1971 John 9.5hp...30lbs compression what needs to be replaced?

[Solittle]

Re: 1971 John 9.5hp...30lbs compression what needs to be replaced?

Do you get 30 pounds in both cyl or just one? Either way I'm bettin you are looking at a tear down & rebuild.

 

[wolfgang123]

Re: 1971 John 9.5hp...30lbs compression what needs to be replaced?

Sure sounds like you high speed circuit is dirty. I mentioned it some time ago. That would be my thing to do now. Is there any chance you not getting a good seal with your compression gauge? Rick.

forgot about that....looks like i will break down the carb then on Saturday and clean her out. By circuit do you mean the jet or needle or something else?

and the compression gauge will hold the 30 psi for like 10 minutes maybe more never let it sit longer than that haha

 

[wolfgang123]

Re: 1971 John 9.5hp...30lbs compression what needs to be replaced?

Do you get 30 pounds in both cyl or just one? Either way I'm bettin you are looking at a tear down & rebuild.

both read out 30lbs on the money.....like i said nothing looked scored while i had the head off but i am thinking new rings should be all i need?

 

[Rick.]

Re: 1971 John 9.5hp...30lbs compression what needs to be replaced?

forgot about that....looks like i will break down the carb then on Saturday and clean her out. By circuit do you mean the jet or needle or something else?

and the compression gauge will hold the 30 psi for like 10 minutes maybe more never let it sit longer than that haha

Sorry for not being more clear. What I'm wondering about is the connection of the gauge in the plug hole. Are you certain you have no leak from those threads? Regarding the high speed circuit, I am talking about removing the high speed orifice plug and cleaning it and the passage from both directions and then blowing (from both directions) with compressed air. The needle and all passages need to be cleaned and blown out as well. Rick.

 

[wolfgang123]

Re: 1971 John 9.5hp...30lbs compression what needs to be replaced?

okay another update:

the spark does not jump the 1/4" gap.... also no matter where i hold the spark plug wires (hold with my hands) i get shocked???? maybe a short somewhere ?

 

[Haffiman]

Re: 1971 John 9.5hp...30lbs compression what needs to be replaced?

forgot about that....looks like i will break down the carb then on Saturday and clean her out. By circuit do you mean the jet or needle or something else?

and the compression gauge will hold the 30 psi for like 10 minutes maybe more never let it sit longer than that haha

That at least proves that the valve in your gauge works!!

 

[wolfgang123]

Re: 1971 John 9.5hp...30lbs compression what needs to be replaced?

OKay well i took her out on the water today and she ran okay but still no speed the rpms seems to rev up and go much higher after the de-carb.

At this point i have decided that i am going to do a carb kit and ignition overhaul, because at this point i fear rebuild so i might as well do it all. i already bought the carb kit but what all needs to be replaced for igintion overhaul?

Points
Coils
Consendsors

anything else?

 

[AlTn]

Re: 1971 John 9.5hp...30lbs compression what needs to be replaced?

plug wires and terminal ends

 

[jbjennings]

Re: 1971 John 9.5hp...30lbs compression what needs to be replaced?

You say one cylinder is 30psi. What's the other cylinder's compression?? Did you post it and i just missed it?
The motor will run with just 1 cylinder working. Lots of folks think they're running really nicely when it's really running on only one cylinder---until they take it to the lake and give it full throttle and if falls on it's face.
You probably have carb problems and ignition problems as well based on what I've read in your thread. However, I wouldn't spend a dime on it until you know you have good compression in both cylinders. The 9.5 motors that run well that I've tested had about 80psi in both cylinders. I agree that compression gauges and compression gauge operators can vary greatly and be unreliable, but if you're getting 30psi on one and 70 or 80psi on the other, you may have problems that require more than just a carb cleaning and ignition tune-up.
Just my opinion,
JBJ

 

[wolfgang123]

Re: 1971 John 9.5hp...30lbs compression what needs to be replaced?

You say one cylinder is 30psi. What's the other cylinder's compression?? Did you post it and i just missed it?
The motor will run with just 1 cylinder working. Lots of folks think they're running really nicely when it's really running on only one cylinder---until they take it to the lake and give it full throttle and if falls on it's face.
You probably have carb problems and ignition problems as well based on what I've read in your thread. However, I wouldn't spend a dime on it until you know you have good compression in both cylinders. The 9.5 motors that run well that I've tested had about 80psi in both cylinders. I agree that compression gauges and compression gauge operators can vary greatly and be unreliable, but if you're getting 30psi on one and 70 or 80psi on the other, you may have problems that require more than just a carb cleaning and ignition tune-up.
Just my opinion,
JBJ

No both are 30psi and i have done a cylinder drop test already. i am keeping this motor regardless of rebuild or not so i am going to do the ignition, carb, fuel pump (already did headgakset and water pump) just to be safe and if all that doesnt work looks like new piston rings.

so like i said carb kit on the way and ignition needs

Points
Coils
Consendsors
plug wires
terminal ends ? (like the plug boot at the end of the wire?)

I would like to post links to conferm the parts i need but i cant post links on this forum. i cant seem to find all the parts on iboats.

 

[AlTn]

Re: 1971 John 9.5hp...30lbs compression what needs to be replaced?

yes, plug boot and wire coil that fits inside it = terminal end...

 

[wolfgang123]

Re: 1971 John 9.5hp...30lbs compression what needs to be replaced?

okay so on this page:
http://www.iboats.com/Johnson-Tune-...9179231--session_id.911381623--view_id.271401

i need part #:

9.5

1964-1973

18-5006
out of stock

which looks to be points, condensors. (still need oil whicks?)
-------------------------------

Then i will also need

Sierra Ignition Coil 18-5181

http://www.iboats.com/mall/partfind...39=9.5&gd_search_14140=2&session_id=911381623

-------------------------------

and i am a little lost finding the new plug wires?

 

[wolfgang123]

Re: 1971 John 9.5hp...30lbs compression what needs to be replaced?

http://www.iboats.com/Boat-Motor-Sp...9179231--session_id.044702095--view_id.172285

This is all i can find. I never done spark plug wires before that werent plug and play. Do i really need all this? i feel like i could do it a little cheaper?

 

[Rick.]

Re: 1971 John 9.5hp...30lbs compression what needs to be replaced?

You don't need all that. I didn't see wire by the foot which is all you need. Saw this this morning and I have not bothered to check to see if the price is right but it is one stop shopping for sure. If wire and ends is all you need I would suggest you just stop in at an Evinrude dealer. They will have what you need. Measure the length you need cause they sole me 6 inches short once. A pain. Rick.
http://www.maxrules.com/fixomctunekits.html

 

[wolfgang123]

Re: 1971 John 9.5hp...30lbs compression what needs to be replaced?

You don't need all that. I didn't see wire by the foot which is all you need. Saw this this morning and I have not bothered to check to see if the price is right but it is one stop shopping for sure. If wire and ends is all you need I would suggest you just stop in at an Evinrude dealer. They will have what you need. Measure the length you need cause they sole me 6 inches short once. A pain. Rick.
http://www.maxrules.com/fixomctunekits.html

Price is way too high and i dont need all that since i have already ordered most of the other stuff. So where can get this spark plug boots and wire by the foot? anybody send me a link prease?