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  1. J

    How do I test stator coils on a 9.8 2 cylinder?

    9.8 A901055 running on one cylinder only. Am I naming the parts right? The ignition coils under the flywheel. Would like to get to know these coils better. Can I do a resistance measurement on them? Thanks J
  2. J

    Water in engine oil. 150 mercury Varado.

    I feel your pain. And I feel for you with 21 reviews and no responses. Can you provide serial number? I don't know the engine but you have to consider the gaskets that separate the water path from the oil path. What's a compression test say? J
  3. J

    1986 90 HP Mercury in-line 6 cylinder overheating?

    Christmas gift idea: infrared thermometer. J
  4. J

    92 40 HP Mariner 4Cyl Won’t Idle

    Please provide serial number. I'm not familiar with engine specifically and there are several 40s to choose from in my source list. I want to be sure I'm looking at the right configuration. Thanks. At first pass it does indeed sound like a low speed fuel starvation issue, but you're on the...
  5. J

    Why is fuel leaking from my vapor separator?

    Thanks alldodge for the reply. I found removal is pretty straight forward. I got the unit off last night and opened it up. Looks good inside, nothing dirty, broken, out of place. I removed the needle and float and cleaned them and the needle seat. I put the unit back together and started it...
  6. J

    Why is fuel leaking from my vapor separator?

    2006 60ELPTEFI 1B294476 Filled my fuel tank and my vapor separator started leaking out the top vent. Any correlation? Thanks, J
  7. J

    1988 Mercury 25 xd Timing and sync problems

    I see. It will try to start but not stay running. So ignition is firing. Not sure of your set-up. Is the engine still on the boat or in a barrel? Are you working the controls from the helm or back at the engine? Work them back at the engine. Do try the premix squirt, the squeeze ball and...
  8. J

    1988 Mercury 25 xd Timing and sync problems

    With those ignition components being new, you probably don't need the timing light although it would be a good add to your arsenal. Verify that your new spark plugs are delivering and then try to inject some premix. This is a stretch, I know, but, ... "Ran for a short time . When you go to...
  9. J

    1988 Mercury 25 xd Timing and sync problems

    Not entirely clear on your symptoms. Why did you replace "all the electrical"? Were those ignition parts or wiring harnesses, rectifiers or starter solenoids? During carb rebuild, did you clean the low speed jets? When you say it doesn't "turn over" are you saying you cannot spin the crank...
  10. J

    Is this a reasonable trigger test?

    Got a 9.8, A901055, misfiring. Top cylinder firing out of time. Really running on lower cylinder only. I put my meter on the trigger and rotated the flywheel past it by hand. Signals are created that correspond to the TDCs of the cylinders. I find no extraneous signals around the flywheel...
  11. J

    9.8 Running on One Cylinder Only

    Ahhh. You're making me think. There's plenty of forum input for non-existent spark but the population isn't coming through with how to deal with a malfunctioning spark. Nothing meaty on this or my previous post. What is your experience telling you? Where am I going wrong? This can't be the...
  12. J

    9.8 Running on One Cylinder Only

    The bottom cylinder parameters, the basics, must be "close enough" because it is running. Bottom ignition fires "close enough" to bottom TDC. Verified with timing light attached to the bottom spark plug wire. Switched the timing light to the top cylinder spark plug wire and its timing mark...
  13. J

    9.8 Running on One Cylinder Only

    racerone, nailed it! Thank you for sticking with me! Found the factory timing marks on the flywheel and a reading window on the recoil starter cover. Verified flywheel timing marks corresponded to TDCs. Repainted marks for a good read. Started the engine. Lower cylinder timing mark reads...
  14. J

    9.8 Running on One Cylinder Only

    9.8, 2 stroke. Serial A901055. Top cylinder not contributing. Compression at 125 psi, spark plug does fire and spark energy will jump 3/8" air gap. With the engine running I can pull the spark plug lead from the top cylinder and the engine performance does not change in the slightest. If I...
  15. J

    Badged as 9.8, Serial A901055 Running on One Cylinder Only

    racerone, thank you for sticking around. This story is so long. I'm short on the diagnostics. Timing, stator signal, trigger and crankcase pressure measurement techniques I'm not familiar with. I'll have to look for videos on how to. 1 Spark at the right time One of the big clues I have is...
  16. J

    Badged as 9.8, Serial A901055 Running on One Cylinder Only

    Intake cover. Yes. Seals the intake paths between the sump and cylinders. Looks like access was for machining the casting. Could leak vacuum, yes? Gasket was squeezed right out of position, bulging like a figure 8 instead of parallel sides. Reseated with much better surface area contact. Had...
  17. J

    Badged as 9.8, Serial A901055 Running on One Cylinder Only

    Without anything else to try, I'm going by the words used in the parts list. I see things called an intake cover and intake cover gasket. If this is leaking could it spoil the intake vacuum for the top cylinder? J
  18. J

    Badged as 9.8, Serial A901055 Running on One Cylinder Only

    Any other components within the crankcase that could leak resulting in vacuum loss at top reeds? Should I replace the o-ring on the top bearing housing just because it's cheap and easy? Get it off the list? J
  19. J

    1973 Mercury 40 4hp: Compression, Spark, Fuel - No Start

    Condenser: Unfortunately, a competitive website. marineengine.com I see aftermarket cdi, part number 994-4463 (takes the place of Mercury 336-4463), $55 before shipping. Must be one helluva condenser @ $55. J
  20. J

    RPM won't go over 4000

    May not be running on all cylinders ... ? Is it worth trying to pull each spark plug lead while running and see if performance changes? If you pull a wire while running and operation changes, then that cylinder is working. If you pull a wire and nothing happens, then that cylinder is dead...
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