Engine Problems...weird clacking noise... Videos inside...help

[GORBO]

my brother and i have been building this 99 900rr for him and having some engine problems,.... heres what it does.

-starts fine, quiet as a mouse on idle, motor sounds great on idle

-when you start to rev it at all it makes a shittyass clacking noise from what sound like the head, also it wont rev past 1500 RPMS, it will just die out

-its not the cam chain

Heres the videos, if anybody thinks they might know whats happening Im grateful 4 all the imput, its been driving me mad tryint to figure it out, hopefully this biaaa isnt knocking

two videos............

[nomedia="http://www.youtube.com/watch?v=SDopIwOXR3U"]YouTube- 900rr Weird engine noise TWO[/nomedia]

[nomedia="http://www.youtube.com/watch?v=dZctc6dZ478"]YouTube- 900rr weird engine noise ONE[/nomedia]

[old man roger]

videos wont play for me gorbo

[GORBO]

let me check and make sure my photobucket account is publice OMR, u the man i was hoping would loook, hold on ILL fix them

[GORBO]

Originally Posted by old man roger

videos wont play for me gorbo

I just changed them to youtube, photobucket was being a pain, I Couldnt get them to embed, just use the link if you would please

[TheFBomb13]

weird .. off timing maybe ?! are these interference motors? hope its not a spun bearing

[GORBO]

Originally Posted by TheFBomb13

weird .. off timing maybe ?! are these interference motors? hope its not a spun bearing

i do kno wthat its definatley in time, Im not sure what you mean by interference motors though??

yeah hopefully its not a spun bearing but if it is then at least I will knwo whats wrong with it and can go from there

[old man roger]

doesnt sound good at all if it were mine i would do a compression check , it sounds like a bad valve ..

[old man roger]

interference motors have no clearance between the valve and the top of the piston if the the valve timing is off the valve will hit the piston

[TheFBomb13]

Originally Posted by old man roger

interference motors have no clearance between the valve and the top of the piston if the the valve timing is off the valve will hit the piston

come on .. who doesn't love bent valves

[old man roger]

Originally Posted by TheFBomb13

come on .. who doesn't love bent valves

i would say gorbo

sorry gorbo didnt mean to laugh at your problem