MZ ETZ251 battery + wiring

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MZ ETZ251 battery + wiring

Postby alexxx » Mon Apr 03, 2017 3:41 pm

HI,
Just got an MZ ETZ251, opened the battery case to find a couple of extra wires that I am not sure about.
The main battery leads are easy to id but the other two (black/red and black/blue)..no idea what they should be connected to, any thoughts?
Can the 1991/92 MZ ETZ251 be started without a battery? it is the 12 volt version with (I think) electronic ignition

Thanks

MZ ETZ251 battery area.jpg
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Re: MZ ETZ251 battery + wiring

Postby Blurredman » Tue Apr 04, 2017 7:18 am

Those two wires should go to the indicator relay..

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1972 MZ ES250/2 - 16,000 miles - The project! :)
1979 Suzuki TS185ER - 9,000 miles - Mud :)
1981 Honda CX500B - 91,000 miles - Long Distance :)
1987 MZ ETZ300 - 38,000 miles - Sun :)
1990 MZ ETZ251 - 49,000 miles - Commute :)

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Re: MZ ETZ251 battery + wiring

Postby alexxx » Tue Apr 04, 2017 10:14 am

Thanks, now I know I need to buy a flasher relay.
Do you know if these bikes should have a 9Ah battery.

Regards,
Alex
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Re: MZ ETZ251 battery + wiring

Postby Skorpion » Tue Apr 04, 2017 1:04 pm

Hi alexxx,

The ETZ 251-301 came with a 5.5Ah battery.

The ETZ 250-300 came with a 9Ah battery.

I'm sure I've heard that a 9Ah battery will fit into a 251 you will just need to check the dimensions .
Last edited by Skorpion on Wed Apr 05, 2017 1:04 pm, edited 1 time in total.
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Re: MZ ETZ251 battery + wiring

Postby alexxx » Tue Apr 04, 2017 3:10 pm

Thanks to everyone for such useful information
great wiring diagram too.
I wonder why the later bikes had a smaller Amp hour rating, the trend is usually for more.
Will it be ok to use a larger Ah battery? just thinking of old japanese bike where the indicators and lights would dim so much at tickover and at night..virtually nothing but a dim headlight at tickover.
Never had an MZ before so not sure what to expect.
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Re: MZ ETZ251 battery + wiring

Postby DAVID THOMPSON » Tue Apr 04, 2017 6:37 pm

did you mean an A not a V
Dave 2002 MZ RT125+1995 Saxon Tour(500cc)
1997 MZ 660 Traveller+6/13/09 WV USA
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of everything"
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Re: MZ ETZ251 battery + wiring

Postby Blurredman » Wed Apr 05, 2017 3:20 am

I use an 9ah battery in my '90 251. It fits, physically in the provided space and although the headlamp dims a little at idle, it's no way near as bad as a magneto system. It's noticable, but not dangerous.
1972 MZ ES250/2 - 16,000 miles - The project! :)
1979 Suzuki TS185ER - 9,000 miles - Mud :)
1981 Honda CX500B - 91,000 miles - Long Distance :)
1987 MZ ETZ300 - 38,000 miles - Sun :)
1990 MZ ETZ251 - 49,000 miles - Commute :)

ftp://blurredmanswebsite.ddns.net/Vehicle_Documents/MZ_Documents/
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Re: MZ ETZ251 battery + wiring

Postby alexxx » Wed Apr 05, 2017 5:21 am

Thanks to all.
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Location: Edinburgh Scotland


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