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red D7 nearly finished but more woe!
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David Dale
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October 21, 2011 - 10:52 am
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Hello all, just thought I'd share my last few probs with the red D7, seems that I've read about others with some of the same ones on old forum, but at least one is new, to me! First and main one is a hell of a kick back when trying to start engine. It's so bad that it kicks back on every single attempt to start, I got three really bad (or good?) wallops on my right ankle area the other day that left me hopping around like a demented kangaroo, cursing everything Bantam, heads popped out of another shed nearby!

I have moved the stator plate around anti clockwise as far as it will go, opened up plug gap to 25 thou, opened up points gap to 18 thou, changed the timing cam to one with a different dwell angle all to no avail. the only way I can now start it is with the heel of my shoe on the edge of the rubber with a fleeting quick push rather than a full bloodied (!) kick. just cannot seem to get spark to occur any later, moving the stator plate to half way means no firing of engine at all.

Second fault is main headlight, or lack of it. new wiring rules out that. Have tried two alternative switches, bending tangs on bayonet fitting back of bulb, tracing supply from generator ( about 13 volts ac) which doesn't make it past switch, don't want to hack new wiring to pieces again! When light works, it really does, it's a very bright white light, unheard of for a Bantam?

Thirdly, bike will not start or run on E or emergency position if switched over with engine running, which defeats the whole object of having it there? i know that there's a link between the 2 switches, could it be the ignition, and not the lights switch all along?have blown two new back light bulbs parking light filaments.

Fourthly, had a job fitting chain guard, did usual of taking off of nut and washer holding nearside rear shocker to get it in, managed to fit nut and bolt to mudguard fixing point, then had to bend things a bit to get front fixing on ally of engine, which left chain guard firmly wedged against thicker part of rear shocker when I got strength enough to finally force it together and get nut and washer back on! Back tyre is now rubbing on the mudguard! Helllllp!

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Cornish Rooster
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October 21, 2011 - 11:46 am
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David,

Bit of a collection of problems on your post ! first thing that springs to mind with regard to the blown bulbs is that I read recently (can't remember where but may find it later) that for the direct lighting Bantams you need a dip/ full beam switch that allows both headlamp filaments to be on whilst it is changing over or else the voltage surge cause the rear light bulb to blow.
Have you tried starting the bike with the throttle opened quite a bit ? seems to work on mine and prevents that kicking back.

Phil

BSA Bantam D1 "150" in use regularly often as general purpose transport, quite a few other bikes as well. Cornwall Area Rep. 

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David Dale
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October 22, 2011 - 5:00 pm
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Hello Phil, sorry no it's now battery/external dc coil set up, have tried your suggestion about opening up throttle a bit more, that and putting the proper reach spark plug back in does seem help thank you, regards, David.

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Cornish Rooster
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October 22, 2011 - 7:55 pm
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Any progress ? One thing for sure you are right about the lights with a 12 volt set up my D1 is actually ok to ride on unlit roads at night, keep meaning to get a halogen headlamp bulb though it's actually good enough with a standard bulb. One thing to think about is fitting a LED rear light fitting no more blown bulbs and the current draw is tiny, fitted the light board or LED light fitting to most of my stuff. Also on the lighting issues have you got a bog standard rectifier fitted or a combined regulator / rectifier ? As these modern combined jobs protect the battery and electrical system from over voltage and charging.
Are you trying to fit a pattern part chainguard ? If so I can understand as when I fitted a pattern one to my Starfire it involved use of a drill, angle grinder, hacksaw and file !!!!

Phil

BSA Bantam D1 "150" in use regularly often as general purpose transport, quite a few other bikes as well. Cornwall Area Rep. 

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davidwb
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October 23, 2011 - 10:47 am
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Hi David, You know how keen I am on geting the points gap right at exactly 15 thou. You may be one of the unlucky ones who has a combination of bits that mean you need to run with a much smaller gap. I have heard some people run with only 6 thou. This will retard the ignition significantly. I have found a change of plug to a proper Champion L7 has sweetened up the running too.

Una, my Dad's original 1949 D1.

Ariel 350 Red Hunter.

Moto Guzzi V7 Classic, for traveling to places a bit faster.

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David Dale
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October 28, 2011 - 10:21 pm
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Quote from davidwb on October 23, 2011, 10:47
Hi David, You know how keen I am on geting the points gap right at exactly 15 thou. You may be one of the unlucky ones who has a combination of bits that mean you need to run with a much smaller gap. I have heard some people run with only 6 thou. This will retard the ignition significantly. I have found a change of plug to a proper Champion L7 has sweetened up the running too.

Hello Davidwb, took your advice today and tried putting points gap to 10 thou, took quite a bit of kicking, but it did start up finally, and without kicking back once! Thank you for that pearl, we sometimes see these bits of advice times not thinking that they could apply to us I suppose.Seem to be getting more and more done slowly.

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