Dt3 timing advance
DT3 did not have the advance feature.
RT325 wrote: forgot to add, do it up tight too, or bad things happen. Have a look over at 'armpit' post THE armpit, i put a pic up there i think. Bit over the top tightening but you get the idea, or they stuff the key then shaft & taper if it lets go.
Yea I saw that. I held mine with a strap wrench and torqued it to 29 ft lbs.
The trick to 2-stroke ignition is to get it to retard after it has advanced, then you get the real power from the engine. The rate it retards needs to match the engine's port timing and the use the machine is being put too. For example I supplied an ignition for an MX360 for dirt track racing. It advances just a couple of degrees, then from 3,000 RPM retards off massively, giving a smooth soft power curve that gives lots of power but lets the rider keep the rear wheel spinning with no sudden surges.
The same ignition with an MX timing curve gives a much larger advance and then starts retarding around 4,500 at a much steeper rate making the expansion chamber work hard and produce high peak power. The low rev range advance keeps the power band wide as the advance makes power low down, while the porting is sub optimal, and gives hard acceleration by moving heat the expansion chamber when the revs are high enough for the porting to be optimal. This makes the engine really sit up and go.
Edit, sorry that was more directed at Rex's Speedshop.