SOHC.co.uk Forums > CB750

Engine case paint

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pae:

--- Quote from: UK Pete on April 05, 2010, 09:34:48 AM ---Hi PAE i have never seen a detachable lower frame tube before is it a home made thing?
Pete

--- End quote ---

No, as Andy120t says, it's a 650 thing. Damn good idea too.

Phil

SteveD CB500K0:
I'm sure there's a guy on sohc.net who modified his 750 to a detachable rail.

the-chauffeur:
Yup, it's one of the five or so different types of paint I've used.

The second question - is it any good - is much harder to answer.  Yes insofar as it's silver, heatproof and about the right colour for the 750 engine cases.  But - and it's a big but - even after I had the paint on my cases heat treated, it still isn't what I would call properly petrol-proof.  That said, none of the other paints I've used (inc. POR15 and some really hardcore stuff from Frosts) has been petrol-proof - and I think I've tried just about everything including solvent cleaning and bead blasting the cases before painting.

Having said that, the biggest area you need to worry about is the bottom end cases - the barrels/head are subjected to high temperatures pretty much all the time, so the paint seems quite hardy and stable on those areas (and as they're nowhere near the carbs, they tend to stay out of the way of petrol leaks).  The lower cases never really get very hot, and sit directly under the carbs, so the potential for disaster is quite high - the paint ran on the last set I did when one of the carbs leaked.  Consequently, although the stuff isn't heat proof, I reckon petrol resistant lacquer is the way to go on those lower cases.

Three other things I haven't tried - yet.  One is the wheel paint shown above.  The second is priming the bits with heat-resistant etch primer (if there is such a thing).  A third is two pack paint/lacquer.

sim2011:
Thx
I might try the Silver Simoniz VHT and also their petrol proof laquer
Simon

honda-san:
My ' 69 was painted with 5 wheel silver back in '94 when it was PROPER paint (you know, cellulose based and going to kill the planet). Colour was good, definately petrol resistant, and after 80,000 miles is still firmly attached and has not yellowed.
Sadly the modern Simoniz equivalent is not petrol proof the same. Like most things in modern life. New /  improved, but not a step forward in practical terms. Only way to work out whats best is to try them out on a test piece of some kind, cure in an oven at say 100

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