Help Understanding stator test results.

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Davidsquaredson
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Thu May 09, 2019 2:56 am

Hey,
My scooters headlight is not as bright as it should be at idle (1300 rpm). Picks up with rpm. Bulb is good. Bgm 120w stator and bgm flywheel.

White earth to mag housing: 0.4 ohms
White to green: 504
White to red: 112

Do I interpret that as I need to clean my stator ground wire up?

Sticky says they should be:
- less than 0.1
- 450-540
- 90-120

Tx
David

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1974 Rally 200
1965 Li150
1963 TV175
1974 Eibar Jet200

Meds1
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Thu May 09, 2019 6:58 am

The answer to that is maybe.
Cleaning up connections is always a good idea.
0.4 ohms might be down to your meter not being zero’d properly

Unless your running dc the dim-bright with RPM is normal

What’s more likely to be causing the issue is poor earths in the headset and from the engine to the frame.

Davidsquaredson
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Main scooter: Early Eibar Jet 200
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Fri May 10, 2019 1:52 am

Meds1 wrote:The answer to that is maybe.
Cleaning up connections is always a good idea.
0.4 ohms might be down to your meter not being zero’d properly

Unless your running dc the dim-bright with RPM is normal

What’s more likely to be causing the issue is poor earths in the headset and from the engine to the frame.
Thanks! Tonight's job is connection cleaning.

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carpe scooter diem

1974 Rally 200
1965 Li150
1963 TV175
1974 Eibar Jet200

mick1
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Fri May 10, 2019 7:24 am

run a separate earth from the engine to the headset/headlight......... eliminates quite a few possible problems

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Monty
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Sat May 11, 2019 1:39 pm

Personally I don't have a separate earth from the engine, the frame is the earth but I do tend to daisy chain things like cdi mount, regulator rear light and always have a good one on the headlight. what you are describing is normal an AC system, (a stator with a 120W output No such thing IMO) and most regulators are rated at 80W anyway. If you don't want flicker go DC with a battery then fit LEDs for as much as you can. worth looking at the contacts on the back of the bulb or bending them in a bit, a dab of extra solder on the 2 contacts of the bulb often helps

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Monty
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Sat May 11, 2019 1:42 pm

sorry meant to add the stator measurements are for the coils for the ignition so as long as it runs will not change the light output.

warts
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Mon May 13, 2019 10:40 am

If you have one of these in a drill, https://www.amazon.co.uk/BQLZR-Shape-Br ... iy&sr=1-19 you may have one already. Push it into the threaded hole - very quickly the brush becomes pointy and neatly cleans all crap - oxides, rust and paint away from around the thread. Only takes a few seconds. Only costs a few bob.
Get some dielectric grease to smear lightly on all the contacts. I just use copaslip, but supposedly the dielectric is better.

I have done it like this for years so my car, garden equipment or bikes don't have this sort of problems (ooh errr!) but I come across lots of other people's that do and need doing.

dirtyhandslopez
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Sun May 19, 2019 2:32 am

Just to throw this out there...
Is the magnetism good in the BGM flywheel? I only ask as I did a comparison between an indian flywheel and a BGM flywheel and the Indian flywheel won hands down. Using a spark plug gap tester, the indian flywheel put out a lot bigger spark also. Stands to reason if the magnetism is low in your BGM flywheel, the lights will be poor at idle.
That's not going anywhere...

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