1923 4hp motorcycle

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g15mk11
Posts: 2
Joined: Thu Sep 22, 2016 9:14 pm

1923 4hp motorcycle

Post by g15mk11 » Fri May 12, 2017 4:28 pm

Hi does anyone have any ignition timing info on a rover 1923 500cc motorcycle

jp928
Posts: 67
Joined: Fri Aug 02, 2013 7:44 am

Re: 1923 4hp motorcycle

Post by jp928 » Mon Jul 03, 2017 9:26 am

I have a book on the 4hp engine, but its undated, so not sure if its relevant. It came from british-motorcycle-parts.com.
On timing its vague. Basically, there is a gauge rod lowered through where the compression lowering tap goes; set advance/retard to fully advanced; turn over until inlet valve is closed, and mark on gauge rod shows level with cylinder head boss; set magneto so points are about to open. Sounds like the gauge rod is needed. Another approach I have see is to set advance/retard to fully RETARDED at TDC.
hth
jp 26 Rover 9

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