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chippy
medway
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August 28, 2017 - 2:24 pm
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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 ?

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sunny
Norfolk
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August 28, 2017 - 6:34 pm
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hi   the  Monbloc  carb    fited   to  D  5 &7   has  the   only   high   needle  seting   4th  from   the   TOP   ok     

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nickjaxe
Runcorn Cheshire UK
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August 28, 2017 - 7:06 pm
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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

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jolon1
Leigh Lancashire
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August 29, 2017 - 9:53 am
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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

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sunny
Norfolk
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August 29, 2017 - 11:01 am
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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 

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jolon1
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August 29, 2017 - 12:13 pm
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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. dunno

D7 & D1 Racer

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chippy
medway
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August 30, 2017 - 9:57 am
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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. 

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sunny
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August 30, 2017 - 2:44 pm
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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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