board Motorcycle USA
What to do When Your Motorcycle Won Start
http://service.tanga-moteurs.ro/data/yamaha_virago_535_700_1100.pdf
OEM parts for Yamaha
http://mybikemanuals.com/yamaha/yamaha-xv-owners-manuals

Posted on May 19, 2017

6 Suggested Answers

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

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Posted on Jan 02, 2017

robotek
  • 1512 Answers

SOURCE: My MT-03 engine shuts down while driving and won't start again.

Checking the colour of the plug may tell you what the general state of tune if like for the bike, but the sudden stops sure sounds like ignition system failing. Fuel delivery still there, although it may well be flooding/overfueling for some reason when the problem occurs.  I suppose you have checked the VIN (RM021000000000301 to RM021000000008715)  just to be sure that your bike if not one of those affected by the recall. I would be asking the Yamagents to check for the mods/recall to be sure that whatever the solution is has actually been done to yours. The reference to wet weather would be inclining me to follow that up to the max. Sounds too close to the problem to not be it. 

Posted on Jan 08, 2009

DickCanFixIt
  • 948 Answers

SOURCE: Yamaha XV 1600 Will not start. Starter motor works

The sprag clutch that kicks the starter gear into the flywheel is not engaging. This may involve splitting the engine/transmission case if you have to clean or replace that mechanism. I have had success running CD-2 as described here. You might try that before tearing into the bike.

Posted on Mar 19, 2009

  • 89 Answers

SOURCE: Won't Start

do you have compression? for a engine to run you need clean air,compression, good fuel(make sure the fuel has not been there 3 months or more as it will deteriate) and good spark as well as good exhaust as this will cause a back fire if the exhaust valves are not set right.

Posted on Apr 21, 2009

bozcro
  • 867 Answers

SOURCE: need detailed diagram for all fuel, vacuum and emission hoses

for a detailed manual, you would have to buy a yamaha shop manual for service mechanics. many ppl buy these, as dealership mechanics need this for complete repairs.

Posted on Jul 21, 2009

  • 2418 Answers

SOURCE: i'm looking for a diagram of carburator for 1982

http://www.babbittsonline.com

Posted on Sep 29, 2009

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