1973tr6 Posted November 9, 2014 Report Share Posted November 9, 2014 I am looking for a way to restore the cylinder head on my 183 Sherpa 350 to the original look I.e. light grey as it cane from the factory and keep it that colour with something like a clearcoat. Any suggestions ? Quote Link to comment Share on other sites More sharing options...
guys Posted November 9, 2014 Report Share Posted November 9, 2014 I'm planning to do the same, but leave the surface untreated, because I'm afraid a clear coat might turn brown from the heat. As long as you don't ride in salty conditions, aluminium protects itself with a nice patina i.m.o. Quote Link to comment Share on other sites More sharing options...
lineaway Posted November 9, 2014 Report Share Posted November 9, 2014 Vapor blast! 1 Quote Link to comment Share on other sites More sharing options...
dadof2 Posted November 10, 2014 Report Share Posted November 10, 2014 Bead, vapor blast or acid clean. Coating will greatly reduce surfaces ability to transfer heat to air. Quote Link to comment Share on other sites More sharing options...
pschrauber Posted November 10, 2014 Report Share Posted November 10, 2014 I had a nice effect while blasting with glas perls, done before engine rebuild: 1 Quote Link to comment Share on other sites More sharing options...
tony27 Posted November 10, 2014 Report Share Posted November 10, 2014 Vapour blasting is the best way to get a finish exactly as it came out of the mould, I had the cylinder & head on my YZ465 done a couple of seasons ago & it still looks like new. Beadblasting leaves a surface that is very prone to showing fingerprints etc but vapour blasting doesn't seem to Quote Link to comment Share on other sites More sharing options...
bondy Posted November 10, 2014 Report Share Posted November 10, 2014 as said vapor blasting is the only way to go in my option i had a barrel beed blasted and way to harsh ended up painting it. i had another engine vapor blasted what a top job. hears a photo.am having another 1 done soon. Quote Link to comment Share on other sites More sharing options...
1973tr6 Posted November 11, 2014 Author Report Share Posted November 11, 2014 Thanks for the input. I have found a vapour blaster close to home and will take it there. The photo above is exactly what I am aiming for. Was the head steady painted or plated when new? Quote Link to comment Share on other sites More sharing options...
tyrefryer Posted November 11, 2014 Report Share Posted November 11, 2014 You can get the same results as vapour blasting by blasting with aluminium oxide and then blasting with glass beads, the aluminium oxide gives a clean matt finish ideal for painting but marks easily if left unpainted. The glass beads peen the surface to a silk finish that does not mark and can be left bare the same as vapour blasting. Vapour blasting uses glass beads but they are suspended in water, the only advantage of vapour blasting is that the item does not need to be degreased and cleaned as thoroughly so saves a lot of time in commercial application (but the setup cost is about £25,000). Use medium aluminium oxide and glass beads for sand cast items and fine for smooth or diecast items. Loads of useful info here http://angloscotabrasives.co.uk/ Quote Link to comment Share on other sites More sharing options...
bondy Posted November 11, 2014 Report Share Posted November 11, 2014 the headsteady above was painted in hammerite i have a new 1 think it's just steel i will have it semi bright nikel plated when i take some other bits there's a local place to me that does nikel plating. i will have a peice welded on the under side to strengthen it. Quote Link to comment Share on other sites More sharing options...
bondy Posted November 11, 2014 Report Share Posted November 11, 2014 both 250 and 350 headsteady Quote Link to comment Share on other sites More sharing options...
lbhbul Posted November 11, 2014 Report Share Posted November 11, 2014 Bondy, Nice pictures, we don't see hardly any B models around here let alone 198B don't think they were imported to the states. I guess the thing interesting is the apparent difference? Did the 198 s have a 64mm stroke? Help Larry Quote Link to comment Share on other sites More sharing options...
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