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Leader resto complete but alas a problem

Posted: Fri Dec 06, 2019 2:23 pm
by Anthony Woolhead
I completed the resto on the bike including new rings on the pistons, the bores were in very good shape. All this was achieved for just over a grand and around 600 pleasurable hours of graft. However, it proved to be extremely hard to start and would only run on a high throttle opening.

This prompted me to strip out the crankshaft and replace the main bearings, which were in surprisingly poor condition. I also replaced the oil seals.

Now the engine starts much more easily but will only run on choke. As soon as I attempt to push it in it stalls. The carb was meticulously cleaned during the resto and the tank went round in my cement mixer full of gravel, washed out and sealed.

Any ideas would be very welcome guys.

Tony

Re: Leader resto complete but alas a problem

Posted: Fri Dec 06, 2019 4:34 pm
by dave.owen
Did you changed the crankshaft oil seals.
If older they may be hard and letting air in


Dave

Re: Leader resto complete but alas a problem

Posted: Fri Dec 06, 2019 4:52 pm
by Anthony Woolhead
Thanks for your interest Dave, I changed the 2 centre seals and the offside seal. The nearside looked in very good order.

Tony

Re: Leader resto complete but alas a problem

Posted: Fri Dec 06, 2019 8:11 pm
by bh.sprint
Hello,

Just a thought -- Are the jets,slide and needle correct according to the book.

Brian H.

Re: Leader resto complete but alas a problem

Posted: Sat Dec 07, 2019 10:55 am
by Anthony Woolhead
Hi Brian, although I have cleaned the carb on several occasions I never checked the numbers, it will be my next step.

Tony.

Re: Leader resto complete but alas a problem

Posted: Sun Dec 08, 2019 7:25 pm
by bh.sprint
Hi,

I can't find any details in the manuals of the needle number/type but from a pencil note in my Amal booklet, the Leader has a B needle and the Sports Arrow ( 376 carb ) a C needle which I think is longer.

Brian H.