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A SORT OF NON BANTAM PROBLEM
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BASIL
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June 15, 2012 - 8:25 am
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Hi all, as some of you know I have a D10 sport with a Ariel arrow sport engine fitted, now the problem is it oils up the plug on the left hand cylinder and then only runs on one cylinder I have put on a new points back plate new points new condensers it started first kick ran for about a mile then went on to one cylinder again the left hand one oiling up again, I have to say the spark on the left side is not as good as the right but it seems to break down after about a mile could this be the coil or the plug leads? I know if I go and start it now it will run perfectly but break down after a mile or so. Any ideas appreciated regards Basil.dunno

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CharlieCeng
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June 15, 2012 - 8:29 am
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Could be the coil or the leads or the plug - they all affect each other when they start to breakdown. I would change the plug, then the leads, then the coil in that order. Are you running copper leads? Is the coil a modern one?

cheers for now,

Simon.

 

'42 Ariel W/NG, '58 Ariel Huntmaster, Masquerading D3, '51 Ariel Square Four Mk1 http://ariel-sq.....ogspot.com

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CharlieCeng
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June 15, 2012 - 8:30 am
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Is the plug heat range correct? and could that cylinder be a little poorly in the ring department?

cheers for now,

Simon.

 

'42 Ariel W/NG, '58 Ariel Huntmaster, Masquerading D3, '51 Ariel Square Four Mk1 http://ariel-sq.....ogspot.com

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Anderzander
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June 15, 2012 - 8:48 am
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I dont know much about these engines - but if the are timed the same on easy cylinder you could switch the plug caps over to see if the problem moves ?

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BASIL
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June 15, 2012 - 8:50 am
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Thanks Charlie, plugs are good have changed them will try changing the lead and coil, rings should be ok just had a rebore and new pistons infact its just had £870 put inside the engine and is not yet run in. Regards Basil.thumbs-up  

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BASIL
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June 15, 2012 - 8:54 am
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Not sure about the timeing Stephen but will try that at least it would eliminate a problem with the coil and lead. Regards Basil.thumbs-up

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BASIL
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June 15, 2012 - 11:57 am
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BASIL said
Not sure about the timeing Stephen but will try that at least it would eliminate a problem with the coil and lead. Regards Basil.thumbs-up

Just tried swapping plug leads got nothing at all so think I will try leads then coil. Regards Basil.dunno

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CharlieCeng
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June 15, 2012 - 12:52 pm
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What caps are you using Basil? I forgot that old chestnut! Suppressor caps should be ok with coil ignition but if the coil is tired then...unsure 

cheers for now,

Simon.

 

'42 Ariel W/NG, '58 Ariel Huntmaster, Masquerading D3, '51 Ariel Square Four Mk1 http://ariel-sq.....ogspot.com

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baker man
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June 15, 2012 - 3:42 pm
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Hi Basil, as you may remember i have one of these hybrid 'beasties', and my first thought was its the condenser, but as you have changed them i would suspect you have a coil brakeing down. fine when cold, but start playing up when warm. you probably know, but you car'nt  just swap the leads over as these bikes have 2 ignition circuits, one for each cylinder, .....cheers, martyn.thumbs-up

....D5..D7.......2X tiger cubs..2x 3ta..t120 bonnie..t140 bonnie..350 enfield..500 enfield..excelsior consort..bantam bleeder ( leader engine )

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BASIL
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June 15, 2012 - 6:01 pm
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Hi Martyn, have eliminated the coils by swapping them around I think it may have been a plug lead but it's just started raining so maybe test run tomorrow. Regards Basil.thumbs-up

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Doug Brown
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June 15, 2012 - 8:25 pm
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I hate to say it but it sounds more like compression to me. It just will not clean that plug if its not burning right.cant-look

Triumph Thunderbird 900 Yamaha rxs 100 and too many bantams !

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BASIL
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June 16, 2012 - 9:41 am
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Doug Brown said
I hate to say it but it sounds more like compression to me. It just will not clean that plug if its not burning right.cant-look

Hi Doug, it seems to have very good compresion on that cylinder but am just going to give it another test run. Regards Basil.thumbs-up

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edsboy
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June 16, 2012 - 6:44 pm
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Hi dont know if this helps but i recently had the same problem with a workmates arial leader. He has electronic ignition new leads plugs non supressor caps new coils etc he had the same problem A top end strip revealed gummed rings and severe blowby on one cyl. A set of new pistons glaze bust and rings sorted the problem. Also on his it was possible to put the throttle slide in incorrectly ! A new throttle needle and jet sorted a mid range rough running bought from burlen services off the shelf .. John

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CharlieCeng
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June 16, 2012 - 7:26 pm
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Did you do a compression test on the Leader?

cheers for now,

Simon.

 

'42 Ariel W/NG, '58 Ariel Huntmaster, Masquerading D3, '51 Ariel Square Four Mk1 http://ariel-sq.....ogspot.com

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edsboy
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June 16, 2012 - 7:55 pm
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No it was a last resort really it ran fine for a short while then went off on one cylinder and started smoking as sparks were fine had to be something else , the blowby was so bad i had to scrape carbon off to get at gudgeon pin circlips ...john

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CharlieCeng
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June 16, 2012 - 8:23 pm
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That's interesting. Why did you have to change the pistons?

cheers for now,

Simon.

 

'42 Ariel W/NG, '58 Ariel Huntmaster, Masquerading D3, '51 Ariel Square Four Mk1 http://ariel-sq.....ogspot.com

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edsboy
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June 16, 2012 - 8:36 pm
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No reason only that he wanted to replace them

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edsboy
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June 16, 2012 - 8:54 pm
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I think to repace the type of rings he had was £30 ish and the new pistons complete with rings and small end bushes he bought was a better option

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BASIL
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June 17, 2012 - 10:01 am
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Hi all, think I have found the problem one of the condensers seemed to be shorting on to the points cover which is a very close fit I am 95‰ certain that was the problem. Regards Basil.

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BASIL
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June 17, 2012 - 4:44 pm
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Hi all, have now insulated the inside of the timing cover its now running well, I am sure that the nuts on the condensers were touching the cover and earthing out such a stupid problem have changed pretty much everything for nothing hey ho thats life. Thanks for all the suggestions regards Basil.thumbs-up

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