the cb shop
help with my 1980 honda cb 750f looses power when riding then regains quickly?
here it goes when I ride my bike after say 10 minutes or 2 weeks without any problem it suddenly looses power it doesn’t shut down it just won’t get up and go it only lasts a few minutes or a day and the it’s fine sometimes it lurches back and forth quickly between the two. Heres what I’ve done so far:
Coils, plugs, wires, ignition packs checked all connections and had carbs redone twice does any one think it could be the pulse generator thats the only thing left I can think of and I’ve read in the shop manual its possible to clean and lubricate them but it doesn’t say what lube to use. Any other ideas are welcome as long as you don’t tell me to trash it
Check your engine breather pipes – If they become blocked or restricted it can cause these issues on any 4 stroke. Failing that it sounds like you have a dodgy connection to your CDI unit (I think that’s what you mean by ‘pulse generator’ as I’ve never come across this term).
If there was a fuelling issue chances are it wouldn’t present itself as an intermittant fault (blocked jets would cause poor performance all the time; worn slides etc would cause leaking through the overflow and balancing issues would just cause rough running).
Failing that you should do a compression test on all cylinders to make sure that the pistons/rings are all in workable condition as (without riding I don’t know for sure) but if the engine is only running on a couple of cylinders this would also cause loss of performance in the manner you describe.
I know this is going to sound like a cop out but without looking at the machine a loss of power could mean any one of a hundred things.
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