[ca412686]

Hey, I noticed a few people had some holes drilled in the sides of their airbox for motard/street use? Just wondering if this is a common mod and if it actually flows a bit better air????

 

[siam]

more holes = more air . But the bad part is from hopping up cars is too much holes and placed in the wrong place can cause turbulence.. just don't go too wild with that hole saw.

 

[ca412686]

Ya, sounds like a easy way to flow more air. Is there any specific places or patterns people use to cut the holes? Thanks

 

[ca412686]

Anyone? I've seen alot of pics with a "L" shape pattern on the sides....

 

[ronwest99]

On a dyno, we found that this made almost 2 hp for the ktms (12, 1" holes).

 

[Muzzard]

Like this? The airbox has opposed holes that match, and the left cover is straight through to the cleaner. I have a slip in inserts for both sides that go inside the airbox for cosmetic and air pre-clean purposes that is oiled 1/4" foam that are used for long dirt road rides or offroad. I noticed a considerable difference when out on the road at high RPM cruising. (8500-9500 RPM)

 

[ronwest99]

yup, perfect. Nice cow motif btw.

Spent some more time on the dyno last night and found that with the engine work done to my bike the stock air filter/airbox is a big restriction. Now I've got to design something around it.

 

[ca412686]

Just what i was looking for! Thanks!

 

[Muzzard]

If you are seeking big HP from your 5 valve, look there and how they are timed. Without divulging too much, did you know here in Australia we run speedway sidecars using methanol fed FZR 1000 engines and run the timing 180 degrees out?... :headscrat... My motard develops 44HP on pump gas! Oh, its a 250 too...

 

[ca412686]

Well now you're going to have to tell me more!! :infrandom

 

[Muzzard]

I will try to get an instruction list together and PM you with the finer detail. Having said that, Until it is really developed I'm trying to keep prying eyes out of my shed, several manufacturers have already tried to look at the engine, one of which originally made it. Team Honda here only get 38HP out of their CRF 250 used at top level motocross.

 

[husky450]

Muzzard,

Know where that cow pattern bodywork is from? i NEED that

 

[Muzzard]

Muzzard,

Know where that cow pattern bodywork is from? i NEED that

The cow printed decals are custom made here in Australia by Ringmaster Images, to my design/idea. Any custom decal manufacturer Stateside would be able to help you. I do sets for DRZ that look look tigers, and KTM sets that look obviously, like a leopard.... Its a real head turner here let me assure you!.. :laughingr My mate was trying to milk the footpeg, until I told him it was its penis!

 

[husky450]

Too funny!

Tell ya what, if you started importing those animal graphics here, you'd probably do well.

 

[ca412686]

Like this? The airbox has opposed holes that match, and the left cover is straight through to the cleaner. I have a slip in inserts for both sides that go inside the airbox for cosmetic and air pre-clean purposes that is oiled 1/4" foam that are used for long dirt road rides or offroad. I noticed a considerable difference when out on the road at high RPM cruising. (8500-9500 RPM)

How much did you change your jetting from stock???

 

[bentring]

What do you have to do to get that kinda horsepower out of a 250?

 

[WR 450 Sm]

Here is a airbox mod from Holland, it works great if you do a complete job.

1: Other exhaust system
2: bigger main jet
3: Dyno run

49,9 Hp @ the rear

 

[tecdady]

Anyone used these?

http://www.motoworldracing.com/White-Bro-Filter-Air-Box-Vents.html

seems like the same thing that everyone else is doing, but a bit easier and maybe cleaner. also, i have a fmf pipe and my 450 runs great, but if i cut the airbox should i be expecting to have to rejet?