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sidevalve5Many thanks for the replies. My old Trusty Jap 5 has now done its time, the transmission is worn out. Had rebuilt the engine and it was working very well before the transmission system broke. Have a Clifford Mk1a, so am going to put the engine on that and scrap the Trusty. The Jap 6 Trusty has a graunching sound from the very slack primary chain hitting the casing. Had this problem before so at the weekend am going to see if a half link will fit. Put some new clutch springs available at the club shop on my old Trusty, they made a big improvement. So at the weekend, if the Jap 6 clutch shoes have less resistance that the Jap 5 one, will take them off and fit them on the more recent machine. Will be saving the springs anyway, have two Douglas engine Trusty’s awaiting restoration.
The Jap 5 has the adjustable carb needle, so am going to put it on the Jap 6 and see how it goes. Have nothing to loose and can always return it back to the fixed jet. Many thanks for the offer David, but have a spare Zenith carbs with an adjustable needle. When I get round to restoring the Gravely D I might have a go at fitting a modern carb to it. Think the Zenith is too big so such a small slow reving engine. But thats for another day.
