Air filter - what to do?

[bishboy]

When I was changing the tank on the R1 last week, I thought I'd have a look inside the lovely fabricated airbox and imagine my surprise when I discovered that there was no air filter and one of the throttle cables is held in place with a zip tie

Refer exhibits 1 thru 4 below:

The throttle cable will be easy enough, just remove the zip tie and use a nut as per the top throttle cable, but that necessitate removing the throttle cable to to slide the nut on

In regards to an air filter, I imagine I would need one just to keep dust etc out of the carbys and possible modify one to fit over the front of the airbox, but which one to use?
Would be easier to put a filter on each of the carby trumpets?

Any thoughts......

[mick_dundee]

Yeah, tohughts are get an air filter..

[Rossi]

Where's the ram air box .................oooh no, wait...........s'not a Kwakka

[IsleofNinja]

Hmmmmm ... Well you have yourself a little problem alright Andy

I should imagine a set of K & N or UNI type pod filters would not fit under the airbox lid - how much room above the trumpets do you have to play with?

Bearing in mind you would really want the dearer units with the integral ram tube

Acoustic foam makes pretty good racing air filter media ie from Vehicle upholsterers / audio suppliers . . Must be oiled and serviced like dirt squirter filters obviously..Having the throttle and I assume choke cables run through the gauze / airbox mouth presents sealing issues obviously re a front mounted filter (although something is better than nothing ).
Being a trackie , the thin 10mm stuff should be fine.



not sure how you would secure it thought ??

[hoffy]

Yamaha's....yes they are wierd

seriously, I would get an air filter asap, but if she's still running good, Id say no harm done. Race bikes run no filter.

[timmyrocks]

dude if its a race bike dont worry, more air the better. i have an open carb setup on my 400 and its sweet. esp if its been tuned to run like that, then putting a filter may cause so dramas.

and it looks like the cable thats tied is the return cable??? if so you can do without it anyways as your return springs on your butterflys on the carbs are strong enough to return the throttle, just make shore your opening cables nice and smooth.

[IsleofNinja]

How'd you go Andy??

Any joy?

[bishboy]

Went with no filter at the last track day and proceeded to bin it So at moment focused on fixing it first then worry about sorting out a filter.

[Tack]

I wouldn't recommend using a filter on each trumpet. While it will do the job of stopping dirt from going into the engine it isn't that good for keeping the air /fuel ratios correct. All the air bleeds are still open to dirt but, while that may not be such a problem, it is the fact that as the filters get dirty and reduce flow into the engine the air bleeds are not affected. This means that the air/fuel ratio will change as the fliters get dirt.

Filter fitted to each trumpet will change the tune anyway so you probably would need a dyno anyway.

Plus there is good arguement for having good air flow around the trumpets especially the lips where different shapes/lengths can cause irregular flow patterns.

We used to see the same thing happen to rally cars that ran twin Weber DCOE or IDA carburetors (or delortoes). The dust would clog the filters and the car would lose power. A road bike wouldn't suffer as badly, obviously, but it would still be a problem for the two reasons mentioned above.