650 Heads For A 600 Model 30 1958

Ironhead · Post by **Ironhead** » Mon Jul 13, 2009 10:15 pm

Hello again everybody what a brilliant site this is for info.
My question, whilst looking at magnetos on E-Bay A pair of 650 heads came up so in my haste I bought them, one of my heads the studs are broken off on the inlet so somebody has drilled off centre and put in a small metric stud 6 washers and tightened it up, I don`t think I can helicoil it not enough metal.
Are the heads the same for all twins the bores being the same, so what is the difference between a 600 and a 650 engine wise, if they don`t fit I will re-sell them
Thanks Alex.

wilko · Post by **wilko** » Tue Jul 14, 2009 2:09 am

Do a search here. Don is probably sick of answering this one. There's differences between early and later 650 stuff.

Don Madden · Post by **Don Madden** » Tue Jul 14, 2009 3:49 am

Age counts! The rare 1958 650 used the 600 heads. 1959 650 had it's own, one year only, head & 1960-up do not interchange with any earlier.

Cheers, Don.

Ironhead · Post by **Ironhead** » Tue Jul 14, 2009 8:43 pm

Thanks for the info.
Alex.

Don Madden · Post by **Don Madden** » Tue Jul 14, 2009 9:26 pm

600cc/1958 650cc heads have 3in recess for the cylinder top spigot, 1-1/2in spacing between inlet manifold studs, 1-1/2in dia. exhaust port. 1959 650cc heads have 3in recess, 1-3/4in stud spacing, 1-3/4in exhaust port. 1960-up 650 heads have 3-1/16 recess, angled studs & 1-3/4in port.

What did you buy? Cheers, Don.

Ironhead · Post by **Ironhead** » Tue Jul 14, 2009 9:51 pm

Thanks for that Don, Wait till I tell the Keeper of the Purse ?
Alex.