Whizzing Sound Coming From Engine

[deeteefifty]

Sorry for my poor description guys, I will upload a video of the bike starting up from cold and hopefully it will show what I'm talking about, if however it is the cam chain/cam chain tensioner, if the cam chain is worn do I have to replace both the cam chain and the cam chain tensioner or just the cam chain itself?


Hope that question makes sense, I will upload a video of the bike starting up tomorrow.


Thanks for all your responses so far.

It's unlikely the tensioner is defective, it's at the rear of the cylinders under the carbs, loosen the centre nut but don't remove it yet, remove the two outer allen bolts, at this point mine needed a tap with a soft mallet to break it free from the gasket (order one in advance) the tensioner will spring out as a complete unit, now unscrew the big nut you loosened first carefully because the springs under it will still be in light tension. There's a spring loaded pawl on the end of the tensioner press it down and push the ratchet serrated shaft back to the body, this is now fully retracted, you can now place it back in the cylinder block, nip up the two allen bolts with gasket in place, then press the tensioner rod in till you feel it tension the chain, remove the Allen bolts and tensioner but don't touch the tensioner rod, once out count and note how many ratchet teeth are exposed then extend the rod to see how many teeth are remaining, if there's only a few, it's soon time for a chain. If the tensioner springs are broken or the pawl is faulty it needs repairing. Re assemble as if you were doing the measurement stage again, this time secure the Allen bolts properly, put the springs in, you'll hear the ratchet click up then put the top nut on and secure it. I did mine with carbs off so it could be twaty with them in place.
It's not as hard as the essay describes, words can paint a thousand pictures ?. There'll be a film about it somewhere.