Fuel blend ratio & water flow

[fishindad71]

This is a great forum! I?ve got an older 7.5HP 1969 Sears outboard made by McCullough. The model number is 574-60210. Do you know the proper oil / gas ratio for this? I made up some 32:1 fuel but it seems to produce more smoke than I expected.
Also, for this same motor, I?m replacing the impeller as a standard precaution. How much water should be coming out of the motor via the impeller and where should it be exiting? I see the ?usual? pair of holes on the back of the leg, but I also see an outlet on the side of the leg. When I removed the lower unit, I noticed an aluminum tube running from the water pump to this outlet on the side of the leg. I?ve never seen any water coming from that outlet when the motor was running but I was able to see sporadic spitting of water out the ?normal? two holes on the back of the leg.
Thanks,
Kenny

 

[steelespike]

Re: Fuel blend ratio & water flow

Fuel mix is 48:1 Motor will seem more smokey in a barrel or on a hose.
The motor has Bailamatic 2 impellers one to cool and one to bail the boat
with the proper foot for the hose.

 

[fishindad71]

Re: Fuel blend ratio & water flow

Thanks for the fuel ratio.
I was aware of the two impellers, but what does the "bail the boat with the proper foot for the hose" mean?

thanks,
Kenny

 

[Lion hunter]

Re: Fuel blend ratio & water flow

Scott-Atwater made a device "Bail o Matic" a hose ran fron the tube to a weighted foot that sat inside the boat. Worked as a bilge pump. Kind of a Rube Golberg type thing but still neat.

 

[Bifflefan]

Re: Fuel blend ratio & water flow

Scott-Atwater made a device "Bail o Matic" a hose ran fron the tube to a weighted foot that sat inside the boat. Worked as a bilge pump. Kind of a Rube Golberg type thing but still neat.

Thats something id love to see. Some of the coolest, most interesting things, are also some of the wierdest things.

 

[F_R]

Re: Fuel blend ratio & water flow

Thats something id love to see. Some of the coolest, most interesting things, are also some of the wierdest things.

The weighted foot had a screen in the bottom to keep trash and old bait out of the bailer pump. As long as you somehow screen the water, you don't really need the proper foot.

I don't remember anybody saying it specifically, but the bailer hose attaches to that pipe on the side of the motor. Cooling water sprays out the holes on the rear, not the bailer fitting.

 

[Lion hunter]

Re: Fuel blend ratio & water flow

Heres a pic of the "Bail a Matic".

 

[fishindad71]

Re: Fuel blend ratio & water flow

Thanks so much to each of you for your replies. Of course I don't have the manual so your help is invaluable.

As an interesting side note this is motor has an electric starter. I'm told that it is one of the first items made using a rechargeable NiCad battery. There's a large U-shaped battery assembly on the top of the motor just under the cover. I've replaced the diode assembly related to the starter, and hoped I could bypass the battery using a 12V marine battery, but had no luck.

thanks again,
Kenny

 

[Lion hunter]

Re: Fuel blend ratio & water flow

Any idea of the voltage and amperage of the battery on the motor? May not be 12 volts. Did you get the diode the correct way? I would imangine that if you supplied the correct voltage to the starter it would turn if the starter is good. If it requires a low amp battery you may look into emergency lighting systems batteries. They can be had in 6 or 12 V, are low amp and are rechargable.

 

[fishindad71]

Re: Fuel blend ratio & water flow

No idea of the voltage and amperage of the original as there are no markings and I don't have an owner's manual. I did first try a 6V, then later a 12V before replacing the diode. I was careful to place the diode exactly as I found the original. Again I tried a 6V lantern battery and later a 12V boat battery and even though the running light on the outboard works, the starter doesn't seem to be getting electricity. The starter seems to be in good shape as the engine seems to have been neglected in a garage for decades (cosmetically very good / little used. original paint still on the bolt heads.)
Is there an easy way to test the starter without blowing the diode? I seem to remember being told that applying an external battery source or even cranking the engine by hand to start it could damage the diode, but that doesn't seem to make much sense to me since the engine includes a starting rope.

 

[Lion hunter]

Re: Fuel blend ratio & water flow

Should be able to clamp the starter in a vise and supply voltage directly to it. Is there a solenoid and have you checked it (can short across). Take a volt reading at the starter if there is no voltage there, work your way back to the problem part. And there is no way a lantern battery has enough amps to turn that motor.