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  1. Jet Boats
    Exhaust Popping between 3800 & 4200 RPM's **UPDATE!** **UPDATE!** See#10 Howdy All! I am hopping you can help me diagnose this. My brothers boat seems to be popping out the exhaust between 3800 and 4200 RPM's or so. You put the pedal to the floor and it will push past the popping to...
  2. Jet Boats
    Which is more important in a jet boat? Once I get the dual quad set up on this one I am going to look into starting a stroker for the Tahiti. I have noticed that the bigger the cubic inches on the stroker, the more they refer to the power being low-end and not up in the RPM range. I'm not sure...
  3. Outdrives
    My port engine is strong until about 3800 rpm, starboard is fine. Happened last 2 times out, had the Sunny 3 years now & never an issue with this engine. I put the rinda scanner on it & no abnormal fault codes, said 100% power avail from ecm. Did the induced misfire test on all 8 cylinders 3...
  4. GN7 On the Dyno
    I have a Mercury 6.2L that I am having some challenges with lately. I have replaced the ignition assembly, plugs, fuel filter wires and IAC on it. It runs really well when it is cold and even for a long while when warm. But after a good hour of running, it will start to drop RPMs. While cruising...
  5. Jet Boats
    Ok here is what I have. 76 21' Omega Open Bow Day Cruiser. I have a jacuzzi wj with B impeller ( equivalent to berkley A from what I understand) It have a Ford 460 .030 over KB 22cc dish cast pistons, Ported D3 heads stock rockers and lifters ( Installing ported D0VE friday with 1.73 comp roller...
  6. GN7 On the Dyno
    Does anybody Know the rev limit of a 7.4L MPI? After driving the boat all last weekend the most i saw was about 4,600rpm. Is this normal or can i get more?
  7. GN7 On the Dyno
    Hey all... I'm new here...and after being out of the boating scene for the last 20 years...I've purchased a 1990 Mach 1 Endeavor 2900 -- it has a 454 Magnum, 365hp, carburetor engine. The seller had the engine rebuilt about 7 years ago, added a performance edlebrock carb, and the lower unit...
  8. V-Drives
    ...For the past eight years,...since I switched from the from the factory generator to a Delco alternator set up on my '63 Hallett,... the alternator will not begin to charge until I crack the throttle and give it some RPM???... ...If I do this once it will generally charge for the rest of the...
  9. V-Drives
    ...For the past eight years,...since I switched from the from the factory generator to a Delco alternator set up on my '63 Hallett,... the alternator will not begin to charge until I crack the throttle and give it some RPM???... ...If I do this once it will generally charge for the rest of the...
  10. GN7 On the Dyno
    Max rpms 4000. No beeping or anything. Hooked to computer and no codes. Changed spark plugs and new fuel. Same thing. Help?!
  11. Jet Boats
    when running on flat water i can only get up to about 4400rpm. my motor(bbf) is not cutting out or anything, could this be because of my impeller? i dont know what cut or blade it is but its in a yj jacuzzi. any ideas. thanks
  12. Jet Boats
    First time I took the boat out, it turned 5000rpms. Didn't have my gps so not sure what the mph was. Sunday I took it out..same setup with a 2* wedge and bowl transition adapter "rooster booster" and it only turned 4750-4800. Although it was about 30* warmer this time around. Does that sound...
  13. Outboards
    this weekend one of my 300mercs starting dropping rpms from about the 4k rpm range and would not let me go over that. it acted like it was starving for fuel and started bouncing different rpms all over the place, it would go from 4k to 1500k rapidly. anyone know what to check first?? sound...
  14. Jet Boats
    Thats what I ran saturday in parker. Does that sound about right? Fresh pump, 2* back cut shoe, rideplate, and diverter. Im thinking maybe the shoe could go down some. Should I be turning more rpms?
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