1.7 with Weber 34s - timing & running issues, Hard starts, sputters, backfires.... Options

[Boomingbeetle]

I recently got back into the 914 world with the purchase of a nice '71 with sideshift trans and a 1.7L, now I need some help and suggestions.... SO I have officially become a registered user instead of just lurking and searching.

My motor runs for the most part, but it had a hell of a time starting up after a week, and it does spit and sputter a bit. After getting it to my workshop I adjusted the valves, I replaced the cap and rotor which were badly corroded. Plugs are in great shape, gaps are good, but when I went to set timing I noticed the distributor pinion was 180-deg off and the #1 plug wire was actually pointed toward the #1 cylinder. I moved the pinion to the correct "12-degrees" at TDC and corrently arranged the wires. I could not get it to fire up. I had to leave until this weekend but when I went back I checked a few more items. The distributor is a 009 with electronic ignition, not sure what brand. Coil shows 4-Ohms and I have good 12V to the coil.

It started- but I had to baby it and hold the throttle until it was warmed up. Now I was finally able to check timing, but I cannot get it to rev to 3500 rpms. I can get to about 25-28 deg BTDC between 2500 and 3000, but it seems to fall flat and pop/sputter above 3000 and advancing the timing any further doesn't seem to make a difference. Weird because I was generally driving the car between 2500-4500 rpms before parking it to do this work. At first I thought there was a voltage drop at the ignition, now I'm beginning to think my carbs are not jetted correctly, but why could I drive it 70-80mph in midrange RPMs? Any ideas? I'll be heading back to the shop Friday to do some more troubleshooting but any feedback is appreciated. I can take pics if any further info is needed... Thanks!

[Boomingbeetle]

I had a very similar issue when I put Empi copies of the Weber 34 on my car. It did turn out to be a jetting issue. I'm not sure why you could get it to run over 3500 RPM before the work though. Maybe if the timing was retarded a little more before the work was done it would allow it to run better at midrange??? If I remember correctly your main jets take over from the idle circut around 3000 RPM.

mjrrti - the combination of retarded timing and small mains does make sense. Before this issue, I had to crank FOREVER to get the car to start up after it had been sitting more than a day. I was afraid the battery would die. I think the timing was retarded to the point where it wouldn't catch at low RPMs. Now that I have somewhat adjusted the timing, I can get it to start roughly. I just need to hold the throttle open partway until warm, but doing this doesn't rev the motor as high as it should go with my foot on the pedal. I need to dig up my syncro tool...

Suspect u have lean idle jets,you should have 50-55 in there or around that ,main jets should be 120-125,check for air leaks and make sure the dizzy is advancing properly which by the way isn't a great one for your motor
Good luck.

porschetub - I will check the mains this weekend and see what I actually have. I know the 009 isn't the preferred dizzy, but my options at the moment are the one that's in it with electronic ignition, another 009 I have laying around with points, or the stock unit currently sitting in a 2.0L bus motor core on my floor with points and vac advance (but I have no vac port).

Thank you all for your suggestions!