[nitronaf]

I street hooligan a 690SMC (654cc with evo2 upgrade) and race a FS570 with some decent parts on it (mostly handling mods but a few HP mods).
690 shits on the 570 when it comes to the street.
Even wheelies better, Faster in a straight line, servicing interval is huge, decent fuel range if youre not sportbike hunting!
Both are very reliable bikes dont get me wrong
Over 50,000km on the 690. No problems. Collecting parts for a 690cc rebuild though. 108hours on the berg and just a waterpump seal blew and clutch master cylinder seal leaked.

 

[nitronaf]

I really don't understand how the Husaberg fanboys keep saying it's a fast engine in the 570.
It isnt.
Quite slow actually, ESPECIALLY in the top end. Which so far a 44mm TB, Race cam, open air seat intake, DNA filter, Full Doma exhaust system and a JD tuner has made a little better but not fixed. 450s still walk right off on straights and corner exits when they start singing.

I have a HMC ported head and high comp piston waiting to go in once i rebuild the bottom end of the berg. I am HOPING this makes the engine at least a little bit scary and competitive...

Evo 2 690 topend rips it to pieces and somehow the gearbox just makes it even more better when compared to the weird 570 gear ratios (have a look at the difference between 5th and 6th gear). I would sell my 570 before my 690.

Still I love both bikes. Even considering race prepping the 690 for larger road racing events I race in due to its superior straight line grunt.
But hey, your money, your bike. Do whatever you want! Im sure youll have a blast regardless of choice.

 

[nitronaf]

@nitronaf lol why do you think nobody uses (nobody in pro league) a smc to race and win races? We got several pros and wins on these 70? Husabergs in the german championship. Supermoto isnt about the fastest bike, its about the most nimble, handy and good working bike. Try to whip a 690 in the dirt section on the sumo track, you will destroy yourself trying it. Its way more heavy etc. Of course a 450 cc MX bike revs up a lot quicker, but thats the difference between a 570 and a 450 MX. While the MX revs quicker, the 570 has a lot more torque! I dont think any 690 can keep up with a 570 on the track (when riddin by equal riders). But for street riding the 690 will be better, especially if you got wider, more open or quicker roads to ride. But the Husa will blast this thing on a REAL Supermoto track (70% asphalt + 30% dirt).

It will on this track. Which as I mentioned is A ROAD RACING EVENT.
I dont care for the opinion of someone who rode an older twin pipe nugget model that is heavier and less powerful than mine 'once' and thought it was slow.
I own both. I love both. I race. I track day. I street ride. I have spent many many hours riding both (and the fact that you disregard that is mind boggling).
When you see a 690R run a quarter mile vs a 570 then youll know exactly why I want to road race it in the 'Supermoto' class for the race day.
I clearly chose to race the 570 on real supermoto tracks with dirt for a reason buddy and not my 690.
Ride a 570 against a KTM505, or a HUSQ511(480cc) heck even an S2 MXV450. The 570 engine is a nugget engine wise

http://youtu.be/vHD09hxuV4I

 

[nitronaf]

Does your 690 stay with 600cc sportbikes up to about 80 MPH? Doubtful. Has your Husaberg's computer had it's fueling remapped? My 570 has the dealer-installed "akrapovic race map". With a slip-on muffler, air filter, and remap the bike puts out quite a bit more than stock. Plus my 570 is 60 pounds lighter than a stock 690. If you are not riding the 690 like a supermoto and instead are riding it like a tourer, then it's the better bike for that purpose. If you actually ride "supermoto-like" then there's no question the 570 is tops. I say "supermoto-like" because some folks only ride on the street but in an aggressive manner (when/where appropriate). I run a 45 tooth rear and 15 tooth countershaft (3.0:1 ratio) when I want to travel or otherwise put down miles. The bike rips with this gearing. Change the countershaft to a 14 tooth (3.21:1 ratio) and it accelerates even harder. I get an easy 110 mph with the 3.0:1 gearing. The stock KTM 450 SMR run 14 and 48 tooth chain wheels for a 3.43:1 ratio. I have yet to try it but will put on a 13 tooth to get to 3.46:1 ratio. I think 1st gear won't be of much use though.

I have something better than Akra map. Husaberg OST unlocked map with extended redline (the racing void your warranty map) and a JD tuner for fuel management....
My bike is quite far from stock and slightly more tuned than yours. The race cam and race mapping being one of the only mods that really woke it up which you do not have.
Most common gearing i run is 14/48 on the berg. 14/46 on the 690.
Also worth noting the 690 drops a shit tonne of weight when stock exhaust, air box and huge battery is replaced with an akra, a pod filter(evo 2) and a lithium battery. Doma full titanium system with a custom shortened muffler did not drop much weight nor did the tiny lithium battery on the 570.
And the FS570 some how with all its supermoto gear is claimed to be as light as the FE. Theres below 20kg difference in the bikes weights 690 vs 570. It is absolutely not 60 pounds lighter. It is closer to 40.
The final ratio of the gearbox isnt what is weird. It is the huge gap between 5th and 6th gear which I admit is actually a good thing on the street. Since 1st gear is useless even for race starts. You essentially have a 4speed gearbox when racing the bike.