Honda Spree and Elite 50 Forums

I believe that ignition timing on the Af16 should be about 17┬░ BTDC. That being said, you could always adjust base timing my adding or removing material from the trigger that is welded to the flywheel. I don't know enough about how the cdi works, and if there is any advance or retard going on at different rpm levels. That being said, on a 4stroke engine you can usual gain some low end power by advancing the timing slightly. I'm not sure if it would work the same way on a 2 stroke since there are so many factors that come into play with the way the engine works. Then when you throw different expansion chambers into the picture it makes things even more difficult. Also, while advancing the timing in an attempt to improve low end power, I think that the ignition system has to have some sort of ability to retard the timing at higher rpms for optimal performance. In fact, from the little that I know about this stuff, is that you can actually see more power and even a power curve that extends past the normal rpm range when you can retard the timing up high. I don't know if the ignition system does this on its own, but without that you can run into issues with pre-ignition and engine damage at the worst, and at the least see a reduction of power at higher rpms.

Even if you could find some gains, I personally dont think they woild anything that woild provide any real world increase in performance given it being such a small powerplant in terms of power made. As it stands, I don't think the reward out weighs the risk and unknowns invovled. I personally think that it should probably just be left alone unless someone had the ability to design an ignition that does what it needs to do through the rpm range of the engine, and has the testing capabilities to back it up with some proven results.

As always, a clear and concise answer from graphite9.

High compression enjoys advanced timing. It helps keep the flame moving at lower speeds with higher compression
The easy way to advance timing, and not safely, is to remove your pick up sensor and modify the mount holes on it. Left is advance right is retard. You should check base timing after you do that of course.
And a 2t loves retarded timing as the rpms rise. To a point then it's too much retarded timing.

Its not about the cdi but that coil on a full stroker that makes me run so fast?

superfast1234 wrote:Its not about the cdi but that coil on a full stroker that makes me run so fast?

I would probably disagree. Unless your coil isn't firing correctly, I don't think that you are going to see any better performance between a properly firing OEM type coil and some super "high power, high voltage, race ready" coil unless for some reason your coil is starting to break up at higher rpms, which I don't believe that anyone has proven this is a problem with rpm that an Af16 may reach.