QuestionHi Mike,
I have performance questions for you. My 88 FXRS has the following: Screaming Eagle Hi-Flow Air-Filter, 40 mm CV Carb, SE-11 Cam, Screaming Eagle 10.2:1 Forged High Compression Pistons, and Python 3 Exhaust. I have the stock ignition. (Question Is there any advantage, Dual Fire vs. Single Fire?) People are telling me to use a Single Fire set-up. Other people say Dual fire Screaming Eagle, I just want to know the next logical step that is best to follow.The bike runs great, But I have what I call Starter Stall when I fire it up (I am using a new battery)I know the 10.2:1 Forged High Compression Pistons make the starter work harder. Would the Single Fire help this and perform best Or should I stay with the dual fire? Thank You in advance, I just found your site the information you have in your site is great. Thanks for putting it out there.
Ride Safe J.C.
AnswerLets start with the difference between the two. The duel fire fires the plugs at the same time. This means that the one cylinder is firing at the correct time for it, but the other is off, due to the fact that each rod is running on the same crank pin. Also, it is firing on the intake as well as the exhaust stroke.
With a single fire, each plug works independently of each other. Plus the plug only fires on the compression stroke.
Now, what does this mean to you? The bike will run smoother, since its not firing on the exhaust stroke. It will be a little easier to start, but it will not solve the starter stall. You will not gain some horsepower, but its not even enough to notice. Is it worth the price on putting it on? I will have to let you be the judge of that.
In order to solve the starter stall you will either need to go with a high torque starter or install compression releases.
Good luck and happy riding
Mike
