I had a real bad clicking in my motor of my 03 raptor, so I adjusted my valve clearences to spec. It helped a littel but I still have a clicking sound but it sounds lower in the motor like maybe the piston or crank or something down there. If anyone has any suggestions I am open to them. I am very mechanical but I have never had a small engine apart just V-8's. Anything is helpful

 

What year is the Raptor?????????????

 

it is an '03

 

Sounds like normal wear to me.

 

Any other symptoms? Does it get louder when you rev it? Does it go away when you rev it? Can you feel it in the case with your hand? Is it different when cold than hot?

 

it could be the cam decompression release or whatever that went bad on mine or got loose and it made a ticking noise it was a quite fast tick too

 

I found out what the problem was. My front mount on my nerf bars was loose and the bolts were rattling around and making the sound. I was riding the other day climbing creek banks and rolled my quad down the hill. I t didnt hurt the raptor any, or me . It was a lot of fun. Also I ride a lot at high speed and I was wondering if I went with a big bore what would be best for durability compared to horsepower gains the 673 kit or the 686 kit?