My engine has got the ADHD!, Can't get my engine to idle at less that 1000 Options

[tornik550]

On my dual weber 44idf, 2258 engine- I cannot get my engine to idle at less than 1000 rpm. I have backed out both idle speed screws all the way. I unhooked the linkage. I played with the timing (which will slow it however it runs like crap). I adjusted the mixture. I even put new throttle plates in the carbs and synced them. I made sure the throttle shafts were not bent.

My old throttle plates were worn which I feel let too much air in. I replaced the plates with new ones which I thought would correct the problem. I was able to get the idle to go down from 1200 to 1000. I shined a light under the plate after installing them- I can see a very slight amount of light from between the plate and barrel wall.


Any ideas?

[cgnj]

Hi,

Intake air leak below the throttle plates or throttle plates not aligned in the bores properly.

Were you pulling the same amount of air when you reinstalled the carbs? Was the idle air way off? Did you pull the manifolds? If not the they should be ok. New base gaskets when you put the carbs back?

Getting the plates back in the bores and to work correctly is the hard part of the job. I ended up getting full motion of the shaft, then killing the lights, shining a light from the bottom of the bore, and confirming that the plate was square in the bore. With the idle screw all the way out, woun should see no light. You need to make sure the first progession port is covered by the plate. Swedge the the throttle plate screws, they will fall into the head. Ask how I know.

I contacted Art about a month ago about rebuilding my drla 45's. I heard his quote and decided to do it myself. Maybe the price for webers is less. Just need the throttle plates to come over from the Italy.


Hope this helps,

Carlos