Z1OwnersClub GB

Hi Guys

I need some advice. I have decided to remove the airbox fom my Z1000st and fit conical filters. No problem with this but what do I do with the breather pipe.

Ta Mick

It shouldn't blow out much oil, so you can either fit a small K&N type filter, or route a pipe to waste between the swingarm & rear of engine, or stuff it in a cool waste bottle...

If it does mist oil a bit, why not route the pipe to the drive chain

Mick if you are going to put aftermarket filters on... the drop down ones (oval when viewed from rear) work better. The original airbox gives the best and most stable reservoir of available air and the conical filters suffer from turbulence round the rear of the cylinder block if your spanking it.

You may end up causing yourself trouble with jetting from mild to frustrating depending on how close your existing set up is to the optimal stoichiometric ratio at this point.

Those after market filters are also louder on induction roar too so if its a sedate ride on a Sunday afternoon your after you may have it spoilt by the impression that someone is following you and glued to your rear number plate.

The oil in your engine is fairly acidic and corrosive when old and contains hard particles of carbon, and quite a lot of water etc so thought needs to be given to where you route the open end of the pipe. The original setup i believe was designed to lubricate the throttle slides and bodies though this rational is questionable in light of the previous sentence.

Based on what i've seen coming out of mine i would not route it to my £90 630 'O' ring chain but vent to atmosphere seemed to work for me.

You will find that (and these engines suffer from this) the pipe clogs a little with emulsified oil. Cold condensation is the cause and this can lead to whitish yellow jelly being fired onto the chain or rear tyre or paintwork etc. depending where you vent it.

I have just put the airbox back on mine cos i really cant be bothered with all the fuss and am going to let the engine re-cycle the fumes as was originally intended.

Good luck with your decision



AL