Ok so for those of you without a powervave servo setup ( 3BN owners) the usual drill here is to wind the PV round 180deg clockwise, giving you a kick up the arse at 6krpm and absolutely nothing below it.
I didnt like riding the bike like that around town so i wound it back to its factory position which meant she went alright up to about 8.5k rpm, then had nothing.
So today i got bored and decided id have a go at finding a happy medium.
I removed the exhaust so i could see what was going on, then removed the PV cover. With the PV in the factory position, you can see where the standard two pin holders are ( two holes directly opposite eah other. )
Remove the PV locator ring, and mark halfway between the two holes. Then mark halfway between the Factory hole, and the mark you just made ( approx 45 Deg from the standard hole moving clockwise).
Now fire up the angle grinder and grind a Slot into the locator ring, where you just marked.
now refit everything and turn the PV until the new hole you just grinded lines up with the right hand side allen bolt hole. Pop cover back on and screw into place.
The bike will now have Slightly less power below 6krpm, and a good bit more after 6krpm. The bike should now rev out to 9.5/10krpm. Check your mixture and adjust accordingly. I noticed that although the mixture was perfect, i was having pre-det ata round 9krpm, so i fitted a Hotter BR8ES plug and this has now sorted things right out.
you can get servos for them, the 3bn still has the bracket on the frame, found even just slotting to back off the powervalve a bit is actually quite a large compromise on top end power
iv got a broken 3 wire servo on mine rare as ya like sooner or later ill get a 5 wired servo moror an stip an swap the parts round an see if that works
i think its just the motor burnt out so i plan on keeping the pcb an wiring getting another servo an stripping out the rotary motor and soldiering it in to the 3 wired servo's body... its worth a try iv looked through the posts an cant find it done previously but its only a possitive an negative to a motor i cant see why it cant be done .
sounds logical to me fella, pretty much what i was thinking, replace just the motor itself with one from a 5wire model, and keep the wiring from a 3wire.
