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Carb Setup
Without the use of a chassis dyno, the only way that you have for tuning is trial and error. But you do need a baseline and this should be the stock setup. You may have a different exhaust and air filter configuration, but you do not know if the stock setup is right for that unless you try it. Start with stock and read the plugs after a road test. Then make changes if needed. You may see that the OEM setup is good. People have always thought that more is better, but only sometimes is that true.
I am currently doing a test on an SF (1979 Special). Bike has stock everything. I was looking for a little better power curve through the RPM range.
The change that I made was to the pilot and pilot air jets. Left mains the same. Some people say that the jets that I changed to were what came in the original 1978E. I have not actually seen that published.
So the change was from 42.5 pilot jet to 45 and from 180 pilot air jet to 205.
I did notice a positive change in the power curve. It beame smoother with better throttle response. The plugs have a brownish (correct) color. Yes, I liked the difference. The unknown is what may have changed with the MPG. I am currently checking that and will post later.
Once you get them right, they will stay right for a long time. Good luck. Besides, it is not a big deal especially since you are not using the stock (in the way) air filter housing. I would guess that you will only make one or maybe two changes at the most to get it where you want it.
MP
Without the use of a chassis dyno, the only way that you have for tuning is trial and error. But you do need a baseline and this should be the stock setup. You may have a different exhaust and air filter configuration, but you do not know if the stock setup is right for that unless you try it. Start with stock and read the plugs after a road test. Then make changes if needed. You may see that the OEM setup is good. People have always thought that more is better, but only sometimes is that true.
I am currently doing a test on an SF (1979 Special). Bike has stock everything. I was looking for a little better power curve through the RPM range.
The change that I made was to the pilot and pilot air jets. Left mains the same. Some people say that the jets that I changed to were what came in the original 1978E. I have not actually seen that published.
So the change was from 42.5 pilot jet to 45 and from 180 pilot air jet to 205.
I did notice a positive change in the power curve. It beame smoother with better throttle response. The plugs have a brownish (correct) color. Yes, I liked the difference. The unknown is what may have changed with the MPG. I am currently checking that and will post later.
Once you get them right, they will stay right for a long time. Good luck. Besides, it is not a big deal especially since you are not using the stock (in the way) air filter housing. I would guess that you will only make one or maybe two changes at the most to get it where you want it.
MP
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