aftermarket air filter = less speed?

ive fitted a hebo foam power filter to my aerox and it doesn't go as fast as it used to with the standard filter
the origional jet size on my aerox was an 86 so i tryed a 90 jet and it bogged, then tryed a 100 jet still bogged but only at top end revs, then tryed a 108 jet and it didn't bog out but the speed dropped to arround 50-55mhp when it origionaly did about 60mph quite easily using quite light rollers
fitted some heavier rollers and still wont get over 55mph.
WHAT THE PROBLEM :rtfm:
ive fiddle arround with the mixture screw but as you make it leaner it just bogs out

 

heres another classic case of....im gonna ignore what everyone else advises
and fit a foam filter

o.k here goes again :w00t: ....open filters on a near stock 50cc are a waste of time....you will mess around for ages to get your bike to run as good as before you put it on....you will acheive more noise...drink more fuel...and the best bit will be your bike will probably break down in the rain

 

And regardless to roller weight you wont get any more top speed from changing them.

 

its baecause now you have no airbox or backpressure.

 

It wasnt until I was running a 21mm carb, power pipe, over sized reedblock, Boost bottle and MHR 70 kit that an open air filter was necessary.

If you have done it for "teh bad bei sound" then dont. Mopeds sounds sh1te at the best of times anyway. Pointless making them LOUD and Slow. hehe.


If its going to be a noisy annoying scooter make sure its fast so the locals dont have to put up with "nerrrrrrrrrrrrrrrrrrrrrrrr" for like 10 minutes while you accelerate off down the road.

 

lmfao well said binge

nerrrrrrrrrrrrrrrrrrrrrrrrrrrrr

 

soz mate i had never knew that foam filters were a bad idea as we say "we learn from our mistakes" and ive now learnt that foam filters dont work on near stock 50's

by the way i dint break down in the wet

 

i did :bird: , bloody cunts, it did make a big dif, but im nt gonna lose a bike for a good 4 days until chris sorted the bugger!

 

My runner works best with the filter though.
Sorry but it's true.
I put the airbox back on, and it runs like a cunt.
Got no grunt left, can't lift the front wheel, wouldn't even hit 60 on my friends road where i pull 60 half way down.

Saying that, my runners jetted well

 

ciaran urs fine in wet? yeh mines sick with open filter lol, just dont want the bugger to break down!

 

when you put the air box back on did you down jet it....because if you didnt it would be running too rich with the box on and jetted for open filter

 

do you think if i get a 70 kit the hebo foam filter will work ok

 

I wouldnt bother with an open filter untill i had a 70 kit and 21mm carb...

just maybe at that stage the air box may become a restriction..

 

when i changed to a koso racing filter i just had to upjet from 86 - 94 :wtf:

 

I did actually.
Loving my scootay :bird:

 

is your koso filter foam or k&n style ?

is it in a enclosed box?

did u get any more speed using it?

 

I havent ridden scooters for long, but trust me, dont even bother with a foam filter

I had a painfully nasty experience once, when I tried to fit my mates k+n filter on my fully derestricted aerox.

to this day i wish i hadnt done it, were i live, theres a coastline place about 11 miles or so away from me, me + 2 of my mates rode down there fine. We'd had enough fun doughnuting and wheeling on the coastal paths and were ready to set off home - only my bike didnt start :emb: :emb:

we ended up ripping the k+n off and throwing it over the marshlands as far as we could throw cos we were so pissed off, it took us nearly 4 hours to get back (pushing my bike on foot + we just caught a good rain shower - my mates were so pissed off with me cos the k+n kept bogging my engine out

I wished to this day I kept the standard filter on the bike cos we were so embarrased watching tractors zoom past us :emb: lol

 

im using a 108 jet for my carb

 

would a hebo k&n style filter work ok
heres a pic
http://www.vltava2000.cz/shops/6746/images-goods/HR9030104R.jpg

 

OK i know this is an old post but lets get into some carb tunning 101

The reason you run a bigger jet when you run a open filter is because there is less restriction and so less pressure drop across the jet thus is doenst flow as much

If you think that putting a stock air box on and going for a smaller jet then you need to look at your jetting skills and your carb understanding
Sure i can understand that a stock airbox is great for the noise side to keep it quiet, but it requires you to run a smaller jet then its a restriction im afraid thats a fact

I come from a long history of setting up jetskis for racing and if i had to jet down due to another filter then i would ethier throw it in the rubbish or give it to my competition and tell him its awesome

A restrictive airfilter will make it easier to tune and there for people can get there carbs right easier and leads to the confusion that they are better

And as far as brack pressure in the intake wtf
backpressure is from gases backing up as they try and move down a passage, the airfileter is the first part of the intake system it can give a restriction but not back pressure