Revs

[Flip]

When I rev my bike (ZXR4), as the revs die down it's to around 2K-2K and idles there for a about 5 seconds before settling at 1500. The throttle cable doesn't seem to be sticking.

(Don't know if this is linked to the fact my top end needs work or not?)

Any ideas?

[Scotsman37]

The recommended idle speed after a bike that has had time to fully warm up say after 20-30 minutes of being ridden is usually 1300 +/- 50 rpm for a Kawasaki 550, but 1100 +/- 50 rpm for a Kawasaki 750.

Do you have a Haynes manual?

[Flip]

My bike is happy at 15 - 16.

But when the revs die down it sticks at 2,000 rpm for about 5 secs then drops to normal revs each time I rev it. Why?

[Scotsman37]

Have you tried a cable oiler device with some WD40 to see if there's any rust in th cable itself?

[BlueNinja]

Heya flip

I have a ZXR4, and it had similar problems. Got a ratchet and some sockets? whip that tank up, take the air filter box off, and pop your finger down each of the carb chokes, and lift the needle slide up, then take your finger out and allow the slide to drop. Do this on each of the carbs, and if one of them moves very easily, and falls back faster then the others your looking at a split diaphragm in the carb. These are pricey, but il give you an address to get them much cheaper.

Hope that helps, its all I can thing of that would cause a problem like that. Youl probably notice flat spots in the power at higher revs if that is the cause

[Flip]

Scotsman. Will give the cable a squirt just in case.

Blueninja. I'll be taking the tank in a day or two anyway, so I'll take a look then.

Thanks fellas

[Scotsman37]

Further note: If you haven't got a Haynes manual for your bike there's one for download on eMule and just search on the name "ZXR 400", but there's a bit of a queue for it and so you may have to wait a while......

[Flip]

Got a cd manual from Yams I think it was.

But thanks for the thought.

[Silver]

I had the same problem with my ZXR750. Turned out to be a combination of bungs and a few other bits that needs replacing. Sorry I can't be more specific, I can't remember

[Flip]

So the top end plus this... Sounds expensive Hopefully when I get them done, the engine will be sweet.

Is this plus a noisy top end likely to cause a breakdown?

[Whitetrash]

give your carbs a really good clean, paying particular attention to the faces at which the slide and housing meet, srings and cables etc. also ZXR400 suffer loads of carb trouble in cold weather. hope this helps
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