Topic: 75 cb550f rich on all cylinders

[gerry113377]

I have clean and synched the carbs and tank valve and cleaned the air filter but went ahead and ordered a new one (but haven't got it yet).  Timing and charging is good.  It runs good for 5 minutes after I clean the plugs, then they foul up on all cylinders.  It does NOT have a stock exhaust.  They are 2:1 on each side.  It is loud so I don't think there is much packing in them but I love the way it sounds.  But if it is absolutely necessary to repack I guess I'll do it.  Haven't checked plug gap yet but will do it tomorrow.  They are new plugs  d7ea ngk.   Anything else I can do?  Do i need to repack?  Like I said I love the sound.

[TwoTired]

Paper filters can only be "cleaned" so many times.  Their job is to trap particles, which they do very well.
They can never be completely cleaned.   That's why Honda has a yearly replacement schedule.

A restrictive filter deepens the carb throat vacuum, which causes greater flow from the metering jets relative to the air passing through them.  Ergo sooty spark plugs.

[gerry113377]

Just want every one to know problem solved by switching to self cleaning iridium plugs (ngk).  They were expensive but did the trick.

[ieism]

Solving a rich condition with "self cleaning plugs"    Great.

I have iridium plugs myself, can't see how this would solve a rich condition. They're just plugs. Maybe a self cleaning airfilter would be a better solution

[gerry113377]

I can at least drive the bike now until I have the time and money to figure it out.  Before I couldn't even go up a hill without it wanting to die.  Now it runs like a champ.