The engine was sometimes hesitating and misfiring when driving on bumpy roads so I figured the carbs was was the next thing to look into. They did look rather ok on the outside but as the car had only done 30,000 km's from '88 until I bought the it last spring I decided to take them apart.
Dismantling started off on our dining table, until the wife came home that is...
Took a whole day to clean out all the crap, especially to get those acc. pumps clean
Amazing what some vinegar can do
Got some cheap gasket kits off eBay, the idle mixture o-rings were too big so had to get some new ones locally, the gaskets for the housings needed quite some adjustment before fitting somewhat ok. The "actuating pin?" on the membranes was too long so it wasn't possible to adjust the acc.pump volume to more than 0.35-0.4ml. Note to self, don't get the cheapest kit out there
Fitted new ign. leads
Overhauled the carb linkage
Checked the valves
Checked the dwell which is jumping 3-4 deg when accelerating from 700 to 1500rpm. Is this normal or do I need to rebuild the distributor?
Set timing to 35 deg@6000rpm
Aimed with printouts of Gary71's excellent Zenith info
http://www.suggate.co.uk/index.htm MANY THANKS GARY! and a flow meter I got it running a lot sweeter than before and no more misfires on bumpy roads.
However, it has a slight hesitation when applying gas quickly below 3000rpm, possibly to too low acc. pump volume (or worn distributor...)?? It's also got a flat-spot around 5400 rpm...
Anyway, since above I've already managed to cover around 5000 km's this year
