Suzuki Club UK

I have a 1990 SJ413,
After deceleration, blows blue smoke on acceleration, normally when hot.
Recently reground valves and replaced stem seals, replaced carb(just in case) checked mixture/timing / emission etc, no joy.
driving me mad. Help!

Des

Done a compression test? Could be some worn piston rings or bent rod.

Thanks. Next thing to check.
Des