Jump to content
Sign in to follow this  

Here is the story...

Recommended Posts

I'm not sure what is going on, so I need some help.

I've recently changed my oil and filter (yes, I placed the correct amount of oil in the crank) and when I start it up then, let it sit for 10 min. the sight glass appears almost empty. So, I added just a touch more - looks good, and start it up and same thing?!!! Long story short, I replaced the new filter with other new filter thinking it was bad, but still the same story.

What would cause this? Is the sight glass accurate? I had no problems before with this? Please tell me its nothing major...

Thanks for you help!

Share this post


Link to post
Share on other sites

I agree!!! I mean I tip the bike on its side etc... and it still seems low. I don't get it because just a few weeks ago, this was never a problem:banghead:

Share this post


Link to post
Share on other sites

The ONLY time the oil window is accurate is about 10 minutes after the engine has been run.

36 ounces with oil filter change and ride

Share this post


Link to post
Share on other sites

I had the same problem on my first oil change. I put in 20-50w syn. put the recommended 1.04cc and warmed up the bike for 3 minutes nothing showed up on the glass. Then I rode it down the alley still nothing. So I added like 200cc more oil to were it was on the bottom of the glass on the stand. Then I road the bike out in the desert and its a litttle above the top of the sight glass. Should I be worried about to much oil?

Share this post


Link to post
Share on other sites
I had the same problem on my first oil change. I put in 20-50w syn. put the recommended 1.04cc and warmed up the bike for 3 minutes nothing showed up on the glass. Then I rode it down the alley still nothing. So I added like 200cc more oil to were it was on the bottom of the glass on the stand. Then I road the bike out in the desert and its a litttle above the top of the sight glass. Should I be worried about to much oil?

Na, that is what the crankcase vents are for. I never trust those sight glasses, just make sure the recommended amount is put in and call it goo. After a long hard ride, it will be right where it needs to be.

Share this post


Link to post
Share on other sites

Add the recommend amount in and do what the manual says. When warm, wait for 2 minutes beofre looking in the sight glass.

If you do, you will see teh oil where it needs to be.

When running the oil pump is pushing oil to the valves and piston (via pump) so you will not have oil sitting in the crank case to make a measurement.

If you think about it, it would be very hard for the manufacturer to make a sight glass effective while the bike is running. That is also why you check oil on a car with it off. You would have to account for how much oil could be in motion at any given point, volume of the oil pump/filter, etc.

So waiting 2 minutes is actually a good compromise to checking when completely cold, so you can check during riding session and not have to wait an hour.

Share this post


Link to post
Share on other sites

Thanks for the replies.

After some research (Owners Manual) it appears that becuase it's semi-dry pump, oil my not always appear in the sight glass. It varies upon engine RPM when shut off, etc... so all is good.

I'm just going to put in the required amount of oil and forget about it. I mean really, I have had many bikes that didn't have a sight glass and all was good!:thumbsup:

Ride On!

Share this post


Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Reply with:

Sign in to follow this  

  • Similar Content

    • By tanner_shany24
      Hey guys, I have a 2012 KX450f and it is giving me major issues. I will give you a run down of the history of it. I bought this bike a few months ago and have only ridden it really once, yes once! When I bought it everything seemed to check out, it ran fine, started fine, sounded fine, so I bought it. Took it out to ride and the first hill I hit it got really hot and overheated like a SOB and spewed coolant everywhere. I thought to my self maybe it was because we were riding trails slow before so maybe when I actually got on it it got too hot. After that though, it began to overheat every 3 minutes no  matter what, I would ride it for 3 minutes, and have to stop to let it cool down because I was scared I was going to melt the top end. Got home and started inspecting, found out that oil and coolant was mixing both where the oil is supposed to be and where the coolant is supposed to be. After some research I found that the 2012 450 had head gasket issues. Assuming that was the issue, I took the head off and got it resurfaced (it was actually decently warped) and put new gaskets in everything top end related. Piston and cylinder looked brand new by the way. So I put it back together, started it up, and it instantly started spewing coolant and oil mixed out of the crank case breather hose. Like literally as soon as i started it and it would make a puddle on the ground in 10-15 seconds. I'm at a loss here, brand new coolant and brand new oil, brand new head gasket and resurfaced head, and it instantly started doing the same thing again? What could it be? Is it worth my time or do I part the bike out? I have put way too much time into this bike to want to tear back into it again unless it is something cheap to fix, if not I am going to post it on craigslist and let someone else deal with it. Overall this whole experience makes me want to go back to a 250T! XD
    • By Sam Mclean
      Hi new to this site.
      Ive just bought a cheap kx450f with what i thought would be a minor issue.
      I was told it was only running with the choke on and i thought easy fix, just a blocked jet. So i pulled it apart as must of the person before me and i find a broken soround thing that the plastic case sits on around the pilot jet. So i appoxy that back on unblock the jets and clean it all out, put it back together and now i try starting it for the first time and see the fuel dripping as it was when i bought it. When i look closer i see it is seeping from what looks like a crack in the float bowl. Ahhh
      So my problem is. Looking for a cheap carby might solve all my problems or just a float bowl at worse case. Now i can find many kx450f being wrecked nearby so im wondering are most 450 carbys the same? Will one of a yz450f work? 
      Can someone please help
    • By Sam Mclean
      Hi new to this site.
      Ive just bought a cheap kx450f with what i thought would be a minor issue.
      I was told it was only running with the choke on and i thought easy fix, just a blocked jet. So i pulled it apart as must of the person before me and i find a broken soround thing that the plastic case sits on around the pilot jet. So i appoxy that back on unblock the jets and clean it all out, put it back together and now i try starting it for the first time and see the fuel dripping as it was when i bought it. When i look closer i see it is seeping from what looks like a crack in the float bowl. Ahhh
      So my problem is. Looking for a cheap carby might solve all my problems or just a float bowl at worse case. Now i can find many kx450f being wrecked nearby so im wondering are most 450 carbys the same? Will one of a yz450f work? 
      Can someone please help
    • By BadcaseofTB
      I missed tracking where this little top hat came out of in my 2011 kx450f. Was thinking clutch or right side engine cover. Any help would be appreciated I can’t seem to find it in the manual.

×