supermoto running power

[jim-cr 250]

Hi all, just a quick question, im currently building a cr with a crm engine in, and its getting ready to be put on the road and in for its mot, just wanting to put a horn on it, however i have found a few live feeds with the bike running and they are only showing 2.65 volts, with the multimetre ( however this mulitimetre has been playing up and may be faulty), but even when revved up and wired up to the horn, it only makes the horn vibrate and not even produce any noise, unless you put your ear right up against it, (the horn is brand new 12v one, ive tried testing it on a good battery and its fine, so that should rule out the horn and any adjustment).

So i was just wondering how you get your horn to work with no battery, just the magneto, which is just the standered crm one.I would of thought it would produce enough power to make the horn work? been looking around and ive seen you can buy 6volt ones, do you think this is what i would need?
Any help would be super
Many Thanks
Jim

[Ariel Badger]

Use on of these..
https://cgi.ebay.co.uk/10-Bulb-Horn-BRAND-NEW-handlebar-bracket-included_W0QQitemZ350217614809QQcmdZViewItemQQptZUK_SportGoods_CyclAcces_RL?hash=item518a98b5d9&_trksid=p3286.c0.m14&_trkparms=65%3A1%7C66%3A2%7C39%3A1%7C293%3A1%7C294%3A50

If the MOT guy is stroppy he may demand a horn that sounds a continual note so buy one of these.
https://cgi.ebay.co.uk/Thunder-Horn-Bicycle-Bike-Electronic-Beeper-bike-mount_W0QQitemZ130319098498QQcmdZViewItemQQptZUK_SportsLeisure_Cycling_Bike_Lights?hash=item1e579fa282&_trksid=p3286.c0.m14&_trkparms=65%3A1%7C66%3A2%7C39%3A1%7C293%3A1%7C294%3A50
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[jim-cr 250]

[G]

If everything else works, by far the easiest way if you're not sure about the wiring will be to just stick a small battery in the bike and run it from that

[Ariel Badger]

[jim-cr 250]

ahright cool, bit easier then, think il just put a small scooter battery in the airbox for the mot, then leave it out, doubt if i got stopped id be asked to sound my horn?

Thanks again
Jim