Villiers Lightweight 515H difficulty starting!

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ChrisHGTV
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Villiers Lightweight 515H difficulty starting!

Hello all,

My first post as a member - I acquired a circa 1966 British Anzani Lawnrider from Clive (Many thanks Clive!) that I'm in the process of restoring/preserving.  It's a wonderful machine and so far enjoying the project, though I seem to be buying new tools for each operation at the moment!  
 

So my issue I wonder if anyone can advise on - the problematical engine.  So far I have thoroughly cleaned everything, new spark plug, electronic ignition, new carb float needle, the part the needle goes into, new air filter, gaskets, fresh oil etc.  I have had it running and it sounds fine but it's really reluctant to start.  The carb (b10/1) seems to have a tendency to flood with fuel leaking out of the strange brass "breather" in the bottom section.  I have the pilot screw adjusted as per the handbook two turns out from closed and holding the throttle open about 1/3.  I have a good spark, timing is fine, valves all move etc and it does run.  I'm assuming it's the carb that's the issue but at a loss what to look for or try next, any ideas?

Many thanks!

Chris

wristpin
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Joined: 23/05/2012 - 22:09
Two thoughts. You mention

Two thoughts. You mention “the valves moving” but did you have them out , check the condition of their faces , reface them and recut the seats - if necessary,  or at least lap them in and set the correct clearances?. Secondly, ignition timing. You mention electronic ignition and timing - is it an original electronic system or just an after market trigger unit replacing the contact breaker points and condenser?

I’m not aware that the Lightweight was ever fitted with an electronic / solid state system from new but if it has and follows the setup of other Villiers engines the timing is fixed so there’s nothing to be done there.  If it originally had points and condenser it’s wise to ensure that that the stator is positioned to give the correct timing before removing the points and condenser and installing the trigger module.

Either way, it’s my experience that electronic systems do require higher cranking rpm than points systems - good firm sharp pull from the compression point  - not a snatch.

Probably a good idea to eliminate the flooding  - perhaps lapping the float needle to its seat with some metal polish will settle it.

 

 

ChrisHGTV
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Thanks for the reply wristpin

Thanks for the reply wristpin.  Hmm I've not had the valves out, just inspected with the head off, as best as I could see with a torch.  Maybe I should give them a proper check etc as you suggest.  The electronic ignition is aftermarket from George at Villiers Parts.  He sent very clear instructions which I followed - so set to TDC both valves closed compression stroke and then line up the arrow on the flywheel to the mark on the casing at 12 o'clock.  So hopefully timing should be ok.

Ill have another look at the carb...

So, a couple of things to check - many thanks I'll report back!

wristpin
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That’s interesting as I wasn

That’s interesting as I wasn’t aware that there was an electronic stator available for the Lightweight. If it’s the “original” Villiers/Wipac unit my experience on other engines factory fitted with them from the outset  is that they do need a more determined pull over to fire them up than the same engine with the points system. 

When it comes to valves, I’m a great believer that to get the best out of an older engine, having the valves “ spot on” is time well spent compared with time wasted fiddling around with carburettion and timing on an engine that may be feeling it’s age. I learnt a lot many years ago from a man who would say “ remember VICTOR” - valves , ignition, carburettion  - in that order.