Honda-SOHC

Came across phils post which prompted me to try and give an understanding of the generator I sell.

I use the winding and moffset reg/rectifier that is also sold by electrex in their race alternator kit.  The advantage is that the rotor is very small, which gives very low crankshaft inertia, no flywheel effect. ideal for us racers.

there is always a compromise though,  the magnets in the rotor rotate past the stationary winding, to generate electricity, basically the faster the magnets pass the winding the more electricity is created, but because the rotor/magnets are on a very small dia, it means they pass the windings at a much slower speed for a given rpm. compared to a normal motorcycle generator alternator.  (ie inside of a wheel rotates slower than the outside)

this is ok on my race bikes as I am not sitting about much and the bike is sat at high rpm most of the time, 

and it works really well as the bike has no starter either,  so does not drain the battery starting.

My big mistake was re-designing the special cover to allow use of starter motor,  I have found that people think they ride their cafe racers on the road and think they will not be using lights and because they ride fast they will be revving high a lot of the time.

But I think the reality is that when you use the starter to fire up the bike you tend to use a lot of the battery capacity, and so putting back the charge used will need a good high rpm run without interuption to replenish charge.

for example, I had a customer bike fitted with my latest kit, with starter etc and my low profile cover and generator,  I have been setting suspension and been bedding brakes in and doing runs between villages before handing over build, and I have found that general pottering about with squirts up dual cariageways etc stopping to fill with fuel etc just was'nt enough. the bike cruised along lovely, but generally speaking probably half the time it was running below the 3500 rpm minimum needed to put some charge back etc.

the bike would always start on kickstart, but the electric start would begin to struggle.

Its not the reg/rectifier that causes this,   and the race reg/rectifier will not be suitable for a std honda system either.

hope this helps,   the covers are expensive to make and coupled with the rest of the kit its a big spend,  but saves that hole in the side of fairing, and saves you clouting the ground with the stock engine cover.

www.good-bits.co.uk

cb750 specialist

I use the supplied gasket with the 836 kits from weiseco,  they all have the small hole which is a pain. I machine up a punch to recut the holes in a fly press.

works ok, but just time consuming.

Andy
www.good-bits.co.uk

more likely a dodgy float valve, you cant always free them with a tap with a spanner.

andy

Hi,

always a problem this one,   how far a compromise to make???

I've been through all this myself,  if you keep starter you need the great big flywheel and stator, which means cutting a hole in fairing to allow engine case to stick out, then you keep grinding through it going around corners, plus you need a decent sized battery to start it.

but if thats the way you want to go it can just about be done .  I ran a starter in our first seasons racing, although very quickly removed it all.

You should just about get a cbr1000 late model battery under seat hump, this battery is a good rating for its size. and will start bike

use a replacement rectifier/reg pack instead of the old contraption, its easier to tuck away, and the starter solenoid can also just about about be put under seat too. remember to use a decent size cable to supply starter, and from solenoid to battery, this is harder to hide but a little perseverence and little black cable ties etc.

a couple of customers of mine have been fairly successful with these little lithium ion batterys, they are light as a feather and tiny, one chap fitted one under swing arm near swing arm pivot, and another in a tray under seat. but I am not wholly convinced of them just yet, as i have seen some fail to maintain their ability over short time, but this could be due to lack of use, so i am still to be convinced.

any question contact me

andy

https://youtu.be/cOcQZ2oVeFE

www.good-bits.co.uk

shame i missed this,

could have really have helped you, I now know what works and what does'nt,  did some great stuff last year with my cr with rob wittey in the saddle won crmc championships.

www.good-bits.co.uk

https://youtu.be/cOcQZ2oVeFE

if you need futher help, i am based in sussex, just go on site and get details there.

andy

Hi,

If you need any advice /assistance.

please dont hesitate to call, been developing a race winning cr for ages,

see https://youtu.be/cOcQZ2oVeFE.   for video of "Award winning Honda 750 Cove Torque"

and my website www.good-bits.co.uk

advice for free, and hopefully i can help with your build

andy

Hi

www.good-bits.co.uk,   not london area, but 5minutes away from hassocks station on the mainline london-brighton railway.

Honda's a speciality, as well as classics / racing/ cafe builds.    in august we are doing an open workshop scheme where you bring your bike in for a quick check over and update service. but slots are getting short now.

always pleased to help,

info@good-bits.co.uk