Cylinder head swap?

[gch71]

Hello all, I've just acquired a 73' 75/5 that's been immobile since 1984...cylinder head has broken seized spark plug in it since 1984... I've got /6 cylinder heads...is it possible to do a simple swap, a plug and play deal? I've even got the /6 rocker arms with needle bearings. Is there any valve/piston clearance I've got to worry about? Thanks guys/gals...

 

[James.A]

I think you will be O.K.

 

[lkchris]

Goforit

 

[tattube]

Hello all, I've just acquired a 73' 75/5 that's been immobile since 1984...cylinder head has broken seized spark plug in it since 1984... I've got /6 cylinder heads...is it possible to do a simple swap, a plug and play deal? I've even got the /6 rocker arms with needle bearings. Is there any valve/piston clearance I've got to worry about? Thanks guys/gals...

You're not saying what size /6 engine the replacement heads are from.
If from a R60 or R75 you should have no problems.
If from a R90 you might have a problem with the larger valves wanting to nick the pistons.

 

[gch71]

I do apologize, the cylinder heads are all off of 750cc engines, just swapping the /5(messed up head) with a /6 head, and it will be both L/R sides for conformity. Right now i just want to get the bike running, once I have it up and running I'll dump some more $$$$$ into it. I had a spare set of heads laying around for a future project so it was an easy choice. The bike has been sitting since '84, fuel tank needs some serious help, carbs were completely solidified inside, the cylinders were ok, I just ran a hone through them, new rings and then cleaned up the heads, came out really nice....except the spark plug(what's left of it) was seized into the head, no amount of mouse milk, or other magic liquid helped not even heat. I'll just send them off later for overhaul. I have a spare fuel tank so I'll swap that for now. Thank you guys I appreciate the help... Now I have three airheads....why do I keep feeding my addiction?

 

[lmo1131]

Mouse Milk .. .. . I thought you were kidding. Never heard of it until now.

 

[gch71]

Mouse Milk .. .. . I thought you were kidding. Never heard of it until now.

Stuff does magic...but not when differential metals decided to weld together...IE spark plug in cylinder head