Author Topic: "Hoppy" at low RPMs  (Read 976 times)

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Offline Mcfly

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"Hoppy" at low RPMs
« on: March 10, 2012, 10:27:20 pm »
So, the bike has been running great... I really can't complain... BUT
From a stop, and on a slow roll, Connie does not like a slow throttle roll
to ~3k RPM.  As I live in the speed bump capital of the world, being able to
keep the throttle 'in check' would make life easier on a slow roll.

Best way to explain the symptom, is the bike does not accelerate smoothly
when I roll the throttle back slowly, until about 2700 rpms, then it runs fine.

The carbs were cleaned by the stealership in December, and this issue has
surfaced shortly afterwards.  I'm done with the stealers...  I've been running
Sunoco 89 octane regularly.  I plan to get SISF to do the carbs...
Just wondered if something I can do till then to make the bike more agreeable
at low RPMs. 
Performance -- Rear: C14 Shock - Front: Sonic 1.1 w/emulators, Fork Brace - SISF Jet Mod & Ex Cam Sprocket - Tokico front brakes
Comfort -- Russell Day Long - Madstad - Cruise Control

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Offline Steve in Sunny Fla

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Re: "Hoppy" at low RPMs
« Reply #1 on: March 11, 2012, 01:20:17 am »
That's common to stock jetting. I'd elaborate, but I'm just coming in from our wrench session and I'm connie'd out right now. steve
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Offline SteveJ.

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Re: "Hoppy" at low RPMs
« Reply #2 on: March 11, 2012, 02:20:57 am »
So, the bike has been running great... I really can't complain... BUT
From a stop, and on a slow roll, Connie does not like a slow throttle roll
to ~3k RPM.  As I live in the speed bump capital of the world, being able to
keep the throttle 'in check' would make life easier on a slow roll.

Best way to explain the symptom, is the bike does not accelerate smoothly
when I roll the throttle back slowly, until about 2700 rpms, then it runs fine.

The carbs were cleaned by the stealership in December, and this issue has
surfaced shortly afterwards.  I'm done with the stealers...  I've been running
Sunoco 89 octane regularly.
I plan to get SISF to do the carbs...
Just wondered if something I can do till then to make the bike more agreeable
at low RPMs.
Usually on a stock, standard engine, 87 octane is fine. Also, Sunoco is not a Top Tier gasoline. You may wanna start using Shell, Chevron, Mobil, Texaco, or Exxon.

Linky:

http://www.toptiergas.com/retailers.html
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Offline 2linby

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Re: "Hoppy" at low RPMs
« Reply #3 on: March 11, 2012, 02:42:59 am »

Just wondered if something I can do till then to make the bike more agreeable
at low RPMs.

Wear a neck brace!  ;) Honestly no. Get a two minute mod from SISF smooth sailing from then on............. :)
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Offline Mettler1

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Re: "Hoppy" at low RPMs
« Reply #4 on: March 11, 2012, 03:34:04 am »
  Clean carbs and Steve's 2 minute mod will probably cure that. I know my bike runs a LOT better at low rpm after the 2MM.
'94 Concours 115,000 miles-- 7th gear,2MM,KB fork brace,Over flowtubes,Stick coils,Tcro shifter,GPS,SiSF'sTorque cams,SPOOKFAK,block off plates, SS brake & clutch lines,KB risers, FENDA EXTENDA, emulators, SiSF carb Spa, Delkevic exhaust, Murphs' knee savers +grips, etc

Offline Jorge

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Re: "Hoppy" at low RPMs
« Reply #5 on: March 11, 2012, 03:44:53 am »
Mine does exactly the same (it's 100% stock in engine).
It seems to HATE running at part throttle around 2000 RM, but below 1500 it seems to not buck as much. We live in a quiet neighborhood and my wife reminds me of that sometimes (not so much any more). I usually get it up to 30 MPH or so, then shift up to get the RPM's around 1500, and it does not buck then.
Since it's a light load on the engine (level street) I can't imagine it will do any harm to it, and it is very quiet under those conditions.
Jorge

Offline Mcfly

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Re: "Hoppy" at low RPMs
« Reply #6 on: March 11, 2012, 12:00:33 pm »
Ok.  If it's nothing out of the norm for a 100% stock bike, I'm less
worried about it.  In a few weeks I'll be tearing out the carbs and
sending them off...  Been wanting to do it for a while now, but it
seems every time I have the $$$, other crap comes up. 

I'll also take the longer ride to the Mobil station  :)

Nothing like a good reason to take a longer ride.   :motonoises:

Thanks for the input guys.
Performance -- Rear: C14 Shock - Front: Sonic 1.1 w/emulators, Fork Brace - SISF Jet Mod & Ex Cam Sprocket - Tokico front brakes
Comfort -- Russell Day Long - Madstad - Cruise Control

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Offline WillyP

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Re: "Hoppy" at low RPMs
« Reply #7 on: March 11, 2012, 01:16:35 pm »
The carbs were cleaned by the stealership in December, and this issue has
surfaced shortly afterwards.  I'm done with the stealers...  I've been running
Sunoco 89 octane regularly.  I plan to get SISF to do the carbs...
Just wondered if something I can do till then to make the bike more agreeable
at low RPMs.

Short of doing it yourself, there is not anything else that needs to be done. You can try running some Techron or Seafoam through them but that may not help at all.

Ok.  If it's nothing out of the norm for a 100% stock bike, I'm less
worried about it.  In a few weeks I'll be tearing out the carbs and
sending them off...  Been wanting to do it for a while now, but it
seems every time I have the $$$, other crap comes up. 

I'll also take the longer ride to the Mobil station  :)

Nothing like a good reason to take a longer ride.   :motonoises:

Thanks for the input guys.

Sounds like plan!
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