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Pods n' jets

  • Thread starter Thread starter Anonymous
  • Start date Start date
KEITH KRAUSE said:
You mentioned in your first post, you plan to keep the jet needles in their same positions. If they ARE in the stock position, I would at least raise the needle 1 position (lowering the clip) if your needles are adjustable. I can't tell you how well the Uni's flow but they will allow a lot more air in than the stock air box. In fact, 1 position richer may not be enough, but it's a starting point.
You spend the most time riding on the needle circuit, so don't overlook it. A hot running motor will be the result.
Click to expand...

The stock needles were ditched when I had a jet kit installed for the 4-1 pipe. They are adjustable and set to the position recommended for the kit. I have a slight flat spot in the low-mid range so I'd raise them a notch or tow if I was keeping the stock airbox (minus cover). If I go with pods then I think the needles should stay put while I find the correct main jet.

I know carb tuning is half way between art and science so I was looking for a starting point to get a leg up. Disregarding the needles does anyone have a recommendation for an initial main and pilot?

BTW, I'll try the Rustoleum BBQ paint on the pipes. Haven't tried that one yet... And I think I'll consider the K&Ns more closely too.
 
Did they give you two choices of main jets in your kit? If so, I would try the smaller of the two. If adjusting your mixture screw does'nt help enough, I would go up 1/2 size on the piot jets. Regarding the needle position, I have found the "base settings" to usually be lean if the filters are K&N's. At steady cruising speeds, do you feel any surging or hesitation or "spitting" out the carbs?
I would install the smaller main jets and adjust your mixture screws for the highest idle and re-set the idle. Also, take off the two floatbowl vent tubes.
I would then take your bike out for a steady 5 mile run at 75 mph and immediately shut off the throttle, pull in the clutch, turn off the key and pull over for plug reads. Adjust the needle according to what the plugs say. After the needle circuit is good, I would ride the bike again 5 miles at a steady 30-35 mph, note performance and chop the engine off as before and read the plugs. If rich, turn the mixture screws in a turn and re-test. If lean, turn the screws out 1 turn and re-test. If still lean and more than one additional turn out on the mixture screws does'nt work, I would return them to where they were and go up 1/2 size on the pilots.
Then I would open it up and see how the mains perform.
It's common to first install mains that are too large, and install the needles at a "base setting" that's actually too lean. The bike may feel good with the throttle wide open at first, but as you raise the needles the bike suffers and boggs at roll-ons from cruising speeds to wide open throttle. The hardest part of jetting (to me) is the "overlap" of the needle and main. It can be hard to find a combination that works well at all rpm's. Sometimes you can't have everything perfect. I will sacrifice a bit of top end to have a bike that rolls on without bogging/flat spots. Everyone has there own way, but I like to get the needles set first and then see if I can increase the mains.
 
filters

filters

lounge guy.i'm in the same boat my bike is in pieces too.i hope to have it back together in about a month. then when yours is done maybe we can hookup for a ride. im up inthat area all the time. my brother lives in bradenton.my step brother too. they are deputy's in manatee and sarasota co. they also ride.although not gs's
 
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