EFI'd 4ts have weighed more, than their carb'd predecessors (other than Hondas CRF450R, I think), basically due to larger flywheels / stators, and the addition of fuel pumps, and other smaller items. The throttle body, and injector, would probably match the weight of an FCR carb, perhaps a poofteenth less.
In the pic Jeram put up, there's quite a few extra, small items, over a carb set up. I'd say there is a little bit more weight, than a carb, and fuel line, but, really, bugger all. Though, I have the feeling, that additions would be needed to the existing stator / ignition, and or a battery / condenser added? But, maybe not - I'm not particularly electronics literate, though I'll have to make an effort, sooner, rather than later.
Yep, Orbital have had stratified induction, by the balls, for years. They designed it, and perfected (well, it is ever changing ) it, so, they've a right to the patents, and licensing fees.
Athena's injector pointing 'up, into the combustion chamber', as I've written many times, is a beautifully elegant, simple way to DFI a 2t, using aspects of 2ts design, to reduce / eliminate the need for high pressures. That has been a big bug bear for 2t application. DFI, does not have to be in the, up till now, familiar / traditional, 'from above' format, well, not in a 2t, that's for sure.
The Ossas second injector, appears to be mounted much like the Athena set up. It's use of a case / inlet port / manifold mounted?, 1st injector, represents a very simple way of delivering oil to components that need oil. I'm sure, other designs will use different ways to do this - there are many, be it constant loss, as premixed bikes are, or simply routing oil through the mains, crank big end , little end (all, easily sealed) with perhaps a slight 'directed loss' to lube the cylinder / rings piston - though, of course, materials can be used that do not require lubrication from oil - fuel, can be all that's used, if anything.
Oil, is a relatively small part of the 2t pollution problem - unburnt fuel IS The Big Problem.
KTM, have consistently said, that their registrable bikes, will be the first 2ts to have "whatever" their solution they will use, to enable their 2ts pass the forthcoming Euro Emission rules. The MXers, are Not subject to the rules that 'on road vehicles ' are - but, they will eventually have it fitted.
2ts, if they are made as new engine modules, should not be any heavier - the 2t engines, currently in use, have had little effort put into them to make them lighter (barring the smaller top ends on KTMs). So, there is a bit of weight, that can be parred from the current 2t engines - with New engines.
Even without going for a lighter weight engine, with a YZ250 - just fitting the 4t swing arm, linkage, and, I think, shock, saves somewhere near 1.5 to 2.5 lbs. Purely, because, Yamaha have worked very hard, to reduce weight in the 250 F, and the 450Fs, whilst the YZ, has stayed the same, since 05 / 06.
So, DFI'd, EFi'd 2ts, really should not put any weight on. If they are done properly.
Far cleaner, far more fuel efficient - the 2 things 2ts , Have to become, to continue to exist.
