Topic: New Guy with a good old bike

[civicracer95si]

I have slowly!!! been bring back to like a 1975 CB550 Super Sport. I have the bike running now but have some tuning issues. Bike will idle at 2k without issue. Once I start adjusting the idle screw down she will die. I currently have rebuilt the carbs, bench synch them and vaccum sync at 2k (I know is wrong) Stock jets and needle clip position is stock. I also installed dyna Ignition system. Air box is stock with new paper filter from honda. Any advise will be appreciated.

[TwoTired]

Revisit those pilot jets. S/B #38 stamped on them.  Verify light can pass end to end.

Check fuel source for contaminants.  Even clean jets will block and plug with any particles larger than 0.016 inch.
I once cleaned the same carbs 3 times before discovering a prior owner had discarded the in tank fuel filter.

Be sure to have a good strong battery.  Check the voltage.  The bike's alternator doesn't make enough power to self excite the required magnetic field and run bike loads at idle speed.  If voltage falls, so does spark, and the ominous silence that follows.
Remove the headlight fuse for garage operations.  That will save 40-50 watts (using stock headlight) drain on the alternator's 150 watt peak output and only 40-50 watts output a idle speed.  With headlight on, the bike needs 120 watts whenever the key switch is on.

You have the stock exhaust?  (Impacts jetting)

Cheers,

[civicracer95si]

Thanks for the reply!
I have a 4-1 exhaust maybe kirker?
for the pilot jets I could in theory drop the fuel bowls and remove the jets that way to avoid complete tear down right?
I will double check voltage right now.

[TwoTired]

I have a 4-1 exhaust maybe kirker?

Expect to change the main jet and slide needle position away from stock settings.  I predict #100 Main and JN at 4th position from top.

for the pilot jets I could in theory drop the fuel bowls and remove the jets that way to avoid complete tear down right?

Yep, fixed many doing just that.

Cheers,