Maintenance & Technical > KX500 Original
premix ratio
Polar-Bus:
--- Quote from: 81cr450 on January 11, 2012, 06:50:02 AM ---
--- Quote from: kwakman on January 11, 2012, 12:48:14 AM ---im sticking with 32:1 as it wont hurt on the road. some good info on that maxima page.K.
--- End quote ---
I agree whole thoroughly 32:1 & safe, besides plugs are alot cheaper than motor builds
--- End quote ---
A common misconception is that you will foul a plug quicker running 32:1 vs say 50:1 . This is technically false. It's the jetting that determines if and when a plug will foul not the oil ratio . Engines need to be jetted richer when running richer premix ratios ex. ( 32:1). The added oil content slows down the flow of fuel through the jets, adversely a leaner ratio like 50:1 can be jetted leaner as the fuel will flow faster through the jets. All the bike mfg's advise 32:1 based upon the assumption that you are a expert level MX racer who will be holding the throttle WFO for 30 min straight out for two motos on sundays. Kawasaki also prudently advises a 32:1 ratio (and overly rich jetting) because they don't want to see your brand new KX### blown up the first month you own it. This is why KX's generally run pig rich from the factory (especially when ridden by a weekend sport rider) . It's all preference, 32:1 is fine (your just wasting $$ buying extra oil IMO) and 50:1 is fine as well. I'll say it again, more importantly than premix ratios is the need to keep your air filter clean !
81cr450:
The leaner oil mix does need to be jetted leaner for sure as it increases the amount of fuel by a pecentage, depending on ratio. Its mixed by the gallon, you have a gallon whether its 24:1 or a 100:1. The 100:1 is more fuel & less oil you lean it out due to more fuel being there to burn.
Any watch kx500 youtube videos. Listen to the sound, "Most" people dont rev them. The moment the powervalves start to open, shift. They should mix 100:1.
When you pull your motor down look at the width of the oil band in the bottom of the case, all the drainback from whats coated your parts. Thank for the tip on this by the way, you know who you are.
This pool, or the oil retained is what loads up & fouls plugs if your running to rich of oil ratio. Like when you let your girlfriend drive it & then you have to "blow it out" cause shes not spinning it high enough to match the load to the oil mix ratio. Ideally you'd have 100:1 at idle, 50:1 when the powervalves open, 32:1 @ WOT & if WOT is sustained for more than 30 seconds the ratio drops to 24:1. Like the chart posted on maxima, mix being rpm / load based you need to figure it on your rpm range. A track bike being one end & a dune / desert bike being the other.
Sounds like it would help if people posted mix ratio & type of riding as well, plug life, & time hours between rebuilds
royceymon@hotmail.co.uk:
i run 40:1 with rock oil fully synthetic racing synthesis 2 ,ive run the same oil since 87 never had any problems even on the kx500s i had all run with thier necks rung! not only more oil less fuel through the jet but i dont run too weak on the oil front for the cooling properties and lubrication ,i dont have any plug problems or oiling up .
on the single ring piston im running at the mo the ring is wore out already , i think ive only done about 10 hours max i know someone who knocks one out after 5 hours! so i guess 10 hrs is good
defo agree filter more important than anything
Big Yac:
just like using a quality premix is important, a quality air filter oil is important too. You want something that wont get sucked into the engine or restrict air flow yet be easy to clean. Myself, I like Maxima FFT. It comes out thin like water so you can get it spread around and then after a few minutes it get nice and tacky. Bel Ray seems to make a good foam filter oil too. I know they say not to use gas to clean your filters but I use kerosene followed by a rinse in soapy water and then clean water and the filters look like new. I clean the filter after every ride.
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