2003 KX65 Oil Question

[Woody_393]

My son picked up a KX65 over the weekend and I've read the manual that comes with it (not too bad), but I've got some questions.

The guy that had it was running Maxima Super-M Premix, and though it seems to lube just fine, the bike smokes a lot and I'm pretty sure spoog is going to be a problem too.

In the past, I've used the Mobil1 synthetic 2 stroke oil and thought it was just fine and doesn't seem to smoke much. Spendy, but I believe it's really good oil.

What other options would any of you suggest?

Also, the book recommends 10w40 motor oil (non-moly of course), so I'm guessing just any standard Motorcycle specific oil should be fine.

I want to decide and get this all taken care of before we head to mesquite.

[yz250guy]

I've used both Maxima and Mobile1. I like the mobile1 better, but never had any problems with either of them. Just make sure you don't mix them. completely drain the old before changing oils, but I'm sure you already knew that.

As for the gear oil, I think you are fine with what you suggested.

Congratulations on the new steed.

[Dirtbikindad393]

Woody,

You know my answer to that.

What ratio was the guy running it at?

Jack has run the 2 stroke oil in his KTM's for almost 4 years now he doesn't smoke when the engine is warmed up and no spooge problems when run at the correct ratio being 50:1. You mostlikely will encounter spooge at 40:1 depending on how the throttle is worked. Jack also runs the 10W-40 motorcycle specific oil in the cases with no problems.

[Silver_Fox]

Originally Posted by Woody_393

My son picked up a KX65 over the weekend and I've read the manual that comes with it (not too bad), but I've got some questions.

The guy that had it was running Maxima Super-M Premix, and though it seems to lube just fine, the bike smokes a lot and I'm pretty sure spoog is going to be a problem too.

In the past, I've used the Mobil1 synthetic 2 stroke oil and thought it was just fine and doesn't seem to smoke much. Spendy, but I believe it's really good oil.

What other options would any of you suggest?

Also, the book recommends 10w40 motor oil (non-moly of course), so I'm guessing just any standard Motorcycle specific oil should be fine.

I want to decide and get this all taken care of before we head to mesquite.

Woody Woody Woody! You know better than to start a thread on oil, how about starting a thread on something less controversal like "what's faster a XR200 or a Blaster?"

[Silver_Fox]

Oops, I forgot to answer your question. When we had the kx65 I always used good quality synthetic mixed at 40:1, it only smoked during warm up then burned clean. You might want to check the jetting if it's smoking excessively.

[dklassen]

My son races MX with a 2004 KX65. We run Amsoil Dominator at 32:1 in his bike and my YZ250. We use Amsoil 10W40 in the crankcases. The 65 smokes a bit on start up but not excessively once warm. The 65 was rebuilt last spring with a Wiseco bottom end and OEM top end parts. After the rebuild the bike ran perfect all season. I'm not trying to sway anybody with my chosen brand. I use it because I can buy it for a decent price and it works.

[Woody_393]

Thanks for the advise.

I actually talked to a local mechanic that I know has had a lot of mini bikes (I see him at the track all the time with his boys). I asked him what he liked and what he ran.

He suggested AmsOil @ either 50:1 or 60:1 depending on what size gas jug he had (5 gallon or 2 gallon). I have a 2 gallon jug, so I ran it 60:1 (half a bottle to 2 gallons).

The bike ran great after we burned up the old stuff (had a full tank). It certainly smokes less with the AMsoil, but that's probably more to do with the ratio than anything. So Dane, I'll be getting in touch to get some more product so I don't run out.

Something odd though, before the switch, my son was going up a sand hill with lots of whoops, and the bike started to really smoke... Kinda like it got hot enough to start burning up the spooge that was in the exhaust port/pipe. He stopped and we let it cool, and it didn't do it again... Any thoughts?

[Dirtbikindad393]

2 strokes will smoke more under load . Its the same as a diesel pick up or a car the more load you put on the the more emissions they make. The smoking is the extra oil in the fuel (needlessly at 32:1) burning up without contributing to making power. That is why I urge people to run 50:1 its cleaner and still enough oil to do the job of lubing and cooling the top end especially with the Amsoil Dominator.

We have proven it here in the desert, racing at temps to 113 and at 50:1 mix ratio it still does the job.

I am glad the smokin cleared up for you. Now at some point in time you need to clean and adjust the power valve after running 32:1. It will help big time.

[Woody_393]

I mean it really smoked... from the tip of the silencer and from the front of the motor. I'm sure it was just built up goop, but it made me a little nervous.

Do these KX65's have power valves?

[Silver_Fox]

Originally Posted by Woody_393

Do these KX65's have power valves?

No power valve on the 65, the kx85 does.

[Woody_393]

Thanks, I didn't think it did.

[noobish]

I have found on our 65's (both kx's) the bottom end does not get enough lubrication with 40:1 or higher, we went back to 32:1 and jetted it accordingly and it doesnt smoke as much and the bottoms have longer lasting life. As for the transmission, I have found 10w-40 to be just fine but you need to change oil after every ride. I started using the Belray Gear Saver oil which is 80w transmission fluid and I can get about 3-4 rides before needing to change it. Also, since your bike was smoking so much when you got it, I am positive that the exhaust desperatley needs to be repacked.

[Woody_393]

Thanks for the info on the gas/oil ratio. I'll keep that in mind.

Also, the good news is the exhaust was just re-packed and he gave me all his extra re-packing stuff so I have all of that already.