logic behind the inlet air screen

Started by numroe, Oct 05 2007 03:49 AM
17 replies to this topic

  • numroe

Posted 05 October 2007 - 03:49 AM

#1


I know the air screen has been discussed before. But usually with regard to power. Here I question the filtering logic behind it.

OK, sure it can stop 1/8" stones, but sand can still go through it. What's worse is if sand does fall through it while removing a dirty filter, then there is no easy way to see it and/or wipe the inside of the airbox out. Does anyone relate to where I am coming from?

Please explain. eg. purpose of screen when riding and when doing filter maint. :confused:

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  • Steve47

Posted 05 October 2007 - 04:25 AM

#2

This screen is not intended to be a filter! It's there in case the bike back fires to make sure your air filter doesn't catch on fire!!

  • numroe

Posted 05 October 2007 - 04:32 AM

#3

Steve47 said:

This screen is not intended to be a filter! It's there in case the bike back fires to make sure your air filter doesn't catch on fire!!

Ah-ha. I see. :applause: A 4 stroke thing. Like those pops when it's not kick started properly? I've only had that (an intake backfire) happen a couple of times. I suppose an over tight valve/cam clearance could do it too. How often do air filters catch on fire? $hit that'd suck when you're out in the sticks somewhere.

  • Steve47

Posted 05 October 2007 - 07:39 AM

#4

It will not happen if you leave that screen in there!

  • Dirty917

Posted 19 October 2007 - 03:33 PM

#5

Good question...what do you do if you know some sand or fine dirt fell through the backfire screen?

  • MCL

Posted 19 October 2007 - 03:54 PM

#6

Take the whole airbox apart and clean it.

  • er193

Posted 19 October 2007 - 07:14 PM

#7

Use a shop-vac

  • Darkkyn

Posted 19 October 2007 - 08:29 PM

#8

i taje the sub frame + air box off and blow it out with compressed air... only takes like 10 minutes.

  • rhinoracin

Posted 21 October 2007 - 08:44 PM

#9

Is there such a thing as fireproof air filter oil? if there is, you wouldnt have to run a backfire screen

  • teamgreen

Posted 22 October 2007 - 08:48 AM

#10

I think it's Twin-Air that has a kit that eliminates the screeen and uses Flame-Resitant Foam-n-Oil.

I run No-Toil filters and Oil (No screen).

  • Thomas6x

Posted 22 October 2007 - 04:04 PM

#11

teamgreen said:

I think it's Twin-Air that has a kit that eliminates the screeen and uses Flame-Resitant Foam-n-Oil.

I run No-Toil filters and Oil (No screen).

What kimd of riding do you do? And can you feel the diff.

  • mx_racer1009

Posted 22 October 2007 - 05:35 PM

#12

i race the in the pro class in california and the mechanics and i have removed the screen on all 4 of my bikes and it has a very noticible diff but not in power more in throttle response and i use very little oil on my bikes due to restriction of air and durring my motos i have the bike so hot and run it so rich that i shoot flames out the rear when i let off and never have i heard of from any of my race buddys about having our filters catch fire but maybe under diff riding styles things work diff...

  • Open_Class

Posted 22 October 2007 - 07:46 PM

#13

Buddy of mine burnt up his CRF. Had to throw about 5 gallons of sand on it to stop it.

It happens.

  • numroe

Posted 23 October 2007 - 07:36 PM

#14

Open_Class said:

Buddy of mine burnt up his CRF. Had to throw about 5 gallons of sand on it to stop it. It happens.

This is like a classic insurance dilemma. Can I afford to lose my bike? Maybe. Can I afford to get sued big time for starting a bush fire? No way. So unless that fire resistant filter oil is really good, my screen will have to stay in.

  • Open_Class

Posted 24 October 2007 - 09:01 AM

#15

I have ridden bike with and without and felt no difference. I do not know anyone on the local level that can ride a stock 450 to it's potential, so any perceived gain from cutting out the screen is a crock in my opinion.

Don't be pissed people, but really!!! Get a better breathing filter, leave the screen in and don't run the risk. Loose 5 lbs. and you will be better off.

This ones worth .10

-OC

  • justarider

Posted 26 October 2007 - 10:21 PM

#16

I think the screen actually does several things.
1. It keeps large rocks out of the engine.
2. It prevents a backfire from starting the air filter on fire.
3. It helps prevents a backfire from blowing holes in or ripping the air filter.

  • Open_Class

Posted 26 October 2007 - 10:28 PM

#17

more importantly, it does not:

1. rob horse power

  • mx317

Posted 28 October 2007 - 05:10 AM

#18

I wish the screen was made on the filter cage like many other bikes. That way if some dirt fell in the air boot you could see it and get it out.



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