SOHC.co.uk Forums > CB750
Chain lube, food for thought.
K2-K6:
In essence he doesn't cover many things that we would ordinarily consider the reasons for lubrication of a chain, heat build up, wear of bearings over duty cycle (elongation of chain) which is how most are judged because we have to adjust them, or any defects arising from siezed links (like trying to exceed the front sprocket diameter) which are particularly interesting for bikes in general but certainly of significant importance on these engines.
SteveD CB500K0:
--- Quote from: K2-K6 link=topic=18915.msg166499#msg166499 ---
If you don't lubricate the outside of sealed link chains they seem to heat up with friction during use, this may lead to the internal lubrication exiting the bearings. Something definitely happens as they can get stiff links that give problems.
--- End quote ---
I’ve always understood that chainlube is required in sealed link chains to keep the seals moist. If they dry out they get hot and deteriorate fast. Once the seals have gone the chain is toast pretty quickly.
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K2-K6:
It just looks like cod-technical presentation delivered to project the presenter in a light that he knows what he's talking about.
It starts with a theoretical view and just offers "evidence" to prove that, rather than examination to find what happens. They are different things.
Just that loading test of spinning the bearing, it reaches a demonstrated load of around 1 kilo (at which point it stops rotating), when if you look at a rough "back of a fag packet " approximation, it would probably exceed 400 kilo on a 200kg bike during maximum application of torque.
That test cannot come anywhere near simulation of real life. It's just not a valid test.
mike the bike:
It's only meant as a rough comparison,don't read too much into it.
K2-K6:
It's not a criticism of MarkCR750, just of the video maker and his assessment.
After all, if it can't stand up to a bit of gentle scrutiny then it's not worth the the altered magnetic state on which it's mpeg compression is stored (not worth the paper it's written on in old money) ;D
It's a classic con trick scenario, start by representing yourself with verifiable fact to establish credibility, move on to what you want to do when you think you're believed and present something as factual under that initial cover of truthful projection.
Not suggesting he's a con man, just the method has same fingerprint to it.
There's alot of good stuff available on t'internet, also alot of pure tosh, it's reasoned discussion that has the ability to separate the two, and perfectly valid on a forum.
What is his purpose of making and presenting something so ill researched?
In the context of the 750 motor at least, it's particularly relevant, as chain failure has the potential to take the crank cases with it.
As a one line statement and generalisation, I'd not run any chain without exterior lubricant, sealed or not. Preferably with a sticky/non fling consistency, ultimately with molybdenum disulphide as component.
And if that looks like chain lube, then I'd choose Kal-gard chain kote because I have tested on chains in real use with very good results.
Other products are available, and it taste's awful :)
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