mystery tubes

[Jonesy :-)]

Ram air........bloody genius

[Tim]

new use for the mystery tubes
 
after much thinking and tinkering heres how it ended

crank case breather tube  rerouted up and out the rear of the bike  similar too aussi xs's

this left me with a empty inlet point on the front of the airbox so i had a scrounge round at work and came up with the following ingredients

    1 length of heat resistant tubing  red
   
    1 Y peice  tube spliter   

 so i've taken red tube plugged into airbox breather plugran over the motor   inserted   Y spliter piece   then ran tube to under front fairing   with a few mini filters along the 2 intake  nozzles   thus giving me a ram air intake type set up   with   the biggest plus being the bike dosn't smell oily any more   

[makzy]

Hey Tim if you use a breather from a 4x4 gearbox or diff on the end of a long tube routed up high this will allow the engine cases to breath and any oil that condenses in the tube will run back into the engine. PS these breathers must point upwards, works very well.

[pgnz]

Ditched that emission junk on mine years back, doubt you're gonna save the planet with it like some will claim,  hehe,  always a gooey soapy oily mess in there, it's just pushing hot oily crankcase air back into the carb intakes, surely hot air into carbs = less oxygen / weaker combustion,  more fuel consumption, less power...

[Jonesy :-)]

Hey Tim
just curious as to why you're giving the original breather system the flick?

[Eveready1100]

Just one thing for you to check before you do too much. Have a look at the inside of the breather tube when you first pull it off the airbox spigot, particularly just after a ride. If it's very wet with oily residue, that means the motor's a bit fumy (or a lot), and will quickly clog up whatever filter you put on the end of it, or go a proper catch bottle. You'll be surprised how much oil can be blown out that tube over time.

[Tim]

thanks for all the great info   
 in terminating  , I dont mean block off the breather  just meant  rerouting   as in  AussiXS11.s   pic   thats the plan il go with 

[AussiXS11G]

hey Tim....... try something like this - or a catch bottle



of course - having done this - block the inlet into the air box - and you could remove the mystery tubes.... as I have

[excess.11]

Hi Tim......to terminate do you mean block it off?
I would advise to use either an in line fuel filter or piece of suitable foam over the end to allow the crankcase to breathe...otherwise you ll be weeping oil via engine seals due to the build up of pressure.

[Eveready1100]

terminate crank breather tube

Just wondering what you're planning to do with it?
You can't just simply block it off, as the crankcases would pressurise and you'd suddenly have oil leaks where you didn't have them before.
It's a very effective system that on a stock bike would be best left as designed.

[Tim]

exelent  information  Jonesy  and EV   

next question    so in effect  the  crank case breather  pushes hot expanded air back through intakes  ,so if I was to terminate crank breather tube  would there be any ill effects  other than the enginge running a little cooler

thanks
Tim

[Jonesy :-)]

thanks Ev, your reply more detailed than mine

[Eveready1100]

Hi Tim, I'm thinking that you may be feeling 2 of the 4 tubes that curl around the front of the velocity stacks. They originate at a plastic box at the front side of the airbox which is fed from the front side by the single large breather tube from the crankcase vent.


 ^ Here's a shot of the box with the velocity stacks pulled forward to give a better view


 ^ from another angle

There are two small thin tubes right at the top of the airbox that attach to the carb breather tees, but these are right at the top so not much chance you'd get your fingers that far up.


 ^ A close up of one of the bowl vent breather tubes that sit right at the top of the airbox


 ^ Shows the outside front of the airbox with the large spigot in the centre, that the crankcase breather tube attaches to. The two smaller black ones are for the carb breathers.

Nice work, Paul! I was just about to go looking for that diagram.

[Jonesy :-)]

Hey Tim
is it the tubes No: 30? in this drawing
I think the carby fuel bowl vents and the crankcase breather go into them and then recycled into the combustion air

[Tim]

hi all  as the title suggests im after some info its carb / air box related scoured the manuels  and forums  to no avil

 ive found a random fuel leak carb 1   draining through the air filter  and puddling on the motor  first guess stuck float or dity neddle and seat

on opening up said air box  and having a feel  round the internals  im greeted by  2 tubes that terminate in the rubber boot exiting from the air filter to the carby

  can anyone explain the function, and point of origin of said tube  i cant find any  mention of them any where in the manuel

thanks 
Tim