Quote:
Originally Posted by SYCARMS
No, as I said the coil and cdi is more than sufficient for a stock engine. You will not achieve any gains from a coil or cdi until you do major upgrades to the engine. Your current cylinder efficiently rate is currently at appx. 55%. In other words the total cylinder a/f volume is only filled to about 55%. By going to an open filter and rejet you will only increase a/f efficiency to around 60 some %. The stock 15KV coil is more than enough at this rate. The cdi has several functions, first it tells the coil when to fire and for how long. This is called the timing map. The new buggies with DC cdi's the cdi has been mapped for the heavier buggy which will have different timing events(map) as compared to the much lighter scooter. The cdi's on the market are mapped for the much lighter scooter with
exception to the adjustable cdi which are expensive and from my experience due to using an adjustable dash pot for adjustment which loosens up due to vibration after time and will not hold the adjustments. Second is the duration of the spark which is more than efficient for current a/f volume. Third is it controls the max rpm the engine will produce which should be around 7500-7800 rpm. Your engine in stock form quits making power at 7500 rpm so raising the rpm limit is of no help and will only hurt the engine over time due to the over revving. Until you reach a total cylinder a/f volume of 75% or greater the coil and cdi will be of no advantage.
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nice post man very informative.