9.9 Evinrude

[jmendoza]

Re: 9.9 Evinrude

The rubber bushing is part of the prop, it's in the middle or hub or the prop. Many times it's cheaper to just to get another prop.

 

[chead98]

Re: 9.9 Evinrude

Do you know for sure that you have spark on both cylinders?

If I remember correctly, it's a single cylinder and it has spark. I'm almost positive I changed the plug. It's a 1981 9.9 Envinrude. Here's a picture.
(I think)

 

[chead98]

Re: 9.9 Evinrude

The rubber bushing is part of the prop, it's in the middle or hub or the prop. Many times it's cheaper to just to get another prop.

I pictured it up in the shaft. I may just get a whole new prop.

Thanks

 

[bktheking]

Re: 9.9 Evinrude

That motor is a twin, 2 cylinders- 2 plugs.

 

[chead98]

Re: 9.9 Evinrude

That motor is a twin, 2 cylinders- 2 plugs.

It is, okay, I'll take your word for it.

Thanks

 

[chead98]

Re: 9.9 Evinrude

The rubber bushing is part of the prop, it's in the middle or hub or the prop. Many times it's cheaper to just to get another prop.

whoa, I just priced the prop. $277. The Bushing assembly is $16. I think I'll be changing the bushings.

Thanks

 

[bob johnson]

Re: 9.9 Evinrude

your prop will not cost you $277!!!!!!!!!!!!!

ask at any marina your prop in aluminum will be $95 max....

and if you shop around maybe even $50..

you cannot fix your old prop yourself , if the hub is spun..and it probably is..i bought a 1990 15 hp which uses the same exact prop and is almost the same motor and the prop was spun as well on my motor!!!

I picked up a used prop at a local shop used for $15!!!

do not try to buy hub parts...you will end up looking at a compnent system used for larger motors.

i am not sure, but I dont think they make interhcangable hubs and props for your size motor!!!

they do for motors who need $277-$500 props!! ha ha ha

did you even do any of the suggestions offered yet??

like make a mark across the prop and inside hub and then go run the motor , and come back and check to see if the marks are still lined up with each other????

on my spun prop, i could easily see bit of rubber torn up along the out dia of the rubber where it meets the metal.


PS you are mixing up teminology..hubs and bushings are SIMILAR things, but the same things!!!

you can't use a new hub and fix it yourself, and you probably dont need new bushings...



good luck

bob

 

[wilde1j]

Re: 9.9 Evinrude

What you lose when using a long shaft motor on a 15" transom is performance. It'll work, but the top end will be reduced BC of the unneeded drag associated with more motor in the water. If you could make, say, 25 knots with a proper motor/boat match, a too deep motor might yield more like 22 or 23 knots.

Where you really get in trouble, though, is when you try to use a short shaft motor on a boat with a 20" or bigger transom. Typically. in that case, you can never get the boat to plane, even though you may have adequate HP otherwise.

 

[Joe Reeves]

Re: 9.9 Evinrude

The 9.9hp models does not incorporte a shear (drive) pin. It has a splined propshaft that locks onto a splined thru hub propeller.

The propeller is a 3 piece unit..... bronze hub and a standard aluminum propeller, with the propeller attached to the bronze hub with vaulcanized rubber. If the rubber fails, this allows the bronze hub to spin within the propeller.

A long shaft engine cannot function properly when installed on a short shaft transom. The extra engine length creates its own drag and if it is possible to obtain any kind of speed, a rooster tail is usually and normally a unsightly result.

Now.... DO NOT ever open up the throttle (if possible) on a engine while in neutral unless you want to chance a runaway engine and have connecting rods go flying thru the side of the crankcase.

In gear (the problem)...... Does the engine rpms increase to the normal full throttle rpms while the boat slows down? Does the engine rpms NOT increase to the normal full throttle rpms when you open the throttle. We need a detailed explanation of what exactly is taking place.

 

[chead98]

Re: 9.9 Evinrude

The 9.9hp models does not incorporte a shear (drive) pin. It has a splined propshaft that locks onto a splined thru hub propeller.

The propeller is a 3 piece unit..... bronze hub and a standard aluminum propeller, with the propeller attached to the bronze hub with vaulcanized rubber. If the rubber fails, this allows the bronze hub to spin within the propeller.

A long shaft engine cannot function properly when installed on a short shaft transom. The extra engine length creates its own drag and if it is possible to obtain any kind of speed, a rooster tail is usually and normally a unsightly result.

Now.... DO NOT ever open up the throttle (if possible) on a engine while in neutral unless you want to chance a runaway engine and have connecting rods go flying thru the side of the crankcase.

In gear (the problem)...... Does the engine rpms increase to the normal full throttle rpms while the boat slows down? Does the engine rpms NOT increase to the normal full throttle rpms when you open the throttle. We need a detailed explanation of what exactly is taking place.

Hi Joe, great questions. Lets see if I can answer them.

When in netural it can produce very high RPMs (thx for telling me NOT to do this) but when I put it in gear, it has very low RPMs and goes very slow. In other words, when in gear, the RPMs pretty much match the speed, very low. By the sounds of the very high RPMs in netural, you would think when you place it in gear it's gonna fly across the lake. But that's not the case. I will try marking the prop to see if there's slipping most likely this weekend.
If this forum could take videos, I could show you how it moves in gear.

Thanks again,
Chris

 

[chead98]

Re: 9.9 Evinrude

your prop will not cost you $277!!!!!!!!!!!!!

ask at any marina your prop in aluminum will be $95 max....

and if you shop around maybe even $50..

you cannot fix your old prop yourself , if the hub is spun..and it probably is..i bought a 1990 15 hp which uses the same exact prop and is almost the same motor and the prop was spun as well on my motor!!!

I picked up a used prop at a local shop used for $15!!!

do not try to buy hub parts...you will end up looking at a compnent system used for larger motors.

i am not sure, but I dont think they make interhcangable hubs and props for your size motor!!!

they do for motors who need $277-$500 props!! ha ha ha

did you even do any of the suggestions offered yet??

like make a mark across the prop and inside hub and then go run the motor , and come back and check to see if the marks are still lined up with each other????

on my spun prop, i could easily see bit of rubber torn up along the out dia of the rubber where it meets the metal.


PS you are mixing up teminology..hubs and bushings are SIMILAR things, but the same things!!!

you can't use a new hub and fix it yourself, and you probably dont need new bushings...



good luck

bob

Hi Bob from your quote, "like make a mark across the prop and inside hub and then go run the motor , and come back and check to see if the marks are still lined up with each other"
- Can I test this in a barrel of water in my garage?

Thanks, Chris

 

[Joe Reeves]

Re: 9.9 Evinrude

The above "mark on hub" test cannot be done in a barrel.

Slow rpms in gear match the speed....... Unlikely you have a spun hub of the prop. If a spun hub, at slow speed the boat would probably move along, at a high throttle setting the engine's rpm would be very high and the boat would slow down (if it got up speed in the first place).

Your last explanation to my questions indicate that you have a engine problem rather than a propeller problem.

Check the compression. What are the individual readings?

Check the spark. With the spark plugs removed, the spark should jump a 7/16" gap with a strong blue lightning like flame.... a real SNAP! Does it?

The 7/16" gap is important. Note.... do not attempt to check the spark by using the spark plugs which gives a false reading and is a total waste of time.

Spark plugs should be Champion QL77JC4 plugs gapped at .030 or .040 . The gap setting is optional.... performance varies on some engines.

Describe the appearance of your present spark plugs as best you can.

 

[bob johnson]

Re: 9.9 Evinrude

chris like Joe sayes, it appears as if the issue we weree trying to pin down( a spun hub on your prop) isnt the problem..if it were , when you put the motor in gear and tried to go, the rpms would rise, like they do in nuetral ,BUT you wouldnt go very fast, you would still go slow!

you apparently have another issue...spark or fuel delivery..

with no load motors can sounds fine..

you should check your compression readings....

I am lost myself with electronic issues...good luck

bob

 

[bktheking]

Re: 9.9 Evinrude

Sounds like you aren't firing on both or a fuel delivery problem, when this happens they fall on their face. This is typical of an ignition problem, will rev no problem in neutral but won't under load.

 

[bob johnson]

Re: 9.9 Evinrude

Sounds like you aren't firing on both or a fuel delivery problem, when this happens they fall on their face. This is typical of an ignition problem, will rev no problem in neutral but won't under load.

he cant be firing on only one cylinder!!!!!

the motor would never run on one cylinder?? would it?

he may have weak spark....but not firing at all??


the motor isnt powerful enough to push itself over on only one cylinder.

( i wouldnt think)..maybe a 30 hp -50 hp twin cylinder motor to run on one cylinder, but a 9.9??

bob

 

[chead98]

Re: 9.9 Evinrude

Wow, lots of helpful advice here. Thanks a bunch.

Joe, from your quote,
- "Check the compression. What are the individual readings?
It will take me years to determine this. lol I'm hesitant to find out how to do this, but willing to learn. I just wish I had a pond in my back yard...
- I will check the spark and see if it jumps a 7/16 gap. I'm hoping it will be something simple I can resolve my self. I'm looking forward to troubleshooting. It will be a celebration when I get it. Okay,mabey just a beer ot two...
Bob/bktheking, I will check fuel delivery . Thanks guys

 

[bktheking]

Re: 9.9 Evinrude

he cant be firing on only one cylinder!!!!!

the motor would never run on one cylinder?? would it?

he may have weak spark....but not firing at all??


the motor isnt powerful enough to push itself over on only one cylinder.

( i wouldnt think)..maybe a 30 hp -50 hp twin cylinder motor to run on one cylinder, but a 9.9??

bob

Yes it will, I've pulled off one plug lead on the 9.9's and they will run. And when only one is firing they won't rev like they do when firing on both. As for fuel delivery, remember my 15 with mr.zip tie stuck in the reed, same symptom, had spark on both , would run on one cylinder- the top one, with the bottom wire off it would rev up no problem but as soon as it was in gear it had zero power. The open reed was causing it to deliver too much gas and wouldn't fire. As soon as I put it back together I tested the theory and ran it on just the bottom cylinder to check to make sure it was firing and sure enough it fired up on just the bottom cylinder.

 

[Rick.]

Re: 9.9 Evinrude

he cant be firing on only one cylinder!!!!!

the motor would never run on one cylinder?? would it?

he may have weak spark....but not firing at all??


the motor isnt powerful enough to push itself over on only one cylinder.

( i wouldnt think)..maybe a 30 hp -50 hp twin cylinder motor to run on one cylinder, but a 9.9??

bob

In fact, they run smooth as silk on one cylinder. They even almost get you up to plane and will troll all day one one cylinder. They just lack good snap and top end speed on one cylinder. Rick.

 

[bob johnson]

Re: 9.9 Evinrude

In fact, they run smooth as silk on one cylinder. They even almost get you up to plane and will troll all day one one cylinder. They just lack good snap and top end speed on one cylinder. Rick.

well then that right there would suggest he has totally different problem that spark issues....

you would think a fuel delivery problem would manifest itself in nuetral and a little reving....as the OP has already stated he revved it good( even though it is bad) and it sounds good ...but in gear he cant get it to rev at all...

not like a high speed jet issue....cant get going..low speed fuel delivery would be the same in nuetral and in gear at slow speed...right?

I am going to test my 6 hp and my 15 hp for the one cylinder firing power

it is hard to grasp...that a little 9.9 could get a boat moving along on one cylinder!!!

bob

 

[Joe Reeves]

Re: 9.9 Evinrude

Chead98.... Compression gauges are pretty cheap, available at K-Mart, Wal*Mart, Auto stores, etc. They come with a rubber press on tip, and can be purchased with a screw in tip at a somewhat higher price.

The press on tip kind are the most widely used.... just have some one help you by either holding the gauge in the plug hole or cranking the engine over.

Check the spark with the spark plugs removed. Set the spark gap to 7/16".

You can buy a spark tester or.................

(Spark Tester - Home Made)
(J. Reeves)

A spark tester can be made with a piece of 1x4 or 1x6, drive a few finishing nails through it, then bend the pointed ends at a right angle. You can then adjust the gap by simply twisting the nail(s). Solder a spark plug wire to one which you can connect to the spark plug boots, and a ground wire of some kind to the other to connect to the powerhead somewhere. Use small alligator clips on the other end of the wires to connect to ground and to the spark plug connector that exists inside of the rubber plug boot.

Using the above, one could easily build a spark tester whereas they could connect 2, 4, 6, or 8 cylinders all at one time. The ground nail being straight up, the others being bent, aimed at the ground nail. A typical 4 cylinder tester follows:


..........X1..........X2

.................X..(grd)

..........X3..........X4