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From my experience the 2 piece drive shaft was on some of the 85Hp from 1989 and the 90Hp from 1990 and up. Pre 1989 the 85Hp had the 1 piece drive shaft and the water impeller and impeller housing is different between the 1 piece drive shaft and the 2 piece. Both gear case will fit a 85, 90...

I do not know about that. You have to check the schematic for your engine. Actually I never do anything to the inlet valve needle more than clean it with carb cleaner after I have had them in my Finsonic (same as Ultrasonic cleaner but another brand) cleaner. Then I blow the carbs with...

I have not worked with many engines with T&T but as you says it can be able to swap them. I think the hard thing is to loose the bolts and nuts holding the T&T to the swivel bracket. If it is a salt water engine it can be a real PIA.

The keyswitch has connection between the B terminal and the I terminal in ON and START position. Connect the lanyard in series with the blue wire from the keyswitch. The engine will kill if you turn the key to OFF or if you pull the lanyard. The 12V power from the battery will be broken (off)...

Yes as brodmann says if your engine has the Motorola Magna Power I ignition system. It is a battery powered distributor ignition system. First you have to check if your engine has a distributor, if not it can have the Prestolite system, the Magna power II system or has been converted to auto...

The Force power Ohms reading is mentioned in Outboardignitiondotcom and CDI Electronics troubleshooting charts. OEM Ohms reading for the stator windings 680-900 Ohm. CDI Ohms reading for the stator windings 250-350 Ohm. Have in mind when you check the resistance (Ohm) with a VOM or multimeter...

The Force power maybe I misunderstand you but the stator windings should read infinity to ground. They should have no connection to ground. Brown/black/yellow (or yellow) and brown/black/blue(or (blue) feeding pack for #3 and #4 cylinder 680-900 Ohms, infinity to ground. The same for the other...

In my opinion that synthetic oil will be good enough. Discussions about which LU oil or two stroke oil is best for your outboard can be a never ending story at internet forums. Use the gear oil that fits your walet. I use gear oils 75W90 or 80w90 that are for automotive gears. The only different...

As I said before check for spark as soon as possible when it fail. If you can reuse the plugs there are no rich mixture issue. I think the coils are the culprit.

When it stop next time check for spark as soon as possible. Are the plugs that you change out bad and not usable any more or can you use them again when they have cool down?

Yes I assume that, the coils are affected. When the coils are cold the insulation can be good, when they get warm the insulation can be bad and the windings maybe shorted. A crack in the coil is not a normal situation.

1-1,5 turn out from seated is a general setting for two stroke OBs. Some engines need up to 2,5 turn out from seated. The carbs who are mounted at Chrysler and Force OB are Tillotson or Wallboro brand and the low speed circuit in these carbs is acting at high speed too. If you have the air/fuel...

If you have the coils mounted at the block and there is no CD box you have a battery ignition system. The ignition system need a 12V battery to work. Check the coils for cracks, it is a common issue with this battery system. If you leave the keyswitch in RUN position when you do not run the...

Those two coils are lighting coils. I think your engine should have a lighting outlet at starboard side.

Pull off the rubber boot and check the spring. Maybe you can clean it up and reuse the spring. Otherwise there are a terminal boot kit, part number 63709A1.

No all 85 and 90 Hp are 3 cylinders with three carbs. The one carb 70Hp from 1991 and up with Chrysler/Force power head and Mercury gear case is a 3 cylinder engine. The 85 and 90Hp are good engines, old school design (cross flow chargning) from the 60.es and with newer electronic ignition...

Does it foul the plug and destroy it? Or is it the ignition coil that fail after about 1 hour? Do running at low RPMs (trolling) all the time or do you throttle it up and running at higher RPMs? Fouling plugs and make the plug to get shorted is due to the air/fuel mixture is to rich.

Are we talking about the 55Hp who was introduced in 1968 or the 55Hp from 1977 with twin carbs (818cc volume) which actually was the 60Hp from 1974 (with Magna Power II ignition system)? I suppose we are talking about the early 55Hp from 1968. These engines has the same LU as the 35 and 45 Hp...

Those three mechanics do not know what they are talking about. Have worked with outboards in 25 years and many different brands. That engine is fried, scored cylinder walls, scored pistons and the piston crowns are affected from overheat and or pre detonation.

Remember when you spin it with a drill, how fast does the drill spin? If you have a drill with one gear it only spins about 500RPM. The OB idle about 750-800RPM. Checking with a drill is not a sufficient check and why do you want to check the impeller! The impeller needs to be changed every 3-5...