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rickmodee, super b, super b jetting, superb

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  #1  
Old 2nd June 2018
rickmodee rickmodee is offline
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Default carb intermediate jetting

upon checking my plugs after initial start up they seem to be burning way lean no discoloration. the

the plugs im using are autolite 4316 gapped at .020 with a Morris Magneto.
exhaust is straight pipes with baby fish tails front exhaust length is around 57", rear is around 45".


super b carb main jet is .066 and velocity stack

round one:
.0280 with 1 1/4 turns out idle mixture. went for a 10 mile ride. bike felt fine carb cough in low rpm when keeping consistent pressure on throttle in 3rd gear. its probably around 2500 rpm if I were to guess. checked plugs after the ride and they looked clean. (super easy start up, and nice idle)

round two:
.0295 with 1 1/2 turns out idle mixture. again went for a 10 mile ride. same carb cough. checked plugs- once again they looked clean. (start up was a little more tricky but got it dialed, once again steady idle)

round three:
.031 with 2 full turns out idle mixture. again went for a ride. same carb cough. checked plugs- the god damn same again (start up was a little bit of work, needed a higher idle and didn't seem smooth.


things im trying to accomplish:

1). validation that the carb cough is probably because the exhaust has no restriction and is not carb related at this point. Lollipops may be the solution
what else could it be if not?

2). why do my plugs look the same after swapping jets. do I have miracle plugs?

3). what jet do I run with my current setup without changing parts I currently have
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  #2  
Old 3rd June 2018
rickmodee rickmodee is offline
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spark plug gap was to tight which was making me not get an accurate reading.
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  #3  
Old 3rd June 2018
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ryder rick ryder rick is offline
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Originally Posted by rickmodee View Post
spark plug gap was to tight which was making me not get an accurate reading.
Are the 4316 plugs resistor plugs?


Yep, how long have you been using a mag?
No resistor wires or resistor plugs....
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Old 3rd June 2018
rickmodee rickmodee is offline
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They're the recoommended plugs from Morris magneto. This is my first mag firing bike
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Old 3rd June 2018
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Check for air leaks around throttle shaft bushings.
Also verify no mani leaks.
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Quote:
Originally Posted by rickmodee View Post
spark plug gap was to tight which was making me not get an accurate reading.
Interesting, I have always been told to use non resistor plugs with a mag to avoid starting problems.

Sent from my Moto G (4) using Tapatalk
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Old 3rd June 2018
rickmodee rickmodee is offline
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Quote:
Originally Posted by ryder rick View Post
Interesting, I have always been told to use non resistor plugs with a mag to avoid starting problems.

Sent from my Moto G (4) using Tapatalk
gap is set to .020, I haven't had an issue starting it yet but the weather has been nice
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Old 3rd June 2018
rickmodee rickmodee is offline
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Quote:
Originally Posted by ryder rick View Post
Are the 4316 plugs resistor plugs?


Yep, how long have you been using a mag?
No resistor wires or resistor plugs....
4316 are non-resistor plugs
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Gap is correct for a magneto. Spark has to jump 2 gaps to work - hence it's really jumping a 0.040 gap. Hard to do 0.050 with slow cranking speeds so gap is reduced to 0.020.
Sounds very much like the bike is coughing at about the point the main jet comes in. You might be going in the wrong direction with the inter jet change.

I don't rely on looking at plugs to determine the correct A/F ratio.
Almost no one does a plug chop correctly to start with. Unless you did a plug chp with brand new plugs at the RPM's where the problem was occurring your going to be looking at plugs that are colored working on either the main jet, idle circuit or some combination.

The transition from inter to main is actually one of the hardest tunes you can do. Just remember that it can be too rich as well as too lean.

Try looking for "stand off" if you think the pipes are at fault. Taje the air cleaner off if you have one. With the bike in neutral run the engine in the range the bike coughs. If you can see a "cloud"of A/F at the muth of the carb the pipes are a problem.
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