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Old 10-30-2012, 01:01 AM   #82
rununtilempty
690 rider
 
Joined: Sep 2011
Location: on the road and off, U.S.A.
Oddometer: 7
. . . and WHY are we trying to build an even heavier 690? Mine has an FMF system and with that alone makes nearly 70 hp . . . KTM makes hop-up kits which, when used in conjunction with each other, produce 80 or more. This can be seen most commonly with 690 Duke mods I have seen advertised . . . same LC4 engine . . . and I am NOT unhappy with the power from my bike.

I believe a twin would be fun in the 690's frame; however, the same output can be achieved with much less weight penalty. . . . imho

Great discussion though . . .
Quote:
Originally Posted by LukasM View Post
Lot's of discussion about this topic in the 1190 thread already, so in order not to derail it any more I'm starting a new thread.

Many of the "old school" 950/990 owners are claiming that this would be a useless exercise as you would just give up a lot of horsepower for only a couple of lbs of weight loss.

Well, I don't agree.

The weight difference between a 690 and a 990 (non ABS!) is around 140 lbs, with the engines accounting for around 40 lbs of that. Considering the smaller displacement and that manufacturing technologies have improved, a die cast 700-800cc twin engine should be at least 10 lbs lighter than the 990, probably more.

So you've got around 110 lbs difference after the engine, you don't think you can beef up a 690 chassis enough to deal with 80-90 horses and add a fairing and be left over with a significant portion of that? The 450RR rear tank that bolts to the 690 chassis is available already and weighs maybe 1 lb more, and with it's 18 liters of fuel will give you better range than a 990 has.

And don't forget that the 690 already has 48mm forks, 21"/18" wheels with Dirt Star rims, the same brakes as the 950SE and that the 690 rally replicas and even the factory LC4 rally bikes (some sporting a >80HP 730cc engine) run through the desert at up to 200 km/h for two weeks during the Dakar using that same trellis frame and I have never heard of anybody having problems, have you?

I think with some modern and creative engineering a 80-90 HP 700-800cc twin with 360-380lbs (wet no fuel) is a realistic goal, and I'd buy one tomorrow.


What do you guys think?
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