60's 250 narrow case help.

[lentmatt]

Hello all, Im looking for help wiring my 65(?) narrow case scrambler I recently purchased. Im getting this wee gem ready for my oldest to take his road test on for his 16th birthday (Sept 4). There is 3 wires coming out of the engine case left side 1 red 1 yellow and 1 white. The only ID I can find is DM250 on the outside and 0603.49.330 to the left of the flywheel inside the case. There is no regulator on the bike now but i plan on putting a 6v regulator on. The bike runs without the battery but the wiring needs a facelift.....help

[lentmatt]

I guess I have 2 questions.
1: The 3 wires coming out. What are they specifically by color?
2: Where do I find my serial # on the narrow case engine?

[4theloveofducati]

[markk900]

Engine number on the case behind the cylinder - as 4thelove said, one half of the case is the model, in the exact same spot on the other case is the engine serial number.

For actual VIN its a bit different: if the bike was originally US imported, the VIN was stamped by the importer (Berliner) on the silver tag on the headstock, and for convenience it was usually the same as the engine number. For the rest of the world, the VIN was stamped on the frame tube near the battery tray, and was usually quite different than the engine number.

Since the numbers don't really correspond to anything in particular, you can get reproduction silver tags and stamp the engine number on it yourself and you should be good for registration (if that's what you want to do).

As far as the wiring, the early scrambler didn't use a regulator I believe - according to the manual I have up to engine # 92171 there were three wires (sorry no color codes in the manual) - one went to the positive side of the coil, the other two went to a junction block attached to the lights (looks like a black wire to the taillight/bypass switch and a blue to headlight switch, but I could be wrong). Later engines had a battery and a diode to rectify current but no regulator I can see - wiring was yellow to coil, red to the light switch, and white to the diode which I assume was the rectifier.

Hope this helps! BTW - I think the system was designed as AC so no need for a regulator - if you have the earlier alternator it only puts out 40W, and the later one only 28W, so unlikely to blow anything! You could I suppose get a later Monza alternator and put it in with a full regulator system but not sure if you want/need it.


Mark

[lentmatt]

Thanks a million for the help. Should go a long way. Cheers

[markk900]

One correction - 4thelove was also correct with the engine number *in front* of the cylinder not behind....I'm getting dyslexic in my old age.....

[4theloveofducati]