03' 660 grizzly WILL NOT START!

[WarPepper]

I sure could use some advice on this one. I recently purchased an 03' 660 grizzly 4x4 from what i THOUGHT was a friend.

I started replacing and ordering parts as soon as I began to break it down. So, here is what I've replaced so far:

-battery,relay,starter

-wheel bearings, tie rods,cv axles, front diff bearings and seals,

-carb, throttle cable, hand switch for throttle(thumb switch as*.)

-brake master cylinder, calipers,pads,wheel studs/nuts

-gastank,petcock, fuel lines, fuel filter,air filter.

-plug,coil wire,key switch.

I think you should be getting the picture by now. I planned on this thing being right when I finished. Only after I tore down the top end, cleaned the head, top of piston, rings and replaced gaskets(only), I get fire to plug, fuel (i think) to the cylinder , and by timing light Ive verified the timing is right, It won't FIRE UP when I spin it over. I did check compression, and through conflicting opinions it says that 168 to 185 is normal. I am only getting 25 psi no matter how many times I spin it over with the throttle wide open. is the decompressor on the cam gear causing this reading or do I need a top end kit also? any advice is  more than welcome.