Topic: Keihin Jets for CB550F -- nowhere near my size?

[Tracksnblades1]

Hey Chicken,

I'll try to keep my reply short.

I also have a 77' CB550F all stock running 4300' up to 10,000' in the canyons.

Same issue on stock jetting, black plugs, bogging, ect.

Went to 90 mains, 35 slows, and 2mm higher float height, 2 degrees advanced ignition. Bike runs like a dream now with perfectly tan plugs.

To answer your initial question of where to buy: Sigma Six Jet on ebay, they will make you whatever size of jet you want, and do a good job too in my experience.

hope this helps, -Kyle

MG,

The 2mm higher float settings. Just making sure. Does that result in higher fuel level in the carb bowels or lower?
Just trying to see which way you were fine tuning..

I’ve used lower fuel level in the bowls on a 750F1 looking for that perfect slow throttle transitions on slow low long uphill grades, when experimenting with oval pods and open exhaust.. The F1’s have their own emulsion tubes and needles if imc. And they don’t have 7 clip needle positions like the more modern carbs do..

Thanks in advance..

[scottly]

I also have a 77' CB550F all stock running 4300' up to 10,000' in the canyons.

Same issue on stock jetting, black plugs, bogging, ect.

Went to 90 mains, 35 slows, and 2mm higher float height, 2 degrees advanced ignition. Bike runs like a dream now with perfectly tan plugs.

If a completely stock bike is fouling plugs at only 4300 feet, something is wrong!

Lol, sorry, I should clarify, growing up my dad used "fouling" interchangeably with "running rich", or "black plugs". I suppose that's a bad habbit, the bike never did foul plugs in the conventional sense, just make them jet black.

Thank y'all for the complements, It's hard to beat the looks of the 550f. 

I'm with your dad, jet black plugs are carbon fouled from a too rich mixture.

[Mikerts_Garage]

Hey Chicken,

I'll try to keep my reply short.

I also have a 77' CB550F all stock running 4300' up to 10,000' in the canyons.

Same issue on stock jetting, black plugs, bogging, ect.

Went to 90 mains, 35 slows, and 2mm higher float height, 2 degrees advanced ignition. Bike runs like a dream now with perfectly tan plugs.

To answer your initial question of where to buy: Sigma Six Jet on ebay, they will make you whatever size of jet you want, and do a good job too in my experience.

hope this helps, -Kyle

MG,

The 2mm higher float settings. Just making sure. Does that result in higher fuel level in the carb bowels or lower?
Just trying to see which way you were fine tuning..

I’ve used lower fuel level in the bowls on a 750F1 looking for that perfect slow throttle transitions on slow low long uphill grades, when experimenting with oval pods and open exhaust.. The F1’s have their own emulsion tubes and needles if imc. And they don’t have 7 clip needle positions like the more modern carbs do..

Thanks in advance..

I believe it was 2mm higher float levels - so less gas in the bowls. This was 4 years ago now that I was dialing it in, so I could be wrong. I'm certain the jetting was 90 and 35 though.