2L cu Aircooled juddering HELP

[bri-on-1]

Hi all, I have rebuilt my top end and I am still getting juddering at any constant speed, even when I pull away I have to give it more revs than normal just to get going. This started even before I pulled the engine out for the rebuild. I have put on a new powerspark electronic svda dizzy and a new bosch coil. I have twin weber itc 34s and I have given them a good clean out yesterday but still have the juddering problem. I have changed the fuel pump and new fuel lines, new plugs & leads. I have checked for air leaks and all earth leads are good. This is set up at 7.5 btdc. Do you think this can be a carb problem? This is getting to me and I do feel like giving it all up. Just trying to get my bus ready for the summer. I do have the original carbs kicking around in my shed and was thinking of fitting them again just to see if it is the problem.

[sarran1955]

Hello,

Can you please describe this..'juddering..'

or even better do a video..

Cordialement..

[BOXY]

juddering at any constant speed

Are you sure it's engine related. Can you try rolling the van down a hill with the engine off to see if the juddering is a wheel / drive-shaft / brake problem? Just remember no engine equals no brake servo.

[dugcati]

plug leads are all on/on the right way?