My bike (900ss engine) dynoed at 67.2 RWHP...should I be asking WTF?

[Rudemouthsky]

And that's why I run the gearing I do.

How does it behave around town with that setup?

[Dirty Duc]

How does it behave around town with that setup?

Much nicer.  I think I have slightly different gearing than your engine, but 1st feels like 1st instead of 2nd.  There is a speed limit or two that is right in between gears by my riding style.

The only thing that might be considered a drawback is that 80 on the clocks is around 5500rpm.  If that annoys you, you won't like it.

[brad black]

you need to find out what other bikes make on that dyno, or if you know someone with a similar bike have them run it and see.

what was the mixture like?  maybe you need to put the airbox back on.

[Speeddog]

My M750 squeezed ~58 RWHP about 6 months ago.

FP Jet Kit, Termi cans.

[$Lindz$]

Oooh! I've got an S4RS for sale! Guaranteed more than 67.2 rwhp!

Shameless plug: http://www.ducatimonsterforum.org/index.php?topic=65294.0

[Steve.In.Atlanta]

Shameless plug: http://www.ducatimonsterforum.org/index.php?topic=65294.0

[Buckethead]

I'm running 15/45 on the 800...

I've heard/read (on here and elsewhere) that having multiples for gearing can lead to abnormally fast chain and sprocket wear.

Any issues that you've noticed?

Also, out of curiosity, how many links in your chain?

[Dirty Duc]

I've heard/read (on here and elsewhere) that having multiples for gearing can lead to abnormally fast chain and sprocket wear.

Any issues that you've noticed?

Also, out of curiosity, how many links in your chain?

I went out to count links, and I lied.  15/44 with 104 links.  This set has been on for a year and a half or so, and only about 7k miles because of some other issues.

I appear to go through chains like nobody's business anyway.  The 15/44 set-up is also not ideal because of the chain length (I think).  I can tell because the clean part where the chain rubs looks non-random.

[dufukincati]

You may have the motor producing 80hp at the 'crank', however there are frictional losses along the way transmitting power from the drive shaft to the rear wheel. You typically lose 15-20% of power. 67 RWHP sounds about right.

[silas]

Buck-my '98 M900 is set up the same.  FCR 41's w/ ExactFit coils and K&N pods, 15/41 gearing. I've got Chris Kelley's stock jetting on the 41's. My bike pulls great in the low and mid range -light front wheel-but seems a bit flat at higher rpm's. Even flatter than stock carbs w the same 15/41 gearing. It also hates cruising at 30-40 mph, seeming to hunt and wanna accelerate, not cruise at those speeds. A small but noticable flat spot at hwy speeds of 55-65ish until higher rpms and speeds.  I'm thinking of trying larger main jets in lieu of a $300 dyno tune. Or a 42T rear sprocket.  Let me know what else you try.  Anyone have any more suggestions?

OTH, I did record 61mpg and 58 on the next tank while busting across TN at about 80mph consistently. I usually get 33-38 mpg's w/ in town use only.

[Rudemouthsky]

Buck-my '98 M900 is set up the same.  FCR 41's w/ ExactFit coils and K&N pods, 15/41 gearing. I've got Chris Kelley's stock jetting on the 41's. My bike pulls great in the low and mid range -light front wheel-but seems a bit flat at higher rpm's. Even flatter than stock carbs w the same 15/41 gearing. It also hates cruising at 30-40 mph, seeming to hunt and wanna accelerate, not cruise at those speeds. A small but noticable flat spot at hwy speeds of 55-65ish until higher rpms and speeds.  I'm thinking of trying larger main jets in lieu of a $300 dyno tune. Or a 42T rear sprocket.  Let me know what else you try.  Anyone have any more suggestions?

OTH, I did record 61mpg and 58 on the next tank while busting across TN at about 80mph consistently. I usually get 33-38 mpg's w/ in town use only.

That's funny, we have identical situations. In the 30-40 mph range, does it feel almost like a rapid series of tiny misfires? kind of like stumbly/hiccupy until you wack the throttle some more?

And that flat spot you're talking about at HWY is by far the most disappointing thing. My 750 motor with a jet kit and chopped airbox pulled better at those speeds. THAT is the real WTF for me.

I'm wondering if its our pods actually. The power curve on the dyno was beautiful, progressive and smooth is the good news and the techs couldn't see anything they would suggest changing. I would go back to an open airbox before I tried anything else.

[silas]

Yes and yes! Hates slow traffic -hunts unless accellerating-and poor accel @ hwy speeds. I need to find a solution as-is. I hacked my air box off, leaving the battery box & coils hanger intact. I love the intake sucking and honking too much with pods to go back to an airbox...plus the open frame look. I think you're right-the airbox works better than pods-possibly @ hwy speeds mostly-but I'd like to see if my setup can be improved. Not going back to an airbox.

[silas]

Yes, My old injected '99 750SS also pulled harder on the hwy than my current setup

[koko64]

Those carbs need to be tuned correctly to the intake and exhaust mods of your motors. What mods exactly and what jetting you guys running?

[silas]

98M900, ExactFit coils, Arrow slip ons, FCR41's w/ stock settings, pod air filters..
Engine totally stock. 30K miles. 5k miles on this setup w/carbs & coils.  I have not messed w the FCR's or checked the below listed stock settings internally. I Really want to keep the pods.

My carb settings(stock from Chris Kelley):
Fuel mix screw: 3/4 turn
Slo air  1 - 1 1/2 turns
Float ht 9 mm
Main jet 155
Main air jet 200
Slow jet 60
Needle EMT
Needle clip 3rd pos.

Thx ahead for any suggestions for us.