Any Electron Scientists out there?
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Thread: Any Electron Scientists out there?

  1. #1
    Senior Member methamphetasaur's Avatar
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    Any Electron Scientists out there?

    So last year I decided to "modify" my Honda MB5 from the stock look to more of a bobber/cafe racer type thing because you know, why not ruin a perfectly good motorcycle?

    What I really managed to do though was modify it into a pile of motorcycle. But now I've decided to re modify my pile of motorcycle into a fully functioning motorcycle again. I feel like it'll be more fun this way. Who can say, though?

    Well anyway it looks like among my several modifications, I modified the battery box into the trash or something. I looked at trying to make a new one or just shoving the battery where it will fit somewhere else. Despite the fact that it is quite small, it doesn't really fit anywhere else. So I've decided to modify that into the trash as well.

    The problem with that plan is my minimal understanding of electrons and their modus operandi. The battery is a tiny little 12 volt with a 2.5 amp hour rating. I know a few of you have replaced the battery on the TW with capacitors, so my question to you is: do any of you know what size/rating capacitor would I need to replace a 2.5 AH battery? That bike has no starter or turn signals and the battery's only real job is to keep the headlight bright when the engine is at idle.
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  2. #2
    Senior Member SportsterDoc's Avatar
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    A 55 watt (incandescent) headlight draws 4.36 amps at 12.6 volts or 3.99 amps at 13.8 volts.

    The 2.5 amp hour battery should power a 55 watt headlight for about 1/2 hour.

    I do not know the farad/microfarad rating of this capacitor, but its seems to fit your inquiry

    https://www.holley.com/products/mari...s/parts/151308
    methamphetasaur likes this.
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  3. #3
    Super Moderator Purple's Avatar
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    have you considered the Nuclear option ? ......
    (Warning - Forum may contain nuts) ...... Hidden Content

    TW200 - 1998 - Japanese import - 7000 miles on the clock - TW225 Special Edition 2007
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  5. #4
    Senior Member methamphetasaur's Avatar
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    Thanks.

    I found that kit on Amazon, and in the reviews some people are saying that it works well on bikes with magnetos like old Harleys, but doesn't work with DC electrical systems. While I don't necessarily think that they're lying, I can't think of any reason why not. It seems the internet is flush with conflicting information on the topic, so I really have no idea what to think. But I've never been one for understanding the theoretical side of things, so I ordered one anyway and I suppose I can figure out how to make it work somehow. How hard can it be, right?

  6. #5
    Senior Member methamphetasaur's Avatar
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    Quote Originally Posted by Purple View Post
    have you considered the Nuclear option ? ......
    As in replacing it with a nuclear power plant? Because that sounds tempting, but I feel like the weight might be a bit much...

  7. #6
    Super Moderator Purple's Avatar
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    Well, for less adventurous among us, I would suggest searching "battery eliminator" as a starting point - seems a lot simpler I'll admit .....
    (Warning - Forum may contain nuts) ...... Hidden Content

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  8. #7
    Senior Member SportsterDoc's Avatar
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    Batteries were required on motorcycles back in 60s or 70s (in California) so that a stalled bike would still have a taillight.
    A TW may have a voltage challenge at idle, so that an incandescent headlight may dim.
    To compare battery capacity with a capacitor, both need to be converted to joules.

    However, voltage drop on a capacitor is so quick, it is not a fair comparison.

    I think you'd be better off with a very small battery.
    Lithium Ion is small and light, but is expensive, has issues with cold weather starting (not a concern for your bike) and charging voltage is critical.
    I'd look for a very small AGM battery...preferably vacuum filled.
    They are lighter than lead-acid, no liquid to leak, can be deeper cycled without harm, etc.
    Last edited by SportsterDoc; 06-22-2019 at 11:24 AM.
    2014 Honda CB1100
    2018 Yamaha XT250
    2016 Moto Guzzi V7 II
    2017 Yamaha TW200
    2012 Triumph Bonneville
    2002 H-D Sportster 1200 Sport
    2003 H-D Sportster 883
    1976 Honda CB750F
    1975 Honda CB360
    1970 Yamaha CT1
    1972 Yamaha CT2
    1972 Yamaha AT2/CT2
    1970 Honda SL350
    1970 Honda CL350
    1967 Honda CL160
    1967 Honda CB160
    1962 Honda CA110

  9. #8
    Senior Member methamphetasaur's Avatar
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    The battery on that bike is already very small. Smaller than most 6 volt batteries. You're not going to be able to find much smaller.

    s-l400 (1).jpg

    The problem is I got rid of most of this. No more oil tank, oil pump, air filter box, or battery box. The problem now is putting the battery there is "ugly".

    received_623299431511149.jpeg

    It's similar to this now.

    moped-army-b3f71e07efd1c5cca24e5e7cb66b1b6f.jpg

    I realise getting rid of the battery may not be the "best" choice, but for better or worse that's what's going to happen.

    This thing only does like 45 on a good day, and I've never ridden it at night or in poor weather, so the lights being dim are not too big of a concern. It's more of a toy than any serious mode of transportation.

    I was just wondering really if there was any kind of minimum specification I should look for that you guys knew of before I go off buying things.

  10. #9
    Senior Member ToolmanJohn's Avatar
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    I vote for a flux capacitor install. It will then be the fastest and slowest Honda MB5 ever, simultaneously.
    methamphetasaur likes this.
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  11. #10
    Senior Member methamphetasaur's Avatar
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    A flux capacitor would be a waste of money unfortunately, so a regular one will have to do. The only way that thing is ever going to get to 88 mph is in the back of a truck. Not my truck though. My truck won't go that fast either.
    ToolmanJohn and CJ7Pilot like this.

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