Backfire screen removal?

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2/28/2014 1:35 PM

I've been hearing that a lot of people remove the screens from their air filter cages to gain more HP. I heard it works but bikes catch fire occasionally. First off, has anybody tried it? And will I have to re-map my bike? I have a 2012 crf250r.

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2/28/2014 1:40 PM
Edited Date/Time: 2/28/2014 1:44 PM

oh air filter cage... I thought you meant a possible exhaust screen. Don't remove that

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"What happens to your hands when you crash?"
"I put my hands up real quick to protect my sunglasses"

2/28/2014 1:43 PM

enketchum wrote:

oh air filter cage... I thought you meant a possible exhaust screen. Don't remove that

Will it could lead to the rear fender catching fire and the whole bike possibly, but it starts with the filter catching fire. You will need to use a fire proof filter/oil. TwinAir sells them along with other companies.

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-streets-

2/28/2014 1:46 PM

Removing the screen does nothing for HP.

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2/28/2014 2:07 PM

MotoX85 wrote:

Removing the screen does nothing for HP.

Uh are you sure about that man? I think alot of guys would disagree with you. Me being one of them. Mitch Payton might be another. Airflow = horsepower!

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2/28/2014 2:19 PM

MotoX85 wrote:

Removing the screen does nothing for HP.

jhansen510 wrote:

Uh are you sure about that man? I think alot of guys would disagree with you. Me being one of them. Mitch Payton might be another. Airflow = horsepower!

have you done it?

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2/28/2014 2:33 PM

Sounds like the risk is not worth the small reward.....

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2/28/2014 2:50 PM

Done it on every bike since 2004, before even riding it.

Airflow does equal horsepower, or at least throttle response.

Honda makes it super easy because there are a few metal tabs that you bend and pop it out. Kawi and Suz are a bit harder.

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2/28/2014 2:56 PM

mtl wrote:

Done it on every bike since 2004, before even riding it.

Airflow does equal horsepower, or at least throttle response.

Honda makes it super easy because there are a few metal tabs that you bend and pop it out. Kawi and Suz are a bit harder.

have you had any problems wit it being removed? and will I need to re-map the bike?

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2/28/2014 3:10 PM

Run the right filter and oil and you'll be fine. What else is done to the bike?

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2/28/2014 3:15 PM

Internal combustion engine is an AIRPUMP.
More air in/out =HP.
Did to carbed 06 CRF250. Yes it made a NOTICEABLE difference.

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2/28/2014 3:15 PM

i do this to ever mx bike, knock on wood , never had a problem. no toil, twin air make good kits rmz you can use a rm cage screen. the crf is rather simple, the kawy more difficult as stated above. , probably not much more power, but it will breathe better. risk/reward really up to the owner.

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2/28/2014 3:20 PM

jhansen510 wrote:

Run the right filter and oil and you'll be fine. What else is done to the bike?

It's bone stock. Can I keep stock mapping you think?

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2/28/2014 3:21 PM

mxb2 wrote:

i do this to ever mx bike, knock on wood , never had a problem. no toil, twin air make good kits rmz you can use a rm cage screen. the crf is rather simple, the kawy more difficult as stated above. , probably not much more power, but it will breathe better. risk/reward really up to the owner.

Did you remap your bikes or keep stock settings?

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2/28/2014 3:23 PM

The No-toil CRF kit is cheap insurance & what I have on my 2012..............

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2/28/2014 3:23 PM

Humble opinion, jetted mine up after removal.
Mapping slighly richer, I'm sure you'll notice it.
Simple, more air requires more fuel as I've found out

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2/28/2014 3:26 PM

mxb2 wrote:

i do this to ever mx bike, knock on wood , never had a problem. no toil, twin air make good kits rmz you can use a rm cage screen. the crf is rather simple, the kawy more difficult as stated above. , probably not much more power, but it will breathe better. risk/reward really up to the owner.

garrettcibak71 wrote:

Did you remap your bikes or keep stock settings?

sorry, cant give u an answer, my bikes have aftermarket pipes and are remapped anyway.a remap is worth the $$ , my opinion a remap is way better than the screen removal, but more $$$

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2/28/2014 3:30 PM

Tracktor wrote:

The No-toil CRF kit is cheap insurance & what I have on my 2012..............

Did you remap the bike?

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2/28/2014 3:42 PM
Edited Date/Time: 2/28/2014 3:53 PM

Well I actually have removed my screen, only to replace it after just one ride.

2006CRF450

This won't help you out any, but I'm home sick and bored so...

I can't say if removing the screen changed the personality (as in HP increase or a change in the power delivery) of the bike in any way shape or form.unsure
Is it even possible to detect a 1/4 or 1/2 horse power gain in a 450? Not in my world.

In my case though...who frickin' cares? I have not EVER been able to use all the available power on tap as it is,

I have owned several 4 strokes in my day, stock and modified, and none of them had a "backfire" screen.
The possibility of your bike going up in flames is real, but personally, I would not let that dictate my decision to de-screen the air filter. But that's just me.

Good luck with your 250.

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2/28/2014 3:50 PM

comments on this subject from a person or persons that only ride mini 2 strokes dont know shit about 250fs and 450fs

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2/28/2014 3:59 PM

jhansen510 wrote:

Uh are you sure about that man? I think alot of guys would disagree with you. Me being one of them. Mitch Payton might be another. Airflow = horsepower!

If the engine does not need more air it will not equate to more horsepower. I do not think removing the screen is worth the 200 bucks for the kit. I removed the screens in my 09 Kawi's and saw no difference. A throttle body is 43mm give or take, the size of the air filter opening is not restricted enough by the screen to matter.

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Tomac and/or Anderson for 2020.....

2/28/2014 4:08 PM
Edited Date/Time: 2/28/2014 4:09 PM

Have done this to every 4 stroke I've had. It DOES make a difference. As far as remapping, you don't have to its not a big deal. But I would recommend remapping, it will make the bike run a lot better.

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2/28/2014 4:12 PM

2013 CRF 250 reporting in. To everyone who says it will catch on fire, it wont. It MAY leave singe marks. I took mine out as soon as I bought the bike, and it hasnt caught fire yet. I use PJ1 filter oil.

The throttle body will only allow a certain amount of air through, like previously stated, so the max HP wont change, but how quickly it gets there will.

As far as I can tell (I rode the bike a few times with the screen), it just makes the power a little bit snappy-er. IMO, take it out, the filter wont catch fire and it helps power A LITTLE.

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2/28/2014 4:18 PM

racer369 wrote:

comments on this subject from a person or persons that only ride mini 2 strokes dont know shit about 250fs and 450fs

Well what's your say on this? Remap it or no?

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2/28/2014 4:19 PM

moto38 wrote:

2013 CRF 250 reporting in. To everyone who says it will catch on fire, it wont. It MAY leave singe marks. I took mine out as soon as I bought the bike, and it hasnt caught fire yet. I use PJ1 filter oil.

The throttle body will only allow a certain amount of air through, like previously stated, so the max HP wont change, but how quickly it gets there will.

As far as I can tell (I rode the bike a few times with the screen), it just makes the power a little bit snappy-er. IMO, take it out, the filter wont catch fire and it helps power A LITTLE.

Did you re-map it or keep stock settings?

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2/28/2014 4:24 PM

garrettcibak71 wrote:

Did you re-map it or keep stock settings?

It's certainly not going to burn the engine down if you do not remap. Pull the screen out and do a simple plug check.

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Tomac and/or Anderson for 2020.....

2/28/2014 4:25 PM

garrettcibak71 wrote:

Did you re-map it or keep stock settings?

I left it at stock settings, and so far as I can tell, its fine. I dont think such a small change will affect the mapping badly enough to warrant a re-map. I didnt notice any backfiring or difficulty starting after I took it out.

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2/28/2014 5:31 PM

You have something restrictive enough to catch dirt right in front of it, so I don't see the screen being removed making an improvement.

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2/28/2014 5:45 PM

I've had a filter catch on fire just starting a cold CRF450 engine. I leave the back-fire screens in nowadays.

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2/28/2014 5:50 PM

CamP wrote:

I've had a filter catch on fire just starting a cold CRF450 engine. I leave the back-fire screens in nowadays.

Do you think efi, carb bike is safer one or the other, some say the efi bikes are less likely to backfire, dunno really, i just stay withbwhat works. imo

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