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Old 03-30-2013, 11:36 AM   #98
cretan inside
yns's Avatar
Joined: Dec 2009
Location: Crete, Greece
Oddometer: 61
For a week now I go to work with a damn 100cc Chinese moped bike... (at least I still have a job in Greece... )

Long story short: Bike 37.000 km, a couple of weeks ago it starts turning on with the 2nd or 3rd effort. Clock turns off and then on again and resets doing the check from the start. I buy a new battery. It lasted ~ 200km. After some beers last Friday I had to walk home. Day after I started the bike with the old battery (that still had some life) and brought it home. With motor running I measured a pathetic 10,4V at the terminals.

Today I opened the stator case. This is what I found:

Does it look fried to you? For sure I have seen worse...

Here's what I measured with stator plug disconnected from the R/R:

Continuity between the yellow stator wires (1-2, 1-3, 2-3)

- Engine off (battery connected)
All tree between 0.6 and 0.9 Ω

Continuity between the yellow stator wires and earth (engine casing)

- With battery disconnected:
Wire 1 - ground: 1.2 Ω
Wire 2 - ground: 1.3 Ω
Wire 3 - ground: 1.1 Ω

- With motor running (4.000 rpm):
Readings went crazy but sometimes they showed numbers from 2 to 3 (Ω or megaΩ? - it's a professional instrument but I guess I don't know how to use it and if I'm supposed to check for continuity with motor running)


- Motor running idle:
Wire 1 - 2: 27V~
Wire 1 - 3: 26V~
Wire 2 - 3: 25V~

- Motor running @ 4.000 rpm:
Wire 1 - 2: > 75 V~
Wire 1 - 3: > 80 V~
Wire 2 - 3: > 75 V~

Your opinion? Is it the stator or should I search for a rectifier?

yns screwed with this post 03-30-2013 at 12:21 PM Reason: Correction of last sentence "alternator" -> "rectifier"
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