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My oil problem

3366 Views 16 Replies 12 Participants Last post by  MNStryker26
So I had around 2000 miles on the bike and decided to swich to full synthetic. The only motorcycle oil (4t) I saw at the time was
20w-50. So I bought that at 10.50 per quart. changed the oil and filter, started up the bike and it ran like crap. Its was knocking and pinging like crazy. I let it idle for a few minutes and it got a little better so I took it out for a few miles. It knocked the whole time. It did settle down after 30 or so miles but every time I let it cool it knocked again every time I started it back up. Long story short I went back and got some regular 10w-40 4t oil, changed it again and it ran like a dream. I think maybe the engine wasnt broke in enough for the full synthetic oil. or maybe 20w-50 was just to heavy of an oil. Either way I'm gonna stick with regular stuff for now.
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Thanks for the thread, my yamaha dealer only recommends 10w40, it may be the weight of the oil just does not get into the tight clearances of the new motor. Unless you are running in extreme heat I would stick to the 10w40. Can not imagine it being the oil filter, I am a mechanic and have never seen a clogged/defective oil filter.
No, oil could cause a lot of noise, fuel problem, not likely unless you are having some serious running problems!
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