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Tuning Question 83 550e

  • Thread starter Thread starter 550ERAT
  • Start date Start date
A smooth idle and a decent pull down low, but breaking up at a higher rpm is a sign of a weak ignition. This is because as the rpm's increase, you need a progressively stronger spark.

What bothers me is that the left carb wanted the air screw turned out farther than the right.... So either the left carb's main circuit is still plugged up, or cylinder #1 and #2 is doing all the work, thus needing more fuel.

Now each carb circuit does have some overlap. So the pilot jet does "help" the needle jet and the main jet circuit "some". But if your dialing in almost 2 turns more on one side vs. the other, then your close to your problem.

I forget what my current main jets are, but I do know that all of my pilots are the same, all the air screws are 2? turns out and cylinder #1 & #4 and #2 &#3 have the same main jet. What's yours?

Try installing a good set of plugs and swapping your coils from left to right. If the problem moves over then you've got a bad coil.
 
Thanks...assuming the ignitern or coils are bad, do i need to get the exact same one for make/model year? ebay has several, but from different years and larger displacement....
 
Buying used ignition coils is a crap shoot ~ they could be bad too. So unless the seller is willing to waranty them, you might have to pop for new ones.

A few dealerships out there can actually test them correctly. That is, instead of using an ohm meter, they will actually put a load on them. That's how I discovered I had a bad coil. 2 dealerships insisted that I had a good coil after an ohm check, but I just couldn't get it running. A third one finally load tested it and pronounced it bad. $125 and 2 months later I had a good running motorcycle again.

So before you buy, let your fingers do the walking and find a dealer that can actually load test it. It's possible that even an auto shop might be able to check it out. And then you'll know.
 
There is a way to test ignition coils with an electrical ohm meter. Billy Ricks is an excellent person to ask about electrical issues.
 
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