Does anyone have any tips for my db30's power and acceleration?
Well my friend I have 5 simple steps to make your 97cc (2.8hp) engine move that little DB30.
1. Weld up a header for it (I don't know if you can buy them or not).
2. Build a ram air intake out of PVC that comes out by your leg by the recoil, I did it and it made a reasonable difference.
3. Rejet the carb, get a set of numbered drill bits remove the idle jet and drill it out with the #77 bit. I did this an it worked good.
4. On the stock carb there is a black plastic tab, break it off carefully and you will now have access to the mixture needle, adjust it accordingly.
5. Set the gov arm springs to the highest up of the 3 holes, it will rev higher that way. (In the pic I show you do not drill the 4th or 5th hole, the pic is just for clearification on what spring to adjust.
This will result in a moderate speed/acceleration increase, for better acceleration and torque check out the PMR jackshaft kit. My DB30 with the 97cc (2.8hp) engine went 32 to 34mph (on GPS) but I bypassed the governor, and you should not do that I ended up blowing my engine because of it, but it could've been worse, the connecting rod could've came through the seat. I know it is tempting to do, and results in more power, but don't unless you have the billet con. rod and flywheel which are not availible for this engine.