salaam:
brother get your bike checked by any approved honda work-shop.
the problem could be due to clutch slippage, or too tight drive-chain adjustment, or seized wheel bearings, locking brake-shoes, weak ignition or incorrect ignition-timing, wrong size or choked jets in carburettor, choked exhaust muffler, bad spark-plug, leaky head-gasket, improper valve-tappet adjustment/clearance, weak piston rings, thick oil in crank-case, etc., etc.,... your honda mechanic will be able to filter the snag.
back in 1984, there was a decent honda outlet with competant staff at queens road, lhe. you may check it if it still exists... or any other with a good repo.
good luck!