If it makes a knocking noise on full throttle (esp at lower revs)
then that is probably detonation (different to pre-ignition).
Try adding some 104+ and see if the problem dissappears.
Mike
-----Original Message-----
From: Andy Webster <trunkie@hotmail.com>
To: spridgets@autox.team.net <spridgets@autox.team.net>
Date: Saturday, 15 May 1999 23:49
Subject: success..I think...
>Performed my tune up last night as winter in Melbourne really began to make
>its prescence felt.
> When I first hooked up the timing light, I found the spark was at about
>20' ATDC, way retarded! Twisted the dizzy to get it in range then set point
>gap then fine tuned it to 8' with the little twisty-turny thing.
>Set mixtures at about 2 1/2 turns from top, did the lift piston
>test...cool...revs up...then down. 'Balanced' them as best I could and now
>it idles reasonably at 850-900rpm, low enough for the ignition light to be
>on. Anyway... took it for a fang today, and It's running the best it ever
>has. Pulls from 1500rpm and hits a real band at about 3000 up. However,when
>the revs are climbing, if I floor it theres a noise to it, that isn't there
>if I just open the throttle gradually, feeding it more as it needs it. Any
>ideas on this anybody? Its that preignition paranoia again..
>Turned the motor off at least ten times today/tonight and IT DIDN"T DIESEL
>EVEN ONCE....WOOHOO!
>Looking forward to doing a milage test.
>Thanks for advice
>Andy
>
>
>
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