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D1 rebuilt engine absolutely refuses to start
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Jack W
East Sussex
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July 31, 2020 - 2:09 pm
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Hello everyone!

i have a 1953 d1 with Lucas ignition, which will not start.

I have meticulously rebuilt the engine with new piston, rings, seals, crank bearings as well as a full crank shaft rebuild done by alpha bearings.

Timing is correct with a big blue spark outside of cylinder, the plug is wet with plenty of compression but just won’t fire! 

I’m thinking it’s not sparking inside the cylinder. I’ve tried 3 spark plugs all gaped to 18 thou and reset the timing Half a dozen times but it just won’t fire.

it did fire and run for a few seconds But after this, nothing 

I think it’s the condenser and have order a new one but would like to know what else it could be

just passed my cbt and am desperate to get it on the road again! 

thanks 

Jack

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Stoo63
GLASGOW
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August 1, 2020 - 10:33 am
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HI Jack and welcome to the Forum. It's always good to post in"Introduce Yourself" first so we all have an idea of your experience etc and to let us know what other bike(s) you may have 🙂

You will find just about everything you could ever want on the Forum via the FAQs and technical sections;  ** Please log in to view **

Have a really good nose around the forum and enjoy yourself. Looking forward to seeing your progress.

Good Luck!

All the best,

Stewart

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

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Jack W
East Sussex
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August 1, 2020 - 12:34 pm
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Thanks for the welcome Stewart 

I have now posted a little introduction.

i have looked all over the internet and had no luck what’s so ever. So please help me get it going again.

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cocorico
Central France
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August 1, 2020 - 12:57 pm
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The fact you have a good spark implies (to me) that the capacitor is OK. Have you set the timing with the head off, or just by ensuring the cam & flywheel keys are in? It is possible for the crankshaft to be displaced a little, which affects timing (see numerous posts about it). If you measure the timing (4mm BTDC IIR) and ensure the points are just opening at that point you should be OK. If not, try leaving the cam key out and moving the cam to the right spot.

I am assuming here that the Lucas ignition is similar enough to Wipac - if not someone will correct us.

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Unitminor
Norfolk
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August 1, 2020 - 1:11 pm
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Have you got a colour tune plug as that will let you know if it is sparking under compression . My mate had problems with a Velo several years ago and much time was wasted trying to work out what was going wrong. till we put the colour tune  in then it turned out as soon as it got hot the mag stopped working . Not quite the same as a bantam but it does let you see what is going on inside the engine plus could it be your plugs as I don't have much luck with ngk plugs I have more success with champion. 

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Jack W
East Sussex
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August 1, 2020 - 1:19 pm
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Me and my dad set the timing so the points are just about to open 5/32” before top dead centre.

we did this with the head still on by rotating till top dead centre placing a paintbrush handle Down the spark plug hole and marking it. Then measuring 5/32” up from the mark then placing it back and rotating all the way round till the second mark lined up. I know it sounds crude but it does work, this is how we got it running originally before rebuild.

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Jack W
East Sussex
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August 1, 2020 - 1:32 pm
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Unitminor 

mate of mine is dropping a tune plug off when he’s got a moment.

what champion plug would you recommend?

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Atco
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August 1, 2020 - 1:58 pm
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Are you using fresh from the the petrol station fuel mix, fuel goes stale after a few months . What work have you done on the carb is the petrol tank got Nick rust in it to  block fuel flow

Malc

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Jack W
East Sussex
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August 1, 2020 - 2:15 pm
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Atco 

fresh fuel 

tank sealed using slosh over a week ago 

carb cleaned out 

New fuel filter

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Unitminor
Norfolk
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August 1, 2020 - 4:28 pm
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I have a champion  L82C in my D3 andD7 from the bsa owners book  they list champion L7  (which i believe to be obsalete now )  . There is nothing wrong with youseing a length of wood to get the point of the points opening I would suspect many of us have been doing it that way for years . As for petrol I use Esso super which in my area ie ethanol free and as such up to now have not had the problems with it going off .

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JustinW
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August 1, 2020 - 5:36 pm
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Check that the metal post that the points sit on is not loose. If it is, pull it out, clean and use loctite to fix. If this post is loose it plays havoc with timing.

This is a problem with the Wipacs, maybe doesn't apply to Lucas?

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Jack W
East Sussex
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August 1, 2020 - 5:43 pm
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Thanks to everyone for the help.

turns out it was the suppressor cap. Sorry for wasting time.

thanks again 

jack

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Number6
Lincolnshire
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August 1, 2020 - 6:19 pm
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Plug cap? Not really a waste of time if it shows what else can go wrong. laugh

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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