Volvo Owners Club Forum - View Single Post

Uplander · Apr 24th, 2018, 17:59

Hi

Having removed the air filter on my '69 1800S and intent on balancing the carbs (something I hadn't done properly on a previous visit) I noticed the rear carb was hissing more than it should while idling. I've discovered that when I start the engine the piston raises very slightly, just enough to see a bit of the needle. When I turn the engine off the piston drops. To be honest I'm not sure if this is correct or not, but the front carb doesn't do it and on idle you can't see that needle at all. So I suppose the question is which one is wrong, why is it doing that and how should I fix it?
Many thanks

Regards
Simon

PS I'm not a total SU novice, but neither am I an expert so please speak slowly.

Apr 24th, 2018, 17:59	#1
Uplander Member Last Online: Apr 16th, 2024 17:09 Join Date: Jul 2016 Location: Bridport	Carburettor issue Hi Having removed the air filter on my '69 1800S and intent on balancing the carbs (something I hadn't done properly on a previous visit) I noticed the rear carb was hissing more than it should while idling. I've discovered that when I start the engine the piston raises very slightly, just enough to see a bit of the needle. When I turn the engine off the piston drops. To be honest I'm not sure if this is correct or not, but the front carb doesn't do it and on idle you can't see that needle at all. So I suppose the question is which one is wrong, why is it doing that and how should I fix it? Many thanks Regards Simon PS I'm not a total SU novice, but neither am I an expert so please speak slowly.