Big end knock?

MikeM. · Post by **MikeM.** » Wed Apr 27, 2011 11:39 pm

Take care with the ignition too far advanced, you might finish up with a holed piston as I did some years ago.

g80csp11 · Post by **g80csp11** » Thu Apr 28, 2011 8:28 am

I spent years looking for the source of unusual 'knocking' under load only to find out it was gearbox mainshaft end play . shimmed up a couple of months ago and now everything is OK ( 1946 G80 with CP box )

rex.webb · Post by **rex.webb** » Thu Apr 28, 2011 10:30 am

Like us "Everything is Wearing" the bikes have been about a LONG ! time like some of us,
Have a GREAT WEEKEND With a TV or ON the BIKE.
Ride with Care and Live Long

zwarts · Post by **zwarts** » Thu Apr 28, 2011 2:14 pm

As has been pointed out many times before on this forum, the original ignition timing setting of 0.5 inch BTDC is too far advanced for the stuff that passes as petrol these days (unless you are fortunate enough to have a supply of leaded 4 star nearby). I cannot speak for the 350cc singles but the 500's are much happier at 7/16ths or even 3/8ths. BTDC on full advance. Of course you pay a price in loss of performance for this but the engine will feel happier.
Bob.

wilko · Post by **wilko** » Fri Apr 29, 2011 1:00 am

Speaking of endplay, have you checked your crank for this??

PDMiller799 · Post by **PDMiller799** » Sat Apr 30, 2011 11:36 pm

Must admit I haven't checked crank for end play recently. The last time I had the primary chaincase in bits as part of the latest attempt to stop it leaking I checked it and seem to remember it as being ok. The leak is tolerable just now but next time I have the outer case off I will check it properly.
My newly aquired G12 demands much of my time just now so the 18s has taken second place ( temporary ) in my affections. Maybe I should try golf. It wouldn't waken the neighbours or dribble oil on the drive

Malleon · Post by **Malleon** » Sun May 01, 2011 12:34 am

Maybe not , but golf is even more frustrating!