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No spark generated, sometimes..


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Enessr

 
Posts: 34
Joined: 16 Dec 2025

Location: Rome, Italy
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No spark generated, sometimes..

Fri Apr 17, 2026 7:42 am » Post: #1 » Download Post

Right then,
I've still got this bloody problem with something
causing a no spark situation but only sometimes..
I rigged up a Sealy spark tester on the bottom
cilinder so when the bike finally does start, I see
a constant, very brite continuous flow of currant.
I've checked the pick-ups, both are within specs
Ohm wise.
Battery holds 12v and generator kicks out a constant 14.5 Volt.
Petrol is always present in the recently fitted see thru
filter.
Kick the engine over and most times I get sparks, then then engine cuts out
and no spark generated, even after10/15 kick-starts.
Could a faulty pgm ecu cause this?
I Hope not as that means another €7/800 as spares
in Italy are unobtainable and there's always a risk
that the used pgm bought from Japan is also faulty..
Any way to check the dam pgm ecu?
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Zeus

 
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Joined: 26 Jan 2020

Location: Malvern , UK.
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Fri Apr 17, 2026 4:40 pm » Post: #2 » Download Post

It’s not a dodgy side stand switch is it?
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Andy
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Posts: 12109
Joined: 19 Jan 2004

Location: Devon, UK
1991 Honda NSR250 MC21
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Fri Apr 17, 2026 7:07 pm » Post: #3 » Download Post

Towards the bottom of the Workshop page on the main site, is a link to the Electrex Electrical Fault Finding Guide. Probably worth reading through it, as I know it has helped a number of people troubleshoot.

https://nsr-world.com/nsr250r-workshop/
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Enessr

 
Posts: 34
Joined: 16 Dec 2025

Location: Rome, Italy
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Sat Apr 18, 2026 11:46 am » Post: #4 » Download Post

Excellent Andy, thanks!
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