CRMotard Posted November 10, 2011 Report Share Posted November 10, 2011 Well I know what Im going to be buying myself as a graduation present in 12months time !!! (plus a motard kit) One piece crank cases rearward facing exhaust great suspension fuel injected http://twostrokemotocross.com/2011/11/ossa-250300-i-the-future-of-enduro/ Link to comment Share on other sites More sharing options...
CRMotard Posted November 10, 2011 Author Report Share Posted November 10, 2011 and images of this are presenting themselves online on various sites too... an injected Bimota BBX300 engine developed in house thats all I know about it Link to comment Share on other sites More sharing options...
crayons Posted November 10, 2011 Report Share Posted November 10, 2011 Those both look superb! Google fails me, is this like the bimoto vdue injection ? More pics on the ossa site. I'd never heard of them, it looks like they've not had a new bike since the 80s Link to comment Share on other sites More sharing options...
wazrs257 Posted November 10, 2011 Report Share Posted November 10, 2011 Its nice to see that someone's still developing strokers. A hell of a convoluted pipe on the Ossa though, still, saves it getting damaged by rocks kicked up by the front wheel. Can't remember which manufacturer it was, but "one piece cases"* have been tried before (70/80's I think), and never caught on. *one piece, except the big side cover that you remove in order to fit the crank/gearbox. Edited to add: It was the 1980 works Jawa 250 ISDT bike! Link to comment Share on other sites More sharing options...
mattyzx6r Posted November 10, 2011 Report Share Posted November 10, 2011 Its good to see Ossa adding to there range of one bike since there return. (the tr280i trials bike) Just as they announced there return the economy went to shit, so i thought they'd be gone again pretty quick since they didnt have a range of different types of bike to prop them up. If the enduro's anything like the tr280i aswell it will be very light. and sound like a angry 125 lol. Link to comment Share on other sites More sharing options...
wavydavy Posted November 10, 2011 Report Share Posted November 10, 2011 Hmmm... The injection uses crank and direct injection? So it's still a 'dirty' stroker unfortunately.. I take it it burns oil rather than running a 4T style 'clean' crank? Maybe next year... Its nice to see that someone's still developing strokers. Off-road bikes are exempt from Euro regs due to their small market penetration, so large(ish) capacitry 2Ts are still legal, no matter how 'dirty' they are. I hypothsised a while back on making a road bike akin to the Moto450 concept, but based on a 250-300c 2T enduro motor..... A hell of a convoluted pipe on the Ossa though I thought that too - can't quite make out the exact rout, but its bound to mess with the harmonics a bit as, IIRC, the straighter the expansion pipe the better (hence the TZR250 Reverse Cylinder, for example) as kinks upset the gas flow. That looks like a snail-shell! Link to comment Share on other sites More sharing options...
CRMotard Posted November 11, 2011 Author Report Share Posted November 11, 2011 doent really have many more bends than a generic two stroke MX pipe. header has a 90 degree bend, then a 180 degree bend, then a 90 degree bend. this has one large radius 360 degree bend (the loop), and one 90 degree bend out to the silencer only 1 more bend! Link to comment Share on other sites More sharing options...
2moto Posted November 11, 2011 Report Share Posted November 11, 2011 Like the Ossa! Nice packaging. Properly executed bends don't really affect performance, and those certainly look proper. The reverse cilnder/straight exhaust has more disadvantages than advantages, and no significant performance benefit. I'd love a go on that Ossa. Link to comment Share on other sites More sharing options...
wazrs257 Posted November 11, 2011 Report Share Posted November 11, 2011 I hypothsised a while back on making a road bike akin to the Moto450 concept, but based on a 250-300c 2T enduro motor..... They're great fun! Rotax 257 kart spec engine (similar to the Alfer 250SM/enduro) in an Aprilia RS125 chassis. 55-60bhp, just over 100kg! Having said that, I think it would be a lot more work if you were to use as much of the enduro bike chassis as (I think) the moto450 regs require. If I could find an Alfer 250 enduro at the right money, it would be staying as an off-roader. Link to comment Share on other sites More sharing options...
2T Institue Posted November 11, 2011 Report Share Posted November 11, 2011 The reverse cilnder/straight exhaust has more disadvantages than advantages, and no significant performance benefit. A long line of GP winners on the Aprilia RSW 125(and the 250)and back to the JJ Cobas/Rotax TB5 would disagree with that. Th Bimota is designated a BBX300 their model code gives the engine and frame origin DB-1, SB6, YB5 etc etc so very interesting Bimota has saw fit to develop their own engine.This engine is not fuel injected. Two strokes burn oil to remind the trailing 4T hacks what a real motorcycle is. Link to comment Share on other sites More sharing options...
wazrs257 Posted November 11, 2011 Report Share Posted November 11, 2011 A long line of GP winners on the Aprilia RSW 125(and the 250)and back to the JJ Cobas/Rotax TB5 would disagree with that. These are my thoughts on the matter too. Having said that, most (all?) of the front runners in what was the 125 GP class seem to be running 'forward' facing cylinders. The ones running rear facing cylinders seem to be futher down the pack, on slightly older bikes. Rear facing cylinders look cool though! I did this to my FS1E eons ago, and I was the coolest kid on the block! Link to comment Share on other sites More sharing options...
wavydavy Posted November 11, 2011 Report Share Posted November 11, 2011 doent really have many more bends than a generic two stroke MX pipe. header has a 90 degree bend, then a 180 degree bend, then a 90 degree bend. this has one large radius 360 degree bend (the loop), and one 90 degree bend out to the silencer only 1 more bend! Hadn't considered adding up the degrees on a standard off-road pipe and comparing it! But is there not another 90 degree bend on the header out of the exhaust port before the 360? As for straught pipes, I guess the main disadvantage is the length - if that pipe was straight it'd stick 2 feet out the back of the bike! Link to comment Share on other sites More sharing options...
2T Institue Posted November 11, 2011 Report Share Posted November 11, 2011 These are my thoughts on the matter too. Having said that, most (all?) of the front runners in what was the 125 GP class seem to be running 'forward' facing cylinders. The ones running rear facing cylinders seem to be futher down the pack, on slightly older bikes. Rear facing cylinders look cool though! I did this to my FS1E eons ago, and I was the coolest kid on the block! That is the diference between the older RSW and the later RSA motors. I asked Sandro Cortese at the GP which was better to ride. He said the RSA made better mid range but he said a well set up RSW is still a 'formidable bike'. It is well known that the RSA does not handle as good as the older RSW. The RSA tends to be further up because the best riders were riding them. Link to comment Share on other sites More sharing options...
CRMotard Posted November 12, 2011 Author Report Share Posted November 12, 2011 Also the RSA exhaust is only facing forwards because there is an even bigger advantage in having the disc valve away from the sides. so the disc valve gets to call 'shotgun' on the rear of the motor. cheers for the photo 2Ti, didnt know the Bimota was carbd. Link to comment Share on other sites More sharing options...
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