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Lay down gearbox

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Hi
I have a lay down gearbox in my 1956 Dominator 99. I rebuilt the gearbox and all gears selected no problem. On starting the bike I was unable to select first gear? When riding and going down the gears it goes in to 1st. Also when riding it doesn't want to go into 4th gear. There is no crunching noises it just won't select?
Any advise would be welcomed. 
Thanks

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Have you seen Mick Hemmings video? Sometimes the case needs easing to allow the selector free movement and not hit the case. 
Dan 

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My guess would be that the Gearchange Quadrant Arm is one tooth out in relation to engagement with the Camplate gear.
In the photos below check out number 50.
These photos are from the AMC box rebuild book but the LayDown box contains many similar parts.Gearbox Chunks

 



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