Battery eliminator?

[daveg]

Hi - I am thinking of fitting a battery eliminator to my RD350 to get rid of the heavy battery as it is used for racing only. I have seen a few adverts on ebay and stuff, but does anyone know, if a battery eliminator is a simple capacitor fitted or is there more trickery in these boxes that they sell on ebay for $50, you can get quite a large capacitor for peanuts....

Anyone made one or fitted one??

[Norbo]

You dont need a battery to run a bike its only for the lights . I have a 250lc race bike that runs with only a stator cdi and the ht coil thats it no loom they all just plug in to eash other and i dont have a battery .

So dont wast your money save it and get something that will make the bike faster .

[daveg]

Hi Norbo, thanks but can you go into any more detail - would you have a circuit diagram??

[mogster]

my power valve track bike is the same , cdi box , coils and a kill switch , norbo is right they all plug in together , put in ypvs wiring diagram into google and you'll get there , i did and i know jacksh*t about wiring or electrics . my power valves are fixed open as well so no need for battery or wiring loom

[daveg]

Hi - can you give me a good site. I took an hour this morning to research this on the web and didn't come up with much. I would really like to keep the power valves functioning aswell.

[Norbo]

You dont need a diagram mate . Its like puting in a plug in the wall socket for the TV 3 pins 1 holl in wall .

The plugson the stator /cdi & Ht coul just plug in to each other thats it. All you have to do is put in a kill switch for race regs .

[daveg]

OK I will take a look physically on the bike, although in this case you won't get an powevervalve, temperature gauge, neutral light (It is useful even if racing)!

[Dirtbag]

Would you really be saving that much weight ?.....couldnt you just fit a smaller lighter gel battery ?...............it would save messing about with wiring

[daveg]

Yes you are right, but a capacitor is even lighter if it works....

[Norbo]

People that race lock the valve open and use a capilory temp gauge, There is allways a trade bloke who seels them ther are about £25

[daveg]

Had a look under the tank today to see if I could fathom the suggested method.... Well coming from the stator you have 3 white and one blue wire which goes to a connector near the battery, according to you guys I should plus this into the CDI? I couldn't find a like connector on the CDI unit.... Do I have to have the regulator/rectifier in the cicuit somewhere?

[Deleted]

the rectifier is used to help charge the battery and therefore will not be needed in you attempted conversion.
i note that you want to use a capacitor, if so with out the battery how will you charge it? once empty (discharged during use) its useless without recharging it.
the best bet is to use a smaller gel battery as mentioned above.

[daveg]

The Capacitor would replace the battery and be charged by the regulator/rectifier - this is option 1.
Option 2 is trying to do as Norbo suggests above and remove all the charging circuitry and just have the generator directly going into the CDI, driving the coils. The disadvantage of option 2 is no 12 volts to power either the power valves or the temperature guage.
And after looking yesterday if doesn't seem obvious to me what should plug in where.... The advantage of option 1 is you keep 12 volts whilst the bike is running to power both the power valve plus anything else, although you don't lose as much weight. Has anyone on here tried the "capacitor" option?

[daveg]

So I spent this weekend investigating the wiring on the bike (31K). And I now understand that the CDI/Ignition coils, get their power directly from a seperate coil on the stator, and hence are not part of the charging circuit. And so in theory I should simply be able to remove the regulator/rectifier and battery and the ignition should carry on working (maybe I need to bypass the ignition swith?), the only question I have is in the workshop manual, it says if you disconnect the battery from the circuit, the stator coils (or maybe the rectifier/regulater will be damaged. Is it OK to disconnect both the battery and reg/rectifier, and see what's missing....Sorry about these questions.....