head bolts

11_FX4 · Oct 19, 2011

Im getting my head back soon and a few things I want to get in order before I get it. Can I reuse the stock head bolts or are they torque to yield? Also I have a manual but it has no torque specs as far as putting the engine back together, could someone be so kind as to give me the torque specs for putting a head and jug back on the engine? And finally where is everyone ordering the thin cometic gaskets for a 85mm bore?

P.S. I searched but probably not hard enough, the search pulls up old and I mean old threads that have no more pics or links that are dead

bones · Oct 19, 2011

29lbs on the 4 long ones and 14lbs on the 2 allen key bolts ... and i dont remember the specs on the one small bolt that holds the jug

gaskets : http://www.cometic.com/powersports.aspx

rappy'97 · Oct 20, 2011

I tighten the head bolts to 32ftlbs, and get the allen heads as tight as I can.

11_FX4 · Oct 20, 2011

Thanks guys

11_FX4 · Nov 4, 2011

Ok one last question, I have lost two of the copper washers for the head bolts. Can I replace the copper with a steel washer or the same size and thickness?

'00 WO-YA! · Nov 4, 2011

I wouldn't, get copper, the expansion rate is different & the copper will seal differently (if a steel washer sealed at all). Yamaha did that for a reason. Also you asked about reusing the bolts, always check bolts for stretch, usually when they need replacing it's obvious to see.