Dave wrote on 03/28/23 at 04:09:08:och wrote on 03/27/23 at 10:13:47:I am anticipating my jet kit to hopefully arrive today, I already have everything apart. What size pilot and main jets should I use?
Also, can someone explain the white space mod a little?
My "Go To" jetting is a #150 main jet and a #50 Pilot Jet. Once in a while a #52.5 Pilot Jet is needed to get the idle fuel/air mix correct. Warm the bike up completely and while holding the bike upright lower the idle speed down - then turn the fuel mixture screw to achieve the smoothest idle. If you have turn the screw in the bike should begin to run poorly...then back the screw out until it runs smoothly....then turn the idle speed back up to 1,100rpm. If you can turn the fuel screw out more than 3 turns and the engine still runs smoothly...a #52.5 pilot might be better. If you can turn the idle mixture screw all the way in and the engine still runs smoothly - the pilot jet is too big. (The idle speed needs to be set low while making this adjustment....at 1,100 rpm the carb is allowing fuel to flow out the needle jet and will not allow you to make accurate fuel/air screw adjustment).
The white spacer pushes the slide needle down by the thickness of the spacer, and the stock setting is a bit too lean. By cutting the white spacer in half the needle is allowed to move upward a bit and that allows a bit more fuel to flow. You can use 3 steel machine screw washers instead of cutting down the spacer - you can't use brass washers as the outside diameter is too big....only the steel ones will fit.
Thank you Dave. I haven't drilled out the plug that covers the mixture screw, it may be a good time to do so.
What size are the stock jets? I assume they are smaller than #150 and #50?
I am in NYC, which are only 30 feet above sea level, but sometimes I go to the mountain - just last Sunday I took the bike to the Pocono mountains where the elevation is over 2,000 feet. At times the bike felt weird, going over 70mph giving it just slightly more gas the RPMs jumped up immediately but the bike was barely acceleration.
My only mod is the Dyna muffler.