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  1. Scott06

    Accurate Horsepower Figures

    You could try going up one hole for a slightly larger pump shot see if that makes any difference
  2. Scott06

    Not getting Spark on MCM170 Alpha 1

    Best to start your own post so we can get details of what's going on. your examples sounds like you aren’t getting 12 v to coil either bad ignition switch, man overboard switch is tripped , or shift interrupt is tripped . Disconnect shift interrupt at shift plate to test .
  3. Scott06

    350 Mag Mpi hard to start when warm or hot

    In the manual there will be ohm specs for coil primary and secondary sides easy to test
  4. Scott06

    3.0L MerCruiser, idle trouble.

    Would also mention checking fuel system for contamination. That carb is an aftermarket version of a mercarb so it’s second time the boat has had carb issues. Would verify fuel system contaminants are not gumming up the carb
  5. Scott06

    engine swap need to find right prop

    I think you are going to run out of available lower pitch props, so would look to get the 2.4:1 ratio drive, then play with props
  6. Scott06

    4.3 mercruiser vs vortec pistons

    Marine cam is best bet. auto head gaskets will corrode in raw water vs marine that are stainless or composite to stand up to raw water vs antifreeze.
  7. Scott06

    4.3 mercruiser vs vortec pistons

    A lot of bunk theories on marine vs automotive. Marine engines are basically a truck engine . Is the donor engine out of a car or truck. if car you will need to swap the cam . Truck cams are close enough to marine cams to work. Swap head gaskets for marine and freeze plugs for brass or...
  8. Scott06

    Bogging issue

    what line do you pull off? The fuel line ? of that is the case then you either have too much fuel pressure or a bad float or needle and seat
  9. Scott06

    Trim pump solenoid

    This has the two trim solenoids on it - https://www.marineengine.com/parts/mercruiser-sterndrive-parts/alpha-one-genii-1998-and-up/0l100040-up/hydraulic-pump-and-bracket looks like they are the same as starter solenoids
  10. Scott06

    2017 Stingray 198 LX

    Most likely the dash or switch pack is used for multiple boats - my sea ray has a switch for a windshield wiper, yet there is no wiper on the boat. I used it when adding LED lights....
  11. Scott06

    Accurate Horsepower Figures

    I didnt mean to rejet- both the 5.0 and 5.7 have the same jetting. this is the file I meant to attach with those specs. Not sure if the venturi is any different other than the holes for accelerator pump nozzles, which could be drilled out.
  12. Scott06

    What do I check next on overheating issue?

    this guy shows how to check for bravoitis I would think u can do it with out janking the engine if you are young and skinny (aka not me) Here is a thread on testing water flow from raw water pump - it think 7.5 qts in15 sec...
  13. Scott06

    Accurate Horsepower Figures

    If you have too much pitch that would be the case, but usually to get on plane relatively quickly I'm 2/3-3/4 open throttle, then pull back once on plane. Your WOT RPM will be key- if you are on the low side of your range say 4400 rpm go down to a 19" pitch. The carb was set up for a 5.0 - the...
  14. Scott06

    Mercruiser 4.3 will not start

    This is the symptoms of the man over board switch being tripped. Red toggle on shifter cycle it
  15. Scott06

    Quadrajet Secondaries Problem

    This is the detail on the new qjet on national carbs website. Its is an aftermarket carb. So yes it is new but it is not a NOS rochester made carb, if ot was it would be 2-3 the price
  16. Scott06

    Inboard 2011 4.3 Merc

    Merc power tune, makes rubber slide on things
  17. Scott06

    carburetor suspect problems

    I have had ones that run decent but are hard to start. Seen it on a couple where I didn't realize spark wasn't perfect, replaced some parts and noticed a big improvement in how quickly they started. Seen this on an old 2 stroke Evinrude 15, my 65 GTO, and most recently when I repowered my boat...
  18. Scott06

    engine swap need to find right prop

    Agreed you need a different ratio drive. You can swap just the upper to a 1.98 /2.00 that the 3.0 used, Merc also makes a 2.40 drive but I think you need the whole drive as lower gears are different too. Would think if you went from the 1.47 drive that was likely in there to a 1.98 you would...
  19. Scott06

    carburetor suspect problems

    A working choke will help but the phrase below implies that spark may be weak but your call I cant confirm what kits fits your carb best to contact sellers and give them your carb number or discuss with them
  20. Scott06

    2007 Volvo Penta 4.3 - engine swap

    What casting is your block ? @Scott Danforth did a write up of the various generations of 4.3 blocks Michigan motorz lists a split in their reman 4.3's -96-2007 (casting 090 and 090M (metric) ) and 2008 -2015 (casting #234)...
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