Smoke from the front end

[placidfemme]

I've just gone and searched through all my previous threads because I'm sure I've mentioned this issue before... but I can't seem to find anything... so here goes...

~~

As you all know I ride a '92 Kawasaki ZXR250C. I've had the bike for about 2-2.5 years now.

Before I wrote the ZXR off (Dec 2005) I started to notice white smoke coming from the front end.

Its only noticable in the dark (with the headlight on of-course). I first started noticing it in the mornings when I used to start work at 6.30am. You could see the smoke wafting up infront of the light and also wafting up the inside of the fairings past the instruments, sometimes a lot of smoke and sometimes just a little bit.

Then I started working late and noticed the smoke when I would get home at about 9pm.

Recently I havn't been riding much in the dark, but since I've started my second job and I finish at 9pm, its obviously dark, and last night again I noticed the smoke when I got home, I called Sam out and pointed it out to her, so I know its not just in my head.

Now pre-2005 I took the ZXR into Red Baron twice to get them to try and find what is causing the smoke. Both times Mike (the head mechanic at the time) couldn't find anything that he thought would cause the smoke. He said to just not worry about it.

Since then the bike has been written off, re-complied & registered, passed 2 WOF's and had a service or two, and none of those things have stopped the smoke.

These are the things I considered:

1. Possible fork oil leak somewhere thats leaking onto something hot causing smoke? -- Had the fork seals and oil replaced when before the bike was re-complied & registered & WOF'd. So can't be that.
2. Leaking brake fluid from the front break somehow? -- I've been keeping an eye on my front break fluid levels. It hasn't dropped significantly over the last few months, so unless a small amount like say... 1 drop can make a fair bit of smoke, then I doubt its the break fluid.
3. Radiator -- I've checked over the radiator and it doesn't seem to have any cracks/holes in it, so I don't think radiator coolant is dripping onto the header pipes to cause the smoke...

So I'm at a loss. The smoke smells kinda sweet if that makes sense. I don't think its affecting the performance of the bike, and I'm also unsure if it smokes all the time as I can only see it in the dark...

But whether or not its affecting the performance or safety of the bike, it shouldn't be smoking.

Can anyone suggest what else to look at/for to figure this out?

Thanks in advance

PF

[SARGE]

I've just gone and searched through all my previous threads because I'm sure I've mentioned this issue before... but I can't seem to find anything... so here goes...

park your bike over a piece of cardboard after a run.. note where the drips are in the morning ..

if it smells sweet .. could be coolant leaking on headers etc ..

[imdying]

I've seen some really badly leaking forks on a ZXR250, even they weren't enough to coat the headers... you'd know anyway, your brakes would be covered in it.

Brake fluid burns with a white smoke, but you'd know if you were losing that.

Your brakes aren't binding? They'll smoke the pads if they get too hot, but I'd like to think you'd notice that too!

Any plastic on the headers? Either a fairing rubbing, a bag that has gotten caught, etc?

Sarge's trick will work fine for looking for leaks

[placidfemme]

park your bike over a piece of cardboard after a run.. note where the drips are in the morning ..

if it smells sweet .. could be coolant leaking on headers etc ..

I'll try that tonight, but I don't think there are any "drips" from the bike, when I noticed the smoke last night I ran my hands voer everything I could reach (and that wouldn't burn me) to feel for anything wet or damp and didn't find anything. But I'll give it a shot.

I'm planning on giving the bike a good ole clean on Sunday if the weather ain't too bad, and I'll double check the radiator for cracks/holes etc

[bistard]

Sarge is on to it,maybe even remove the bellypan
One question I have is,is it smoke or steam??
Smoke will linger in a cloud,steam will dissapate quickly??

[SARGE]

I'll try that tonight, but I don't think there are any "drips" from the bike, when I noticed the smoke last night I ran my hands voer everything I could reach (and that wouldn't burn me) to feel for anything wet or damp and didn't find anything. But I'll give it a shot.

I'm planning on giving the bike a good ole clean on Sunday if the weather ain't too bad, and I'll double check the radiator for cracks/holes etc

when you are cleaning it .. check loose hose clamps, overflow lines, etc.. might py to remove the plastics to check everything over ..

[placidfemme]

I've seen some really badly leaking forks on a ZXR250, even they weren't enough to coat the headers... you'd know anyway, your brakes would be covered in it.

Brake fluid burns with a white smoke, but you'd know if you were losing that.

Your brakes aren't binding? They'll smoke the pads if they get too hot, but I'd like to think you'd notice that too!

Any plastic on the headers? Either a fairing rubbing, a bag that has gotten caught, etc?

Sarge's trick will work fine for looking for leaks

As mentioned the fork seals and oil where replaced recently (about Nov last year... around abouts anyway), so I really doubt its that, also last night I felt around my forks and there was nothing oily there...

My front brake has felt "soft" lately, but it still works fine.

My front disc's and pads are new too (only had them replaced when re-complied... so again last year in about Oct/Nov) The brakes squeak a little bit sometimes, but only when braking hard.

*runs downstairs to check that my fairings arn't touching the headers and theres no plastic in there*

[placidfemme]

Sarge is on to it,maybe even remove the bellypan
One question I have is,is it smoke or steam??
Smoke will linger in a cloud,steam will dissapate quickly??

I'm pretty sure its smoke. Last night it seemed to hang around for a bit before disappearing. But in the past its varied... sometimes it wafts around for a bit other times its barely noticable etc

when you are cleaning it .. check loose hose clamps, overflow lines, etc.. might py to remove the plastics to check everything over ..

Sweet as I'll try that too

[MSTRS:Me]

.... I can only see it in the dark...

You are eating too many carrots??

Seriously, I remember that thread vaguely....think it was coming out of your front hub, around the speedo drive??

[placidfemme]

You are eating too many carrots??

Seriously, I remember that thread vaguely....think it was coming out of your front hub, around the speedo drive??

lol I hate carrots

Yeah I thought I had posted about it before... I'll double check

Edit: Here it is:

http://www.kiwibiker.co.nz/forums/sh...from+the+front

[Roj]

Could be a small amount of oil leaking from the cam cover seal, if it drips on to the exhaust you would get the smoke once things are hot. a very small leak would not show up easily.

[vifferman]

Where does your strange oil filler vent pipe go to? It's not coming from that is it (fumes wandering up underneath the tank and out)?

See if you can sniff up some of the smoke and taste it - is it oily, burny, plasticky, greenhouse-gassy, or what?
Maybe your bike actually had a previous life in the facory where they make the smoke that's put inside electrical components. That could be really handy, because if any of us had leaks in our electrical components and the smoke got out, instead of having to buy new ones, we could just get them refilled from your ZXR.

[xwhatsit]

Could be a small amount of oil leaking from the cam cover seal, if it drips on to the exhaust you would get the smoke once things are hot. a very small leak would not show up easily.

This is what mine was doing. You're right, despite the quantity of oil, it was actually quite difficult to discover where it was coming from without a lot of testing. Ended up replacing seals that didn't need replacing.

[Macktheknife]

Check your headers for stains or leak marks and back track from there. Smoke generally means a heat source, work at it backwards and see what you find.

[placidfemme]

Well my oil overflow pipe (or whatever its called) come out under the bike near the left side riders footpeg. The petrol overflow pipe (at least I think thats what it is) and the coolant overflow pipe come out near the right rider footpeg.

The smoke is not coming from under the bike but the front end. So I don't think it's the overflow pipes dripping on anything. And even if they were dripping, they are no-where near anything that gets hot... the worst I can see happening if any of those pipes are dripping overflow luquid is that it'll drip right onto the patch my rear tyre will go over (when moving). So nothing to cause smoke there.

I just went through and re-read the whole thread posted above that I did in 2005 asking about the same problem.. wow I've learnt a lot since then... anywho... the only thing from that thread that I havn't done/checked is taking the brake calipers or whatever apart and checking for brake fluid leaks...