FJ600, YX600 cylinder head compatibility

Hi FJ folks!

I have a (best guess) 1986 YX600 engine in a pretty bad shape. Cylinder head might be recoverable, but camshafts are definitely done. I have looked around eBay and found:

• a few YX600 heads, no cams
• lots of FJ600 heads and cams (around 1984)

Would anybody happen to know, whether FJ600 and YX600 heads or at least valves and cams are compatible? I know they share gaskets and valve covers.

Thanks in advance!

 

Same part numbers for the heads so a good chance they are the same.
https://www.cmsnl.com/yamaha-yx600-radian-1989-k-usa_model9549/partslist/A-05.html#results
https://www.cmsnl.com/yamaha-fj600-1984-usa_model9022/partslist/A-05.html#results

 

It appears that the head is the same, as well as the exhaust camshaft. The intake camshaft is different (probably a slightly different profile) but since the basic head casting is the same, the cams will be interchangable. The FJ600 cam is probably a little bit more aggressive than the YX600 camshaft, but that's just a guess. Intake and exhaust valves and associated bits are all the same between FJ600 and YX600 engines.

 

Glad to hear that, this makes my rebuild much easier, many thanks!