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Started My 1975, 115 This afternoon

tboltmike

tboltmike

Regular Contributor
Had some good weather this afternoon and decided to see if I could get fire.

Laid 'er up last Oct, ran the carb bowls down and doused it with fogging oil. Kept the battery on the maintenace charger.

Gave it a once over, connected the battery, fueled it, got the water going, gave it some warm up throttle, spun it chock off, clicked the choke. It hit in about 10 revs and purred like a kitten, well more like a tiger.

This has been a great engine. As much as I would like an ETEC, this one just won't give me an excuse.

Not sure what OMC did this year, but they did it right!

Want to thank the contributers/moderators on this for helping me keeping this engine up and going thru the years.
 
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With the proper maintenance, that motor will last you a LONG LONG time. I love the old V-4's that have been treated with TLC. LOL I too would love a newer motor but my 1983 115 has not given me a reason and my bank account will not support that purchase either.
 
If the 75 115 is original it may have the " pressure back ring " high up on the piston.----------------Many of those failed miserably.
 
Most products, when they work are considered fantastic ! ---------------- It is when you need repairs that real quality shows up.------------Some things are easy to repair and others are " throw it away and buy a new one "
 
Hey Mike,

I have a '75 Evinrude 115 on my Sidewinder, it must have well over 2000 hrs and it runs perfect. Nice to be TX it has been cold and snowy in MA this winter. 100_4224.jpg
 
Irishmist77 said:
Hey Mike,

I have a '75 Evinrude 115 on my Sidewinder, it must have well over 2000 hrs and it runs perfect. Nice to be TX it has been cold and snowy in MA this winter.View attachment 1763
Click to expand...

Hey Irish,

Good looking rig. Got pictures showing a rooster tail!

Have you had any major repairs to yours? I am the second owner of mine, but has been in the family since new. The power head has never been opened and I don't think the carbs have opened either and no electrical replacements. I have had the lower unit resealed twice, three water pumps (no failures just prudence) and the prop shaft carrier O-ring replacement.

It has always started right up. I do run the carbs near dry after use. I apply the choke to get a rich mixture in the system as it dies.
 
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Not sure, as it looks the power head is original. I have owned the boat since '96, like you I have replaced the water pump a few times. I had no indicator spray at idle so I removed the exhaust plate, cleaned the carbon and it cleared right up.

Question- Does yours smoke upon start up even warm between short shut downs? I run 50:1 -- I have been using it in Boston inland water ways and harbor and in the locks after restart sometimes I have to lift high idle and it starts fine but smokes and I get looks (north east tree huggers). I have only decarbed once a couple seasons ago and will do it this spring.-- Do you think I have carbon biuldup where it is holding my reeds open a crack (while shut down) and it's loading up with fuel??

Thanks,
Rob
 
Rob,

When running on the hose, it smokes profusely. Great during mosquito season.

It to smokes when idling in the water. I would guess that the premix 50:1 is richer than needed at low speed. The low cylinder temps at low speed may not burn the oil as well as when under load.

The idle lever is needed when first start and cold, but after that it is not needed.

Might want to post a separate question on the reeds. One of the moderators could better answer than me. However, I would suspect that if the reeds were not sealing the engine would not run or not run well.

What is WOT speed on your rig? Mine is a tri-hill and gets 38 to 40 depending on the conditions. I had posted a performance chart on mine a while back. I put in a fuel mgmt system that measures fuel flow and speed. It calculates MPG and I plotted charts from the data.
 
Reed valves are far away from the combustion chamber.--------------If you have carbon on them you have real problems !!
 
Thanks Mike- I agree about the reeds, the motor runs well so I think I might run 60:1. As far as WOT I am spot on with you 38 to 40 with a 19 pitch aluminum. My tach has never worked but I would bet about 5000. I will look for your chart, very interested in fuel consumption, I have calculated (roughly) that I get about 4 MPG at 18 MPH.

Here are a few pics of Boston harbor-- quite the boating spot.
100_4205.jpg100_4206.jpg100_4207.jpg
 
These early V-4 motors had the " pressure back rings " high up on the piston.------Many of them failed ( broken rings ) and damage above the top ring ( tapered )------------Some motors appear to have survived . and maybe not over revving them has something to do with it.------------A tachometer is almost a " must have " and running at 60:1 is a mistake !!
 
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