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September 28th, 2016, 05:36 PM   #21
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I Ride: 2006 FS650e, 2007 FE550e, 2016 Ktm500Exc
I also wanted to mention about gearing. I'm running 15/48 on the 550 as I had run on the 650 also.
I knew the 550 would be different with the same gearing but not as drastic as it is. I even thought there must be a 14 on the front so I checked. And it is a 15.
Especially on the street. The 550 blows through the first 3 gears and seems shorter for sure. When it gets into 4 through 6 it feels taller. But not down low. And 6th feels somewhere closer to 5th with the 650 than 6th.
In the dirt it all feels pretty good but shorter than the 650. I would say it feels like a 650 running 15/50 or 14/47. Somewhere around there.

So being as the 550 revs quicker, it really make a difference in gearing as its reved out earlier and wants you to shift.

And other comments?

Pollo
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April 20th, 2017, 09:36 AM   #22
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I Ride: 2014.5 KLR650,2002 Yamaha Road Star Warrior, 2002 TE570,1993 KX500, 1984 TT600, 1980 CB750F,
Are these bikes exactly the same except for the stroke? Same camshaft, carburetor etc. ?
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April 20th, 2017, 11:29 AM   #23
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I Ride: 2006 FS650e, 2007 FE550e, 2016 Ktm500Exc
I think the carbs are the same brucifer.
I have some time on the 550 now. 15/47 was exactly what I needed for the on/off switch feel.
The 650 torque lets you know whats up initially in comparison but look out for the 550 when its hammer time. Its a blast !!

pollo
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April 20th, 2017, 11:26 PM   #24
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I run 16/45 on my FE501 on the road and it tops out in 6th? what are the rest of you doing! dragging the brakes!

16/45 on the road and 13/48 green laning. I adjust the chain in about 1-minute flat now.

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April 21st, 2017, 04:40 AM   #25
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I Ride: 2006 FS650e, 2007 FE550e, 2016 Ktm500Exc
Im setting the 550 up with 17 inch wheels for street.
Im trying 15/38 first and see if it will work.
Im not sure if its going to be a little tall.
The Fs650 with 16/40 feels good.

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May 9th, 2017, 06:42 PM   #26
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I Ride: 2006 FS650e, 2007 FE550e, 2016 Ktm500Exc
My official Supermoto review .
I rode the FS650 and FS550 back to back today. The 650 geared at 16/40 and the 550
geared at 15/38. So close enough ratio with the 650 slightly taller at 2.5 to the 2.53.
Both bikes like their gearing.
Its a run for the money at the start with the 650 edging it off bottom until the 550 gains
on it and steps out with a massive blast in the middle. I cant say it's a lot faster there but
faster is what it feels like. And without the vibration.
The 650 is fun everywhere with its linear bottom to top thrust.
The 550 can be a handful off road with its race attitude ( depending on gearing too), but I think it really shines as a Supermoto.
Can't wait to get more time on it.

pollo
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May 11th, 2017, 06:14 AM   #27
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I Ride: 2006 FS650e, 2007 FE550e, 2016 Ktm500Exc
..and I guess in conclusion I was wondering how well the 550 was going to pull that gear. 15/38.
And it pulls it no problem with the full on HIT that it shows as an enduro.
Impressed. ..
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June 22nd, 2017, 01:40 AM   #28
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I Ride: 2008 450 FE Husaberg
Originally Posted by Md4stone View Post
It makes sense that the short stroke same bore engine will gain rpm faster, even at 87% of the capacity. The shorter distance the piston has to travel gets it back to the power stroke faster at any rpm. Should also be capable of much higher red line, given that other factors such as valve size and porting is equal. Which brings up an interesting aspect of all naturally aspirated engines:

Horsepower is a direct result of an engines ability to flow gasses through it, measured in cft/sec (cubic feet per second).



The higher this number is, the more hp will result. Has little to do with the displacement of an engine, other than larger displacement engines generally are able to flow more, as more cylinders are added etc. But the easiest way to gain horsepower is to increase the size of the carb or FI throttle bodies, enlarge the valves, enlarge, straighten, and polish the intake and exhaust ports, tune the exhaust manifold/pipes/silencer to "extract" exhaust gas.

Rev limits are a result of more factors than just piston speed in ft/sec, a lot of that has to do with the limits of any valve trains design. But with improvement in engineering an engine to be able to achieve higher rpm without valve float etc, an engine with the ability to flow "x" amount of gas with a smaller displacement will rev to the exact rpm where it is moving the same amount of gas through it that a larger displacement engine with the same ability to flow "x" amount of gas at lower rpm, and making maximum equal power at different rpm's. So if the 550 could rev about 1000-1500 rpm higher, it would probably make about the same max horsepower as the 628.

This should help to explain some of the reason why your 550 feels faster in certain regards. You would have to gear them exactly the same to get a real comparison though. The lower gearing of the 550 should give it an advantage until top speeds are reached. The 650 is making more hp because the rev limiter for both engines is the same.


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It's the rod to stroke ratio we have to look at, the stroke of a engine could be the same but the length of the con rod makes the difference felt as well.
So the same engine with a short rod and one with a long rod will perform differently.
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June 22nd, 2017, 01:46 AM   #29
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Originally Posted by pollo View Post
My official Supermoto review .
I rode the FS650 and FS550 back to back today. The 650 geared at 16/40 and the 550
geared at 15/38. So close enough ratio with the 650 slightly taller at 2.5 to the 2.53.
Both bikes like their gearing.
Its a run for the money at the start with the 650 edging it off bottom until the 550 gains
on it and steps out with a massive blast in the middle. I cant say it's a lot faster there but
faster is what it feels like. And without the vibration.
The 650 is fun everywhere with its linear bottom to top thrust.
The 550 can be a handful off road with its race attitude ( depending on gearing too), but I think it really shines as a Supermoto.
Can't wait to get more time on it.

pollo
I find that the 650 makes a difference when backing off the gas, as it feels like there is a heavy flywheel effect to the 550, 450.
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June 22nd, 2017, 05:34 AM   #30
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I Ride: 2006 FS650e, 2007 FE550e, 2016 Ktm500Exc
Bottom -------> 650
Middle --------> 550
Top -------------> 650
1/4 mile ------> 650
Although a whole lot can be done in the middle depending where you are...

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