All, Thanks for all of your input. Some fresh 30wt oil in the dashpots helped a lot. It still stumbles but not nearly as much. One of my books suggested that if you raise the dashpot piston manually 1/32" and the engine speed falls, that the mixture is too lean. Given that, both carbs are too lean. So the next step is to adjust them until they pass this test. But the plugs are tan/brown after a drive... sooty if it idles for a while.
Perhaps it is time to get an S.U. kit and a Unisyn. Or a Gunson Carbalancer. Their Clickadjust looks interesting too. Anyone tried these out? Thanks! Tim Benner 1965 MK2 -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] Sent: Monday, July 28, 2003 1:04 PM To: [EMAIL PROTECTED] Cc: Tim Benner Subject: Re: 1147cc tune-up carb problems Check your vacuum advance - the diaphragm may be shot in which case you're not getting enough advance when you jump on the pedal. Also - you can try power-timing - keep advancing the timing, test drive, listen for knocking, and then back off slightly from there. You can often run more advance than the manual indicates. If the vacuum advance is shot then advancing the timing will compensate for to some degree - i.e. better acceleration, but it will knock at high revs/load. ----------------------------------------- Date: Sun, 27 Jul 2003 09:43:23 -0400 From: "Tim Benner" <[EMAIL PROTECTED]> Subject: Re: 1147cc tune-up carb problems Thanks for all of your responses. It revs well from idle (no load). But this is just blipping the throttle... don't want to alienate the neighbors. Today I will: Change the dashpot oil (30 wt OK?) Recheck the timing. Drive it again and choke it when it stumbles. Order some float valves. After reading the Haynes and Clymer manuals last night the SU doesn't seem as intimidating. So I'll get out the spare pair and start cleaning them up. Any other recommendations? Thanks again! Tim Benner 1965 MK2 /// [EMAIL PROTECTED] mailing list /// Send admin requests to [EMAIL PROTECTED] /// or try http://www.team.net/cgi-bin/majorcool /// Archives at http://www.team.net/archive /// Send list postings to [EMAIL PROTECTED] /// Edit your replies! If they include this trailer, they will NOT be sent.
