fitted a new battery today. a good quality bosch one and it fired up lovely ticked over smoothly and the idle was nice and low. found another problem though the system seemed to be a total loss system and the battery was flat when i got home after about an hours worther or riding, i did have to putmy lights on but thats when i noticed the bike start to stutter as if it had no battery? not sure whether this is the regulator or thwe generator? any suggestions???
thanks david

If the bike started stuttering as soon as you put the lights on then there must be a serious short in the lighting circuit somewhere. You *should* be able to run for about 30 minutes on sidelights or about 10 minutes on headlights if the battery isn't charging.

generator is fucked I reckon.. Have a look at it, and get the multimeter out adn test it - I;d guess a phase has died and so you don't get proper charging

i got a feeling its a short since the lights were on for about 3 minutes while the bike was running before it started to stuttle and bog. im not sure about the generator il have a search around for a short if i can find anything il check the generator. also could the regulator have anything to do with it? since i fitted a cbr one not to long ago????

but like you say CMSMJ1 it could well be the generator/alternator... im going to change the regulator to for a new one since im going to the trouble offinding the problem.

if the genny cannot provide enough power to run the bike then the battery starts to go flat. You turn the lights on..it starts to go flat and then dies..

Chekc the genny..


And..why swap the reg rec? Was it dead? Did the genny get checked then?

I think it is the generator it's not a short circuit I don't think since everything is operational. Just a quick question about rick Oliver's Gsxr alternator conversion. Does the kit come with the alternator aswell as the flywheel/housing.
Thanks david

£200 is a lot of money mind so it's just an option.

Thinking of getting my alternator re wired/conditioned

Why not start at the alternator and work through the charging system. With rect/reg disconnected, check stator resistance yellow to yellow wires 1-2 ohms, yellow wires to chassis infinite resistance. With rect/reg disconnected measure AC voltage between yellow wires, should be 50 volts at 5000 rpm.

If alternator tests ok then suspect rect/reg.

Sounds good! Planning on getting it all checked out on Friday or Saturday... Also I heard there is two different size alternators of the nc30 models anyone have any idea what size is in the 1989 model??? I heard one has a 102mm outer diameter? Please correct me if I'am wrong

go on the electrex website and they have a brilliant idiots guide to checking the charging system

http://www.electrexworld.co.uk/acatalog ... G-&-RR.pdf