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BSA A50 ROYAL STAR 500cc VERTICAL OHV TWIN

Jul 5

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Saturday, July 05, 2008 12:51:34 PM  RssIcon

This bike was supplied virtually as a box of bits (see Pic 1 &2), with the brief to completely refurbish to the best possible standard.

This bike was supplied virtually as a box of bits (see Pic 1 &2), with the brief; to completely refurbish to the best possible standard.
Once again the photos never show enough detail as to the state of each bike, This bike for example had a great deal of rust and corrosion (see Pic 3), ill-fitted and missing parts.
The frame was sand blasted, electro galvanised and spray painted with Hammerite paint (see Pic 4), so far the following refurbishments have been carried out:
Front & rear wheel rims re-chromed and new spokes and nipples fitted (see Pic 5,5A & 6)
Engine, new pistons, valve guides, main & small end bearings (see Pic 7)
Front & rear shocks (see Pic 4)
Headlight re-chromed (see Pic 7)

This bike build is still in process.

To view the gallery click here

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5 comment(s) so far...


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Re: BSA A50 ROYAL STAR 500cc VERTICAL OHV TWIN

Where do you find parts for the Royal Star. I purchased one and am looking for parts before I start the rebuild. thanks in advance for information that you may forward to me.

By rick on   Tuesday, December 07, 2010 7:27:37 PM
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Re: BSA A50 ROYAL STAR 500cc VERTICAL OHV TWIN

we have just stripped my 1962 a50 engine it seems it needs very little work there is no sign of wear in any part im not sure how many miles it has done but i have owned it for 26 years ithas been off road for 20 of them and i am now restoring it shes about half done

By TERRY KELLEY on   Saturday, May 21, 2011 9:30:21 AM
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Re: BSA A50 ROYAL STAR 500cc VERTICAL OHV TWIN

Hi Terry Its great to hear that you are keeping the old bikes going, the main thing is to check the oilseals as standing for so long they go hard, also you should have the bore honed and if possible put in new rings otherwise it WILL smoke. If you need any direct help you can always email me

By Len Harrison on   Friday, July 29, 2011 2:58:22 PM
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Re: BSA A50 ROYAL STAR 500cc VERTICAL OHV TWIN

what oil do you use on clutch side chain it states in the book sae 20 all i can find is sae 20w
regards Mick

By mick latham on   Wednesday, May 01, 2013 4:53:05 AM
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Re: BSA A50 ROYAL STAR 500cc VERTICAL OHV TWIN

I use the same as for the engine, Catrol GTX 20W-50. Do not use a single high viscosity oil as it could make the clutch sticky.

By Len Harrison on   Wednesday, May 01, 2013 10:53:46 AM

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