1981 Kz650 head questions

jeffo wrote: I thought I saw someone that did the 750 block with the 650 head.

www.kzrider.com/forum/2-engine/559505-kz...l=component&type=raw

Looks like it was a success. I will upload a bunch of photos of my 750 block and pistons when it comes. I want to see if there appears to be any issues before moving forward. The block I purchased is from a 1983 Kawasaki KZ750N. The only thing I will have to figure out if its in good shape is how to remove the paint.

In the link I see that the person used a KZ650 head on the KZ750 block, but I do not see anything that says he installed KZ750 valves in that head. He simply lapped the KZ650 valves. Did I miss something? Ed

That is correct --- he used the stock 82 650 cylinder head & valves.

I am just doing the block and pistons. I don't plane on doing anything with the valves unless there is a problem. Might just go with the 750 head if I have issues with mine....

The 82 is pretty much the same as the 81 engine wise.

On this rather than trusting internet forums, on a head which may have been skimmed and maybe uncertainty on eactly what parts you are using together i'd check the clearances manually.

Between the years there were differences in cam lift, duation, lobe centres and base circle mm, valve size and CR-maybe even valve angle differences as on the late big GPz's. To allow for this different piston part part numbers may be different valve pocket details.

I've done quite a lot of mix and match on 550's but checking clearances with plasticine is what I do. time consuming I know but the only way to sure.

if the 750 head and block with pistons and cams gets used together then probably ok. I'd think using the smaller 650 valves and milder cam you'll probably be ok, as the 750 would have I guess deeper valve pockets...but I'd check this carefully.

Ok. Engine block is here. Everything looks pretty good. The paint is in poor shape but I plan on removing it anyhow. I am a little confused. I thought when it came off a kz750 it said 749 on the block....mine says 819 also the Pistons say 819..... the Pistons were not marked for the cylinder they came out of. The rings look pretty good to me. What do you guys think?

Anyone? Bueller. BUELLER.

No eBay APP ID and/or Cert ID defined in Kunena configuration

Looks like a NOS piston shows the same.