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Old 17 August 2009, 16:06   #1
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60hp clamshell problems and parts

Had the SR4 out today.
Fresh fuel and engine started fine. Goes into gear and runs ok upto half throttle where it dies. Its the same forward and astern.
At one point it did manage to run through the rough spot to WOT and it was ok, did this for about half an hour then played up again.
Revs freely in neutral and starts first time after it dies.

Cleaned the filter and the line going to the engine. Plugs were wet when removed.

I'm planning on changing the plugs and leads and seeing if this help?
Anyone got a contact for clamshell parts?
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Old 18 August 2009, 08:33   #2
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Mine went from running like a hobbling dog to quite smooth with a new set of plugs & leads. Was running nicely for about a minute - bummer about the spark advance & the ensuing bang.........

Mine also ran fine at idle as well before the change. On the original leads, check where they come out the coils - the corner is really sharp - one of mine had about 4 strands of copper actually left intact.

Not had to buy any "obscure" parts yet, but when I was talking to Uncle Al at Barrus he was convinvced he could source any new gaskets / fuel pump / water pump parts I needed. So I guess any Merc dealer for the "consumables" (Gaskets etc). Mitchells in Glasgow have stuff like that, and what they don't have they can order. Someone on Ebay on the south coast was breaking one about 6 months ago, although it may have been a 70 ...
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Old 18 August 2009, 17:00   #3
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Just spoke to the local Mercury dealer... 70 for three HT leads, getting my brother to make some for a crate of Stella.

Trying new plugs and leads tomorrow along with cleaning the carbs, well my brother is.
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Old 19 August 2009, 04:33   #4
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70?????

errr 15.90 for three at my local Auto factors......
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Old 19 August 2009, 05:11   #5
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70?????

errr 15.90 for three at my local Auto factors......
Struggled to find one that would do them, hence I've enlisted younger brother to fix the whole thing for 36 bottles of Stella (that includes making the frame for my hatch too).
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Old 19 August 2009, 12:38   #6
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Just make sure he drinks the stella AFTER he does the job....
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Old 19 August 2009, 12:54   #7
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New plugs in, shot a load of carb cleaner through check the leads and its still fecked.
Its now in the local boat yard as I go back to work tomorrow so hopefully they will sort it?

I personally think it could be the Flux Capacitor, but no one seems to stock one for a mid eighties clamshell?
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Old 19 August 2009, 13:26   #8
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Quote:
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70?????

errr 15.90 for three at my local Auto factors......
I've been thinking about changing the leads on my engine and gulped at the price from Mercury. Thought I'd be able to get some made up cheaper. Except...
1. They have a screw thread to fit into the ignition coils.
2. Looking at the manual, each lead has a very different resistance specification.

Maybe the resistance is a function of the lead length and it's just standard plug lead stock. Perhaps each plug lead really is a different spec. Maybe it's a red herring. Any thoughts?

I must say that since I've been working on my engine myself, the engineering seems rather more subtle than is first apparrent and I wonder if this plug lead thing is another case in point.
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Old 20 August 2009, 03:42   #9
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Alystra,
Interesting. How much of a difference? I guess if you are running a 4- stroke it's going to be realtively new & high tec - I would have thought that for that you would need to have different sized coils - are they differet betwen cylinders.

The clamshell is good old "ram it in / friction type of HT connectors, but at the same tiome it is also a lot less high tec than yours is!


Chewy,
With wet plugs & new electrics My next suggestion was going to be the carb float(s) allowing too much fuel through at Mid range, but I guess too late now.......
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Old 20 August 2009, 06:54   #10
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Quote:
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Alystra,
Interesting. How much of a difference? I guess if you are running a 4- stroke it's going to be realtively new & high tec - I would have thought that for that you would need to have different sized coils - are they differet betwen cylinders.

The clamshell is good old "ram it in / friction type of HT connectors, but at the same tiome it is also a lot less high tec than yours is!


Chewy,
With wet plugs & new electrics My next suggestion was going to be the carb float(s) allowing too much fuel through at Mid range, but I guess too late now.......
Spark plug lead resistance.
Cyl. 1 4500 - 10700 ohms
Cyl 2 3300 - 8000
Cyl 3 3700 - 8900
Cyl 4 4300 - 10200

Replacement recommended if outside those limits. The engine is year 2000, the last of the carbed 90 4str., so it's not ultra high tech. It's CDI, but not quite in the 'computer age'. There are two identical ignition coils, each feeding two cylinders. I haven't checked the wiring length yet to see if there's a direct correlation between length and quoted resistance.

The screw threads are to allow the leads to be changed. The smaller engines of that era have the coils and leads as one piece units (according to the book). I'll be investigating over the winter.
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