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Bike runs the same a with 3 and 4 unplugged

  • Thread starter Thread starter Guest
  • Start date Start date
G

Guest

Guest
Just for kicks I did a little experiment. I unplugged 3 & 4 and discovered the engine ran exactly the same as it did with those 2 plugged in. Definitely time to tear it down.
 
Don't tear it down yet.

Follow the leads back to their coils. It is possible they got swapped some time in the past, and are firing their plugs at the wrong time.

I'm sure you know this, but one coil fires 1&4, the other one fires 2&3.

Also before tearing anything apart, check valve clearance, carb sync and mixture screw settings.
Just to be sure it's not missing one of the key ingredients for combustion, fuel, compression, fire.

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i think the carb sinc on this bike is called the "idle adjustment" hehe.
read his sig...this is a turbo frankenmonster with a stock engine.
i believe it is wounded as per his other threads....
 
I thought I had seen that he was working on another bike, one that is not mentioned in his sig. :-k

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It's the gs. I'm just posting this for you guys for the heck of it. I'm not sure what's wrong with my bike besides a blown head gasket. I'm tearing it down soon to see what I find. Other bike is good.
 
gasket could be blown between the cylinders or the crank may have twisted.
you will know soon enough..
 
The inside of the cylinders are nasty looking. They're all scored and rusty and in general not very smooth and clean. I can feel where the rust is. This is after roughly 1000 miles of running. It sat 14 years before I got it.
 
Got it. A little more severe persuasion.
No obvious signs of turbo related failure. The head gasket is intact as far as shape but very dirty around the area that I saw the oil. Also, the number 4 spot on the head is very souty, along with the plug. This is new.
 
Bike ticking over like nothing's happened when you've pulled a plug lead isn't nec. anything bad. It could simply mean that the cylinders which *do* cause the donk to stall when you pull the lead off, are the "strong" cylinders.
It's actually an old skool tuning method. Find your 'strong' cylinder at idle, and slightly drop the slide for that carby.
 
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