about how much hp will this add with a HCS3, an exhaust, and an intake as supporting mods?
That one I have no idea, maybe someone else can chme in.
does the crank come with the 2 crank bearings?
can you run this crank with the stock crank bearings?
Yes, I have run mine with OEM bearings and seals since day one.
which bearings are better quality?
I would run OEM, I have heard of some failures with the Hot Rods.
if i'm running a stock piston is it necessary to have it balanced?
No, see my responce below.
and what aftermarket pistons would be safe to run not having the crank balanced?
To be honest, you can run it with any aftermarket piston and not balance it. I have had my Hot Rods stoker crank installed in one of my 450r's for over two years and have not had any problems with it. I took it out of the box and installed it. I ran it for the first year with a stock bore Wiseco 11.5:1 piston, then since then I have been running it with a Cylinder Works big bore kit. I am sure some people will tell you you must ballance it, but from my experiance, I have not found it to be nessasary. (I bet my stoker crank as at least 150 hours on it.) If you have the extra money and time, by all means get it ballanced, but I do not think it is a "must do".
2004 TRX450R, 2008 TRX700XX
(BITD #639 Quad Ironman Expert)
2015 sponsors: Teixeiratech.com, Motowoz.com, Snailmotorsports.com, My bank account.