Yamaha 2004 Raptor 660

[daviddiaz1986]

Hey yall. I just traded my 89 rm125 I bought for 250 bucks . For a 2004 raptor 660. The bike is in very good shape. But when running I can hear a kinda knocking sound I think. The motor runs like a beast though Hella power. Is that normal I know some atv dirtbikes always kinda sound like there knocking. Also on the right side of the jug there was a small request half assed striped into the hole. Did anything other then a bolt go in that hole. I tried to find a exploded diagram of the engine but partzilla.com did not have raptor 660. Unless it was under some name I'm not familiar with. Thanks for the help. Hopefully it's nothing major.

[Reactant]

Never had a Raptor, but if you hear a knocking from almost any 4-stroke engine, chances are it's the valves are out of sync a bit. There's probably bunches of tutorials on the Internet on how to adjust your valves, especially for a post-2000s Raptor. As for the hole, I've never had a Raptor.

[daviddiaz1986]

Ok thanks man

Has anyone got any info pertaining to this hole in the side of the cylinder. It's just a hole no screw goes in it that I can see from pics off the interwebz

[DBargs96_2strokes4life]

Lol that little hole has a little bracket that holds some wires as long as it's not leaking any oil or coolant your fine.

[jjktmrider]

How badly is it knocking ? Is it more of a rattle or clatter up top ? I had 2 of the 660's and 1- 700 none had any knocking or rattle. You could hear the valves a little bit but nothing more. The 660's that have been hammered hard will take out the big rod bearing , that will make a low, deep sounding knock. Valves that's needing adjusting will have a faster rattle.  Also a noise on the left side (stator) can be a loose flywheel, another issue that has happened to many, especially if the PO had done some motor work and not torqued down proper.

 

Raptors have a tendency to be owned by those that beat the shit out of them with little proper maintenance . They need high quality oils and the rods/crank won't take sustained high rpm running.

Edited August 29, 2015 by jjktmrider

[DBargs96_2strokes4life]

How badly is it knocking ? Is it more of a rattle or clatter up top ? I had 2 of the 660's and 1- 700 none had any knocking or rattle. You could hear the valves a little bit but nothing more. The 660's that have been hammered hard will take out the big rod bearing , that will make a low, deep sounding knock. Valves that's needing adjusting will have a faster rattle. Also a noise on the left side (stator) can be a loose flywheel, another issue that has happened to many, especially if the PO had done some motor work and not torqued down proper.

Raptors have a tendency to be owned by those that beat the shit out of them with little proper maintenance . They need high quality oils and the rods/crank won't take sustained high rpm running.

so true 3 of my friends have raptors 2 660's and a 700. They beat the shit out of them especially the 660 and it still goes.