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post #1 of 11 (permalink) Old 11-25-2013, 08:44 PM Thread Starter
 
Join Date: Feb 2012
Posts: 42
flat spot in rpm

dear all,

its been a while since i have ridden my riot due to a bent rim, however I have taken it for a ride and noticed that there seems to be a flat spot, dip or bog from 6000 to 7000 rpm, does anyone know what this could be? since after that when i hit it wot it seems to be ok however it wasn't doing that before.
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post #2 of 11 (permalink) Old 12-16-2013, 11:09 AM Thread Starter
 
Join Date: Feb 2012
Posts: 42
Re: flat spot in rpm

Dear All,

Since i do not know much about snowmobile engines, I seem to have a flat spot in the power band at 3/4 throttle which I assume is about 5500-6500 rpm however picks up at 7000 and up, full throttle. Yesterday it was studdering at 3/4 throttle at coasting speed like if the belt wasn't engaging properly. however if I sink it full throttle right away it doesn't have this problem.

Can anyone make any suggestions please.

Best regards
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post #3 of 11 (permalink) Old 12-16-2013, 08:30 PM
 
Join Date: May 2013
Posts: 134
Re: flat spot in rpm

Maybe offer some more info..........any motor mods? Fuel programmer?
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post #4 of 11 (permalink) Old 12-17-2013, 10:14 PM
 
Join Date: Jul 2012
Location: Escondido Ca
Posts: 125
Re: flat spot in rpm

My Revolt is doing the same thing, I have the programmer but have not been able to dial it in yet. It feels amost like a bog then if you add a little more peddle it cleans up. I have a dirty map sensor that I pay no attention to but it did it before my light would flash.
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post #5 of 11 (permalink) Old 12-17-2013, 10:46 PM
 
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Re: flat spot in rpm

Quote:
Originally Posted by sdshawn View Post
My Revolt is doing the same thing, I have the programmer but have not been able to dial it in yet. It feels amost like a bog then if you add a little more peddle it cleans up. I have a dirty map sensor that I pay no attention to but it did it before my light would flash.
Try disconnecting the programmer if it is a Big Gun. In my opinion they are worthless.
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post #6 of 11 (permalink) Old 12-19-2013, 05:15 PM
 
Join Date: Jul 2012
Location: Escondido Ca
Posts: 125
Re: flat spot in rpm

Quote:
Originally Posted by Pilot View Post
Quote:
Originally Posted by sdshawn View Post
My Revolt is doing the same thing, I have the programmer but have not been able to dial it in yet. It feels amost like a bog then if you add a little more peddle it cleans up. I have a dirty map sensor that I pay no attention to but it did it before my light would flash.
Try disconnecting the programmer if it is a Big Gun. In my opinion they are worthless.
Ok I try see if it make a diffrence with it disconected, Also where can I get Aluminum belf guard and how much . Im going to weld some more steel on my stock one for now until I find a better option
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post #7 of 11 (permalink) Old 12-19-2013, 07:32 PM
 
Join Date: Jul 2009
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Re: flat spot in rpm

Quote:
Originally Posted by sdshawn View Post
Quote:
Originally Posted by Pilot View Post
Quote:
Originally Posted by sdshawn View Post
My Revolt is doing the same thing, I have the programmer but have not been able to dial it in yet. It feels amost like a bog then if you add a little more peddle it cleans up. I have a dirty map sensor that I pay no attention to but it did it before my light would flash.
Try disconnecting the programmer if it is a Big Gun. In my opinion they are worthless.
Ok I try see if it make a diffrence with it disconected, Also where can I get Aluminum belf guard and how much . Im going to weld some more steel on my stock one for now until I find a better option
Take that welder and put some brackets on the frame to bolt a flat piece of aluminum to. Make it about 5" wide and shape it to form around the primary clutch and extend back to the secondary. It only needs to cover the front and top of the primary clutch to be affective. If you start with a piece that is about 36" long that is plenty. Disconnect your ECU before welding on the frame.
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post #8 of 11 (permalink) Old 12-21-2013, 04:09 PM Thread Starter
 
Join Date: Feb 2012
Posts: 42
Re: flat spot in rpm

Hey Guys thank you very much for the feedback and yes I have a power commander how ever it was doing it before I put it. Tomorrow I will dedicate time on tuning and will put back the normal map sensor. Will keep you guys posted on the results. Shawn it is exactly how you are mentioning it.
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post #9 of 11 (permalink) Old 01-28-2014, 09:52 PM
 
Join Date: Jul 2012
Location: Escondido Ca
Posts: 125
Re: flat spot in rpm

My map sensor is dirty also, tried to clean but not clean enough light still comes on. I have my programmer mounted on the side of the car not thinking ahead that I would need to see where Jim going as I program. Does your car have a slight hesitation right off aide if you stab it, my buddy thinks it may be the throttle position sensor anyone have so ideas about that? Omar let me know if you figured out the problem.

And pilot I made a new belt guard like you said, it came out real good I think, hopefully no more rattles or noise from that.
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post #10 of 11 (permalink) Old 01-29-2014, 06:05 PM Thread Starter
 
Join Date: Feb 2012
Posts: 42
Re: flat spot in rpm

hey guys well i have actually started playing around with the bigun fuel programmer the last time and kinda of reduced the problem alot by leaning it out in one of the settings however still need to play around with it more.

"SDshawn" no mine does not do it when i stab it but rather when i have it at 3/4 throttle at 5500-6500 rpm.

I would try doing everything in steps.

clean throttle body sensor.
clean map sensor
make sure that everything is clean and serviced then try tuning with the big gun if you have never done it. its real easy but need to have the big gun in view when riding to see where it is acting up. this is just my 2 cents on the topic. let me know how it goes.

Last edited by omar; 01-29-2014 at 06:09 PM.
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