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  1. Scott06

    2012 3.0L TKS runs great with muffs, but slow on lake...

    the idle mix screws wont make any difference how it runs at higher rpm , just indicative that something was off if it ran best that many screws out.
  2. Scott06

    Carb tuning

    there have been a few threads - I think in this one two guys ended up wit the same tune on a vortec 4.3 ... https://forums.iboats.com/threads/stumbling-edelbrock-1409-4-3l-v6.670697/page-2 another one https://forums.iboats.com/threads/edelbrock-1409-2114-on-stock-4-3l-vortec-engine.600582/...
  3. Scott06

    2012 3.0L TKS runs great with muffs, but slow on lake...

    Correct no points or condenser in a delco est. If you are getting a good spark that jumps 1/4" gap or so then no the coil is not the issue Have you checked the tach vs a known shop tach? And you are getting a total advance of say 25-28 at 2500 rpm or so? If that is correct then I might go...
  4. Scott06

    Help with early 80s mercruiser 140hp

    Id start with a few basics use a spark gap tester to make sure your spark can jump a 1/4” gap or more. If the fuel pump was over flowing quite possible the plugs are fouled. Maybe turn the idle speed screw in / up a bit, fatten the idle mix up a hair. Leave the distributor loose so you can turn...
  5. Scott06

    Loud Rattle On Startup

    is the starter gear retracting or getting hung up? Any rocks or debris in the pump or trapped in the nozzle?
  6. Scott06

    End of Season oil changes?

    This- if there's any water in the drive or leaks you got all winter to fix it. If you do this the engine and drive will outlast the boat
  7. Scott06

    73 starcraft old merc to new merc

    I think minor cutting of the keyhole on the top corners is required. Nothing major or to worry about. Might be for the swing of the steering arm? thread below is about it https://forums.iboats.com/threads/mercruiser-engine-and-outdrive-replacement-keyhole-size.620343/ If you like and want to...
  8. Scott06

    Mercruiser Setting Timing on 3.0L

    you might be better off if the boat is on a trailer to take it to the machine shop and see if they have a machinist rule to look at the block.
  9. Scott06

    Freeze plug part number

    Have never seen the core plug for manifolds sold separately. you will likely have an easier time going to the auto parts store and getting a freeze plug based on OD. you can also use a rubber expansion plug if there is enough room between inside and outside of manifold. Did the manifold freeze...
  10. Scott06

    Mercruiser Setting Timing on 3.0L

    could be cant tell from the pics if the block surface is eroded or not. As mentioned below you need a long machinist flat bar to check the whole surface. You can put dykem or machinists dye on the block surface and sand with long sand block to see if the block is fire slotted- the dye will stay...
  11. Scott06

    1997 Mercruiser 4.3 LX not running steady steady at idle or higher RPM's

    get an ulntrasonic. well worth it. I did my buddies Holley 2 bbl off his VP a couple years back, Engine had all the symptoms of needing a carb rebuild, but when I opened the carb it looked clean, soaked all the parts in the ultra sonic using simple green as I was trying not to strip the paint...
  12. Scott06

    Mercruiser Setting Timing on 3.0L

    clean the head bolts and chase threads defintely ok to reuse. It may be the picture but look at the block closely where the gasket was blown between 2 & 3 - make sure the deck surface is not damaged as it can get fire slotted and cut so the new gasket wont take. Do you know if it overheated or...
  13. Scott06

    1997 Mercruiser 4.3 LX not running steady steady at idle or higher RPM's

    yes TB4 will not move at idle like a TB5 will. The accelerator pump ball wont affect idle quality, if you have a good pump shot and it doesnt bog when you stab the throttle leave it alone. If you adjust the idle mix screws does change the idle speed or quality? if not likely the passages...
  14. Scott06

    Mercruiser Setting Timing on 3.0L

    that looks like a GM manual as it says industrial marine - so yeah it probably is right- the merc manual has the carb info timing etc for how merc dressed it out per this link (may be worth what I paid for it..) you need manual #26 which is 98 and up 4 cyl gas alpha engines...
  15. Scott06

    1997 Mercruiser 4.3 LX not running steady steady at idle or higher RPM's

    have you set the timing on it and is the timing jumping around. Also disconnect the tach to see if it changes things. Bad tachs can mess with the spark
  16. Scott06

    Mercruiser Setting Timing on 3.0L

    get the factory service manual for your engine/serial number. The Mercruiser manuals are excellent resources for all details like this. I dont know off hand which manual you need, the only one I have for 4 cyl is #10 which covers 85-89 vintage engines. the guy in the video is twisting them to...
  17. Scott06

    6.2L MX MPI Stalls when shifting out of gear

    Yes what was described interrupts the triggering signal between the dist and the coil, will keep coil from firing
  18. Scott06

    6.2L MX MPI Stalls when shifting out of gear

    It’s the lower sketch and it goes under the rear motor mount . You can see the ear of the mount on the transom plate there. The flywheel cover mount sits on top of it
  19. Scott06

    6.2L MX MPI Stalls when shifting out of gear

    Yeah the biggest engine they make with an alpha is the 350 mag mpi- 300 hp. i Think all the 6.2 s are 325 or 340hp . prob closest way to get there is take. 350 mag alpha and reflash it for a 6.2 fuel curve I think the work around it using a NC interrupter to cut off the signal from dist to...
  20. Scott06

    6.2L MX MPI Stalls when shifting out of gear

    Could have resistance that’s why the test mentioned above it should move easily in and out of gear Smoothly
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