SOHC.co.uk Forums > CB350/400
Another restoration ready for the road
MrDavo:
What happens, do the plugs corrode in place and get stuck?
Thinking about it, it's very exposed to the weather, and that iffy mix of steel and alloy, coupled with not being disturbed for a long while if the bike isn't being used or maintained.
I've never had it happen, but I can see how it could. I don't want to contribute to sabotaging Eric's restoration thread, just interested in why this happens a lot.
hairygit:
--- Quote from: MrDavo on February 02, 2018, 05:19:44 PM ---What happens, do the plugs corrode in place and get stuck?
Thinking about it, it's very exposed to the weather, and that iffy mix of steel and alloy, coupled with not being disturbed for a long while if the bike isn't being used or maintained.
I've never had it happen, but I can see how it could. I don't want to contribute to sabotaging Eric's restoration thread, just interested in why this happens a lot.
--- End quote ---
It's called Electrolytic corrosion Trig, get it a lot on old Landrovers where the alloy body panels bolt to the chassis. Dissimilar metals + water, over time the steel rusts and the alloy dissolves to white powder. Obviously similar is happening to the heads of some old bikes, as you said, lack of maintainence is a major contribution to it.
Sent from my X6pro using Tapatalk
haynes66:
lovely job. nice to see another one back on the road
Laverda Dave:
Well done Eric, great looking resto and paintwork is stunning as is the whole bike. Summer is on its way :D
K2-K6:
--- Quote from: hairygit on February 02, 2018, 05:26:43 PM ---
--- Quote from: MrDavo on February 02, 2018, 05:19:44 PM ---What happens, do the plugs corrode in place and get stuck?
Thinking about it, it's very exposed to the weather, and that iffy mix of steel and alloy, coupled with not being disturbed for a long while if the bike isn't being used or maintained.
I've never had it happen, but I can see how it could. I don't want to contribute to sabotaging Eric's restoration thread, just interested in why this happens a lot.
--- End quote ---
It's called Electrolytic corrosion Trig, get it a lot on old Landrovers where the alloy body panels bolt to the chassis. Dissimilar metals + water, over time the steel rusts and the alloy dissolves to white powder. Obviously similar is happening to the heads of some old bikes, as you said, lack of maintainence is a major contribution to it.
Sent from my X6pro using Tapatalk
--- End quote ---
Galvanic corrosion is method by which the metals are partly dissolved. Each metal appears on the galvanic scale with a differential between them, the greater the difference, the more likely to corrode one component. Usually requires an electrolyte to get the reaction going. In most cases that's going to be salt water solution, so road salt in the rain is the normal culprit.
Can be protected against with another metal as sacrificial anode (think that's correct) so use of copperslip or similar can prevent the main components migrating.
Front brake caliper also subjected to the same.
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