[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [New Search]
While looking for intermittent rough running on my '71 Square twin carb, I decided after quite a few thousands of miles the plugs probably needed checking. Three came out fairly easily, but no.4 plug needed a lot of force, and successively undoing a bit then tightening a bit eventually did the trick. There was some galling on the innermost threads, but I ran the new plug in and out a couple of times with anti-seize on the thread and it seems OK. Having checked compression that one was actually the highest at 110, but no. 2 was down at 80, with the others at 100. That's with a cold engine (50F?) and not having run for a few days. I'm not too worried about the 80 - the engine has done 85,000 miles since new, including a lot of short journeys and some longer trips to Europe so it deserves an overhaul in the near future. I'll check the valves when it warms up again as it's below freezing here, but not much - I have my standards though. ;-) The new plugs made it a lot better, and now I've patched the biggest holes in the muffler it only pops a bit as it warms up. I found 3 faults on the carbs when removing them (makes getting at the plugs and compression checking easy!) - the RH choke flap was detached from the bi-metal spring (uh? how?), the LH had its electro-magnetic cut-off loose, and the choke flap screws were loose. Now I've got to re-balance the carbs again, but maybe I'll do a proper clean out first and set the chokes evenly - I think the starting mixture is over-rich on one carb at least. I don't think they've been looked at for six years or more, but maybe only about 20,000 miles covered in that time. The idling CO when warm was still at the 3% since adjusting it a few weeks ago, and it runs fine when warm, with plenty of acceleration (well, 0-60 in 20 seconds, or whatever is normal). BTW, There's nothing like convincing yourself by seeing it with your own eyes; timing mark is (maybe 1/4") to the right of the crankcase line for number 3cyl when spot on for number 1. Been meaning to try it for ages out of curiosity. Dave Hall. UK VW Type 3&4 Club www.hallvw.clara.co.uk ------- ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ List info at http://www.vwtype3.org/list | mailto:gregm@vwtype3.org