SOHC.co.uk Forums > CB350/400
Really bad cold starting. Ign or fuel?
Laverdaroo:
Not sure if it’s of any consequence but have you got good sparks at the plugs? I nipped off the first inch of the old leads and re attached the caps to a bike showing similar symptoms that I dragged out of a barn a couple of years ago, our 400F2.
I had done same as you and found similar results although I never ran it until hot, hot as it was only in the workshop but she was at operating temp. The old leads had just lost the poke and a bit of verdigris had crept up leads causing a crap or weaker spark. If you have the length, it’s a good tip to get a better zap out of the plugs.
Obvs if you’ve already done this then I’m sure somebody that actually knows stuff will be along soon to add something of relevance to your discussion
Hope that’s at least good for thought……
Scottish Badger:
Steve W, I'll try that in the morning and see if it makes any difference, thanks for the tip.
Roo, I have a big fat blue spark at all of the plugs, checked one at a time with the other three still fitted so the electrics were actually loaded up by the starter working against compression. Thanks for the tip about the leads though, I do have a spare set of new, unused coils that I may try (same as these, no idea of quality.. https://www.ebay.co.uk/itm/144813238373).
Laverdaroo:
Yeah sorry about that, I thought the post above was the first post. I’m in a travel lodge on a job and the Wi-Fi is awful. My bad
Just seen the rest of the posts as I went to the van for summut and put my hotspot thingy on and got some decent interweave .
Sent from my iPhone using Tapatalk
Oddjob:
How about plug caps, have they been changed. Once had one that failed when it got hot, possible I suppose for the opposite to happen. Or resistance in the caps may be too high at cold but ok when hot as it needs less spark to fire. Similarly resistance may be to low.
taysidedragon:
Have you double checked the fuel level in the float bowls. Could cause a problem.
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