« Reply #17 on: January 23, 2013, 09:41:25 am »
Hiya
What about rather than the fuel valve option, just replacing Bing for a Dellorto 22mm, no leaky float chamber and easy to find, saw an isetta fitted with one at the Uk national in Wiltshire 2011,owner said it ran great and when I got my Heinkel Ireland it came with one fitted, I think it maybe the future as they also fit them to Messerschmitts.
It could be the future! 
It is the future, but.... With the Messerschmitt we have had a car on a rolling road so as to set up the car with the correct jetting. So there is a tested solution for the Schmitt and it has demonstrated it works in use against standard cars of merit. As far as I know neither Isetta or Trienkel has been put onto a rolling road to optimize performance and with attention to using the correct venturi for various options. Until that is done all is guess work.
To illustrate I had a Goggo 300cc running a 250cc top end after a major failure at Story. This, two up with remains of dead engine and camping luggage managed to catch and pass several Dellorto carb Treinkels up hill after giving them a pretty good start. Amazing for the Goggo and shows their abilities. A Goggo 300 has about the same performance as a Schmitt. A well prepared Treinkel should leave a Schmitt for dead on a hill. I question if the 'good running' carbs were as good as the could have been. Now I am happy to accept that a Trienkel Bing is a nasty bit of design but less so for an Isetta. So I understand why folk do this mod. Why not go that bit further and spend about £600 of club funds to get the data to bring forth the maximum available from this modification for all? Ian Frankland has all the kit available. Then the clubs can sell a modification kit that is known to work for around £140/£160 on installation and all win.

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