Better air filter

maniac57 has a tutorial for fitting a lawn mower filter.
http://motorbicycling.com/showthread.php?t=54785

I have seen air cleaner housings made from the end of a beer can. Drill the screw holes and stuff in a foam element.

Another Maniac 57 inspired Air Filter. Made from plumbing parts. Sink drain screen, decorative pipe flange and the NT carb part that sandwiches the stock filter behind the sink screen.
http://motorbicycling.com/picture.php?albumid=655&pictureid=7682

GearNut said:

maniac57 has a tutorial for fitting a lawn mower filter.
http://motorbicycling.com/showthread.php?t=54785

Click to expand...

That filter is little restrictive for the Happy Time motor IME.

Easy for you to say. freakin thousand miles away. I got 2 bikes using this set-up both are 35mph bikes. The point here is to be creative and enjoy the bikes. Home spun mods are fun. where's your sense of humor.

OK I am laughing now lol.

I used the likes of a old small food can drilled out and fitted to the carb with just three plys of panty nylon stocking zip tied and streached on. Got 45 MPH and great power all around from stop and go for better than 6000 miles.

Prolly have to rejet the carb to run that other style.

Way Cool!!!

Try taking that mesh garbage out of the stock air filter housing and put in a piece of sponge the same size.

I used a sponge and the bike ran like the chock was on..

I'm running the briggs filters on two motors and it works just fine. Several times the filter area of the stock filter, very low restriction, and cool tin looks.
No rejetting needed if you're in the ball park....

Memphis must be a lower elevation over there? At 6000 foot over here tried every filter and homade silencer contraption I could think of and it always robbed power for me .

Did come up with a conception of a slincer. Still stopped using it however. More power abroad proved to be with out it.

My 49cc Morini 10 plus Hp engine would never make it to the likes of 12,000 rpms very well. With out leaning my carb for less oxygen it four stroked mad crazy! Was trying to blow the motor out. Way less power was developed from it that way at every turn of rpm.

At 15,000 miles did a tear down still had cross hatches upon the entire bore. I used a large K&N filter on a 21mm carby in the long run. ''19mm had less power'' Just that suddle change in air availibility made a substancial differance. IME. That 19mm carby was jetted leaner too. Jets did not swap over to the larger carb..

That Morini and 300+ pound load could do as well as 55mph but only in the dead of winter here with my gearing. Air is more dense at such temps compare to say July.


The Happy time of course ported it out everywhere I could pull it off. Port matched in every way. Felt like no port work was done . Just was differant for me. When air got slowed down it was ''less power''

I know that filter will work . Did it myself. Can work just fine . It will be less noise for sure. Fine tune for it, quiet perfect. Have run that way myself. Peacefull cruiser for shure. Not for what I expect from a ''racing performance application'' for what I have come to expect over time anyway.

We had stock china motors as fast as 46ish mph. Only pulled it off with a 19mm carby tho. Just the elevation here I guess shrug.


Shoot I want a friggin turbo. Man I mean bad! Be so cool. Just not on a two smoke lowls.

Need valving for that...

A great way to check filter restriction is to pucker your lips to it and blow on it. Suddle differences are observable.

Just make sure that the sponge is 'open cell'.

Here's another fitted on my daily driver. I used the ball end of an old microphone instead of the sink drain inside the "velocity stack" hehe. I'm 65 ft above sea level here running NT's with pocket bike pipes and middle position clips with 64 jets. Stock mufflers run well with mid position stock 70 jets. I really don't believe there is any performance advantage/disadvantage here. Just tinkering.

look at that! fuel filter upside down. HuH

I'm a singer. That microphone endcap is a cool idea for a filter cap. I'll be using that for sure.

daf

The round mini solar charged lawn lights' outer casing is a perfect match for the carbs filter side. Modified the black plastic gasket that screws on to carb before filter, then mounted lawn light casing to that with some adhesive & elec tape (for now anyway). Screened the open end with a boom box wire mesh speaker cover and added filter filler inside for good measure. Mounted it all using stock cdi screws. all stuff sitting round the house. Nothing special. But now my bike screams! had to post on account of the casing and carb fitting so well. for what its worth. Post pics as soon as I get a new phone....or can borrow my teen daughters.......Lol....like THATS gonna happen anytime soon

http://motorbicycling.com/showthread.php?t=17262

Above link is for the "leaping Tuna air filter" and below for the bigger "flying dogfish model"

http://motorbicycling.com/showthread.php?t=24718

I also now make my own copper fuel filters using stainless steel wool as the filtering medium. Works well and looks classier than a plastic fuel filter.

Making your own stuff is fun.
SB