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April 9, 2015
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Having got my D7 timing about right, I am now trying to get the carb set up right, with the needle in the 2nd from top grove the plug colour is mid brown, and in this position it 4 strokes ! I dropped the needle to the top slot and the plug changes to mid grey but the bike generally runs smoother and appears to have stopped the 4 stroking, it has the correct carb and jets etc and used but not worn out by any means, the engine has been rebored etc and crank overhauled. I am currently running the bike with a bell mouth on the carb with a built in mesh. Am I missing something or doing something wrong or is this what modern fuel does ?
January 9, 2013
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hi the Monbloc carb fited to D 5 &7 has the only high needle seting 4th from the TOP ok
February 24, 2015
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What part of the revs did it 4 stroke...best to be a tad rich than weak.
My B175 4 stroke a little bit sometimes but only at cruise speed...but I live with it know its safer for my piston.
Nick.
My Bantam video https://www.you.....jpOFmzRZRI
May 8, 2013
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sunny said
hi the Monbloc carb fited to D 5 &7 has the only high needle seting 4th from the TOP ok
Hi Sunny, According to Amal service sheet, a 1957-65 fitted with a 375/31 is position No.2.
D7 & D1 Racer
January 9, 2013
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hi Kingsly the last 4 words on my 510 s/sheet say ( D 5 and D 7 fourth ) on yours its missing i ges
May 8, 2013
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Hi Sunny, A bit conflicting isn't it? I got the info off, I think, in association with Burlen. Everything else on the sheet seemed correct for the carb, Main jet, Needle Jet, etc. I suppose the best bet is trial and error, to find out the best setting. 
D7 & D1 Racer
April 9, 2015
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Thanks for your replies gents, Sunny, I have read service sheet 510 and the way it's written appears a bit vague.
My Jeff Clew book shows that the D5 and D7 engine and carb data is identical, needle position " 2 " and also states counted from the top .
I'm sure that if I fitted my needle with the clip in 2nd from bottom it would be impossible to run, it was bad enough second from top but then I've probably got other things wrong, and that was what I was asking .
At the first oportunity I'll spend more time with it.
Nick, I take your point, that's what I'm afraid of , running it too weak.
January 9, 2013
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hi Eric i was a selfemplyed gasflow man after working a LOTUS cars and can tell you each monobloc carbureter would be set up with biger or smaller jets on the same D5 0r 7 engine ,,, books prited outside the indutry are to sell & make £ ,,, books from inside it like s/sheets are to save £ ,, and the 375 is NOT the best carb in the gallaxy and the hardest to cleane ,, any way well done with yours
hi Kingsley thank s for carb info as you can see its a lot of ges work reading between the lines thanks
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