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Air filter upgrade

Discussion in 'General Truck Info' started by CobequidTrails, May 20, 2015.

  1. Has anyone swapped out their stock air filter for a K&N or equivalent? If so, what was the part number?
    Thanx...

    Ken
     
  2. ttc

    ttc Active Member

    i will be once i get my truck.. it made it threw the panama canal yesterday lol. i have yet to order any parts yet untill i have the truck in my driveway but a k&n will be one thing i do. may end up puting some uni filter over the top for extra insurance. i have a k&n in my bmw and it came with the foam filter block and that thing catches amazing amount of crap before it even can make it to the actual filter portion.
     
  3. TRAX and HORNS

    TRAX and HORNS Well-Known Member

    The problem we saw many yrs. ago was dusted motors. Dont here to much about it these days. Lesson learned I guess. Guys were buying aftermarket air filters that weren't quite long enough and didnt seal well. So thats something to think about before you try a different air filter, make sure it seals.
    The price of oem air filters or equivalent is pretty cheap. Ebay sells them, a number of mini truck part suppliers have them in stock. Prices range from 10.00 from michminitrucks.com to 35.00 from those part suppliers that are taking advantage of the mini trk. owners.
     
  4. By using the OEM filter, is there much restriction? I am eliminating the stock exhaust and just going with a straight through can for a muffler so I don't want the restriction on the front end.
     
  5. TRAX and HORNS

    TRAX and HORNS Well-Known Member

    You know Im kinda old school. If it anit broke to try and fix it. The engineers figured how much air it needs to run right at the design stag and I have faith in them that they know what they are doing.
     
  6. ttc

    ttc Active Member

    i would change out of the fact i have them on most of my bikes so washing and reusing is the norm for me. but ya at 10 bucks a pop it would take a couple air filter changes to cover the cost that way but when you see them for 30-40-60 bucks for a filter it seems a no brainer to swap. i also have seen brake shoes for 100 bucks when you can get them for 20 from an honest seller. that kind of stuff really chapps my ass. i keep lists of alternate part numbers for most of my stuff. sometimes a part is different part number just because of the color lol and on another machine.
     
  7. TRAX and HORNS

    TRAX and HORNS Well-Known Member

    I totally agree. Ive been in the mini trk. business a long time and have spent 1000's on parts over the yrs. and try my best to find the right guy that wants to grow his business and to capture my business. Michtrucks has stepped up and has the best prices these days.
    Back when these trucks hit the USA I was paying 120 green backs for a set of brake pads. Talking about scary and trying to explain that to a customer
    was difficult to say the least. But things are getting better.
     
  8. The pollution controls on these trucks is definitely restricting power... the engineers mandate would have been emissions over performance, imo.
     
  9. TRAX and HORNS

    TRAX and HORNS Well-Known Member

    No argument here on the above statement other than most guys in my world are using these trucks as utility vehicles( farmers/ranchers/manufacture plants/construction sites ect).
    All they want is to stick the key in, turn it and it runs. Its when we start talking about performance enhancements and these types of guys get in there with their screw driver and start tweeking things is when it shows up at our shop. Thats where Im coming from.
     
  10. ttc

    ttc Active Member

    what is there besides a cat? do they have a air injection system like most motorcycles? and yes monkeying with carbs is not a good ideal.
     
  11. TRAX and HORNS

    TRAX and HORNS Well-Known Member

    No air injection on either carb. or efi system, Basic aspirated. Its the air screw , idle screw, and cold idle screw is what gets guys in trouble when they start messing with them.
     
  12. Sidebar:
    Are there different sized jets available for these carbs? Or has anyone put on a SU carb?
     
  13. TRAX and HORNS

    TRAX and HORNS Well-Known Member

    The carbs. they are using have a number of applications not just mini trucks. So yea different jets are there its just finding someone here in the states or in japan that knows what they are doing. I think most mini trucks are using "Keihin" carbs.
    You can You Tube - Japanese Mini Trucks Japan - and see a number of video's, some pretty cool trucks drifting and showing up at club meetings.
    Back ground noise indicate performance pipes installed. With that said someone is rejetting.

     
  14. spaner

    spaner Well-Known Member

    http://www.iwt.com.au/mikunicarb.htm

    Read this, check fig #4, more fuel is ok, IF the engine is setup to burn it and make power, when and how is a better question to consider when looking for ponies.
     
  15. TRAX and HORNS

    TRAX and HORNS Well-Known Member

    The biggest thing to remember is that if your truck is running fine then one day it's running poor most likely it's something other than then the carb.
    Perhaps bad fuel, fuel filter, vacuum lines . A carb. will not over night go out of adjustment. The only time it goes out of adjust is when someone starts turning screws(idle, choke, air). When installing different exhaust pipes back pressure starts to change which changes air flow into carb. and rejecting is nessasary.
    Then again if truck sits for a while and fuel starts to separate that may cause low speed and high speed jet openings to be reduced as well as laying on a coat of gunk throughout carb.
    The biggest problem we see is truck sitting for long periods of time and will run fine on the upper end, have a bogging effect when given fuel and runs poor or not at all at idle or low speed.
    A carb. cleaning or rebuild carb. 99 times out of 100 fixes the poor running condition.
    But never over look vacuum lines first and dist. cap and rotor.
     
    Tony Evers likes this.
  16. I am looking for more power because I have upgraded my wheel size. Easiest way to get more power out of an engine is to let it breathe better...
     
  17. TRAX and HORNS

    TRAX and HORNS Well-Known Member

    Sorry I got off track. Yes, more air more power in theory. Adding to much air and then you get in to changing jets and height placement
    of needle valve to get the right burn.
    Thats when you have to start reading plug color. But is that going to give you the power you want ?? The power you want and the power the engine will give with minimal changes is the question. Its a mini truck how much more power do you need? 5 extra h.p. ? Maybe k&n air filter and pipe gets you that.
    75 h.p. +, boxer engine or Yamaha R-1 engine ? Remember its a little 658cc engine thats already having to push 1500lbs.
    Might email James Danko or Don at Yokohama Motors in Japan and ask them what they are seeing in Japan on increasing h.p. on mini trks.
    If you figure it out you will be the man. I know there's a number of guys that would like to juice it up with a few small changes.
     
  18. ttc

    ttc Active Member

    if you have the round air filter i have found a k&n that can replace that and you will retain the stock air box instead of a cone filter at the carb which could lead to jetting issues.
     
  19. Thanx ttc... do you have the part number for the filter?
     
  20. ttc

    ttc Active Member

    Posted in the other forum and cheap fuel filter too
     
  21. ttc

    ttc Active Member

  22. Nautydog1

    Nautydog1 Member

    vacuum leaks are 85% of carb and idling problems, use a vacuum gauge or carb cleaner, carb cleaner will send the engine to high idle if you have a vacuum leak, make sure the vacuum port in the air cleaner canister is working properly, also check that your vacuum advance hose isn’t cracked coming off the distributor to the vacuum manifold tree. The vacuum manifold tree is brass on the bottom to go in to the block and plastic on top. Plastic wears out with time and will break or leak, which causes a vacuum leak. Some manifold vacuum trees are 3 or 4 port, make sure to replace it with a new one. When I buy parts I buy 3 at a time that way I have them on hand or in case they can’t get them any more. The vacuum manifold tree is located behind the carb. If you looking at the carb from the right side of the bed, it will be to your 1 O’clock tucked down inside. Remember to use a marker or different colored tape to mark the vacuum lines so you know where everything goes back too! Good luck!’:cool:
     

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