Screw-pan Head,6x10 Kz200a1 1978 Canada

Cam-chain, guides & tensioner have to be in perfect operating condition, both for obtaining full performance and overall reliability.
An incorrectly tensioned chain means the valve timing will not be at its optimum, worn guides could allow the chain to jump, with the potential for catastrophic failure allowing valves to collide with the piston crown, effectively wrecking the engine.
All this can be avoided with timely servicing and/or replacement of the aforementioned components with new parts probably when the cam-chain itself needs replacing.
Related components you may wish to consider:

130Y0625
130BD0625
220B0610

Don't forget to order all the gaskets, seals 670B2021 and fasteners 112BA0630 required in one economical shipment?

Pro-workshop gasket sealant, 08C70K0234M to complete the job like a professional.