Topic: CB400F Re jetting and carb sync but still running bad. Advise please.

[flybox1]

compression check measures the max pressure inside the cylinder as the piston is rising before the ex valve opens.
No/low pressure = no/weak bang bang

[Jimbo]

compression check measures the max pressure inside the cylinder as the piston is rising before the ex valve opens.
No/low pressure = no/weak bang bang

Got it...

Ill have to invest and check all cylinders

Stay tuned 

[flybox1]

Seeing your black plugs earlier makes me think compression is good enough. . .
IIWM, i'd verify all plug caps, connectors and plugs were getting juice and sparking properly, then ensure carbs setting on 1/4 are similar to 2/3.  Check for blockages.
Any chance pilot jets on 1/4 are of a different brand than 2/3?  overall length of the pilot jets the same? 
Go back and clear tube 1/4 to be sure....

[Jimbo]

Will do fly

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[Jimbo]

Hey guys just a quick update before i go to work

Put the needles back to stock today and ran the bike, cylinders 1,4 jumped into life as i reeved the hell out of it ?
did a plug chop and found that all my hard work getting them nice and chocolatey brown went down the toilet as they all came out rich and slightly carbon fouled (gutted). My plan tomorrow is to return them where they were and start again with dialling it all in hopefully 1,4 will fire so i can get them all up to scratch.

Ill keep you all posted