SOHC.co.uk Forums > CB350/400

400/4 is popping & banging with poor mpg where to start?

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McCabe-Thiele (Ted):
This evening I fired up the 400 from cold I let it run at between 2- 2500rpm for some 20 seconds then checked the front pipes.

Number 1 & 3 cylinder are virtually cold - number 2 & 4 nice & hot.

So where do I start to diagnose what the problem(s) are please?

An Idiots guide if you will of the best logical steps I need to take in sequence please?

Oddjob:
Tap the float bowls Ted in case the floats are stuck shut.

K2-K6:
Also get the plugs out and post decent pictures of  them to help identify problem.

Are the 1+3 just wetted with little combustion?

McCabe-Thiele (Ted):
Yes I clearly need to remove the plugs & see what's going on with cylinders 1 & 3 thanks for the initial pointers.

Off to Wales for this weekend with a planned boat trip over the Pontcysyllite Aquaduct - bike will have to wait until Monday unless I can sneak the plugs out before we go.

I've only ever walked over the Aquaduct when I was a teenager in 1968 - it's just taken me a while to re-visit the marvelous piece of Telford engineering.

TrickyMicky:
Enjoy the aqueduct, Ted. It's quite an 'interesting' perspective if you admire the view from the West facing side, (not the towpath side!). Mike.

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