Still playin' with the winter projects.
@Dave Taylor did some sweet work welding and reinforcing the fairing stay on my db4.
I threw some primer on it for now. Undecided on powder coating or paint.
The Aprilia got new fork seals and a stiffer spring. I don't think the left fork had ever been opened. Oil smelled terrible! Left side is the spring. Right side is damping. Right side was newer oil but very low. I took 275ml out, put 350ml back in.
Next task is to install the oil injection pump so I can stop running pre-mix, which is driving me crazy. The pump has several advantages besides convenience. It's variable, so less oil at idle, more at WOT/high rpm. It also feeds directly to the main bearings. Two strokes are notorious for seizing at high rpm overrun. Shut the throttle at 12,000rpm and the amount of oil going into the engine drops to barely anything. The pump is connected to the powervalve controller, so I'll keep getting full oil at anything over 8500rpm. Finally, I think it will be much less messy. The airbox it always coated in oil.
Unfortunately, the previous owner broke one of the fittings to a cylinder head and I'm missing a cover to protect the lines, so I'm waiting on a shipment from the Netherlands (!).
While waiting, I installed some LED signals, which was more work than I expected. The dashboard light is connected to both sides of the bike. When signals are activated on one side, power flows through the bulb and grounds through the opposite side bulbs. They don't light because only a tiny bit of power is needed. Unfortunately, it's enough to light the LEDs on the opposite side so all four blink. Not useful. The solution is a couple diodes and a grounding wire, as so:
My life has improved considerably since I bought a decent set of crimpers.
More details here if anyone cares:
AF1 Racing is a top-rated authorized Aprilia, Vespa, Piaggio, Moto Guzzi, Zero, Energica, Ural and SWM
www.apriliaforum.com