KPX oil leak.

letsride · 05-20-2023, 12:42 PM

I'm in process of checking / adjusting the valves on the KPX today. I removed the stator cover inspection plugs to rotate the motor and there is alot of oil in there. I plan to remove the cover and see where it is coming from. I sure hope it isn't the crank shaft seal. I also think the bike is a little on the lean side.

letsride · 05-20-2023, 01:16 PM

Now I'm questioning whether I'm going crazy. I think the stator is supposed to run dry. I started to remove the cover then I realized the starter drive is in there too. So Me thinks this thing is supposed to be wet in there. Or hell maybe I'm thinking of the old magneto ignitions. Someone come straighten out my crazy today. LOL

J4Fun · 05-20-2023, 02:27 PM

Just a thought here, everything looks normal to me! The spark plug shows lean and on your bike I would think that’s normal too…for fun check your chain tension

letsride · 05-20-2023, 03:15 PM

Quote:

Originally Posted by J4Fun

Just a thought here, everything looks normal to me! The spark plug shows lean and on your bike I would think that’s normal too…for fun check your chain tension

I would like it to be a little more brown in color. But fuel injection bikes may run a tad on the leaner side of things. Not sure, this is the first F.I. bike I've owned. Oh and trust me on a stock Chinesium chain one must check chain tension frequently LOL. Thanks for the reply.

Megadan · 05-20-2023, 06:00 PM

There is no crank seal under that cover. Just like the CG engines the stator cover is intended to have a small volume of oil get splashed around inside of it for the one way bearing on the flywheel and for the ears an bearings of the starter system. The flywheel shields the stator from a majority of the oil, and the wires are enameled and epoxied on the windings to protect them from the little bits that do get past.

Quote:

Originally Posted by letsride

I would like it to be a little more brown in color. But fuel injection bikes may run a tad on the leaner side of things. Not sure, this is the first F.I. bike I've owned.

Most fuel injected engines run that lean. Maybe a touch of tan in a spot or two. The reason they usually do end up that clean is due to EFI being so much more finely tuneable that they can be run very lean during idle and part throttle with no risk to the motor. Once the plug is subjected to that leaner low load enironment all of the soot or other buildup on the plug gets burned away.

You don't risk melting a hole in a piston at 15.5-16:1 AFR when the throttle isn't open at all, or only about 10-20%. And yes, many fuel injection systems are prorammed this way. The biggest challenge manufacturers have with fuel tuning is getting the fuel enrichment tables right when the throttle is opened more and the AFR needs to increase.

letsride · 05-20-2023, 06:04 PM

Thanks alot Dan, that explains it nicely. I don't remember seeing any oil in the inspection plugs on the Brozz. But that may be due to the attitude of the bike when I was working on it. And the Kpx was leaned more to the stator side today.

XLsior · 05-20-2023, 07:55 PM

If it isn't marking its territory I wouldn't worry to much about an oil leak...

letsride · 05-20-2023, 08:11 PM

Quote:

Originally Posted by XLsior

If it isn't marking its territory I wouldn't worry to much about an oil leak...

I had a Harley Davidson that used to do that. But it was par for the course with that bike. LOL

05-20-2023, 12:42 PM	#1
letsride Join Date: Oct 2013 Location: Leesville SC Posts: 832	KPX oil leak. I'm in process of checking / adjusting the valves on the KPX today. I removed the stator cover inspection plugs to rotate the motor and there is alot of oil in there. I plan to remove the cover and see where it is coming from. I sure hope it isn't the crank shaft seal. I also think the bike is a little on the lean side. __________________ My Stable- 2022 Lifan KPX250 , 2023 Royal Enfield Himalayan, 1992 Honda GL1500 Goldwing, SSR 70 Auto, Kymco Mongoose 90, Honda Four Trax 300
	0

05-20-2023, 01:16 PM	#2
letsride Join Date: Oct 2013 Location: Leesville SC Posts: 832	Now I'm questioning whether I'm going crazy. I think the stator is supposed to run dry. I started to remove the cover then I realized the starter drive is in there too. So Me thinks this thing is supposed to be wet in there. Or hell maybe I'm thinking of the old magneto ignitions. Someone come straighten out my crazy today. LOL __________________ My Stable- 2022 Lifan KPX250 , 2023 Royal Enfield Himalayan, 1992 Honda GL1500 Goldwing, SSR 70 Auto, Kymco Mongoose 90, Honda Four Trax 300
	0

05-20-2023, 06:04 PM	#6
letsride Join Date: Oct 2013 Location: Leesville SC Posts: 832	Thanks alot Dan, that explains it nicely. I don't remember seeing any oil in the inspection plugs on the Brozz. But that may be due to the attitude of the bike when I was working on it. And the Kpx was leaned more to the stator side today. __________________ My Stable- 2022 Lifan KPX250 , 2023 Royal Enfield Himalayan, 1992 Honda GL1500 Goldwing, SSR 70 Auto, Kymco Mongoose 90, Honda Four Trax 300
	0

05-20-2023, 02:27 PM	#3
J4Fun Join Date: May 2021 Posts: 289	Just a thought here, everything looks normal to me! The spark plug shows lean and on your bike I would think that’s normal too…for fun check your chain tension
	0

05-20-2023, 07:55 PM	#7
XLsior Join Date: Aug 2020 Location: Australia Posts: 1,294	If it isn't marking its territory I wouldn't worry to much about an oil leak...
	1