Dellorto blues, I've reached my limit Options

[barefoot]

For several years after After I but it all back together the car's been running fine, had to clean one carb once and that worked fine. Now it's getting worse won't idle, it just dies after I let off the throttle. Runs strong at higher loads but very poor at idle & low load. I've cleaned the carbs enough that think I could do it blindfolded. I know the points dwell is OK and I haven't touched the advance. Using a heat gun i can measure header pipe temps just before muffler and one cylinder on each bank is way lower temperature than it's neighbor after holding the rpm's just above idle speed.
Think I'll pull the carbs off and do a compression check just to rule out one thing.
Can't even do a synchronize without a smooth idle.
Is there someone in our group who is Dell 40 expert so i can send carbs off to ???
I've prided myself as a competent mechanic but this has got me on the edge.
Not having fun anymore (IMG:style_emoticons/default/headbang.gif)

Barefoot

[dr914@autoatlanta.com]

the most competent mechanic in the world cannot deal with dellorto carbs, real junk when they get old, can them and buy webers if you must have carbs, even the empi dual 40s are much better than the CRAP-D carbs

For several years after After I but it all back together the car's been running fine, had to clean one carb once and that worked fine. Now it's getting worse won't idle, it just dies after I let off the throttle. Runs strong at higher loads but very poor at idle & low load. I've cleaned the carbs enough that think I could do it blindfolded. I know the points dwell is OK and I haven't touched the advance. Using a heat gun i can measure header pipe temps just before muffler and one cylinder on each bank is way lower temperature than it's neighbor after holding the rpm's just above idle speed.
Think I'll pull the carbs off and do a compression check just to rule out one thing.
Can't even do a synchronize without a smooth idle.
Is there someone in our group who is Dell 40 expert so i can send carbs off to ???
I've prided myself as a competent mechanic but this has got me on the edge.
Not having fun anymore (IMG:style_emoticons/default/headbang.gif)

Barefoot

[Osnabruck914]

[quote name='dr914@autoatlanta.com' date='Jun 11 2025, 05:16 PM' post='3209842']
the most competent mechanic in the world cannot deal with dellorto carbs, real junk when they get old, can them and buy webers if you must have carbs, even the empi dual 40s are much better than the CRAP-D carbs


Gee, after such a convincing and "scientific" assessment of Dells, I guess I will have to immediately rip them out of my car- NOT!!!!! I find Dellortos extremely durable, reliably stable, and well designed, especially for changing out jets in situ.

Osnabruck914

[porschetub]

[quote name='Osnabruck914' date='Jun 13 2025, 04:27 AM' post='3209932']
[quote name='dr914@autoatlanta.com' date='Jun 11 2025, 05:16 PM' post='3209842']
the most competent mechanic in the world cannot deal with dellorto carbs, real junk when they get old, can them and buy webers if you must have carbs, even the empi dual 40s are much better than the CRAP-D carbs


Gee, after such a convincing and "scientific" assessment of Dells, I guess I will have to immediately rip them out of my car- NOT!!!!! I find Dellortos extremely durable, reliably stable, and well designed, especially for changing out jets in situ.

Osnabruck914
[/quote]
Yes (IMG:style_emoticons/default/agree.gif) , I have nice set just working on them now to finish refurb.
Bugger thought they were great as my last set were so easy to tune and my motor ran great , can't bin them as it was a customer motor that the new owner mentioned how well it ran after he recieved it.
I will bin the other set straight way ,seriously sounds like a random sweepings statement from George ...we already know he hates carbs but they have keep a lot of 914's on the road ....food for thought.