GT avalanche 4.0 build

Bike being used is a 2012 GT avalanche Xl frame 26" tire. Got the bike off craigslist for 100$ could not pass up the deal considering the bike goes for 540$.. found a few still going for 350+.
engine kit is the black slant head from engines online shop.com has 30 day warrenty.
Parts order -upgraded 7mm copper wire & ngk boot,ngk plug ,TI-wrist pin/copper head gasket from juice moto, upgraded hardware & Loctite ,oil from local mx race shop.
Rear sprocket adapter from pistonbikes. or the HD hub kit from Dax.. need opinions on that .

Mods to do- clutch cable easy pull, clutch adjust
possible carb upgrade not sure which one , then expansion chamber most likely from a kx65.

Issues-is the oval frame but ive seen a avalanche 2.0 another member used and mentioned the SBP large HD frame mounts .. which is A U-bolt with a flat piece of steel bar with 2 holes drilled in it. I located a website that has (HD steel muffler clamps) which im sure I can find a clamp to fit my bike then rubber mallet the U bolt to form fit it shouldn't be to hard.
http://www.delcity.net/store/Saddle...t_1.r_IF1003?gclid=CJCowOLF5rwCFRQV7AodUB4Aeg

tell me if I have missed something

let know what you think of this idea>

i am going to attempt to mount up a sprocket to the rear disc brake hub
http://spookytoothcycles.com/engine-kit-parts/drivetrain/40-tooth-rear-disc-brake-sprocket.html
let know what you think of this idea.

https://www.affordablegokarts.com/m...Product_Code=5321**&Category_Code=MTRBK+PARTS

I really like the idea of being able to swap sprockets out quickly depending on riding conditions I could use the 40 for road riding, and use the 48 for offroad

or I might order a super sprocket from kings.. ive just read a lot of horror stories about dealing with him.. as in its hit or miss. and that his sprocket top hats are 8.5mm instead of 8..

another option that I found is the jakes website now has a top hat setup as well but its over 100

leaning towards spooky and AGk

any advice??

okay well i mean the engine kit comes with the rag joint and all that so ill have it if it ends up not working, like i said i just really want to go the disc brake mount sprocket way so i can quickly swap sprockets depending on riding conditions . im just going to give it a try the spooky tooth cycles sprocket is only 23$ isnt bad..

Just a heads up spooky tooth cycles is no longer carrrying the disc brake sprockets would have been nice to know before they decided to send me out the a 40 tooth rag joint instead of what i payed for...so once i get the part returned and my money refunded looks like ill be ordering a new sprocket from here

the 40 tooth
http://custommotoredbicycles.com/sprockets_for_disc_brake_hubs_unviversal_disc_sprocket_adapter

seems to offer many different sizes as well.. for those of you looking for DISC brake sprockets .