SOHC.co.uk Forums > CB750

‘750 Start gremlin.

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Lobo:
If not run for 2+ weeks, the K2 will fire up on the button (full choke), but then quickly die - no amount of nursing it on the throttle will work. It’s as though the ignition has failed - which I am 99.9% certain isn’t the case. Typically after 3 or 4 similar such cycles we’ll be successful and get on the road.

Everything about this K2 has been fully restored in the last year, but tbh it did this occasionally before the major overhaul. Once running, the bike runs faultlessly.

Engine totally stock, carb settings by the book, plugs look OK. Boyer Electronic IGN, DR8-ESL plugs. (with resistive caps as unable to source non-resistor plugs). Basically, the bike is as showroom new in every aspect.

Martin6:
Do you keep the bike on a maintenance battery charger? Some electronic ignitions are finicky when voltage drops.

Trigger:
Wrong spark plugs and NGK are known to have a lot of copy plugs about. Try Denso plugs  ;)

Pauarc:
Which dense plug fit in place of the ngk

Nurse Julie:

--- Quote from: Pauarc on August 09, 2023, 07:27:40 PM ---Which dense plug fit in place of the ngk

--- End quote ---
Denso X24ES-U = NGK D8EA

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