We recut the slope on the head after decking it and I haven't re jetted carb it dosnt feel like it needs it. I havnt even had the carb apart to see what's in it yet. What's stock jet size. I appreciate the advise
Like Blaaster says, no need for a bigger carb until you make big rpm or displacement.
Likewise, the stock rubber intake tube is a very good design, well tuned. Just open the lid up a bit.
Here is how I fitted my 39mm KTM carb to the Blaster airbox, 2nd version:
With this improved version, its length favours the midrange.
The angled entry to the airbox gives broader rpm range than the first straight entry I had.
Still, the stock Blaster carb and airbox intake work very well up to 35hp.
Yes, that is snow and that is a Blaster inside a minivan. Try that with a Banshee/Raptor/450!
Even with the slope of the head cut to match the dome, the chamber is a poor shape.
This drawing might give you some ideas of a good chamber design, and here is a photo comparison:
You've got a pipe, good! Maybe good for 2-3hp more, 19-20hp, maybe.
The next step is a better cylinder head, it will allow everything else, compression and porting.
Raise the exhaust port 1mm and widen it 2mm, bring the piston to head squish to 1mm.
Leak test and then do some plug chops to get the jetting perfect, expect 25-32hp.
I've run lighter and heavier flywheels on my motorcycles and cars over the years.
There is a place for them, but I thing the average rider will do well with stock.
Lighter flywheels disrupt smooth idle and smooth take off. More of a drag racing mod.