Kawasaki gpz1000rx .

[JimO]

Well theres alot of food for thought there , the strangest thing is it fixes itself after 10-20 minutes lol , then may not return for a week or 3 . but i,ll look at all your points , i,ve just being out there with crc , cleaning elect connects , filling up battery levels etc they were up and down abit , a couple by a inch ,?

new battery should not be loosing fluid

[Taz]

GPZ900's sometimes did this after being parked in the rain or washed when on the side stand. Water could find it's way into the r/h sparkplug tunnel and cause a short but once warm the moisture would evaporate and the bike would run fine. Just a thought.... A smear of silicone between the cap and the tappet cover can fix this problem.

[ladreborn]

Just being for a ride , higher speed stuff , not 50kph , and guess what , yep , started to misfire etc , the horse power its got , lets it be hideen at higher speeds with revs up , but it was there , i,ve got it in garage , i,ll look at plugs . i for sometime thought it was only happening riding to work , 50kph ,

[Max Preload]

GPZ900's sometimes did this after being parked in the rain or washed when on the side stand. Water could find it's way into the r/h sparkplug tunnel and cause a short but once warm the moisture would evaporate and the bike would run fine. Just a thought.... A smear of silicone between the cap and the tappet cover can fix this problem.

I'm pretty sure toysky garages his GPz1000RX. He's had the plugs out - I'm sure he would have noticed water in the suppressor caps.

But the point is nonetheless valid - many 4 cylinder DOHC engines suffer this problem with water (particularly with aftermarket suppressor caps) if left on the sidestand in the rain. Even oil can do it - I've had that happen to me. My GPz600R many years ago also did it.

[Max Preload]

New battery... and you're adding water to it?

Have you checked the output of the alternator? How many volts across the battery terminals at 4000rpm?

[ladreborn]

Idonn,t have the gear to measure this , could this be part of prob then ?

[ladreborn]

yes , bike is garaged , but if at work , it sits outside ,

[Max Preload]

yes , bike is garaged , but if at work , it sits outside ,

Are the supressor caps the originals i.e. is there a molded piece that fits snuggly over the spark plug tube over the rocker cover to prevent the ingress of water?

[Max Preload]

Idonn,t have the gear to measure this , could this be part of prob then ?

It's possible, but not likely. However, as said before, you shouldn't need to add water to a battery very often, and certainly not a new one.

[JimO]

my Z1R had aftermarket supresser caps that caused it to fart about if used for around town riding and this went away when they were replaced

[BM-GS]

If I recall (the memory gets fuzzy) Kawas of this vintage were prone to carb-icing. If it only happens at low-revs, but it clears at full-throttle, when the engine and weather are cold (especially cold & damp) you'll probably have this problem.

There were assorted fixes to do with routing coolant around the carbs (to warm the intake charge, stop the icing & reduce power, so check that these are there and functioning.

I had a Yamaha RD350 which did that - it didn't half make winter roundabouts entertaining... Running fine, cough, splutter, slow, more gas...both pots at 6000 rpm, ice, big truck...!

[roadracingoldfart]

I still lean towards a fuel problem . Either dirt or water. As its winter we have a problem with dew forming inside the tank from the cold mornings even in a garage and as we aslo all know , water aint no good as a fuel.
My first plan of attack would be to drain the tank and carbs and refill with fresh gas to see if it still continues. While the tank is empty get a good look into it however you can to look for any signs of rust grit etc. Check the fuel you drain out carefully (empty it into a clean catch container) for water and if you do find it you will have to have a really good clean out of the fuel system including the filter. Any water will look like a small puddle of clear globules at the bottom as water is heavier than fuel. Its amazing how many bikes rust out the tank on the left hand side because of the side stand and when i was working on bikes for a living it was a real headache, especially on farm bikes and such.
I hope this helps you out.
Cheers Paul.

[Max Preload]

Its amazing how many bikes rust out the tank on the left hand side because of the side stand and when i was working on bikes for a living it was a real headache, especially on farm bikes and such.

Yeah - my NS400R rusted a hole in the tank in that manner - I saw the rust stain begin just after I bought it (of course).

[T.W.R]

A new battery shouldn't loose a substantial amount of acid quickly. The type of battery the RX has is filled at the shop prior to a sale. And to add, even if the battery levels are low once the engine is running it is of little consequence and wont have an effect on an intermittent misfire.

If the carbs have been off recently, was the problem occurring before they were removed & checked or after? And were they set-up properly when they were refitted?

A quick fix for moisture in the fuel tank is a cup of Meths, but this wont get rid of any droplets in the carb itself. They'll have to be removed and cleaned out properly.

[ladreborn]

Well it played up after my higher speed run yesterday , and in the past it has come right by itself , sitting overnite or even sitting for 30minutes last week , -------------------this time it has not . running like a hairy mutt , on 3 , hmmmmm ., i,ll check out some of your thoughts .