Both stock heads are in fine shape. No blow up damage or anything like that. The stock/bore port cylinders w/OEM pistons aren't in the worse shape. Pistons look great. Cylinder bores don't have gouges/scoring etc, but have wear at the bottom of the cylinder walls from the piston skirts, from simple usage. I would suggest boring .010" over to true the bore back up. Deck and bases of the cylinders are great.
guys, make offers on all the parts:
banshee:
stock carbs w/good threads for carb caps
stock head
stock head shaved .030"
stock airbox
stock ported reed cages w/TDR carbon fiber reeds
k&n filter (little beat up)
stock bore/port cylinders w/oem pistons
stock port cylinders bored .080" (will need to be bored to .090" over)
yfz450:
(2) stock rear swingarms
stock muffler and mid-pipe
studded full set of stock tires on stock rims
stock front bumper
stock foot pegs w/guards
rear brake caliper
my quad sounded like that after i ported it and i had stock gearing w/20" tires. i now run 14/41 and it made the rpms actually drop between gear changes. i love this gear ratio. it could also be your clutch slipping.
I have a used set of 3/8" drive SAE impact Snap-on sockets. They come on the metal rail and the sizes are, 3/8, 7/16, 1/2, 9/16, 5/8, 11/16, and 3/4. $70 shipped.
If running stock carbs, that was enough main jet, so I would say that carb was starved of fuel. Maybe time to gut that gas cap and get a pingel dual outlet fuel valve?
Like said above you should be eatin that 450. I have a '04 yfz450 w/ported head, HMF slip-on, uni filter w/no lid on air box and my banshee w/has nearly identical mods to yours will beat it. You have something wrong. For sure check carb sync.
How the hell did you come up with, or get your transfers that low? 48.3mm I don't even think is possible, as the stock dimensions are 43mm from roof to cylinder deck.
Thanks for the info guys. Some interesting reading. Its too bad when two companies can't get along in the end, cause one of them gets greedier than the other and one of them or both of them end up closing their doors, cause of the lawsuits that start flying around. Good to know that they can build fast motors. I'm to assume that their machine work, crank repair, etc is decent too??
i was searching for banshee parts on ebay and came accross a co mpany called "Superior Sleeve". anybody hear of them, or use them? are they any good? here is their website address:
http://www.superiorsleeve.com/
IMO, the best/most accurate way is to find out what the UCCR (uncorrected compression ratio) is. You will need to find out the trapped volume (volume above the piston when at top dead center) and compare that cc volume reading to the volume above the piston when the piston is at bottom dead center. This will tell you exactly what's going on and the guessing game of what fuel to run is over.