71 Johnson 60HP - Amplifier woes

[scrimg]

Hi All,<br /><br />I need some advice on what to do with a crook Amplifier box for my 71 60HP Johnson. <br />A new one is really expensive (around $300 Australian) and mine is broken (no output). Does anyone have a circuit diagram so that I may fix it or is it possible to replace it with an aftermarked CDI unit designed for a car?<br /><br />Any help most appreciated.<br /><br />Gordon.

 

[Trent]

Re: 71 Johnson 60HP - Amplifier woes

Nope..But you can get aftermarket by CDI Electronics. $199.00 US.

 

[petryshyn]

Re: 71 Johnson 60HP - Amplifier woes

Gordon:<br />Where there's a will, there's always a way...<br /><br />>can't find a used one?<br />>do you have a schematic of the engine?<br />>do you have a manual?<br />>have you done the troubleshooting?<br /><br />*fixing the 'pack' is not hard, its getting into it through the sealant that's the challenge, and sometimes not possible.<br /><br />I don't have a schematic for a 71 60hp engine, and I don't know what you have for an ignition, but I'm sure I could find a used pack for cheap, and if not, something that could be retrofitted.<br /><br /><br />

 

[clanton]

Re: 71 Johnson 60HP - Amplifier woes

Schematic, it is a battery powered CDI, with points for a trigger.

 

[petryshyn]

Re: 71 Johnson 60HP - Amplifier woes

Gordon:<br /><br />Hate to sound stupid (probably too late for that) Is your dollar the same as US? If not, how does it compare?<br /><br /><br />Clanton:<br /><br />Never worked on one. Never seen a schematic.<br />Is it safe for me to presume he has 2 sets of points and a charging stator under the flywheel? No CDI charging coil? No condensers?<br /><br />>Should I come up with a cheap electronic automotive retrofit, or has that been done.....<br />

 

[clanton]

Re: 71 Johnson 60HP - Amplifier woes

Schematic,<br />Yes, 2 sets of points, stator under flywheel for charging battery only. There is 2/3 different packs (I think) for this engine. Engine is 3 cylinders.

 

[clanton]

Re: 71 Johnson 60HP - Amplifier woes

Try this, 12 volt automotive coil with a ballist resistor, condenser, L77jc4 sparkplug. Should be one wire from points under flywheel, connect to - side of coil, condenser connected to -side of coil. disconnect power pack and remove, locate switched hot wire to pack, connect to resistor, from resistor to + side coil. The condenser is to reduce arcing at the points, I dont know what size condenser.<br />Schematic should be able to put this in schematic form.

 

[petryshyn]

Re: 71 Johnson 60HP - Amplifier woes

Clanton:<br /><br />This system interests me....<br /><br />>Do you have a schematic on this system?<br />>2 sets of points.....3 cylinders?<br />>1 wire coming from under flywheel?<br />>how many coils?<br />>distributor?<br />>is there waste spark?<br /><br /><br />Now you got my interest!!

 

[scrimg]

Re: 71 Johnson 60HP - Amplifier woes

Thanks Guys,<br /><br />Our Oz dollar is worth half a US so a $199 pack will cost us at least $400!.<br />I can see how the auto coil, resister and condensor will fit but does anyone have any idea about replacing the existing pack with a CDI unit from a car?<br />I am pretty keen to fix this motor as it has only done 53 hours since new and runs like a clock (when it goes).<br /><br />Thanks<br /><br />Gordon

 

[petryshyn]

Re: 71 Johnson 60HP - Amplifier woes

Gordon:<br /><br />If you can supply me a diagram, or atleast answer my questions in the previous post, I will suggest a retrofit, but not until I have an understanding of the system......

 

[clanton]

Re: 71 Johnson 60HP - Amplifier woes

Schematic, diagram on the way.

 

[scrimg]

Re: 71 Johnson 60HP - Amplifier woes

Details of schematic are :<br /><br />3 Cylinders<br />1 Coil<br />2 sets of plugs under flywheel<br />Distributor under flywheel<br />1 Black/White wire coming from points to amplifier<br />1 Purple input to amplifier (12 volts)<br />1 Grey output wire to coil primary<br /><br />Amplifier draws about 100 ma (my book says it should draw 200). There is no output voltage from the amplifier at all even when the input (black/white) wire is pulsed to earth (as mentioned as a test in my manual).<br /><br />Does this help?

 

[petryshyn]

Re: 71 Johnson 60HP - Amplifier woes

Gordon:<br /><br />While i'm waiting for clanton's diagram, <br /><br />>check to see how many lobes (bumps or humps) are on the point cam. (the profile which opens the points)<br /><br />I'm still puzzled why there is 2 sets of points if it has a distributor....(unless they need extended dwell for the high RPM)<br /><br />I'm hoping the diagram will shed some light.<br /><br />If all is as it seems, we may be able to adapt a Ford TFI module for cheap.....I'd choose that because it looks for a positive voltage to trigger, and is smart enough not to power coil if engine stopped. Thats the problem with using a conventional module from a inductive type pickup system....it would power the coil if the key was on and engine stopped with points open.....This would burn the coil in a few minutes....

 

[petryshyn]

Re: 71 Johnson 60HP - Amplifier woes

Thanks Clanton, Got the diagram:<br /><br />>as clanton says, it would be easy to convert to a conventional ignition with a ballast resistor and a conventional coil. It would be the easiest and fastest. You will be replacing points more often, but hell, not that often.<br /><br />>You could convert to an electronic system. Module will run 5-10 bucks at a wrecker. A little experimenting and away you go.....I'd only recommend this if you are a hobbyist or mechanic.

 

[clanton]

Re: 71 Johnson 60HP - Amplifier woes

I have heard of the Ford TFI module being used, but only with a magnetic trigger.

 

[petryshyn]

Re: 71 Johnson 60HP - Amplifier woes

 

[petryshyn]

Re: 71 Johnson 60HP - Amplifier woes

 

[petryshyn]

Re: 71 Johnson 60HP - Amplifier woes

I've thought this out, and believe if the points get dirty, it could misstrigger the TFI module resulting in engine damage...<br /><br />Best to use a conventional coil, ballast resistor and condenser.....as clanton suggests....

 

[clanton]

Re: 71 Johnson 60HP - Amplifier woes

The Ford Duraspark 1 may have had points, in one of my old books I found a diagram for a ford transistorized system with points, the book is copywrite 1970. Back to what Trent said, rebuilt pack from Rapair, or used one.

 

[petryshyn]

Re: 71 Johnson 60HP - Amplifier woes

Clanton<br /><br />Its easy to convert a magnetic pickup module to a point type of triggering. He would have to use the old type of ignition coil. Thats what I was trying to avoid (old style coil) But it certainly can be done. Just depends how much retrofitting he's capable of.....