air cleaner housing

[Little Scotty]

I am doing a wet and dry compression test next week-stay tuned

[Little Scotty]

dear blokes,thanku 4 all yr input.I am awarding Errol 1st prize,at first instance.I have to mark down those who concentrated on my mention of insects[they were found filtered].Jonesy, maybe u should place a square of foam in the hole[as i have done after 60,000ks unfiltered].thanx again 4 all yr replies.

[Jonesy]

the little hole was put there as a tell tale for flooded carby's.......least thats what mines been good at doing up until I fixed the problem

[HMC]

The percentage of air sucked through that hole would be greater on a "pound for pound" basis than for air coming through the filter as the resistance is lower. Given its location I would not worry about it and thank Yamaha its not a dirt bike. I saw an XT500 go from Maffra to just south of Alice Springs before it shot sheets of flame out the pipe and died a death of complete destruction due to the same problem. It was sucking air in between the carby and the pot and the hole was abrading that hard, it was growing in size as we went.   
I think I may just check my airbox again.
My mate reckons that on a "pound for pound" basis, Americans are the dumbest people in world. But he works for the ATO.

[Brian]

... any insects small enough to have gotten through that hole would just be sucked through the motor and spat out the exhaust, again without any real possibility of damage or excess wear.
...

Errol, You must have some real tough insects in Aus 'cos our UK insects would definitely be damaged 

[BrettS]

Yep

[Eveready1100]

Ok, things are still a bit vague regarding this question, so I'll try to clarify things a bit.
The airbox snorkel feeds fresh air into the centre of the filter where it is drawn through it to the outside of the filter, then into the still air chamber (main airbox body) where it then makes its way into the velocity stacks on the carby intakes.
Scotty, grab a scotchbrite and cut a small cylinder of it and jam it in the hole. Yes, it has been letting a small percentage of unfiltered air into your motor, but only a small percentage, compared to the total air volume that would be passed through the motor each minute while it's running.
    The main bits that could be affected are the piston rings, which could have accelerated wear if grit got between them and the cylinder walls. But, being such small opening, and facing upwards, the chances of you ingesting enough abrasive materials big enough to harm the engine will be negligible. any insects small enough to have gotten through that hole would just be sucked through the motor and spat out the exhaust, again without any real possibility of damage or excess wear.
Did that help??

[Jonesy]

team bundy 1  jonesy o

[melbxs]

Good few years left in that filter Errol. ;o)

[Eveready1100]

Here's a pic for reference sake.



(This is my SPARE filter box, not the one off my bike!)

[Jonesy]

I havent got bike in front of me at the moment but i thought you were right the first time steptoe, the hole on the dirty side of the filter, the inside surface

[steptoe]

Completely cocked that info up,,    the drain hole is actually in clean air space,,(after having a  bo-peep) go with the gauze still,,
and still run with the no damage to any part  bit

[steptoe]

mine has always been open for as long as I, 've owned mine,, 20 yrs now, some time ago I cut a piece  of green scotch  pad to fit into the small recess inside the hole, to stop bits coming in,,, it, s more a drain than than an air intake hole,, don, t plug it  off though

You, 'll have done no damage any where because the hole is outside the filter,,

Hope this has calmed your nerves

[Little Scotty]

Blokes,thanx 4 ur past help,and now,i need a definitive answer 2 this pls:the hole[est 6mm]at the bottom of my air cleaner housing on my [superior ]RH Sport has been open and unfiltered all the time I have owned the machine[4 plus years and approx 60,000ks].There was an amount of material inside the housing,on the filtered side and inside the filter,insects etc]What damage have I done{and where}?What % of air would have entered through the hole?Why was the hole open and unfiltered?thanx