Anyone know what causes this?...

[clarkeb]

Hi all,

Wondering if anyone knows what causes an oil like gunk buildup on the (I think) cylinder head casing? - see photo.
I viewed the bike yesterday and that was the only thing that raised an eyebrow.
Many thanks!

[Nobby the Bastard]

[clarkeb]

Thank you! That'd be a no for that one then! 😊

[grr666]

Plenty more fish and all that. Just find a better example.
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[clarkeb]

Yea, i did! Saw them both yesterday but that was the only thing I spotted really on that. The other only had a bit of paintwork around the handlebar so nothing mechanical! wanted to check!

[MarJay]

[RhynoCZ]

What oil do you run? Try thicker oil.
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'95 Mercedes-Benz w202 C200 CGI, '98 Mercedes-Benz w210 E200 Kompressor

[chris-red]

I'd say leaking Cam cover gasket, use it to haggle. On a bike like that it'll probably cost £10-20 and take about 30 minutes to replace.
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[Robby]

Or it could just be general grime caught up with the inevitable WD40 or ACF50 that has been sprayed on and around the engine. An air-cooled barrel is a pain in the arse to clean properly, in that you need to use something other than a sponge to do it.

[Johnnythefox]

anybody riding that bike without a Rainpal is risking certain death.

[RhynoCZ]

Also, how are your fork seals?
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'87 Honda XBR 500, '96 Kawasaki ZX7R P1, '90 Honda CB-1, '88 Kawasaki GPz550, MZ 150 ETZ
'95 Mercedes-Benz w202 C200 CGI, '98 Mercedes-Benz w210 E200 Kompressor

[MulberryWizar...]

Small oil leaks are common with CBF125s -- they are not built to last -- but you don't know how bad the leak is until you've owned it for a while.

Given that, the bike has very recently had a scrub, so you can only assume it's worse than it looks.

Avoid
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Ducati 749S '04 | Honda Blackbird '97 | Suzuki GSX600F '03 (sold) | Honda CB-1 '89 (sold) | Honda CBF125 '11 (sold)

[trevor saxe-coburg-gotha]

[Tracer1234]