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Post by alanc on Sept 1, 2014 17:30:51 GMT
ok guys electrics are not my strong point
I'm getting power to the ht lead if i hold the end and kick the bike over i get a strong pulse of electric but only if im holding the throttle twist at the same time but still no spark at the plug it's a new plug. just put the engine into the frame yesterday as i'm doing a dry build of a 1970 sprint veloce. only connected the ignition lead from the stator. could it be shorting through the engine mount?
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Post by henri on Sept 1, 2014 18:43:06 GMT
you will get quite a "thrill" that way in ya hand,but dont mean stator is putting out enuff to give a spark or the coils good enuff ,what system have ya got on it ,6 volt ,12 volt upgrade or even smallframe lectronics, try holding end of ht lead 2-3mm from engine an kicking it over plug out ,no spark=coil or stator , or points gap to wide giving too large a dwell angle an no charge building in coil ,you say dry build ,is stater n points new or old 1's going back in ,i'd check the wiring an make sure its the ignition coils on stator connected not lighting coil, the coil is right voltage 1 for system 6v/12v an points gap an probably change the condenser . if above ya get a spark from lead , new ht cap n plug , its rare but they can come duff out the box, an also use insulation when holding lead ,as pulse is travelling across ya chest , luckily youve passed your cardiac fitness an epilepsy test, this time , nxt time might be a angel fixin ya scoot in heaven for ya , H
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Post by alanc on Sept 1, 2014 20:22:32 GMT
cheers henri its all old stuff just trying to get everything built and working before i paint the frame. it's 6v points at the moment but i do intend changing it to 12v electronic.
when you say hold ht lead 2-3 mm from engine is that with or without the plug in?
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Post by sbwnik on Sept 1, 2014 22:05:51 GMT
It can't make any difference whether the throttle is open or closed, it just doesn't work like that. Coincidence, that's all.
Other than that, what H said
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Post by henri on Sept 2, 2014 8:47:01 GMT
without plug , ya can spin it over faster then ,an as its 6volt points dont be expecting a massive spark at kickover speeds ,it helps to do it in shade not direct sunlight ,an a weak spark from lead is usually in order of checking ,1 wiring of stator,2 failing condenser,3 failing coil, 4 failing ignition coil on stator, you'll have to start at begining/simple an work through checking it , its why ya do a dry build so not having to do this later with fresh paint to damage, H
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Post by alanc on Sept 2, 2014 21:53:08 GMT
wayhay got loads of blue sparks re soldered some wires closed the points gap a bit and plenty of strong sparks
still not starting tho plug bone dry so no fuel getting through what next? strip carb?
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no spark
Sept 2, 2014 22:10:54 GMT
via mobile
Post by vespasco on Sept 2, 2014 22:10:54 GMT
For a quick start point, you can turn on fuel and unscrew the round carb float bowl top slightly. You should see fuel coming out if its getting that far. If so check your float is not stuck closed. Clear the jets and passageways. If no fuel in the float bowl work backwards from there, including the banjo (again, unscrewing it slightly with fuel on, fuel should spill out) to your fuel line/tap/ tank. Did you try it with the added fuel of the choke?
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Post by sbwnik on Sept 2, 2014 23:42:46 GMT
Do you have the air hose and filter on? On a borderline motor, having too much air can stop a cold engine from starting.
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Post by henri on Sept 3, 2014 8:42:34 GMT
to check easy thats its fuel n not timing ,spray easy start into it n kick, no pop=lectrics , popping =def fuel issues , an as its a build i bet ya needle valve is gummed in by old petrol varnish formed as carb dried out, if new spaco carb ,could be allsorts ,bad build,blocked drilling by casting muck, if stripping n cleaning ya carb dont buy carb cleaner ,get brake/clutch cleaner same solvent but a fiver a can cheaper ,an if carb is laquered/varnished, from old petrol ive been advised gt85 spray shifts it better than carb/clutch/brake cleaner ,like vespaco says check fuels gettin to carb ,you did turn on the tap eh, ive done it ,an like nik says try it with filter on ,an only blow cleaner or air through jets ,no bits of wire but soft bristles on paint brushes are ok, 99p store kiddies art supplys 20 various little brushes for 99p ,so cheap ya can use em once for rust cure/flux/glue/greasing an throw away an perfect for cleaning fiddly carb bits , H
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Post by alanc on Sept 5, 2014 20:47:30 GMT
hi guys
I'm now getting sparks and the plug is wet after a few kicks but still not starting? when kicking it, i get the occational pop and the kick start locks like it's about to backfire?
all help very much appreciated
ps when i take the plug out and kick it over I get what appears like fumes/vapor coming out of the top of the carb
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Post by alanc on Sept 15, 2014 21:02:21 GMT
two condensers new spark plug reset the points running sweet
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