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Old 02-21-2009, 08:40 AM
Weekend Warrior
Join Date: Aug 2007
Posts: 23
Default Rancher 350 Oil In Breather Box

I bought a 2001 Rancher 350 recently. There was quite a bit of oil in the bottom of the breather box when I took it off to fix the starter. I am wondering how that could be there. I know they could have put oil on the air filter. Is there any way for it to get there otherwise? Please help. Thanks
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Old 02-21-2009, 01:32 PM
Red Rider
Honda, accept nothing less!
Join Date: Dec 2002
Posts: 12,734
Default Rancher 350 Oil In Breather Box

Usually, this is just drain down off the air filter, but....

....if it was burped up from the breather, it could be several things. Later models got a baffle in the crankcase in front of the breather, that helps prevent oil splashing up into the breather tube. You may have an early model without this? (Mine is an 00, and the very first one my dealer sold, so it has no baffle, and I have never had a problem with this! I did however have a 2wd 01, that did puke a lot of oil out the breather.)

Or, you could have worn rings (very possible given its age) and are passing compression into the combustion chamber, that then gets vented out the breather...and carries oil with it. A compression and leak down test can diagnose that.
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Old 02-21-2009, 01:46 PM
Weekend Warrior
Join Date: Aug 2007
Posts: 23
Default Rancher 350 Oil In Breather Box

Thanks, It has 3000 miles on it, runs good and doesn't smoke.
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2001, 350, air, atv, box, breather, compression, crankcase, filter, honda, oil, rancher, reading, smoking, test, vent

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