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MY21 650 SBA 146, ES, ICE Storm 1.5
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Has anyone had a problem with oil ,from engine blowby,
building up inthe airbox and dripping onto the drivebelt
causing slipage and/or blown belts?[/b]
Every 500 miles you should check your oil breather foam and the air filter.

If this has not been done, the problem can occur. It can also occur if the sled has been tipped on its left side. The fall of 06 updates may help this problem some, but it is important that you run the oil level on the low part of the engine oil dipstick, and check the oil level properly, to avoid overfilling.

Page 97 of your owner's manual explains what to do:

Foam Oil Breather Element

The foam oil breather element absorbs small amounts of liquid to
protect sensors within the intake system from damage due to oil
ingestion. Clean or replace the breather element at each engine oil
change. Clean the element if the snowmobile has been tipped on its left
side three times, either during service or while riding, as oil may leak
into the element.

CAUTION
Operating the snowmobile with a clogged foam oil breather
element can result in severe engine damage. Always clean or
replace the element as recommended.

The foam oil breather element is located inside the airbox.

1. Open the hood.
2. Release the airbox cover
retaining clips and remove the
cover.
3. Remove the foam breather
element.
4. Wash the foam element in soapy
water, then rinse thoroughly and
let dry.

NOTE: If soap and water are not
readily available, remove as
much liquid as possible by
pressing the foam element
in paper towels or a similar
absorbent material.

5. Reinstall the dry foam element, or install a new foam element.

NOTE: Always replace a foam element that is brittle, cracked,
crumbling or otherwise damaged. For best performance,
routinely replace the foam element with every other engine
oil change.

6. Reinstall the airbox cover. Secure all retaining clips.[/b]
 

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Discussion Starter · #3 ·
Sled was serviced at 400 miles, checked airbox at 850 miles
and it had lots of oily white sludge on the bottom that I cleaned
out. Sled had a hard time getting up to 80 mph before and after
I cleaned it. about 100 miles later the belt blew.
 

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Sled was serviced at 400 miles, checked airbox at 850 miles
and it had lots of oily white sludge on the bottom that I cleaned
out. Sled had a hard time getting up to 80 mph before and after
I cleaned it. about 100 miles later the belt blew.[/b]
Many of us have seen this problem. Its from the rising oil issue extensivly reported on this site. Polaris has put out a couple free updates to prevent the rising oil (due to fuel in oil). One is a leaner fuel map. The other is a restrictor in the oil cooler to raise the temp in the oil tank high enough to vaporize any fuel in the oil. This is what you need to do. Change your contaminated oil, Clean the clutch sheeves, clean bottom of the airbox. Get the updates done. Run your oil level at low mark as Excursion pointed out, and watch for any fuel/oil in your airbax and clean out imidiatly if any found. It can drip out the drain holes onto your belt. This may be all moot if the updates work.
 

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17 Posts
Discussion Starter · #5 ·
All updates done,sled is at dealer.tec. said cyclone may be the
problem, thing that goes in breather tube to separate vapors?
IT was plugged up with sludge ,possibly because it wasn't sitting
straight and not draining out or freezing up.
 
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