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I’m thinking of the difference in cable routing and length between a LeMan and a Cali Vintage…wag
It may be any of the above , but , my personal experience with running 40mm Dellortos on my Le Mans 2after increasing the displacement to 992cc was that the light springs stated hanging up very frequently . Therewas no change in any thing ( cable routing , replacement , etc ) . Going larger simply overwhelmed the lightsprings ability to close the throttle with haste . Get yourself a twist assist and problem solved . They were a plastic paddle of sorts that mounted to the throttle and allowed you to rest the palm of your hand on the throttle and ease the load on your wrist ! Peter
I had a similar problem on my SP,it turned out that the throttle cable was starting to fray and was hanging up in the sheath when I wanted to slow down.A new cable solved the problem.
good point chuck....Huzo - really interesting stuff, thanks for chiming in... my thought processes have gone in that same direction. I have a go pro, maybe I could film the carb from air filter side and see whats happening. I can make it happen on the centre standa better way of describing it might be that it sticks open, imagine being in town 1st gear and when I'm about to change up to second I close the throttle but the engine stays at 4-5k without dropping
I've had light springs fitted to my LM2 carbs since about 2014. I also removed the bell crank lever return springs. So far not had any problems with this set up and the Venhill ptfe lined cables make the action nice and light.
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Just shows that there are several variables here; cables, carb wear etc.? because mine was hanging with the light springs, new cables and the bell crank springs still fitted.
Maybe the carb slides are worn, causing them to 'flutter? but it'd only done 12k miles so I'm not sure on that. It is now a 950cc, would any extra 'suction' be a a likely cause or is it the springs being different? FWIW, I bought the springs from Eurocarb (Dellorto UK) so I assume they are the correct parts...
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