SOHC.co.uk Forums > CB350/400

CB350F poor starter runs irratically

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Otis:
When I first got mine it ran but didn't feel right. Re did the tappets and carbs to no avail. Checked the electronic ignition and it was spot on.

By chance, a neighbour who knows a helluva lot more than me was assisting and felt something wasn't quite right with the ignition. We advanced the ignition a tad and the bike suddenly came alive.

Might be worth playing a bit?

Budgie955:
Timing is spot on
I've fitted new inlet rubbers and it's the same 1 and 2 running . 3 and 4 warm not hot
I pulled out no4 plug today and it runs on all 3   so no 4 is pulling it down . Carbs off again cleaned again , so I'm a bit baffled as to what is going on . Big fat spark and good compression on all 4 . Has to be carb issue surely??
Regards

Mikep328:
Did you perform the compression check?  Seems unlikely to be the problem but be good to rule it out.

Budgie955:
I did
All good at 135 psi ..pot 3  a little lower but the issue is no4 cylinder

K2-K6:

--- Quote from: Budgie955 on August 01, 2026, 12:01:38 PM ---Timing is spot on
I've fitted new inlet rubbers and it's the same 1 and 2 running . 3 and 4 warm not hot
I pulled out no4 plug today and it runs on all 3   so no 4 is pulling it down . Carbs off again cleaned again , so I'm a bit baffled as to what is going on . Big fat spark and good compression on all 4 . Has to be carb issue surely??
Regards

--- End quote ---

As a course reality check, you can introduce e-z-start via the sync port, you can use one of the screw in tubes from carb sync to squirt it in there.

All this does is introduce alternative fuel to that cylinder to see IF it fires competently with that. This is just to prove its fuel not ignition or other. Just a binary test.

Another test (if the above picks that cylinder up) is start from cold, run 20 seconds, switch off and then check the headers for temp to see if those stay cold.

The combination of, pick up with additional fuel & cold cylinder at start, almost confirms its back to looking at idle circuits again.

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