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Discussion Starter · #1 · (Edited)
Hey guys!

I just started riding and bought a 2003 SV650N in silver as my first. It has about 35k miles on it but still runs strong.

I recently took it to a local shop for an oil change, chain maintenance and to bleed and check the brakes. I would like to do these things myself once I get the space and the tools but I decided to let the pros handle it this time.

I got the bike back and I instantly noticed it was really smooth all the way through the rev range compared to how it was before, so I was happy. But, as I was riding it through the week I noticed I had lost quite a bit of top end power. I could notice it especially when merging onto highways. I had checked the oil level when I picked up the bike. It looked really clean but it was quite a bit past the Full line, but I figured they knew what they were doing (synthetic 10-40, I believe).

I took it back to them today and got them to suck some of the oil out and now it is right about midway between the two lines. I rode it around for a bit and I think it is back to normal. It sounds aggressive again like it used to.

So, am I imagining things? Is it possible for a bike to lose power from too much oil?

Thanks!

Edit: The oil sucked out was pretty dirty for only being a week old...
 

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Oil turns dark rather quickly in aluminum engines. One problem that can occur from overfilling the crankcase is if the level reaches the crankshaft and causes the oil to aerate and foam and cause a loss in pumping and oil starvation of the crank bearings. That's a worse case scenario with excessive oil levels. You would also get increase oil vapor entering the breather hoses into the airbox and possibly smoking out the exhaust. Doesn't seem like the oil level was that high in your case. Perhaps the perceived loss in power was due to an increase in crankcase pressure, but I'm really guessing on that.
 

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Only thing I can think of is oil thru the breathers into your airbox causing a rich condition making it a bit sluggish and probably soaking your airfilter in oil. I would check and possibly replace your aircleaner.
 

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Hey guys!

Is it possible for a bike to lose power from too much oil?

Thanks!

Edit: The oil sucked out was pretty dirty for only being a week old...
Unless it's so full it's pumping into the air box.........NO
 
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