what premix and what ratio

[KXT500]

i just bought a KX5 and need to know what to run. The previous owner ran Penzoil at 40:1. I have a cr500 and would never put penzoil in it 

I have always ran PJ1 goldfire synthetic at 40:1 but i am concerened about the powervalves on the kx.


so what is the best?

[Uzi9mm]

A lot of guys like Bel Ray H1R synthetic.  Its supposed to lube well and burn clean to help prevent buildup on the powervalve.  My KX500 manual (2002) says to mix at 32:1 but a lot of riders are mixing at 40:1.  I don't know whats best, I try to use recommendations from credible sources and read as many reviews as possible.  I use Bel Ray H1R Synthetic at 32:1 for now.  Good luck.

[BDI]

40:1 since 1991 no problems yet. who knows maybe something will rear it's ugly head some time in the next 17 years . I'm running maxximas K2 full sen It is an ester based oil just like H1r and as far as I can tell by looking, smelling and tasting it, it is the same stuff in a different bottle.

[Danger4u2]

2004 and a 2003 K5- Bel Ray H1R Synthetic at 40:1.

[Hillclimb#42]

44:1 with Klotz synthetic. PJ1 is good old school oil tho. Synthetics perform alot better IMO, or I believe they would have kept working on the formula. I think ur new pony will be fine with your ratio and oil.

[stock500]

I prefer Amsoil intercepter, because it is formulated for power valves.  I have been running 32:1.  I ran the same thing in my snowmobile, and my motor was clean as a whistle after 4,000 miles, and my power valves work perfectly with no stiking ever.  I bet you could safely run leaner with a good oil but I play it safe.

[Platypus]

Bel Ray MC-1 at 50:1 which is what they recommend and I have also read of several people here using that as well.  I have had my 2001 K5 for over a year now and no problems, it runs like a peach.

[Albertan]

I've run Motul in the past, at 40:1, but now I'm a big fan of Yamalube 2R.  It is reasonably priced, widely available, and most importantly, works well.  I have no problems with carbon build up, and the piston and head looked very clean at the last rebuild. 

[maddoggy]

40:1 since 1991 no problems yet. who knows maybe something will rear it's ugly head some time in the next 17 years . I'm running maxximas K2 full sen It is an ester based oil just like H1r and as far as I can tell by looking, smelling and tasting it, it is the same stuff in a different bottle.

i can tell you, after working for bel-ray in the past, that maxximas oil is not the same as bel-ray. maybe close but not the same. they spend years getting their formulas perfect at bel-ray. i don't get any benefits from saying this but in my opinion bel-ray products are top of the line and i would use anything they make on or in my bike. MADDOGGY

[hughes]

I've run Motul in the past, at 40:1, but now I'm a big fan of Yamalube 2R.  It is reasonably priced, widely available, and most importantly, works well.  I have no problems with carbon build up, and the piston and head looked very clean at the last rebuild. 

I'm another fan of Yamalube 2-R. By far the cleanest burning oil I have found. Power valves/piston domes/cylinder heads look brand new every time. Always mix 32:1 in my 500 and my YZ250.

[KX500freak]

my brand is castrol R2

that is german stuff and i would put it on the same level as bel ray ,
cause they are also in for the best product .

i mix it at 40 to 1 and never had issues doing so,
my manual says also 32 to 1 but it seems to much oil,
since oil is taking an amount of space in the mixture,
where there is too much oil , then there,s no fuel or air there ..

mine,s smoking excessively at lower mixture,s then 40 to 1
so the whole set up is for 40 to 1
spark,s good tan looking
clean port and exhaust

and that awesome fumes of it after a ride
i stick my nose in the muffler just to check the state of the engine ,
and i,m addicted by 2smoke

[KXcam22]

Do a search on this topic and you will find lots of background.  I ran Belray MC-1 at 60:1 in my K5 for 400 hrs (est), 14 years on original top end.  On rebuilt there was little wear and no carbon. Didn't even have to clean the powervalve.  Now that I live in 4 stroke land I run it at 200:1 for some extra top end life (and the nice smell). Time will tell if I am right (or wrong).  In my racing days I ran MC-1 at 85:1.  Good stuff. Cam.

[stewart]

h1r  at 50 to 1

[Arigato]

Yamalube 40:1.   

[augerman]

Bluemarble 100:1