Originally Posted by michiganteddybear
the amount the timing changes is minimal. many (me included) feel like performance is slightly better, but thats just the butt dyno measurement
I have considered messing with the stock timing (5-25 BTDC) to try to get a bit more out of it. Maybe bump it 2 degrees for 7-27 BTDC? Some guy asked the question on another forum
6 years ago, but the thread died.
My truck (I know, I know, vastly different engine...5000CC...V8...Single plug per cylinder...etc) has ignition advance starting at 14 BTDC base timing, with both vacuum and RPM advance on top of that. For the Vulcan to have a base timing of 5 seems like an opportunity for a bump in HP, throttle response and MPG, but it all depends on how close to the edge Kawasaki set it from factory. The dual plugs reduces the need for spark advance.
I will be 100% honest, I'm new to carburetors & distributor systems, so I'm not exactly sure how timing is measured. All I know is, changes in acceleration seem minimal right now, but starting up seems a lot easier, which was always my main problem.
I grew up on Fuel Injection, so I'm learning all this stuff too. Head over to the link I posted above from the other forum, as the 2nd to last post talks about ignition advance theory better than I could write up. The timing measurement is outlined in the Kawasaki service manual on page 272 (if you download the service manual from this
thread). It requires a timing light to measure.