07 Dragon, crank bearings out at 2000mi.!

[800xr]

So I figured it out today. The pto side rod bearing went out yesterday at 2000 miles.

This happened on my 02 800 a few years ago but had hoped polaris had figured it out. guess not!

Bought the sled w/ 1700 miles, recently put an SLP single pipe on and found that the primary spring was broke so installed a new one w/ 66 gram weights and the sled finally ran like I thought it should before it laid down.

Is it true that using an impact to get the primary clutch off ruins the bearings cause I don't belive it but I did use an impact to try to remove the primary, that would not come off only 30 miles before it laid down.

Where's the best place to have my bottom end gone through. besides SLP.

Thanks

 

[sled_guy]

Ok, sorry that you had problems.

First off, the '07 is a completely different deal than the older 800s. The new 700s have been dang bullet proof... makes me wonder what the first 1700 miles of it's life were like before you got it.

I have used Northern Crankshaft in Theif River Falls or Indy Specialty to do my cranks.

sled_guy

 

[escape6875]

Completely beside the point but is this sled an rmk and what spring are you using?

 

[markoo]

That's why you shouldn't use an impact gun to take the primary off.

 

[Rick!]

I tend to believe that an impact is less harmful than beating on the bar inserted through the end of the clutch tool with a BFH. The rod bearings on small blocks go out due to having not quite enough diameter to be bullet proof.

 

[simmjosh]

Just spoke to SLP

Byron in the shop at SLP just told me sometimes you have to give it a good pop with a hammer to get the clutch off. He said it will NOT hurt the crank or bearings.

 

[800xr]

IT was the black/white polaris spring. not an RMK either. 121 Dragon.

Most people say the impact and tapping it w/ hammer doesn't hurt the crank.

I'll be taking it to Dan here in MN and he'll tell us what caused it.

Thanks

 

[Daggerboat]

Not being properly stored through the summer is harder on the bearings then impacts....I like to pour some oil into the cylinders after fogging and then store it where temperature doesn't fluctuate too much

 

[IQRIDR]

Always use fogging oil in 2-strokes during the summer months, and have the Primary clutch balanced at the start of each season. Prevents a lot of these type of problems. Crank bearing failure on small block 700's is not a common problem, these motors are fairly bulletproof.

Also, when you go to remove the clutch, tip the sled on its side, remove the clutch bolt, fill the crank end half way with grease or water, then wrap your clutch puller threads with teflon tape, and use the hydraulic pressure to pop the clutch off. You'll never have to hit it with a hammer again.

 

[800xr]

pulled the motor last night and found that the intake/ airbox was either installed incorrect or something because it was letting belt dust and all kinds of debris by into the motor.

I bought a sled that was not maintained at all. oops. live and learn i guess.

Anyone have a problem with the airbox not fitting tight to the throttle body?