Air box

[jones711]

I just bought a 01 Banshee. I noticed they put 28 or 29mm carbs on it with the duel k&n air filters on the back of them with no air box. Do I need to get stock carbs so I can run a airbox?????I know they make a air box some what for this set up but its open (no lid) and i dont want to spend a 100 bucks or over for one. I trail ride alot and go to the track, so getting into water and mud is going to be a problem.:ermm:

[methyman]

Stock air box will work with 28 or 29 mm carbs with no problems. They sell bigger boots to go over the bell of the carb to run bigger carbs with an air box.

[JOHNDOE83]

Air boxes arent that great, open filters are where its at, they got rid of the airbox for performance enhancement.

Unless you plan on getn your shee wet and muddy, If I had one I wouldnt do it...lol... but if you plan on getn wet, get the airbox, if your gonna stay dry, just clean the filters often, it will benefit the power band really well.

I run open filters on my 400ex for performance, I stay completly outa the wet spots.

[Hondamaster5505]

Originally posted by JOHNDOE83
Air boxes arent that great, open filters are where its at, they got rid of the airbox for performance enhancement.

Unless you plan on getn your shee wet and muddy, If I had one I wouldnt do it...lol... but if you plan on getn wet, get the airbox, if your gonna stay dry, just clean the filters often, it will benefit the power band really well.

I run open filters on my 400ex for performance, I stay completly outa the wet spots.

I kind of agree. I run an airbox, but no lid on it. The banshee needs the extra airflow.. I was amazed what removing the lid did to increase how well it breathed.

I slam puddles all the time if im in a "puddle" mood, and never once had an issue of getting to badly into the airbox. I've even ridden in the rain.

Just have a good, nice quality foam filter.

[hondamancbr03]

Originally posted by methyman
Stock air box will work with 28 or 29 mm carbs with no problems. They sell bigger boots to go over the bell of the carb to run bigger carbs with an air box.

LRD sold this set up you're talking about.....Alren (before selling LRD) was a firm believer in 28PWK's bored to 30 running in an air box with no lid. He tested air box open lid to K&N no air box and states that the air box set up puts out more HP due to the increasd air speed....Think of it as blowing through a hose 2" round and the one 1" round, the air speed is much higher on the 1" hose. Not sure i buy the concept being all the top draggers in the NW run open filters but hard to argue with someone with so much experience.

[Muggzy]

I run an open top airbox w/K&N filter and ride trails mostly. The thing with trails; unless you know them really well, you're never sure what you'll run into. I've had at least two occasions where I had to cross water that would've drowned my engine without the airbox.

Last month I was hitt'n a lot of puddles on the trails I was riding and the splash over the top of my airbox was enough to start choking my engine. Took me a while to realize what was causing the poor perf. I recently put an Outerwears prefilter over the top of my box but can't say it solved the problem as I haven't run into those puddles again (yet).

As for the higher air velocity mentioned earlier, think about it this way: The venturi principle is what ALL carburetors depend on to function. This requires the air moving past the jets to move faster than the surrounding air in order to reduce pressure and therefore suck fuel. Higher velocity, more vacuum. Yes better airflow means more air-fuel mix into the cylinders but there's a trade-off. The larger carbs need bigger low speed jets to compensate for the lower vacuum they suffer at low and mid speed and that means less precise fuel-air mix. The dragsters don't care about low-mid and I'd be willing to bet that many are too big for a good high end mix as well. I have the original 26mm Mikuni carbs on my banshee and people are telling me the throttle response is as smooth as they've ever seen. And I'm still plenty fast :D Now I just gotta learn to drive :ermm:

[hondamancbr03]

I'm a stock banshee carb fan myself...I've tried 28PWK's, i'm curretly running a 38PWK single on my 4mil just to play around and see what it was like after raising my port timing.
I completely agree with you on the larger carbs losing bottom/mid response.....I will be going back to stock carbs and see no reason to change unless a cub top end accidently falls on top of my engine!

I'm on the west cost and have never, will never ride my bikes on the trails or dirt so i'm an open filter person at this point. Considering trying stock carbs, open air box with lower port timing with the 4mil and see if i can make good HP....Should pull like a tractor.

Nothing better than a little R&D to keep the sport from getting boring.

[Muggzy]

Originally posted by hondamancbr03

I'm on the west cost and have never, will never ride my bikes on the trails or dirt so i'm an open filter person at this point. Considering trying stock carbs, open air box with lower port timing with the 4mil and see if i can make good HP....Should pull like a tractor.

Nothing better than a little R&D to keep the sport from getting boring. [/B]

Yeah, you west coast guys have all those nice clean dunes and sand to ride. That's why you can bling out your 'shee's so nice. It take us HOURS to clean up after and good day of riding - It's worth it though :D

The best thing about these forums is the ability to share and learn from others - awesome. Let me know if that Cub falls out of the sky ;)

[jones711]

The dunes are awsome here but I found a new place to ride. Its a little closer a spot on the arkansas river it has sand draggs,jumps and hill climbs. Being near water i know sooner or later im going to get wet. It does seem the carbs are taking away from bottomend.I know there taking away from throttle response.

[Muggzy]

Originally posted by jones711
The dunes are awsome here but I found a new place to ride. Its a little closer a spot on the arkansas river it has sand draggs,jumps and hill climbs. Being near water i know sooner or later im going to get wet. It does seem the carbs are taking away from bottom end. I know they're taking away from throttle response.

Hey Jones, congrats on the new Banshee. If you're gonna run into water, get the air box. It'll give you an extra 6-8 inches of clearance.

There are a few things that affect throttle response; pipes, porting, reeds, and of course carbs. My Pro Circuit Platinum pipes are known for over all range and are (from what I hear) highly recommended for trail riding. Idk any dif b/c they're all i've ever had. My jugs are ported but I can't say how aggressively b/c I got the bike that way. There were Boysen two stage reeds but changed them for Vforce3's. HOLY S#!T did they make a world of difference. There are some people on here and BHQ that say the VF3's are a high range reed but I can tell you from my own experience: they are awesome!

B4 the VF3's I squeezed the throttle and my 'shee would take off and a second later, it was like someone hit a NOS button (I don't have NOS) when I hit the power band. With the VF3's the whole bottom and mid-range picked up A LOT! Yeah there's still some additional acceleration when the power band kicks in but you're already going so fast when it hits, that it's not as big a deal. Those reeds smoothed out the whole range!

If you can swing the $200+ for the reeds, that's where I'd put my money. But get the air box first.

[hondamancbr03]

Originally posted by jones711
It does seem the carbs are taking away from bottomend.I know there taking away from throttle response.

I agree with the VF3's......If you want to keep the carbs you could consider raising your compression and advance your timing with the VF3's, those three items are not too expenssive and would make a big add to the bottom/mid on your power band.

As Muggzy mentioned...Us west coast guys do have the awesome dunes which allows us to run straight filters and bling the machines.....Even with that I'm still thinking about going back to the air box for better induction.

[Hondamaster5505]

I would love to purchase some VF3's... I have Boysen RAD valves and I have a feeling they're taking from my bottom end..

[jones711]

I went ahead and bought the airbox. Right now Im running fmf fatty pipes,pro design cool head,boost bottle (it was on there when i bought it...),28mm carbs.. I put v3 reeds on a rm250 i had and big differance,so thats first on the list wondering what domes you guys run out here.Also the fattys are cool but my last banshee had pro circuit pipes and my buddy ran toomy, i miss that sound, FMF just dont have,I like the bottom end of pro curcuit but i dont like to loose a drag race (you know banshee thang) any thoughts?:devil:

[hondamancbr03]

When i ran a Pro Design head i ran 19cc domes, that seems to be the limit where you can still run pump gas and get away with it. I ran 19cc domes on my first Banshee for years with only pump gas and sometimes 50/50 race/pump and that engine gave me a lot of good years. I was running 4 degrees advanced on my timing as i do with most all my bikes.