98 SX 700 low speed noise/grinding sound

L

lil3incher

Member
Joined
Feb 2, 2014
Messages
97
Location
Rushoon, Newfoundland and Labrador, Canada
Im not sure if this was there all the time but I noticed a few days ago that there is a noise in the center of the sled, feels it in the seat by the gas tank but only when going slow, when you open her up it goes away, I checked most of what I can think of, chain tension, drive bearings both drive cog and secondary shaft bearings, new belt installed, there is a 1 1/4 track on it and it almost feels like the track might be rubbing also, but the noise im concerned about is the grinding /rattle noise in the center, Just wondering if this is considered normal? also noticed engine takes longer to rev down
 

Maybe one of the tunnel protectors came loose on the front. When I changed my suspension I noticed the front of the protectors was missing a rivet in the front and I could see the track was rubbing on it. I also had a 1 1/4" track. How is the track tension?
 
Checked the tension and tight it up s bit more, never made any difference, I dont know if its one of the shafts sliding back and forth a little because its an old sled ?? And like I said its only while driving slow, But I will check the tunnel protectors, that sounds very possible, dont know what else to check
 
I wish it were that easy my friend but its a new belt installed, unless its a faulty one and maybe slipping, im not sure what it could be, can't be anything serious though because I still give her s&%t and no problems lol, I even tried changing my secondary clutch setting from 3-3 to 6-1, never made any difference, It has me confused for sure
 
How is the tip of the rails lining up with the track? Tip of a rail bent in or out ever so slightly would make a weird noise/vibration. At a higher speed track may contact rail just a little further down making the noise/vibration less noticeable.
 
I see you checked the drive shaft bearings. Look at the motor mounts, see if no-action w arm welds are cracked, track alignment? Does your speedo still work?
 
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check your upper idlers on rear susp. either they have worn out bearings,a chunk out of them or are too wore out to hold the track off of the rear top shock mount, also, maybe one of the inside drive lugs are tore, hitting part of the rear susp.
 
Devilin AblueDress! said:
How is the tip of the rails lining up with the track? Tip of a rail bent in or out ever so slightly would make a weird noise/vibration. At a higher speed track may contact rail just a little further down making the noise/vibration less noticeable.
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To a T, this happened to me last year. I musta bumped over a rock or stump just right to cause the right side rail to tweak inward just enough to where the track cogs were hitting the rail tip. Acceleration created a bit of slack in track just after drivers, which alleviated a lot of the contact that was occurring. During slow speeds or decel it was very noticeable. Still weird though because you mentioned longer rev down time, so an issue like this doesn't make sense to me..
 
Batwolf said:
To a T, this happened to me last year. I musta bumped over a rock or stump just right to cause the right side rail to tweak inward just enough to where the track cogs were hitting the rail tip. Acceleration created a bit of slack in track just after drivers, which alleviated a lot of the contact that was occurring. During slow speeds or decel it was very noticeable. Still weird though because you mentioned longer rev down time, so an issue like this doesn't make sense to me..
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Could be 2 separate issues. Longer rev down time I would suspect a back shifting issue.
 
The back shifting makes sense because I just set my secondary spring from 3-3 to 6-1, I didn't think it would make a difference but I guess it did, and about the noise im going to wait till the season is over and pull everything out of the sled and examine everything
 
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