Stator?

[Bill Seward]

Looks like the gremlins are still biting Godzilla..
The bike starts and runs fine. I noticed a drop in the volts at the voltmeter after a few miles. It would drop to 12.2, then back up to 14.0.. Got the machine home, and put a meter right to battery. By now the bike was warmed up fully. Only about a 12.7 volt charge.
I put a MOSFET R/R unit in about a year ago. I will admit it was a no-name Chinese replacement. Maybe that will turn out to be the problem.

I checked the output voltage of the statorat 2000 RPM - well over 60 Volts AC at all 3 terminal combinations. No sign of any problem with grounded coils. Infinite resistance between the 3 terminals and ground.

I tested the resistance between all 3 combinations of white wires, and got exactly 1.7 ohms between all combinations.

Any suggestions? My guess is that there is a defect in the regulator. The voltage dropped quickly after a cold start, way before the stator would have heated up.

 

[Miles Long]

Was the Mosfet intended to be an upgrade, or a replacement for a defective original?
If an upgrade, switch it back to the original, and see what happens.
Sure doesn't appear that the stator is at fault.
Cheers!

 

[blaxmax]

Try this one Bill, it is working perfectly on mine for the last year-good price too.
http://www.ebay.com/itm/201358295479?_trksid=p2057872.m2749.l2649&ssPageName=STRK:MEBIDX:IT

 

[thor_eyerdhal]

90% of time the R/R is guilty...

 

[MaxMidnight]

Would be worthwhile checking and cleaning the main earth on the frame and battery to frame and crankcase.

 

[Bill Seward]

I've got the regulator running directly to the battery. I rechecked the resistance in the stator and found it to be a bit less than I mentioned.. It was 1.2 ohms on all combinations of connectors. This makes me even more sure that the stator is OK. I just ordered the unit Blaxmax suggested..

 

[blaxmax]

I've got the regulator running directly to the battery. I rechecked the resistance in the stator and found it to be a bit less than I mentioned.. It was 1.2 ohms on all combinations of connectors. This makes me even more sure that the stator is OK. I just ordered the unit Blaxmax suggested..

Bill, I would suggest an inline 30amp fuse going to the battery.

 

[Bill Seward]

By directly to the battery, I meant through a fuse.. Did that over winter..

 

[rdbul]

Shindegen SH775 or Compufire SERIES style RRs are permanent solutions to these problems. They save stators by not shunting the over voltage back through the windings (unlike a MOSFET).

 

[Fire-medic]

]Shindegen SH775 or Compufire SERIES style RRs are permanent solutions to these problems. They save stators by not shunting the over voltage back through the windings (unlike a MOSFET).[/I]

Now that's useful info, come replacement time.