growling viper?

super1c

super1c

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Sep 15, 2003
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54
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Freeland & Otsego lake, MI
No other way to describe sound but is sounds as if my viper has developed a growel.. Not sure if its a low end burbble or what. This sound has no effect on performance, its not à bog. Usually happens after a longer run or longer corner to corner. I let off the throttle and if I start to ease back on the throttle I get a growling sound from exhaust. If I blip throttle and accelerate it clears right up? Almost seems worse when I have a idle hang. Recap, happens Mostly with small amount of throttle around 4-5 thousand rpm and worse with idle hang. All stock jets, fuel acres 2 turns out needles 4 groove both washers top. Plugs look good, pistons look book. Any ideas?
 
Could it be your exhaust manifold springs? I had to chance mine recently, I could actually see the pipes separating when I cracked the throttle. Mechanic even suggested putting 2 springs per side.
 
Yes almost like its loading up. Plugs new this year and look good, 800 or so miles. And what's funny when I brought it up to the wife she said the same is happening to hers. So I'm now even more perplexed.
 
No I'm sure exhaust seals are good. Good springs and joints copper sealed. Maybe it is a bog and I'm not picking up on it cause sled is moving? Hmmm I don't know but its driving me crazy
 
I am having the same issue with my 03 Viper. Same set up and I have the opticool gasket. I also have a idle hang with this growl that is driving me nuts. Doesn't sound like a well running Yamaha. I cleaned the carbs and that didn't help. Checked exhaust gaskets and all look good. I also get a bog if I hammer the throttle from a stand still.
 
super1c said:
What about powervalves? Could sticking or stuck PV cause this?
Click to expand...

Might very well be the power valves, 5000 to 6000 rpm is when the sound of the motor changes ( I think its a change in the position of the power valves). Are they clean? Have you adjusted the cables, or checked the operation with the servo cover removed?
 
brethren said:
Might very well be the power valves, 5000 to 6000 rpm is when the sound of the motor changes ( I think its a change in the position of the power valves). Are they clean? Have you adjusted the cables, or checked the operation with the servo cover removed?
Click to expand...

They were at the beginning of the season. But 8-900 mile later I'm sure not. Never happened before but always a first for dirty stuck or broken PV. Reason I'm looking for ideas is because sled is 2 hours away and I'm brainstorming for ideas for when I go back up.
 
I know this is way off but a possibility. If its just a sound and no other issues. Did you and your wife just get new helmets or hats or whatever you where under the helmet? I know this sounds weird but when I got a new helmet, all my sleds suddenly had "running issues". Like the helmet is filtering out a certain sound frequency.
I've had this with just a new balaclava.
Just a thought.
 
I did take the new helmet thing into consideration as we changed to 509 gear from modulars this year. Makes everything sound different when riding. But the sound has just developed. My moneys on PV's. New info from wife was top speed across lake was way down for her. So I'm guessing some dirty stuck valves if not pull throughs. Our riding has been a lot of slow trails this year as we have been a small group by ourselves or with big group. So maybe the gummed up faster this year. We will see.
 
I will clean my PV tonight after work and will post results. It is annoying when riding. I have not changed helmets and I started hearing the sound.
 
power valves. mine used to do the same thing, was really noticeable with a bender can on it. could hear it a lot more. sounds like it is having at least one stuck open. loses low end and will bog for sure
 
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