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Monobloc Madness
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stubaker58
Sunny Felixstowe
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November 24, 2020 - 9:57 pm
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So, I’ve rebuilt my motor after the escaped circlip situation and changed back to a Monobloc 375.  It all works, some fine tuning on the jetting needed but starts and runs well enough ... BUT ... when I tickle the carb petrol comes out of the holes in the inlet tract not out of the tickler itself.

Any thoughts?

D7/14 hybrid (4 speed with D7 crank etc.) on the road, D10 Bushman awaiting rebuilding.

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Lone Wolf
The Black Country
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November 25, 2020 - 12:37 am
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Wotcha.

Logically thinking . . .  are those holes lower than the tickler outlet ?

^..^

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Number6
Lincolnshire
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November 25, 2020 - 3:46 pm
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Should be a hole in the top of the float chamber somewhere. The same hole that air has to go in as the petrol is sucked out of the chamber. (Or holes, plural.) 

Got one with a blockage maybe?

Mike H --

Murphy's 4th law of motion states that any small object that is accidentally dropped will immediately hide itself under a larger object.

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sunny
Norfolk
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November 25, 2020 - 4:27 pm
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i  had  the  same  thing    i think  it  was  the  m/c  leaning  over  to much    so  i keep  them  as  close to  uprite  as  i  can   .,&   i donot hold  the pluger douwn   just  push  & back  up        the  375   not  ezy  & the  concentric s  are  moor stayble    in  that  way  

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stubaker58
Sunny Felixstowe
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November 25, 2020 - 7:22 pm
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Thanks guys,

I’ll check for a blocked hole. The inlet tract holes do seem to be below the tickler so I suppose flooding the fuel chamber will lead to an overflow somewhere.

The bike is on the centre stand Sunny, as level as I can get it.

Regards.

D7/14 hybrid (4 speed with D7 crank etc.) on the road, D10 Bushman awaiting rebuilding.

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cocorico
Central France
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November 25, 2020 - 9:12 pm
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As I understand it, the tickler is not designed to overflow the float chamber, just to allow a momentary flow of fuel to ensure that the mixture is richened in a similar way to closing the choke. So one small push and release should be all that is needed. That was the theory behind it 60 years ago anyway, as with all things Bantam, expect changes with increasing age and wear.

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Stoo63
GLASGOW
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November 25, 2020 - 9:59 pm
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There was a post quite recently advising not "tickling" the tickler but simply pressing it down until a very small amount of petrol comes out the hole. Since reading that, I've been employing the technique rather than thrashing away like a maniac at the tickler. It works fine and I can only assume will cause less wear over time. Don't know if ti will help this current issue but worth bearing in mind. The whole float/float valve area on the monobloc isn't the greatest design ever anyway. I had endless issues with my 5Ta's  375, replacing floats valves etc. I discovered that I'd been over zealous with the fibre washers and placed one between the carb body and needle seat which led to overflow problems. Can be bleedin' infuriating rantingHopefully, it's something simple and easily sorted out for you, Stu.

 '55 D3 Battery; '58 Square Four (project); '59 D1 direct lighting plunger; '59 Tiger Cub; '60 5TA;  '76 FS1-E; '91 GTR 1000;  '97 Honda Sky SGX50.

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