Dellorto idle speed too high.
Posted: Fri Jun 05, 2015 7:13 pm
Can't find an answer in the archives!
I have recently had my 40 DHLAs rebuilt and refurbished and they now look like new. I had new jets fitted to the spec in the Lotus manual (as a starting point). Dynamic timing set, new plugs, leads, dizzy cap, coil. Lumentition Optronic ignition.
I am going thro' the adjustment of the idle mixtures screws using the combined wisdom of The 'shop manual, Miles Wilkins TC book and Des Hamill's Dellorto book. My problem is that the idle speed is between 1200 and 1500 rpm. The lever is not touching the throttle stop screw, the throttle cable is not pulled tight so I'm stumped as to what is wrong.
If I apply pressure to the throttle lever, it is possible to slightly move the spindle and close the butterflies ever so slightly and decrease the tick-over a bit; however the combined springs do seem to be returning the spindle to their stop position, my applying pressure kind of feels like I'm forcing it a bit beyond. I've made sure that that one carb is not holding the other open by unscrewing the linkage adjuster.
Any ideas chaps? Am I missing the blindingly obvious?
Apart from this the motor seems to pull strongly, a very slight hesitation on opening the throttle sometimes but it is only slight. I've got a Gunson carb balancer and a couple of Colour Tunes, problem is I'm off to France for 3 weeks on Monday (not in the Elan!) so I will probably have to sort it out when we return..
I have recently had my 40 DHLAs rebuilt and refurbished and they now look like new. I had new jets fitted to the spec in the Lotus manual (as a starting point). Dynamic timing set, new plugs, leads, dizzy cap, coil. Lumentition Optronic ignition.
I am going thro' the adjustment of the idle mixtures screws using the combined wisdom of The 'shop manual, Miles Wilkins TC book and Des Hamill's Dellorto book. My problem is that the idle speed is between 1200 and 1500 rpm. The lever is not touching the throttle stop screw, the throttle cable is not pulled tight so I'm stumped as to what is wrong.
If I apply pressure to the throttle lever, it is possible to slightly move the spindle and close the butterflies ever so slightly and decrease the tick-over a bit; however the combined springs do seem to be returning the spindle to their stop position, my applying pressure kind of feels like I'm forcing it a bit beyond. I've made sure that that one carb is not holding the other open by unscrewing the linkage adjuster.
Any ideas chaps? Am I missing the blindingly obvious?
Apart from this the motor seems to pull strongly, a very slight hesitation on opening the throttle sometimes but it is only slight. I've got a Gunson carb balancer and a couple of Colour Tunes, problem is I'm off to France for 3 weeks on Monday (not in the Elan!) so I will probably have to sort it out when we return..