High performance air filter kits for 4 stroke?

Discussion in '4-Stroke Engines' started by KeepOnKeepnOn, Jan 9, 2009.

  1. Are there any nice air filters that fit right up to the HuaSheng/Hondas? The carb is flat so the normal round rubber mount with a hose clamp style filters don't work (or is there an adapter for using those type?). A velocity stack would be nice too. I just don't like the look of the stock square plastic filters.
     
    Last edited by a moderator: Jan 9, 2009

  2. HoughMade

    HoughMade Guest

    I don't like the stock look either, but I don't know of a manufactured alternative- use your imagination. I did...but admitedly, I was going for an old fashiondy look more than anything else.

    Keep in mind that there is a crankcase breather that goes to the air box. I just put a PCV valve on mine.
     

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  3. Air Cleaner

    Hi Hough, did you use a tub drain, and a altoids can? I've used chrome tub and sink drains before, very nice!

    Mike
     
  4. HoughMade

    HoughMade Guest

    Correct on the tub drain, but the can is from a candle from the $1 section at target. I cut out the center of the lid and epoxied the drain cover on.
     
  5. Good Job!

    Hi Hough, well it looks nice, and the cotton pickin thing that it comes with does NOT!

    you put pcv valve in the end of that lil hose form crankcase?

    Mike
     
  6. HoughMade

    HoughMade Guest

    I did- not really necessary as i just ran the tube open, but I didn't like the idea of dust getting in there. Here is a pic, but the PCV and tube are obscured by the remote oil drain hose- but you can get the idea. You can see the PCV hanging down behind the drain hose.
     

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  7. pcv valve

    Hi Hough, from what I remember of the PCV valve it is designed to have the ball drop to seal, and only let out positive pressure. Therefore yours must be a spring-loaded type?

    I know of certain applications where that fact was ignored, and the pcv did not do what was expected of it.

    Why did you decide not to port back into the air cleaner? Were you thinkinh that since you reduced the surface area of filtration that you did not want to risk oil impregnation?

    Mike
     
  8. MotoMagz

    MotoMagz Member

    Vilosity stack and performance air filter

    I installed a 7/8 stack and a high performance filter on my 4 stroke with a few simple modifications. OKay here goes trying to attach picture !!
     

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  9. MotoMagz

    MotoMagz Member

    velocity stack performance air filter

    Better photo I hope !!
     

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  10. HoughMade

    HoughMade Guest

    Honestly, just wanted something to plug the hole, but let pressure out if necessary. I wasn't concerned with the original function of the tube which was to make sure any oil vapor vented was burned off rather than released.
     
  11. Motomagz, tell me what a 7/8 stack is and tell me more about the simple mods. It looks like you made an adapter to use the typical high performance air filters. Thanks for taking the time to post the pic, a pic of the adapter with out the filter on it would really help.

    Hough, I was thinking about screwing a hose barb into my gear box where the vent is, then directing a hose onto my chain. That way all that leaking gear oil would serve a purpose.
     
  12. MotoMagz

    MotoMagz Member

    Air filter and velocity stake

    Keepon, it is a 7/8 velocity stake(ebay).The 7/8 opening is the same as the carb.The air filter(ebay) is mounted to the velocity stake.You will need to make a adaptor for the velocity stake out of a large washer to mount it to the carb.I will put some detailed pictures up tonight.thanx MotoMagz
     
    Last edited: Jan 10, 2009
  13. HoughMade

    HoughMade Guest


    That's funny- but mine didn't even leak oil when I had the hose completely open.
     
  14. Thanks Moto, I get the idea on your adapter now. Did you epoxy the velocity stack to the washer? Then some formagasket to seal the washer to the carb. Good idea using the velocity stack as a mount.

    Hough, I put the recommended quantity of gear oil in the gear box and it has never stopped spewing out, I can't believe it hasn't gone dry yet.
     
    Last edited by a moderator: Jan 10, 2009
  15. HoughMade

    HoughMade Guest

    if you want to try gear oil, no more than 3 ounces, but what bicycles-engines recommends did not work for me. I now use a lot of grease. There are some posts about my gearbox lube search here somewhere.
     
  16. MotoMagz

    MotoMagz Member

    Keepon,I used two 1"aluminum threaded posts w/screws.You can find them at Lowes for a buck each.They have a flat bottom so they won't pull through the holes you will need to drill in the washer. So the washer gets 2 holes to mount stack & 2 holes to mount to carb. Let me know if you need more pictures,thanx MotoMagz
     
  17. When you say 1" threaded post you must be talking length not diameter. Steel rod seems like the stronger, easier to find, cheaper way, rather than aluminum rod.
    So... no expoxy, countersunk screws holding the stack to the washer (first pair of holes). Nuts on threaded rod, holding the washer to the carb (second pair of holes).
    Regardless, I have some workable ideas for attaching a nice air cleaner. Thanks, MotoredBikes kicks arse for ideas to solve problems and inspiration.
     
  18. MotoMagz

    MotoMagz Member

    Yes length and it is a hollow post with threads in the inside so you can secure it with the screw{that comes w/the rod).Welding threaded pipe to the washer and grind it flush was my first thought put got no welder!! MotoMagz
     
  19. Here is my solution, which turned out to be a major pain in the rear. It looks great though. No noticeable change in performance.
    As Moto suggested I used a large washer with the velocity stack mounted to it and the air filter then mounts to the velocity stack. The opening for my carb was actually 3/4" not 7/8". The distance between the bolts which hold on the carb and original air filter is perfectly wrong, its too close together to sit outside the Vstack and too wide apart to drill right through the Vstack and bolt through it. Instead I had to file away big notches in the base of the Vstack so that the heads of the bolts going through the washer would clear and be useable. The Vstack is epoxied to the washer which locks the bolts in between them, although they turn freely they can't be removed. Also the carb has some openings on the face and the original airfilter clearly had notches to allow air flow past them, so I had to drill and notch for this in the Vstack/washer. Also, the Vstack had mounting holes drilled in it for its original application (goped or mini bike) which I filled with epoxy putty to smooth out air flow as much as possible. The pictures do a better job of explaining than my writing.

    Edit: I didn't even look at the pictures until I posted them. They are all blurry but you should get the idea.
    I got the air filter on Ebay.
     

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    Last edited by a moderator: Jan 23, 2009
  20. MotoMagz

    MotoMagz Member

    It Does look good.I also had to grind out the area for the bolt heads.The only thing I did different was to use the two holes in the stake to mount it to the washer.That way it could all be tightened down.
     
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