ZX 9 still running rough.

[yorkie_chris]

Don't soak the floats in carb cleaner and be careful of rubber parts

Thanks for the heads up.

[Bibio]

Originally Posted by SV650Racer

Sounds like the pilot jets are still blocked or the emmulsion tubes are worn.

check your plugs to see what condition they are in. put a fresh set of plugs in and if all is well then starts to run rough again then it's the emulsion tubes/needles are worn.

How can I tell if the needles / emulsion tubes are worn?

[Sid Squid]

Take the diapragms and slides out of the carbs and examine the needles carefully, there will undoubtedly be some polished areas on them, but if they're visibly worn you should be able to see it. The tubes should be perfectly round but if there's wear there will ovaling on the side of the tube toward the engine. Unless it has high mileage or if Dynojet needles, (otherwise known as "carburettor files"), have been fitted, the the symptoms you're describing wouldn't make me suspect these parts initially.

[yorkie_chris]

I don't think the zx9 was one of the worst culprits for emulsion tube gouging, they cause a boggy slobbery rich feeling as a transitional thing when coming up from idle to midrange if worn.

Mine pulls like a train as soon as you give it more than 1/10 throttle but for cruising around at 30mph and even 40mph it's a joke. Going to pick up some washers to shim the needles and may even get a +4 ignition advancer as well depending on funds but only after the essentials have been done and it's running smooth, or at least as smooth as a 9 can low down.

Forgot to mention. It's the E1 I've got which apparently has pretty sensitive carbs.

[yorkie_chris]

Is it surging at all? That's generally a strong sign of lean running like blocked pilot circuits.

Ultrasonic clean the carbs? Not too expensive or if they can be separated I will do it for a fiver.

I find with a good cleaning solution the ultrasonic cleans really well, it is in fact why I bought my unit, set time temp and timer, go have a tea and come back to clean carbs, blow through with air and at least you know youve got everything.


Also good for engine parts before you put them in an engine..

Anyway, maybe ask the guys at redmonkey?

Originally Posted by yorkie_chris

Is it surging at all? That's generally a strong sign of lean running like blocked pilot circuits.

I think surging is probably the best way to describe it. It's like riding a kangeroo. But if I then blip the throttle, it revs up fine but then it will dip down below normal idle speed before returning to 1000 - 1400rpm. (Yes, the idle is that rough)