cancel
Showing results for 
Search instead for 
Did you mean: 
NaplesMGB
New Driver

MGB carbs

my 72 B runs great , but suddenly started running high rpm's at idle, 1700.  Checking the intake volume with a meter shows double the intake on the rear SU as compared to the front SU.  With the intake filters removed, you can see the rear SU piston riding higher than the front one, and manually can lower the piston to reduce rpm's.  Any thoughts?

2 REPLIES 2
Sajeev
Community Manager

Your diagnosis sounds spot on. I am no expert on SU carbs but I think this link will help: https://sucarb.co.uk/technical-h-type-carburetter-tuning-multi

MGB_Pumpkin
New Driver

Hi, may I suggest you join MGEXP.  I rebuilt an early 74 B and they have helped me a number of times. 

 

Regards

 

Tom