According to Clymer manual, valve clearance checks are called for every 6000 on a Gen 1, it should have had its 3rd check.
I'd submit it didn't. And further....I'd automatically check clearances on *any* bike "new to me", unless the prior owner could provide valid documentation it was done at a dealer, though I'd take his word on a DIY if he were a mechanical type.
As you are unable to document in any way, shape or form.....its an unknown if it was done at any time.....this bike is a perfect candidate for a clearance check.
A required valve clearance check comes within the territory of motorcycle ownership, whether it be Hon Zuk Kaw Yamacati.....it is important and can lead to engine degradation or even catastrophic failure if "blown off". Needless to say, myriad of different models/brands have differing valvetrains, mileage requirements. But come hell or high water, unless hydraulic lash adjusters are present, will require this vital service.
The EX exhaust valves, FYI, tend to tighten beyond specs in alarming short interval.
In your best interests, a service manual (Haynes, Clymer, factory) a great investment.
Custom Carb Service
**Being shot out of a cannon will always be better than being squeezed out of a tube. That is why God made fast motorcycles, Bubba.... Hunter S. Thompson**
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Last edited by ducatiman; 6-10-2019 at 4:26 PM.