How much of a noticeable power gain is there?
As previously stated, advancing the timing will not produce any more power.
What will happen is that the power you have will come on earlier at a lower rev.
You may experience a little loss in the high register of the pipe.
If you read rthe following article it will fill you in.
http://justyamahard350.com/articles/eric.htm
Here is an an excerpt from it.
AFFECTS OF THE IGNITION TIMING
Here is how changes in the static ignition timing affects the power band of a Japanese dirt bike. Advancing the timing will make the power band hit harder in the mid range but fall flat on top end. Advancing the timing gives the flame front in the combustion chamber, adequate time to travel across the chamber to form a great pressure rise. The rapid pressure rise contributes to a power band's "Hit". In some cases the pressure rise can be so great that it causes an audible pinging noise from the engine. As the engine rpm increases, the pressure in the cylinder becomes so great that pumping losses occur to the piston. That is why engines with too much spark advance or too high of a compression ratio, run flat at high rpm.
Retarding the timing will make the power band smoother in the mid-range and give more top end over rev. When the spark fires closer to TDC, the pressure rise in the cylinder isn't as great. The emphasis is on gaining more degrees of retard at high rpm. This causes a shift of the heat from the cylinder to the pipe. This can prevent the piston from melting at high rpm, but the biggest benefit is how the heat affects the tuning in the pipe. When the temperature rises, the velocity of the waves in the pipe increases. At high rpm this can cause a closer synchronization between the returning compression wave and the piston speed. This effectively extends the rpm peak of the pipe.
idk if i ever will get there but being close would be nice.
I really don't know why i waited so long. I used a round file i use to sharpen my chain saw with, and a little elbow grease. I personally feel the difference. Seems like power band kicks in sooner and pulls better the whole way through.. I've only made it to third gear so far. I will be going out riding soon and see how things go.. I will update again later. Also doing a plug chop to be safe.. One more thing but its of topic but i added the 5" wheel spacers on the front and they are actually made better than what i thought. Bike seems allot more stable. I'm only worried if ball joints are going to wear prematurely. Looks like there putting more stress on them..
