2.0 CU Carb Rough Running

[mojo175]

Hi people

I'm hoping somebody can help, I have a 2.0 CU with standard twin solex carbs that has started running rough. I noticed petrol leaking from what I thought was the carb top gasket so took off the air filter and ran the engine and found the choke flap jumping around a lot when I rev the engine and spitting fuel out the top of the carb!! I thought maybe it was an ignition problem so I have checked the ignition coil (bosch blue type so values of 3.0 ohms and 7.2 kOhms fine), can anyone suggest what to check next please?

Heres a small video of the issue: https://youtu.be/Iobdr-8CtFQ" onclick="window.open(this.href);return false;

Cheers and stay safe
Tony

[mojo175]

small video uploaded to youtube

[diesel11]

https://youtu.be/npz2E1C0KDU" onclick="window.open(this.href);return false;,
This looks the same as your issues, don't know if the replies help you any?

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[davidoft1]

check your valve clearances, check the carbs are balanced, check all the linkages are operating the carbs simultaneously and starting and finishing at the same throttle position

[sarran1955]

Hello,
Something like this....

Before:
https://www.youtube.com/watch?v=4qayyc9Z4E0" onclick="window.open(this.href);return false;

After
https://www.youtube.com/watch?v=dsfo5ATgBp0" onclick="window.open(this.href);return false;

A more in depth video..
https://www.youtube.com/watch?v=najLc9GlLJ0" onclick="window.open(this.href);return false;

When Corona lockdown permits I will be doing another tuning video with the CU engine I built up last Summer...

Air-Cooled Bliss..

Cordialement,

[diesel11]

Looking forward to another video, Sarran I've found them invaluable

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[sarran1955]

Hello,

Looking forward to another video, Sarran I've found them invaluable

Well thank you for that..

I have several videos to make, CU twin carbs to tune, Overhaul of a Pict 34-5, use type 3 (1970) inlet manifolds to fit twin solexes to a CT motor, CT crankcase rebuild, then the 'stroker' project.

So why don't I get on with them....

Because during lockdown, the bus is still in my workshop, with pop top fitting , new gas system for the cooker, and get ready for the VASP test.

So much to do ...so little time...

Cordialement,