1972 100HP Evinrude Starflite RUNNING. (VIDEO)

[ILLaViTaR]

Well thanks to everyones help on here I finally got the bloody thing started!!!!

http://www.youtube.com/watch?v=j5JO4E0ZA44

It's been sitting for 2yrs since I bought it last week, I first started it 2 days ago, it had a bad miss/lean sneeze but that seems to have disappeared since running today. I started it today, after 5min it died (first start of the day), I started it up again and all of a sudden it's idling a lot higher, it was so loud it scared the crap out of me (sounded like a 500rpm increase or something). Since this the "bad miss" has disappeared entirely.
Could this be caused by crap stuck in the carbies or something??

What do you think? Does it run any good? It sounds a bit rattly and sneezy to me around the 30 sec mark but I'm no marine mechanic.

It just randomly died at the end of the video (it does this randomly when the throttle idle is on lowest or close to), the fuel bulb seems to have lost pressure, I'm blaming the dying on a fuel line leak, from the video can you tell if it's a fuel or spark issue that causes it to die?


Any feedback would be greatly appreciated, Cheers.

 

[jetterbug]

Re: 1972 100HP Evinrude Starflite RUNNING. VIDEO!!

Re: 1972 100HP Evinrude Starflite RUNNING. VIDEO!!

How's the "tell tale" ? Sounds like to me it got hot. Did you check your water pump?

 

[ILLaViTaR]

Re: 1972 100HP Evinrude Starflite RUNNING. VIDEO!!

Re: 1972 100HP Evinrude Starflite RUNNING. VIDEO!!

How's the "tell tale" ? Sounds like to me it got hot. Did you check your water pump?

I was told if water comes out the exhaust ports on these motors in squirts/mist and it was so I assumed it was all running ok haha. I didn't check the water pump.

Do you think it really overheated? Have I damaged anything?

 

[F_R]

Re: 1972 100HP Evinrude Starflite RUNNING. VIDEO!!

Re: 1972 100HP Evinrude Starflite RUNNING. VIDEO!!

A mist out the exhaust ports is all you are going to get. It doesn't have a pee indicator. HOWEVER, we had a LOT of those motors that spun the hub in the impeller, causing instant overheating and piston destruction. You should replace the impeller, "just because". In fact, if it still has the aluminum pump housing, I suggest you replace the complete water pump with the plastic/stainless steel kit.

Motor sounds pretty good, but possibly running out of gas for some reason.

 

[ILLaViTaR]

Re: 1972 100HP Evinrude Starflite RUNNING. VIDEO!!

Re: 1972 100HP Evinrude Starflite RUNNING. VIDEO!!

A mist out the exhaust ports is all you are going to get. It doesn't have a pee indicator. HOWEVER, we had a LOT of those motors that spun the hub in the impeller, causing instant overheating and piston destruction. You should replace the impeller, "just because". In fact, if it still has the aluminum pump housing, I suggest you replace the complete water pump with the plastic/stainless steel kit.

Motor sounds pretty good, but possibly running out of gas for some reason.

Thanks mate I'll replace the pump asap.

Regarding running out of gas, what about a dodgy fuel line? It has a leak near the primer bulb and after 5min the firmness off the bulb is only around say 40%. Is the primer bulb meant to stay firm? Because if I wanted to I could reprime it 5-6 squeezes every 5min, not sure if this is normal or not (my first boat). Also I have to spray fuel into the carbies to get it started for the first time of the day. I could turn it on and off with ease after the first start, but if it hasn't been started in as little as 20hrs I need to spray fuel into the carbies. Is the fuel line maybe relevant to this?

 

[laotou]

Re: 1972 100HP Evinrude Starflite RUNNING. VIDEO!!

Re: 1972 100HP Evinrude Starflite RUNNING. VIDEO!!

I was told if water comes out the exhaust ports on these motors in squirts/mist and it was so I assumed it was all running ok haha.

My engine is 76 Johnson 85HP. If the motor is on muffs, the exhaust reliefs look like Figure 1. If the leg is in a tank, they spit more water as shown in Figure 2. From your video, heavy smoke came out the relief holes. That does not happen in my motor.

 

[laotou]

Re: 1972 100HP Evinrude Starflite RUNNING. VIDEO!!

Re: 1972 100HP Evinrude Starflite RUNNING. VIDEO!!

The previous owner of my engine told me to look at the water outlets. If the engine is on muffs and is at idle, water should flow out from the water outlets as shown in the attached pictures. That indicates that the water pump is working.

 

[laotou]

Re: 1972 100HP Evinrude Starflite RUNNING. (VIDEO)

I started it today, after 5 I started it up again and all of a sudden it's idling a lot higher, it was so loud it scared the crap out of me (sounded like a 500rpm increase or something). Since this the "bad miss" has disappeared entirely.

From your video, I can't see the throttle cam very well. It seemed the roller was still at the start position when the engine was at idle. If you can post a picture of the throttle cam, that will be helpful.

 

[ILLaViTaR]

Re: 1972 100HP Evinrude Starflite RUNNING. VIDEO!!

Re: 1972 100HP Evinrude Starflite RUNNING. VIDEO!!

The previous owner of my engine told me to look at the water outlets. If the engine is on muffs and is at idle, water should flow out from the water outlets as shown in the attached pictures. That indicates that the water pump is working.

View attachment 117523View attachment 117522

It seems to be running fine but one of the ports isn't pushing water out.

It's coming out the exhaust and every single place you say it should be in the pics, however in your 3rd picture it has the yellow arrow pointing to that little water jet below the muffs, well there's another one of those jets on the other side of the motor, water runs through it when the motor is off but when started it doesn't come out? But it comes out all the others/every one you've mentioned. Assuming it's meant to run like that.

Regarding the throttle cam I'm taking pics now! Thanks for your help!

 

[emdsapmgr]

Re: 1972 100HP Evinrude Starflite RUNNING. VIDEO!!

Re: 1972 100HP Evinrude Starflite RUNNING. VIDEO!!

Those engines do seem to rattle somewhat. A common characteristic. Actually sounds pretty good. It will get much quieter with the cowling on. Random engine quits can be a carb problem. If the idle passages have any restrictions (dried fuel accumlation over years of storage) that can cause abrupt stopping. If it's been stored for a while, you may want to pull the carbs apart and use some carb cleaner on the passageways inside the carb bodys. FR is correct about the mist from the exhaust relief ports. After a minute or so of running a cold engine, a water mist will start to come out of those ports. That indicates that the thermostat (vernatherm) has opened-a good sign. A mist is all you will get on that engine from those ports. If the engine continues to just quit-immediately check for spark with an inductive timing light-just to be sure it's not a spark issue. The primer bulb will get hard when you first pump it up prior to the first start each day. After that the bulb will soften somewhat while running-but should not collapse on itself. That's normal.

 

[ILLaViTaR]

Re: 1972 100HP Evinrude Starflite RUNNING. VIDEO!!

Re: 1972 100HP Evinrude Starflite RUNNING. VIDEO!!

Those engines do seem to rattle somewhat. A common characteristic. Actually sounds pretty good. It will get much quieter with the cowling on. Random engine quits can be a carb problem. If the idle passages have any restrictions (dried fuel accumlation over years of storage) that can cause abrupt stopping. If it's been stored for a while, you may want to pull the carbs apart and use some carb cleaner on the passageways inside the carb bodys. FR is correct about the mist from the exhaust relief ports. After a minute or so of running a cold engine, a water mist will start to come out of those ports. That indicates that the thermostat (vernatherm) has opened-a good sign. A mist is all you will get on that engine from those ports. If the engine continues to just quit-immediately check for spark with an inductive timing light-just to be sure it's not a spark issue. The primer bulb will get hard when you first pump it up prior to the first start each day. After that the bulb will soften somewhat while running-but should not collapse on itself. That's normal.

Hey thanks I'm planning to buy a rebuild kit for the carbies as soon as I can find one.

Unfortunately I've just stumbled across another problem. After things were looking so good too!!!! Basically there's smoke from the piston chamber escaping through a gasket.
The gasket sits between one of the heads and the block (starter motor side) and I noticed a powerful gush of faint smoke was escaping from a 1mm hole in the gasket, the gasket has blown.

Noticed it had started missing again once I pulled the bit of gasket out and made the hole slightly worse haha. Anyone know the gasket I'm referring too and what's involved?

EDIT: Turns out to be the cylinder to crankcase gasket according to the parts catalog, in summary what does that involve. just removing the heads?

Cheers.

 

[emdsapmgr]

Re: 1972 100HP Evinrude Starflite RUNNING. VIDEO!!

Re: 1972 100HP Evinrude Starflite RUNNING. VIDEO!!

Hard to tell exactly what you mean by the cyl to crankcase gasket. Two possibilites: 1. the head gasket has failed. Not a big deal. pull the head and replace it, torquing to factory specs. 2. If the crankcase string seal between the two halves of the powerhead is missing/deteriorated-that's another thing. The whole engine will have to come apart.

 

[ILLaViTaR]

Re: 1972 100HP Evinrude Starflite RUNNING. VIDEO!!

Re: 1972 100HP Evinrude Starflite RUNNING. VIDEO!!

Hard to tell exactly what you mean by the cyl to crankcase gasket. Two possibilites: 1. the head gasket has failed. Not a big deal. pull the head and replace it, torquing to factory specs. 2. If the crankcase string seal between the two halves of the powerhead is missing/deteriorated-that's another thing. The whole engine will have to come apart.

Pretty sure it's the crankcase string seal. This is it here: http://www.ebay.com.au/itm/160551560812?ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1439.l2649
Looks like I could seal it up with some goo but I'd rather do it properly.

The gasket sits between between the cylinder heads and cylinder block. I realise I need to take a bit off the motor to get to it but how much exactly? Do I have to remove the plugs/heads pistons and internals? Or can I do it from the opposite direction by just removing the carbs, then cylinder block and access it from there?

 

[emdsapmgr]

Re: 1972 100HP Evinrude Starflite RUNNING. VIDEO!!

Re: 1972 100HP Evinrude Starflite RUNNING. VIDEO!!

The 314964 is the spaghetti seal between the two crankcase halves. You will have to remove the powerhead from the midsection and lay it on it's back on a bench. Remove the flywheel, intake (and carbs,)the front half of the block and the fuel pump. (you will not have to remove the crank or the upper/lower crank bearings or pistons, heads or exhaust covers.) Probably best to remove the ignition too-it will be in the way. You will see where the seal goes when you get the front half of the block off. When you have it down that far, you might want to change the upper and lower bearing crank seals as a preventative maint. task. This is close to a major teardown, so expect to spend some time on this. You will want to have a factory service manual to refer to while doing this work. It is not complicated- just time consuming. Good Luck. One other thing, possible the ethanol in today's fuels was responsible for the rubber seal deterioration...

 

[laotou]

Re: 1972 100HP Evinrude Starflite RUNNING. VIDEO!!

Re: 1972 100HP Evinrude Starflite RUNNING. VIDEO!!

one of the ports isn't pushing water out.

A forum member found out that the calcium buildup was the culprit in his case.
http://forums.iboats.com/showthread.php?t=497298&highlight=exhaust+relief

well there's another one of those jets on the other side of the motor, water runs through it when the motor is off but when started it doesn't come out? But it comes out all the others/every one you've mentioned. Assuming it's meant to run like that.

Mine does the same thing.

 

[ILLaViTaR]

Re: 1972 100HP Evinrude Starflite RUNNING. VIDEO!!

Re: 1972 100HP Evinrude Starflite RUNNING. VIDEO!!

The 314964 is the spaghetti seal between the two crankcase halves. You will have to remove the powerhead from the midsection and lay it on it's back on a bench. Remove the flywheel, intake (and carbs,)the front half of the block and the fuel pump. (you will not have to remove the crank or the upper/lower crank bearings or pistons, heads or exhaust covers.) Probably best to remove the ignition too-it will be in the way. You will see where the seal goes when you get the front half of the block off. When you have it down that far, you might want to change the upper and lower bearing crank seals as a preventative maint. task. This is close to a major teardown, so expect to spend some time on this. You will want to have a factory service manual to refer to while doing this work. It is not complicated- just time consuming. Good Luck. One other thing, possible the ethanol in today's fuels was responsible for the rubber seal deterioration...

Thanks for all your help mate. Sounds like a lot of work but I'm willing to put in the time and effort. Now I just need to wait for my repair manual to arrive in the post!

 

[ILLaViTaR]

Re: 1972 100HP Evinrude Starflite RUNNING. VIDEO!!

Re: 1972 100HP Evinrude Starflite RUNNING. VIDEO!!

Thanks I'll defintely be checking this out, last thing I want to do is cook it after all the parts I've just ordered!

It's just that one jet (same as yours) that doesn't operate when engine running. So it would seem the cooling system is running normal, I still might replace the impellor incase as I've been told it's recommended.