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D7 not firing up
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Tezza175
Newark , Notts.
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June 12, 2019 - 10:29 pm
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Hi, I have a bantam d7 ( 1961 reg ).

The engine had not been started for quite some time maybe a year or more. As part of the refurb I fitted new electrics throughout. It has fired up twice , but on the 2nd start the engine raced rapidly causing me to turn off the ign switch.

I checked the throttle operation and think the cable caused the problem. Since then it has refused to start. So i then removed the monobloc carb for cleaning together with the throttle slide , needle ,throttle stop screw and air screw. I had already cleaned and refitted the float and valve in the chamber previously.

Although no other part was removed , I thoroughly cleaned the parts with clean petrol. I think as mentioned initially, it was the throttle cable sticking. The problem now i have refitted the carb is that it will not start or attempt to fire up.

I have checked the plug etc. But is there a procedure for resetting the basic jets and throttle screws after removal? Any advice would be appreciated.

Cheers

My d7 might be super one day !

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sunny
Norfolk
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June 13, 2019 - 8:10 am
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hi Terry     charge  up  the  batery      also  the  Monobloc  carb  has   TWO  very  Small  pasageways   one in  each  of  the  Two   body parts   thay  are  hard  to  see  &  clean     not  an  ezy  job    .   reset   the  carb  as  it  was  befor  cleaning    rember  bantams   donot   like   runing  on a weak  amount   of  petrol   and  usly  flud  after   3 kicks  

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cocorico
Central France
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June 13, 2019 - 9:52 am
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1956 D3 running, lights to sort. 7 other bikes in the Barn, 6 runners (when I get time!) and a still in progress Morini 250

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Tezza175
Newark , Notts.
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July 11, 2019 - 8:06 pm
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Hi, I own a bantam d7 (1961 model ) but it has the two switches on the nacelle. As previously mentioned, I have had starting issues for a while. It has run briefly , but my main concern is that it suddenly revs uncontrollably high. I have to turn off the ign switch before it self destructs !!. I have cleaned the carb and checked the electrics. I would appreciate any help as I wish to ride it asap. Thanks Terry

My d7 might be super one day !

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two-stroke
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July 11, 2019 - 8:44 pm
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over reving could be

weak mixture

loose slide

weak or wrong spring

air leak

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chickensoup
Bolton, Greater Manchester
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July 14, 2019 - 9:48 am
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Hi Tezza,

I agree, sticky throttle cable, Go back to the basic principals of an IC engine, suck squeeze bang blow. work through each one methodical. as long has you have a good spark some fuel and good compression you should get the engine to at least fire over a few times ( fart )

It so easy to convince yourself the problem is fuel related, when in reality, there is no spark.

Good luck with your starting problems, hang on in there because it will be something and nothing, like dirty points/ blocked jet. let us all know when you have resolved the problem....

1950 BSA D1 Plunger   242 UYW

1966 BSA D7  LBF 62 D

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Tezza175
Newark , Notts.
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July 14, 2019 - 10:23 am
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two-stroke said
over reving could be

weak mixture

loose slide

weak or wrong spring

air leak  

Hi, thanks for your advice. 

I wondered if it might be an air leak, but if the engine was warming up, that would be unlikely. 

I will reconsider taking the carb apart completely and make sure that the jets are not blocked etc..

Cheers Terry  

My d7 might be super one day !

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Tezza175
Newark , Notts.
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July 14, 2019 - 10:33 am
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chickensoup said
Hi Tezza,

I agree, sticky throttle cable, Go back to the basic principals of an IC engine, suck squeeze bang blow. work through each one methodical. as long has you have a good spark some fuel and good compression you should get the engine to at least fire over a few times ( fart )

It so easy to convince yourself the problem is fuel related, when in reality, there is no spark.

Good luck with your starting problems, hang on in there because it will be something and nothing, like dirty points/ blocked jet. let us all know when you have resolved the problem....  

Hi there, Heinz ?

Thanks for your suggestions re the basic checks. 

I replaced the ignition system a while back, but the spark sounds a logical first step.

If ok, I will restrip the carb completely and check the jets are clear etc..

I will leave a post when I get it resolved ( fingers crossed ).

Cheers Terry

My d7 might be super one day !

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