Kangaroo jumping

Can anyone help me. I have a Stigma 1.6 150 H.P engine in my caterham  and anything below 3000 r.p.m the car kangaroo jumps and the only way to stop it ,is to dip the clutch. I find it very difficult either driving through towns or in traffic. I have just had the carbs balanced but that has not stopped the jumping.

Comments

Hi, presume you mean throttle bodies, no carbs. I understand the 150 sigma is well know to run poorly on occasions, but yours must be something else, where are you based

Orange is my new black

Ballistic orange 310s

I am in East Sussex, small town called Uckfield.

Perhaps call up sevens and classics for help

Orange is my new black

Ballistic orange 310s

I have the same problem with my Sigma 125 engine. Just learned to manage it. I'd be interested in how you get on.

Hi, Same problem with a 2012 140hp Supersport. I was advised by someone who'd built a Blackbird powered 7 which had a ridiculously light throttle spring to increase the spring tension. I added another coil spring to the top of the throttle pedal and bingo, it reduced the kangarooing quite a bit. It's still there which you have to manage but it's much improved.