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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.