best mods which 1 to start with? and maybe top 5 in order

Discussion in 'Performance Mods' started by jasonpadilla, Aug 22, 2010.

  1. jasonpadilla

    jasonpadilla New Member

    I wanted to hop up my skyhawk and I'm looking to find out where to start, and maybe go from which mod to do 1st then 2nd and so on maybe a top 10 or top 5, any help would be appreciative

  2. GearNut

    GearNut Active Member

    Everyone has differing opinions.
    Here's mine:
    1. Replace all factory hardware with SPB hardware kit.
    2. SBP Expansion chamber
    3. Notch the piston.
    4. Match port intake and exhaust manifolds and clean up manufacturing flaws in ports.
    5. Quality spark plug wire. (assuming you all ready have a quality spark plug)
    6. Lap the head gasket surfaces true on the cylinder and head.
    7. Replace all factory bearings with quality ones. (A replacement roller bearing for the big end bearing has not been found yet as far as I know)
  3. wheelbender6

    wheelbender6 Well-Known Member

    The same principles of hotrodding a car generally apply to all motorized contraptions. Since you have a 2 stroke, start with an exhaust expansion chamber from Sick Bike Parts or another source. Don't confuse an extended exhaust pipe (like Long Poo) with an expansion chamber. The extended pipes look great but do not augment power.
    An expansion chamber has a variable diameter. The diameter of an expansion chamber will increase almost at the engine exhaust port.
  4. gothicguy64

    gothicguy64 Member

    i have a fullyworked rocksolid 48 cc motor .
    i had the stock pipe thats been chopped an drilled ,but i changed it to a long street (poo poo ) . so far it only adds more bottom an mid but ive lost 5 kmh in top .
    i used to get 64 kmh now i only get 59 kmh .
    but with the long street i can pull wheelies or spin rear at lights if i dump clutch to fast . an yes i out drag cars to 45 kmh .
    i hear a stock motor 48cc can only do 45 ish kmh an yes they do ive out run a few here in SYD AUSTRALIA .

    Ive even had a few cops ask me about my shaft driven bike they love it even tho it more than 200 watts , try more like 1600 .

  5. AussieSteve

    AussieSteve Active Member

    Jason, do you know how many times this question has been asked? (Roughly once a week forever is my guess.) A search would have produced a million results.

    One thing hasn't been mentioned above. Not really a mod, but ensure that your inlet tube is very well sealed to the carb and the barrel. Consider sealant or an 'O' ring at the carb end.

    Gearnut pretty well covered things in the right order.

    One other thing - blue Loctite is your friend.
  6. What exacly do you mean by notch the piston?

    Is this just making it lighter, or are you doing something else?
  7. AussieSteve

    AussieSteve Active Member

    When the piston is at top dead centre, it still partly covers the inlet port. By filing off the offending part of the piston skirt, efficiency is improved.
  8. Ah ok, that makes sense. Is there anywhere I could get more into about this? Seems like a fun weekend project.
  9. AussieSteve

    AussieSteve Active Member

    A search might turn up a bit more info. I vaguely remember seeing a pic somewhere. Forgot to take any when I did mine.
    In effect, remove the intake tube, turn the motor until the piston is at TDC, then mark the part of the piston that is visible partly covering the opening. Disassemble and file or Dremel off the marked portion. Smooth the file marks and reassemble, ensuring that you have a good seal between the carb and intake tube. Done.
  10. K, thanks for the info. I'll do a search and see what I find.

    Also, I will take a look while waiting for some other parts to come it. :D

    Edit: After planning on doing some porting, and after a little research I think thats what I'm going to do.
    Last edited: Aug 23, 2010
  11. motorpsycho

    motorpsycho Active Member

    expansion chamber and a bigger carb will give you a start.
    those 2 things alone will really wake up one of these engines.
    but there are also other things you can do to get more power as others have mentioned.
    start with simple bolt on parts, and add them one at a time and do a test run after you add each part. it's too difficult to get an idea of what part is doing what if you add a bunch of stuff at the same time and then run it after you put them all on.
    a good high flow air filter will help a little too.
    get more fuel & air into the cylinder and get exhaust out of the cylinder faster and you will make more power. an expansion chamber will sort of add a slight supercharged effect if it's tuned right.
  12. I finally got my bike working again. I got all my mods on, and carb tuned. One of my first runs I slid out on a corner (shouldn't have been going so fast) and I lost alot of skin. Will probley be done riding for a couple weeks. At the moment it hurts constantly.

    It could have been worse, I almost got hit by an oncoming car.
  13. GearNut

    GearNut Active Member

    Yikes! I am sorry to hear it!
    I hope you heal up quickly. From what you say you are certainly better than worse off.
  14. Well theres no bone damage or anything, just loss of skin from sliding on the pavement. Not sure how long it will take, but I'm gonna start riding ASAP.

    Edit: Now that I know what falling is like, I'll probley try harder not to do it. hehe You don't realise how fast your going till you hit the ground.

    The weird thing is, I didn't realise it was a big deal till I already left, and was almost home. Then it hit me what just happened.
    Last edited: Aug 27, 2010
  15. GearNut

    GearNut Active Member

    That's called shock. Folks can accomplish amazing feats when in shock and a whole bunch of adrenalin is in their system. Sometimes it is for the better, sometimes it can make injuries worse.
    Now this may seem strange, but I have found that after your patches of skin displaced with pavement have scabbed up, brief but frequent swims in a chlorinated swimming pool helps out alot with preventing infection and speeds up the healing process. Stay out of jacuzzis or spas as some folks call them. They tent to lift the scab off, not good.
    Cool water is important.
    Again, this is from personal experience. I cannot vouch if it will work well for you, but just maby...?
  16. Thanks for the tips, at this point putting water on the "road rash" almost brings me into tears. When if first happened I couldn't feel them so I was able the get the guts nice and clean.

    I'm thinking in the next couple days I'll probley have some good scabs so that should help a bit.