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Recent content by Miles2000

  1. Miles2000

    No spark through distributor

    Pull the cap first. Look for carbon tracking and a wet rotor... those 454s corrode under there in a damp bilge. But before you buy anything, check the kill circuit. The shift interrupt switch on the Cobra bracket grounds the ignition to unload the dog clutch. If it sticks closed you get no...
  2. Miles2000

    trim gauge

    Depends what is already on the motor. Does it have a trim sender down on the swivel bracket with a pigtail coming off it, or is there nothing there and the trim position only shows on a SmartCraft gauge? If the sender is there you do not need a converter. It is just a variable resistor...
  3. Miles2000

    Spark plug gap incorrect from factory?

    I'd be surprised if the gap is what's making them black... A tight gap does not add fuel. On an EFI motor the ECM sets the injector pulse width off the MAP sensor and the temp sensor. The plug gap is downstream of all that. If anything a tighter gap fires easier, it takes less voltage to jump...
  4. Miles2000

    7.5 S# 30221572 - need advice on changing the upper lower block gaskets

    racerone knows these a lot better than I do, listen to him first... But those two things you mentioned might be one problem, not two. On a two stroke the crankcase is the intake side. Any air that gets in past a seal or a joint leans the whole motor out, and leaning out is exactly what falling...
  5. Miles2000

    lower unit compatibility

    SWAG but I'd say yes, it'll bolt up. Both of those are the 60 degree V4, same block family. The aftermarket guys sell one gearcase for 75/90/100/115 covering 95 through 2006 and Ficht is right there in the fitment, so the flange and the bolt pattern are the same... Bolting up isn't the whole...
  6. Miles2000

    Bravo 3 OEM Mercury prop issue - appreciate input

    Pictures would help, but going by what you describe I'd lean toward the casting and not an impact. Two different props with the same flaw in the same place, both times lined up with one of the ribs into the barrel... that's the thick part of the casting, and the thick sections are what freeze...
  7. Miles2000

    1998 mercury 200 efi, my motor will trim up but not down

    Relay swap is the easy first one, agreed. One thing worth knowing on these though. On the permanent magnet trim relay setup the two heavy motor leads get switched to either positive or ground to make the pump run either direction. So down needs two things working, the down relay putting 12 volts...
  8. Miles2000

    1959 Evinrude Impeller

    That dark greasy junk is pretty normal on a motor that sat. Most of it is exhaust residue. Burnt oil works its way down the exhaust housing and collects right around the pump... they mixed the fuel a lot richer back then, so there is plenty of it to go around. Way I tell them apart is the...
  9. Miles2000

    Honda 150 hp BAPJ crank/no crank

    Two questions first. When it will not crank hot, is the starter dead silent, or do you get a clunk from the solenoid? And have you tried turning it over by hand with a socket on the crank bolt right after it quits hot? Here is why I ask. Silent means the control side never told the solenoid to...
  10. Miles2000

    2016 Suzuki DF140 overheating issue

    <p>Short answer to your three... yes, yes, and yes there is still one thing you have not done.</p><p><br></p><p>First off, stop starting it. Every one of those hot restarts with no water moving is another heat cycle you do not need. The alarm shutting it down is the ECU doing its job, but it...
  11. Miles2000

    2004 Mercury 90hp engine starts, stalls with in seconds.

    Before you change any more parts, run it off a portable tank. Hook a 6 gallon portable straight to the engine, bypassing the boat's line, primer bulb, separator and antisiphon valve. If it stays running, the problem is on the boat side, and the tank vent is the first suspect. A partially blocked...
  12. Miles2000

    1988 DT 85 Oil Leaking from Underneath Powerhead

    Your lower crank seal is very likely it, and the running symptoms line up. On a two stroke the crankcase is the primary compression chamber, so a leaking lower seal pushes oil out and pulls air in on the upstroke. That extra air leans the mixture, and lean is what makes one sputter and die the...
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