Just got a photo of the colour test block for the prototype blue 550 stacks. As I mentioned this set will be going on my 550 cafe to confirm fit and sizing. The standard kit will come with black stacks, with colour being an optional upgrade.
As well, after some discussions with ITG, the different filter height requirements of the 550 & 750 have been resolved. The alloy frame frame and back plate (with different hole size / position) will be the same for both applications. However, I will now be supplying two different filter heights. The 550 will be using a 45mm filter, and the 750 either a 50 or 55mm high filter. Terry will be receiving a couple of spacers so that he can let me know if there are any clearance issues going with 55mm. If the 55mm height checks out OK, this will open the door for use on carbs with a throat dia. greater than the stock 750 carbs (up to 45mm throat ID). That said, fitting to CR29's will require standard 550/750 carb spacing presently, as the limiting factor is the current filter frame width. It would also require CR29 specific 750 stacks. Which I haven't even started to look into.
Note - the 55mm filter will not fit the 500/550 unless the stacks are very short, because of the clearance issue with the rear frame rails. This would limit its use to racing applications only in my mind.
So bwaller
it still doesn't quite work for your racing application (straight manifolds with increased 2/3 carb spacing). There is a possible solution. However, as I already have waaay to many things on my plate presently, this will take a back seat for the present time.
So to summarize. The 500/550 filter height will be 45mm, for use with stock carbs. The 1st thing I will be asking Terry to do is check clearance with a 55mm filter height, and stock 750 carbs. If it is to tight, 50mm will be the 750 filter height. Once I have that answer, I will be posting pricing, asking for deposits, and placing my order for the 1st lot of filters with ITG. Terry will be, in the mean time, be doing jetting tests, with a 50mm filter height. The additional 5mm will not affect the results with stock 750 carbs. If the 55mm, fits it will allow me to develop a CR29 package for the 750 (
stock spacing), without having to carry a 3rd filter. This means the pricing for that application will be the same, or very close to the 500/550/750 filter kit pricing. Bonus.