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No spark on yamaha 3.5 hp 2 stroke - Boating

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Grounded stator trigger coils power pack kill switch . netural switch //////////?????///// outboard man only thing sorry

Posted on Mar 18, 2011

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Hard starting on Yamaha 130 2 stroke. Always starts easily with ether. Choke works well.


This can have some reasons:
1 clogged carburettors. Too less fuel means a hard start.
2 Worn spark plugs
3 Loss of compression... On a 2-stroke, measuring compression is not an exact science. Have throttle wide open. No spark plugs, check compression on all cylinders. They should be all within 1bar from eachother...

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Hi, Sal 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 $0 you can download another one. 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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if its got a 10 after the letters and numbers on the plug then its 1mil !

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clean and balance carbs , compressions all above 100psi ? sparks on all cyls ?

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My 1974 dt 250 yamaha enduro has a whole in the piston


Hi, Tim you have what is called "PRE-IGNITION" and the usual suspects are:
1. Spark plug heat range too high.
2. Spark plug loose in the cylinder head.
3. Broken spark plug porcelain with carbon buildup.
4. Foreign particle embedded in the combustion chamber.
5. Excessive carbon deposits on the piston head or in the combustion chamber.
6. Points ignition timing too far advanced due to improper timing plate position.
7. Faulty electronic ignition sensor inputs from the MAP, CKP, CMP to ICM/ECM.
8. Engine overheating due to lack of lubrication or coolant.
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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http://mybikemanuals.com/yamaha/yamaha-dt

Btw, I’m available to help over the phone in case u need at https://www.6ya.com/expert/gregg_c0ec1df182c7330e

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Yamaha 4HP outboard - cannot pull starter cord - jammed.


Engine or gearcase seized...
Remove the recoil starter ( 3 bolts and the startingear link)
If you can turn the flywheel slightly: Gearcase seized
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In both cases: If you can't disassemble and have the job done yourself, forget that motor...

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4 stroke Yamaha 50HP -Runs rough at all throttle levels


If it has the old points system you will need to set the points also adjust the carburatior screw the screws all the way in and back out 2 1/2 turns then get it to run turn the air mixture screws till it runs smooth. you want it slightly lean then enrichen it slightly, afterword shut the engine down and look at the plugs if they are gray black they are ok. good luck.

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Firing order for yamaha xj650 1981 motor cycle


without a manual can you set-up the timing mark on flywheel
an see what cyl is compression stroke to find #1 cly

coil 1 are spark wires 1 and 4 cyl

coil 2 are spark wires 2 and 3 cyl

now if still have trouble then (if same plug connection) switch the around inlet plug on coils form bike wire harness or swap spark wires

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