oil:gas ratio 1957 Johnson Seahorse 7.5hp

[pro-crastinator]

You will be amazed after you get her on the lake - at the absence of the ever feared - cloud of blue smoke.
Of course, if you wanted to generate smoke, I'm sure theres a way to do that......

 

[Medicman613]

I don't know why she won't run! plugs are sparking fine, and after every 10 pulls or so it backfires! Gah! Never ending....

 

[kbait]

Try swapping plug wires..

 

[Chinewalker]

Yep, sounds like misplaced plug wires. FRONT coil fires TOP cylinder.

 

[F_R]

Have you even bothered to look at the coils? That motor has cracked coils unless they have already been replaced. And you are wasting your time if it does. Having spark doesn't impress me at all. Take a look. You can do that by removing the recoil starter and the thin plate from the top of the flywheel. BTW, you've come to the right place---iboats sells new ones.

 

[Medicman613]

Thanks guys for all the help. Will look into the coils next. I'm working my through problem by problem. I'm determined though! She will run by the time the ice melts.

 

[TN-25]

Make sure to run ethanol-free gas in that motor. In Ontario, Shell Gold has no ethanol, Silver has up to 5% ethanol, and Bronze has up to 10% ethanol. Gold has the highest octane rating of the three but your motor doesn't need the higher octane; use the Gold for its ethanol-free properties.

I have pretty much the same motor as you but its a 58 model. I run 16:1 BRP because I do not get another chance with the bearings. You can't just buy new blocks for these old motors. Bronze bushed motors need the oil film thickness.

 

[Medicman613]

Can someone explain to me these bronze brushed bearing things? they are foreign to me and I cannot seem to find too much information On them.

 

[pro-crastinator]

A engineer friend of mine told me that there were bronze bushings that were (are?) in service - constant service - for over 100 years.
Bear in mind that these were huge bearing surfaces that were moving at relatively slow speeds (steam - power generation & water pumps)
Ridiculously durable IF KEPT LUBRICATED. Roller bearings tend to be superior in high speed applications but also must be lubricated.

 

[racerone]

A properly sized bronze bushing that is lubricated as designed will last for years and years.--Have taken many of these motors apart with no noticeable wear on the bearings.-----------Worked in a place where a 150 ton rotor operates on soft babbit bearings.---A properly designed lube system keeps them running 24 / 7 with no wear on the bearings !

 

[Medicman613]

Where are these bronze bushing thingy ma jigs located on my motor?! No idea what they are and I would like to visualize them.

 

[racerone]

The crankshaft spins in 3 bushings.----They are cast into the block.---------The big end of the rods have a bushing cast in.----The small end of the rod is also a bronze bushing.

 

[nwcove]

heres a pic of the front half ( carb side ) of a bushed omc. your crankshaft rotates in these bronze bushings.