Charging system issues

[pompousporcup...]

To go along with my current woes getting the gpz900r running right i have found that the sodding bike tends to die slowly but surely.

Messing around trying to get the idle to stay at 1k i turned all the lights on and noticed the idle speed drop. Once the lights were on i raised the idle back to 1k and it seems to idle completely fine now.. if i turn the lights off the idle rises very slightly..
if i set the idle with no lights on and THEN turn the lights on, the idle drops to the point it struggles to run.

What is likely the issue here?

[jaffa90]

Have you a multimeter to test the battery voltage when switching on/off
the lights, also the battery voltage the morning after before switching on anything and when switching on and at 4/5000rpm??????

[pompousporcup...]

i do a multi-meter have which i will run at the bike with this evening.

Not being a fan of electrics by any means (i should get more involved really)

[groovylee]

easiest scenario - battery is on its way out, just need to replace it.

slightly harder - Reg/Rec on its way out - also need to replace it

pain in the arse - something with the generator. not played woith that side of things myself, but i'd be betting on it being one of the first two, most likely the battery.

get busy with the multi meter - test battery when not running, and when running, and then post the results up, that will hopefully get your answer
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Past - 1988 honda revere 600, 1996 kawasaki gpz500s, 1999 Yamaha R6

Current - 2002 Aprilia RSV1000R & 1999 Kawasaki ZX6R

[pompousporcup...]

the battery is brand new. Its one of those yellow motobatt gels ones.

Voltage on the battery reads 12.4 or so when off and goes up to 13.5 or so with the engine running at 4k. This is correct as far as the manual is concerned.

Wierdly i ran the bike, turn off the lights and the revs didnt change.. seems like the charging system is fine at the moment. What isn't fine right now is the fuelling which is proving to be a constant mind fuck trying to get 34mm cvks to run on pods..

[redeem ouzzer]

It's not unusual for the idle to dip when the lights are on. Just set it to hold idle when warm with lights on.
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Be a REAL MAN!

[RhynoCZ]

[pompousporcup...]

good to know, thats what i've done and it looks to be working I will do that in future to avoid this but at least i know the charging system is fine

Now to check the resistance of the coils, ht lead and end caps to rule those out.. still have a stumble under 4k rpm.

Just ordered an little ultrasonic cleaner to get the jets good and clear as its possible i have a fuel issue, rather than ignition/spark. After 4k rpm it seems to pick up and rev freely.

[RhynoCZ]

[pompousporcup...]

[RhynoCZ]

[jjdugen]

Good luck getting it to carburate with pod filters. Seriously, try the original air box. IF you insist on pods, I would look for some bell mouths to go onto the carb mouth and fit the pods to them, room permitting. Pods are crap, repeat after me, pods are crap!
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The CBR900RR has been sold. Aprilia Falco worms its way into my heart.
Try Soi 23 on Amazon for a good read.... Self promotion? Moi?

[pompousporcup...]

the reason for pods is due to the extremely tight clearance when removing and replacing the carbs. Its a ridiculous design. The carb-airbox rubbers go hard over time making it pretty much impossible. I could buy new ones but then i'm buying a new filter and clamps etc etc. The cost, given what ive spent already, ends up spiralling.

The ones i am using are these:

https://i.ebayimg.com/thumbs/images/g/BWsAAOSwT~9WlMMg/s-l225.jpg


They're not the generic badly fitting, metal capped pods Peeps on the gpz forum have had them running with these without issue so i believe there is a way

[RhynoCZ]

Oh Yes, I do remember my struggle with the GPz airbox on the 550. No matter what engine you had, if it was made in the 80's and said GPz on the side cover, it was a pain in the arse to remove the airbox and put it back in. I rember I had to remove the rear mud guard to get a few milimeters of space to actually pull the carburetors off.

The airbox being the only reason why many riders with GPz400/550/750/1100 and GPZ750/900 used pod filters. I did a fair bit of experimenting, even tried open intake for awhile, but I got back to the airbox in the end as that worked the best, weatherproof.
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'87 Honda XBR 500, '96 Kawasaki ZX7R P1, '90 Honda CB-1, '88 Kawasaki GPz550, MZ 150 ETZ
'95 Mercedes-Benz w202 C200 CGI, '98 Mercedes-Benz w210 E200 Kompressor