Bad Vibration at 60-85+ MPH..

[Blue Dave]

False alarm guys. I just did a test with the stock inner idler wheel and the spoked accessory wheel SMA-8FP38-01-xx.

I took off an inner mounting block and set it flat on my workbench with both wheels installed. Both wheels measured exactly the same distance from my workbench to either side of the rubber no matter which way either one was oriented on the mounting block.

The spoked accessory wheel does extend about 4mm further out on the "finished" side but not in the area which could possibly contact a track lug.

The "dished out" area on the "finished" side is closer in to the hub where it could not contact a track lug.

 

[**sj**]

I have yet to run mine...just installed them on the pioneer hyfax exrtender brackets which drop the wheel down 2.5mm

now Im concerned...just quick visual seems like the finished side dished out area would contact the top of the cogs if finished side out...but you say no eh dave?

4mm wider on the finished side is a lot ...
dont forget there is side to side movement of the track??

 

[welterracer]

if you have the wheel mounted on the inside you are saying it is inset (closer to the center of the track) by 4MM????????

Just trying to get a grasp on what your saying..

WHat if you flip the wheel..

Mine are definitly rubbing the lugs just sitting there and the track is at dead center

 

[Blue Dave]

I took one of the spoked wheel in my hand and rolled it between the inner lugs on my track (my skid is out right now) and I could not get the "dished out" area on the finished side to contact the lugs.

The lugs are not tall enough to contact the "dished out" area of the wheel which is further in to the hub area of the wheel.

 

[welterracer]

Blue dave..

Something cant be right.. its not the finished side thats contacting my lugs..

Its the back of the wheel (the unfinished side) that is making contact with the rubber lugs (you can see how the rubber part of the wheels is starting to get chewed up..

 

[Iceman57]

Brian, if your new wheels use the 6205 bearings which are wider then the bearings in the stock wheels, this will move the wheels closer to the inside of the track due to the thicker bearing width. Weather or not this is causing your vibration (which I bet money it is) you don't want to leave your wheels contacting the lugs because when the track moves from side to side it will be putting way to much side pressure on the wheels. You will have to get the mounting blocks machined to bring the wheels closer to the rails.

 

[Blue Dave]

I am saying that the outer circumference of the wheel (the rubber area) is in exactly the same location relative to the mount on the stock wheel and the SMA-8FP38-01-xx spoked wheel regardless of which side is facing in or out.

The spoked wheel is "dished out" on the finished side but this area is further in towards the hub and therefore this area can not contact the track lugs.

The track lugs are about 15mm high and the "dished out" area of the spoked wheel just begins sloping outward at about 15mm inwards from the outside circumference of the rubber.

Because the rubber area is centered on the bearing it would not matter anyway which side faced which way on the inside mounts since the wheel must be centered between two sets of track lugs. These wheels use a 6005 bearing which is the same as stock.

 

[**sj**]

spoked wheel....
130mm. 6005 bearing

now on my setup...I have those pioneer bracket which drop the wheel 2.5mm....it sure seems like the cog could hit with track side to side movement

 

[Blue Dave]

Brian,

Are you using the SMA-8FP38-01-xx spoked wheels? If so, these have a 6005 bearing just like the stock ones.

However if you are using the SMA-8EK38-01-xx accessory wheels then you have 6205 bearings which will require that 1.5 mm be removed from the inner mounts to re-center the wheel.

 

[pat the rat]

you drive shaft might be cracked,last year i broke my driveshaft on my warrior,maybe 30 miles before it actually snapped i noticed a vibration in the footwells and thru the bars,the faster i went,the worst it got,i knew something wasnt normal,so i tried to get to the next town but i didnt make it,it snapped close to the tunnel inside the outer sprocket,might be something you could inspect

 

[**sj**]

I believe welt is and I am using the SMA-8FP38-01-BK

 

[Iceman57]

Brian, if your bearings and mounting block meet up like the one on the left you have the 6005 bearing and I can't imagine what could have moved your wheels to the center of the track to contact the lugs. If your block is recessed like the one on the right you have the 6205 bearing and that is causing your problem.

 

[**sj**]

mark....the catalog says 6005 bearing..mine are already installed...mine have the red seal? wonder if they changed to a 6205 and never update the accessory catalog?
and I had a slight gap like that on the right on the rear axle ?
anyone have these out to see?

 

[welterracer]

i am using the SMA-8FP38-01-BK wheels..

 

[Blue Dave]

Like I said earlier, I just bought 8 of the SMA-8FP38-01-BK from Port and I have one in my hand. They definately have the 6005 bearing.