Following rumors of Suzuki’s impending departure from MotoGP, many analysts believe GasGas is a prime candidate to join the premier class.
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This all gets very complicated. Apparently the satellite teams get funding from Dorna while factory teams don't, and adding one would reduce the pool of funds to the rest. But GasGas would functionally be a satellite team as well, unless they were to develop an entirely new bike, which is extremely unlikely. And if they were to call themselves a factory team but use the KTM as a base, there would be all sorts of issues around concessions, considering the established machinery.
Add that the KTM has serious issues, and the satellite team in particular has been absolutely nowhere over the past couple years. Last year it was assumed that Petrucci was past it and Lecuona never had it, but the vaunted pair coming out of Moto2 have picked up where they left off: out of the points. Granted, they're both rookies, but it's been a disappointing start by any standard.
Racing is a very expensive form of advertisement and Suzuki hasn't been investing anything into their street bikes in ages, so from a financial standpoint withdrawing from MotoGP makes a lot of sense.
Definitely less benefit if you never make new bikes with which to apply all the data you collect out of the racing crucible. What doesn't make sense is the timing, having just renewed various contracts etc.
I was about to make a snarky joke that the last significantly new street bike model that Suzuki produced was my 2004 VStrom 650. Except then I stopped and thought about it, and that statement might actually be close to true?!
In terms of new engineering, the VStrom had the SV650 engine and a new frame. I guess they introduced a new frame with the Gladius in 2009 (which is still used on today's SV650), and it looks like the GSR750 was introduced in 2011 (and is now the GSX-S750). All of those inherited engines from previous models that have otherwise had very few updates other than emissions compliance.
Suzuki motor histories:
Hayabusa: 1999
SV650/V-Strom 650: 1999
V-Strom 1050 (TL-1000 motor): 1997
DR-Z400: 2000
Various 750s (GSX-R750 motor): possibly 2006, though it's hard to tell how much of that engine is an evolution of previous 750's
Various 1000s (old GSX-R1000 motor): 2005
GSX-R1000: hard to know, last motor update was 2017, but it was essentially an evolved version of the 2005 motor changed for emissions
Not sure about the 125 motor or the various cruiser motors...
So the only possibly new motor is the Gixxer 1k (even that was a dud on release, coming in well down on power to the Aprilia and BMW, and slotting in with the Kawasaki and Yamaha as underdeveloped also-rans).
Ultimately, Suzuki stopped trying to make class-leading bikes around 2005/6, choosing instead to iterate existing models and compete on price. It makes a kind of sense, but definitely feels like a company with better things to do...