So, since I put my 907ie back on the road I've been clocking up quite a few miles. Stops, starts, handles and goes perfectly. However it stopped charging the other day. I've checked all the obvious stuff and suspect the problem to be the regulator .. but before I look for a new one I thought it a good idea to check the stator. Does anyone know the correct resistance value of the stator windings when measured from the yellow connections ... in Ohms? Thanks in advance ... Mike
Hey, I don’t know the stator resistance but do a simple check of the reg/ rec by testing the diodes across the yellow wires and if they’re dead you know where you’re going
The stator windings will read very low, less than about 2Ω across the 2 yellow wires. You can also check that there is infinite resistance between any of the 2 wires and earth. With the engine running expect to see about 15-20Vac across the 2 wires per 1000 rpm, so about 30-40Vac at 2,000 rpm. I fitted a shindengen FH020AA mosfet regulator to mine. Just connected the 2 yellow wire to 2 of the AC inputs leaving nothing on the other input. I found that it wouldn't fit in place of the OEM regulator so had to mount it on the outside of the alloy plate and shorten a couple of the fins to clear the indicator wires, although if I'd fitted it turned through 90º with the connectors to the rear that might not have been necessary. You lose the charge warning light but that's no big deal.
