1991 gsxr 750 engine rebuild

[Banditslingshot]

Hi has anyone any experience with rebuilding a gsxr 750 engine 1991 I've fitted new piston rings and lapped in all the valves fitted new stem oil seals and when running its abit smokey is this normal ?? When I've pulled the plugs they look fine how many miles do I run it in for ??

[Fazz711]

It could be just oil residue from the rebuild. How many miles since you did the rebuild? 

[Portaz13]

What were the bores like?  Did you hone them? 

[Banditslingshot]

The bores were good I did hone them I've done 20 miles since rebuild and smoked from the get go 

[coombehouse]

Why did you rebuild the motor? Was it smokey before. 

Only reason I ask is that if the bore & pistons had a lot of wear, replacing the rings is unlikely to fix it as oil control depends on a nice close running clearance between the piston & bore as well as good rings. 

[Banditslingshot]

It had stood for a long time without running so I was making sure it was good as I've never seen it run but the bore was well within tolerance the rings I used were oem parts they cost £££ as did all the other parts 

[Portaz13]

Is it possible there is left over oil in exhaust?  Run it at varied load for 100kms and see if I  clears up 

[Antman]

I wouldn't worry to much about the exhaust, as you've said the plugs look okay that's what I'd be looking at.

More than likely oil residue from the rebuild.