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

[jasonpadilla]

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

 

[GearNut]

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)

 

[wheelbender6]

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.

 

[gothicguy64]

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 .

brad

 

[AussieSteve]

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.

 

[Schwinn-Locura]

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)

What exacly do you mean by notch the piston?

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

 

[AussieSteve]

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.

 

[Schwinn-Locura]

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.

Ah ok, that makes sense. Is there anywhere I could get more into about this? Seems like a fun weekend project.

 

[AussieSteve]

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.

 

[Schwinn-Locura]

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.

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.

Edit: After planning on doing some porting, and after a little research I think thats what I'm going to do.