Lumpy idle + electics = GRRRRR

[Claud 14.7 to 1]

When i put lights on, indicators, and brake light. Idle speed goes lumpy, and eventually engine will cut out. i have to open the throttle slightly., to keep it alive

When i turn off the electrics it is better. It seems to be worse once the engine it hot, ie ive been riding for a while.

i replace the reg/rec with a brand new Heavy duty unit, about 2 months ago.

I think the carbs need balancing anyway, but is it right that the electrics should make the problem even worse??? revs perfectly, arbeit a sloppy pick up sometimes, when the revs die down a bit. idle sucks.

cbr400 gullarm. Thank you!

ps anyone got any vacum gauges. Im in Potter Bar, Hertforshire...

[Guest]

Sounds like your tickover wants tweaking up a bit. It's quite normal - in fact it's a law of physics - for this to happen. When you switch anything on you're asking your generator to produce more electricity. It can't do this without taking some more power from the engine so it slows it down a little.

[Claud 14.7 to 1]

Ive already set it to 1500 rpm. More you say???

[Guest]

That sounds a bit high but I've no experience of the little screamers. Maybe the carbs need a balance?

[Claud 14.7 to 1]

Yer the carbs may need a balance, but when the elctrics go on, the problem is noticeably different... And it cuts ont eventually . The problem is worse when there is a high ammount of electrics on.

Battery charges fine, and starts with plenty fo juice.

Thanks for replys. More help appreciated.

[Guest]

The more electrical load you ask the generator for, the more it'll pull the revs down on the engine as it tries to supply it. Couple that with carbs that are out of synch, even by a little bit, and you're asking for the engine to cut out.


Clean the flaot bowls out, check the float height and then balance the carbs (I'm assuming your valve clearances are ok?).

[Claud 14.7 to 1]