SOHC.co.uk Forums > CB350/400

no power under load

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ricardo:
Hi all.
I hope that you are all well and loaded with tons of advice for me about this problem

After I bought the bike I noticed that revs needed to be well over 3.5k revs to get moving otherwise the engine stalled.
Since then I've refurbed the carbs. Then had that awful problem fitting the airbag back but just about managed. Then off road a while whilst I changed oil and filter.  Turned over yesterday and whilst I didn't ride it the engine sounded rough and wouldn't tick over at low revs. Needed 3 k or so to keep going.  After I refurbed the carbs I replaced ignition with electronic and cleaned plugs and checked that they sparked. They did.

While keeping the engine running at over 3k revs I removed the number 4 plug ht connector. No change in sound or rhythm of motor. Ergo no 4 Not firing??

I replaced and removed no 1 lead and the engine just spluttered to a stop.

Help. How should I proceed. I'l buy new plugs and check that they all spark. what then

Help

Ricardo

Nurse Julie:
Check to see if No 1 is firing also Ricardo, as 1 and 4 run off of the same coil. Is fuel getting to the carbs, is there enough fuel in tank, is the choke working and do you have lever in correct position. Check these for starters.

ricardo:
Ah Julie.

How pleasant to here from you.

Yes No 1 is working. Engine miss fires to the point of stopping when I unplug it.
Tank nearly full. Choke operates but not sure what you mean by correct position. I can turn choke off and engine runs but need plenty of juice.

Nurse Julie:
For cold starting the choke lever needs to be moved from the down position to the up position. You may not need full choke to start it.

Nurse Julie:
Just thinking, if you have refurbed carbs, have you reset air / fuel (mixture) screws out by 2 turns?. May not be spot on at this position but always a good start point.

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