13 shaking really bad

fao1 · Dec 27, 2012

hi,
weeks ago i hit a rock at the tail of my rear suspension when i was wheeling( that sucker was out about 6 inch out lol never see it with my nose pointing the sky those things are awsome lol) and since it's shaking really bad from boards and steering. i checked everything on the rear suspension shaft,wheels, rail , everything.so i tought it was the driveshaft , i tried to checked it with a dial indicator but my result are inaccurate
here its an example of what i got but i have no clue if its right or not because my lowest result vs the higher ones are not at the opposite one another . if someone can give me an advice on how to mesure the runout of the shaft (if its possible) it will be nice or if anybody have idea on what else can be wrong for that shaking prob.

fao1 · Dec 27, 2012

this is not my shaft its a pic that i get on ebay mine is brand new so surface are smooth and not rusty for proper dial mesurement.

caper11 · Dec 27, 2012

I can't see how that type of impact would effect the driveshaft. Have you tried running the sled on a track stand? If your rear axle bent just a little bit it may be enough to make the wheels contact the drive lugs on the inside of track

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sledheadedd · Dec 27, 2012

might be a flat spot in the belt.

fao1 · Dec 27, 2012

caper11 said:
I can't see how that type of impact would effect the driveshaft. Have you tried running the sled on a track stand? If your rear axle bent just a little bit it may be enough to make the wheels contact the drive lugs on the inside of track

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me too but i began to be a little desperate and it was shaking alot in steering so i tought it would be this.

i checked it with a straigth edge and my axel wasn't bent but i will check that on a stand soon. if i find nothing else iM going to put it back together and ride like this until something break. its possible that i got wheel rubing issue

sledheadedd said:
might be a flat spot in the belt.

if its that i will be pissed off hahaah i was so focus on rear suspension where impact happen that i forgot to check this :face-icon-small-blu

thanks i will check my strap

i also check my track and its ok

Red-eye · Dec 27, 2012

Did you twist the spline on axle or jack shaft? Damage the chain?
Try to match the frequency of the vibration to the primary, secondary or track speeds.

fao1 · Dec 27, 2012

Red-eye said:
Did you twist the spline on axle or jack shaft? Damage the chain?
Try to match the frequency of the vibration to the primary, secondary or track speeds.

i checked my sprocket and chain and they were ok but i didn't stop on spline when i was there so i will check this tomorrow thanks alot.

in my hand my strap seem not to have a flat spot but im gonna try tomorow with the brand new spare one!

06redrevx · Dec 28, 2012

Check all your bogey wheels as well.
Have seen some terrible vibrations come from broken or chipped wheels

fao1 · Dec 29, 2012

look what i found , i don't think this is normal maybe secondary bolts.

http://www.youtube.com/watch?v=5K7mpXHffJ0

caper11 · Dec 29, 2012

I dont think you have a problem there, You,re measuring axial runout. measure radial runout.

winter brew · Dec 29, 2012

Outer (stationary) sheave is all that matters....inner will move quite a bit and will go where the belt puts it....quite a bit of play in the inner sheave. I would try a different belt and see if that changes anything.

fao1 · Dec 29, 2012

vibration are the same with the two straps my 150mile one and the brand new one

SnoConeKing · Jan 6, 2013

yeah, you can get the jerky feeling from a belt. I have thought i have much bigger problems when it was just the belt.

PJ-Hunter · Jan 6, 2013

Did you check your idler wheel bearings? I had a bad one on my sled last season and it shook pretty bad.

Also do you have a loose motor mount? Is your primary on tight and properly torqued? Is your brake rotor loose?

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13 shaking really bad

fao1

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