I just installed a wiseco piston in my predator and when i fired it up there was a loud clanking sound come to find out then piston and exhaust valves were hitting,Everything is in time,piston is installed correctly I never touched the valves or buckets or nothing.I bought the piston from HPD if it even matters not sure what the hells going on can someone please help a brother out. Thankyou

 

oh buddy.... sounds to me like your valves may be out of spec. This happens to predators from time to time, is it hard to start? if it is it may be valve adjustment time... that's all i can think of if you haven't changed anything else and are SURE the engine is in time... hope someone else has some insight if this is not your problem...

 

Hey thanks I'll check that out,everything is to stock specs it fires right up no problem but you can hear it the piston and valves hitting .

 

I advanced my exhaust cam 1 tooth from the gold link and it runs like a raped ape.So that made me think if I had to do that then maybe my cam gear sprocket twisted throwing my timing marks off.So my question is can the sprockets twist,and whats holding them on?

 

YEs they can spin they are just pressed on. Seen it more than once even with stk. cams and motor. ARe you 100% sure that the piston isn't in backwards?

 

wow! speedwerx nice job! i hadn't even thought of that! i agree, make sure the piston is not in backwards, since you're complaining abut the exaust valves hitting and they're the bigger ones, this would make sense!

 

I'm Positive I put it in the right way the arrow facing foward to the exhaust .I just rode it today and it runs perfect but I'm still worried that I had to advance my cam.Ahh the hell with it I'm just gonna buy new cams so I dont have to worry about it.Thanks for all you guys input on this, much appreciated!!!