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  1. Texasmark

    76 Mercury 850 runs good on muffs but wont accelerat much past idle in water

    Engine will run on SF, big guns on here years ago attested to that. Idea in hitting the venturis with something combustible is that if the engine needs something combustible to put out the HP then SF will provide it and you will know you are lacking adequate fuel.....so you chase a fuel...
  2. Texasmark

    76 Mercury 850 runs good on muffs but wont accelerat much past idle in water

    Get yourself an aerosol can of Sea Foam...at any auto parts store. Get a helper to run the helm. Remove the engine cowl and try the hole shot (pedal to the metal) without spraying into the carbs. Get a data point. Spray a squirt into each carb and immediately hit it again. If it roars at...
  3. Texasmark

    Water pump tube seal

    Faztbullet would know...ping him.
  4. Texasmark

    Help with motor height adjustment

    Replace your trim relays. The Up/Down SP OFF DT spring loaded switch is controlling "signal" power (low wattage) to operate the solenoids in the relays. The relay/solenoid contacts do the work. If you were around in the days of ignition systems with points and condenser (capacitor) and...
  5. Texasmark

    Other causes for prop slip?

    They would have to be pretty bad and be in the "new water" area that precedes the prop.....but yeah it could, just like on boats like aluminum whose hull is stamped in two pieces with a "keel" along the bottoms center line to cover up the joint and are an aid in reinforcing it....they cause...
  6. Texasmark

    Other causes for prop slip?

    Your speed was measured how? Instrument, GPS? How do you know the tach reads accurate at idle? A 5% error on the instrument or your guessing it's correct at 650 idle RPM, if on the low side would reduce your apparent slip to 17%. A 10% would drop that to 13%. 13% could be expected out of an...
  7. Texasmark

    Outboard stalls when put into forward after reverse first

    The idle number you posted is Merc's idea of a number that will keep the engine running when going from N to F but not be so fast such that you get a "klunk" when you do it. You already told us that the engine is running as it should so rule poor engine tune/performance out. You are putting...
  8. Texasmark

    A little give on the shaft?

    Some Mercury engines have a built in "overrun clutch" built into the rear of F gear and the front of the "clutch dog" that rides on the Prop Shaft and is positioned along the prop shaft by the shift linkage, selecting FNor R gear. On these some Mercury engines, there is a sawtoothed...
  9. Texasmark

    Help with motor height adjustment

    I didn't include it here as I didn't look closely at your pictures but I like what I see. You have enough water over the AV plate to do what you want with that setup, for top end. rough water running, and pullinng water toys. At that height you have enough water over the prop to run about any...
  10. Texasmark

    Help with motor height adjustment

    If you want to spend some money on a prop, get the same number of blade as you currently running, SS with variable pitched, cupped blade tips and most importantly, high "rake". Expect it to load the engine more than your TP Hustler even though it has a lot of what I mention below.and you might...
  11. Texasmark

    Best prop

    "Side View" of the boat standing at the transom looking at the boat, maybe 8' away, getting the camera 2-3' off the ground, engine in the run position. This will show the hull, the engine position with respect to it, the height of the engine and tilt angle. Is the bottom of the boat flat or is...
  12. Texasmark

    2003 75hp 75ELPTO fast idle when warm

    Idle is set by engine timing on that engine, just like my 2002 90 and 115, at 675 +/-. Timing is right around ATDC (At Top Dead Center) when idling and as you increase the throttle, the timing advances to about 22* BTDC (Berfore Top Dead Center) at WOT (Wide Open Throttle). Coming back down...
  13. Texasmark

    rec gas and mercruiser

    I ran regular gasoline in my Mercruiser when I had one. If I had one today and did the family out on Sunday afternoon thing with water toys and all and used the boat frequently E10 wouldn't bother me a bit and probably no additives other than a little injector cleaner now and then like I do in...
  14. Texasmark

    rec gas and mercruiser

    Can of worms but I find gasoline filling stations around marinas and launch sites here in N. Texas.....HMMMM. Also today I stumbled across a New Sea Foam "Marine" grade fuel treatment. Lots of good things in the can application area. Bought some. I run gasoline in my current 2 stroker OB...
  15. Texasmark

    Primer bulb to transfer gas into another tank.

    The fuel pump in the motor "sucks on it" while the engine is running after your squeezing hand pressure filled up the line with gas.
  16. Texasmark

    What's the difference 1000ss -v- 1000

    Shucks I thought it was for Super Sport, like the Chevrolet Chevelle 396 SS back in the 60's, in regal blue, 2 door hard top.....I lusted in my heart for one of those.......
  17. Texasmark

    Help with motor height adjustment

    We haven't heard from the thread originator "Monkeybird747" since somebody took the liberty to move this thread from where it was. You don't suppose he couldn't find it to tell us how his latest and hopefully final test ran???????
  18. Texasmark

    Looking for a prop

    Mercury's shaft is 15 spline and the 75 thru 125 4 cylinder OB 2 strokers run 13-14 inch range with pitches up to 24" (Ballistic 13+x24) which I was running when I took this picture in my avatar.
  19. Texasmark

    Prop Recommendation

    Good info from Scott. On the loaner thing, cheapest way to get it right even though you pay more for the exact prop you can find off the shelf elsewhere....obviously.....butttttt look at the big picture...you saved yourself buying 3 or 4 and not necessarily getting what you want. Remember the...
  20. Texasmark

    Changing to stainless steel prop

    You can't jump off the aluminum wagon and onto the SS wagon...not that simple. OEM aluminum general purpose props vs SS which are usually high performance props, and that could be high performance in tasks other than top speed. are like night and day.
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