Keep Dellorto DRLA 45s and Bosch 009? Options

[98101]

I suddenly find myself owning 1970 4-cylinder 2.4 with Web hot street Cam idles nicely and pulls hard at WOT. Part throttle response is not great, often with carbs coughing and even backfiring on trailing throttle. My use is mostly street, so I'd like to get this part throttle stuff sorted.

Here's pictures of the stuff that's in there now. I guess that's the infamous Bosch 009 with no vacuum advance and a PerTronix 1847A. The carbs are Dellorto DRLA 45s with short velocity stacks and these tall foam things that don't seal against the air cleaner housings. I'm willing to learn about the carbs but I don't have much confidence in the 009 for running nicely on the street. Please correct me if I'm wrong about any of this stuff.

Also from other threads I gather that switching to EFI such as MicroSquirt would cost $5K or so ... though I'm not ruling this out completely. Correct me if I'm wrong about that.






Is this kind of linkage OK?


Here's the idle you may have seen in another post:

https://www.youtube.com/watch?v=-AC53RRrXOU


Any help you can provide is appreciated!

--Michael in Seattle

[type2man]

Perhaps the allen screws backed off and the linkage arms moved? Also the linkage bar that goes across shouldn't move from carb to carb. It should have the smallest amount of play so it doesn't bind and it should not move up or down. At this point, I would either buy a new CB linkage or the CSP linkage and have a VW shop install it.

[98101]

Perhaps the allen screws backed off and the linkage arms moved? Also the linkage bar that goes across shouldn't move from carb to carb. It should have the smallest amount of play so it doesn't bind and it should not move up or down. At this point, I would either buy a new CB linkage or the CSP linkage and have a VW shop install it.

Some updates since the last post: Among my bicycle tools I found the allen wrench that would loosen the linkage arms. Both of them were locked down tight. However, moving the arms along the hex bar didn't seem to correct the angle discrepancy.




Also when I loosened the linkage arms, there seemed to be a spring missing from the right side end of the hex bar. Per the CB Performance book, there are supposed to be springs in both ends to keep the hex bar centered.

With family Christmas activities and every store being closed, I wasn't able to obtain carb or brake cleaner, so I blew out the idle jets using the Lewinsky method. It idles at 800 when it's cold and my subjective impression is that it's smooth at idle.

The good news is that tomorrow I have an appointment with a VW shop that was recommended by a local 914World member.

Merry Christmas all, and thanks for your continued help!