Latest posts for the topic "Fuel Mixture for kx 100"

Fuel Mixture for kx 100

Anonymous — GMT

Anyone know the fuel mixture ratio for a kx 100? I couldn't google it and I'm too lazy to find the owner's manual. Thanks!

TenEightySalomon — GMT

32:1 will do just fine. Rejet also.

octanemotowrench — GMT

Sven is correct, don't run less than 32:1.

MXRacer416 — GMT

I run 40:1 in my kx100

lumpy790 — GMT

It depends on the oil!

Anonymous — GMT

lumpy790 wrote:

It depends on the oil!

Lumpy my friend.... I respect you quite alot as you know, but on this you and I disagree. I don't care what kind of oil you run, using less oil than 32:1 in a small-bore is asking for trouble. -Steve

lumpy790 — GMT

At least we agree to disagree 8) But at least we mostly agree. Why is it that different oils have different recomendations? Some say 20, 32, 40, 50 or even 100/1 Wouldnt the ones with 50 or 100/1 sell more oil if they just had you dump more in when it is not needed? Its not how much you put in its how long it sticks to the metal surface. Every manufacturer has done 1000's of hours testing to see how well their oils perform at different ratios. They compare wear and horsepower Sure you can put more than you need but why? I pulled this from Spectro's web site..... Golden Spectro Pre-Mix is recommended for use in all high-performance, two-cycle engines where extreme load conditions and temperatures are expected. When mixing with gasoline, add 12 oz. of oil to four to six gallons of gasoline, depending on the size of the bike and the riding conditions. Golden Spectro is compatible with conventional petroleum oil-gas mixtures, so no special steps need to be taken when switching to Golden Spectro. Remember: Most manufacturers assume you are using an "all purpose" two-stroke oil when recommending a pre-mix ratio. With Golden Spectro, ratios of 42:1 to 64:1 are optimum, and ratios 100:1 routinely pass lubricity tests due to its superior film strength.

Anonymous — GMT

I see your point, but oil in the fuel on a two stroke is not mainly about lubricity. That is only part of the reason. Good lubricity can be had with 50:1 or even less. The oil is where the ring seal comes from. More oil = more ring seal. More ring seal = more power. Time and time again dyno tests have been done that show more oil in the fuel creates more power. Maximum power is had at usually around 18:1. Kart racers are sticklets for maximum power because of how strict their engine rule package is. If there was an advanage to running 50:1 or 100:1 they would do it in a heartbeat. Go to a kart race and check fuel mix ratios. You'll find that most are at 18:1 to 22:1. There is a reason for that. Power. -Steve

lumpy790 — GMT

I have heard/Read this story before but I for 1 do not buy it. That much oil would create more drag from gumming up. = less HP. Why isnt there a cloud behind RC, CR, JS & TP ? The factorys shure would do something as simple as that if it gave them more HP. So why dont the oil manufacturers tell you to use more to get more HP and as a side bennefit they sell more? They don't and since when have the oil companies done anything but do what would make them more $$$ ???

Anonymous — GMT

lumpy790 wrote:

I have heard/Read this story before but I for 1 do not buy it. That much oil would create more drag from gumming up. = less HP.

Tell ya what... Next time you are in the area, give me a yell, and we'll hit a track. We'll mix up some 20:1 fuel/oil and go for a ride. Let me do the jetting and set the plug. Thicker mixes like 20:1 work better under the more agressive riders, but with good jetting can be made to work for anyone. Most people will be fine between 32:1 and 50:1 tho. Because I'm not the fastest rider, and I tend to ride a more casual pace these days, I mix at 40:1 in my 200. But I would have no problems going to 20:1 for a day to prove a point.

Why isnt there a cloud behind RC, CR, JS & TP ? The factorys shure would do something as simple as that if it gave them more HP.

Simple. They ride hard enough to burn the oil. An expert running the engine under a full load with proper carb jetting will develop combustion chamber temps that will cleanly burn the heavier oil mix.

So why dont the oil manufacturers tell you to use more to get more HP and as a side bennefit they sell more? They don't and since when have the oil companies done anything but do what would make them more $$$ ???

Ever read the series of articles Dick Lechein did for several of the Hi-Torque mags back in the late80's/early 90's? He was pushing EXACTLY that. -Steve

Grizzly600 — GMT

moto814 wrote:

lumpy790 wrote:

I have heard/Read this story before but I for 1 do not buy it. That much oil would create more drag from gumming up. = less HP.
Tell ya what... Next time you are in the area, give me a yell, and we'll hit a track. We'll mix up some 20:1 fuel/oil and go for a ride. Let me do the jetting and set the plug. Thicker mixes like 20:1 work better under the more agressive riders, but with good jetting can be made to work for anyone. Most people will be fine between 32:1 and 50:1 tho. Because I'm not the fastest rider, and I tend to ride a more casual pace these days, I mix at 40:1 in my 200. But I would have no problems going to 20:1 for a day to prove a point.
Why isnt there a cloud behind RC, CR, JS & TP ? The factorys shure would do something as simple as that if it gave them more HP.
Simple. They ride hard enough to burn the oil. An expert running the engine under a full load with proper carb jetting will develop combustion chamber temps that will cleanly burn the heavier oil mix.
So why dont the oil manufacturers tell you to use more to get more HP and as a side bennefit they sell more? They don't and since when have the oil companies done anything but do what would make them more $$$ ???
Ever read the series of articles Dick Lechein did for several of the Hi-Torque mags back in the late80's/early 90's? He was pushing EXACTLY that. -Steve

whats that i smell? It must be a challenge 8)

Anonymous — GMT

Grizzly600 wrote:

whats that i smell? It must be a challenge 8)

Nah more like good premix... ;) -Steve

Grizzly600 — GMT

thats it! smells like some sort of....*sniff*....maxima...and...*sniff*...hmmm maybe a vanilla glade plugin? Let us know if you two ever do a "ratio shootout" i would like to know the winner. :wink:

Anonymous — GMT

I can tell you the results now. We both will win, and both will run good. Over time, the cylinder that has more oil in the mix will have it's top ends and cranks last marginally longer. Being that Lumpy and I both know how to jet properly, we could make either mixture run correctly. The HP numbers gained from more oil will be minute (less than one HP). Lumpy will go away from it thinking that he won the debate, and I will go away from it thinking that I won the debate. And we will both be right. Then we will go to a sports bar and fill ourselves on some great wings! -Steve

Grizzly600 — GMT

moto814 wrote:

I can tell you the results now. We both will win, and both will run good. Over time, the cylinder that has more oil in the mix will have it's top ends and cranks last marginally longer. Being that Lumpy and I both know how to jet properly, we could make either mixture run correctly. The HP numbers gained from more oil will be minute (less than one HP). Lumpy will go away from it thinking that he won the debate, and I will go away from it thinking that I won the debate. And we will both be right. Then we will go to a sports bar and fill ourselves on some great wings! -Steve

haha steve- "man i so beat you" lumpy- "no way i totaly won" ...ect Well thats still good. I saw an article on dirtbike.com from zenith, it said the same thing, they tested all the way down to 18:1 and only lost a total of 3-4% wich i think they said was 3 hp. So what your saying sounds right on track. I wich zenith and spank's (spanky) was still here, those guys post some usefull articles. thats the smell!...wings :lol:

Derek — GMT

Spanks is having a few problems, he lives in the area where that massive hurricane hit in florida. Plus his family is going through a rough time. Thats why he doesn't post.

TenEightySalomon — GMT

That's too bad. I knew Spanks was havin' a few problems, but I wish all well for him.

Goatours — GMT

Grizzly600 wrote:

moto814 wrote:

lumpy790 wrote:

I have heard/Read this story before but I for 1 do not buy it. That much oil would create more drag from gumming up. = less HP.
Tell ya what... Next time you are in the area, give me a yell, and we'll hit a track. We'll mix up some 20:1 fuel/oil and go for a ride. Let me do the jetting and set the plug. Thicker mixes like 20:1 work better under the more agressive riders, but with good jetting can be made to work for anyone. Most people will be fine between 32:1 and 50:1 tho. Because I'm not the fastest rider, and I tend to ride a more casual pace these days, I mix at 40:1 in my 200. But I would have no problems going to 20:1 for a day to prove a point.
Why isnt there a cloud behind RC, CR, JS & TP ? The factorys shure would do something as simple as that if it gave them more HP.
Simple. They ride hard enough to burn the oil. An expert running the engine under a full load with proper carb jetting will develop combustion chamber temps that will cleanly burn the heavier oil mix.
So why dont the oil manufacturers tell you to use more to get more HP and as a side bennefit they sell more? They don't and since when have the oil companies done anything but do what would make them more $$$ ???
Ever read the series of articles Dick Lechein did for several of the Hi-Torque mags back in the late80's/early 90's? He was pushing EXACTLY that. -Steve
whats that i smell? It must be a challenge 8)

:idea: Yawls ever burn moth balls in yer tank? :twisted:

Zenith — GMT

spanks was the one who did that test and as Steve said PLENTY of others have done it and the result is always the same, more oil = more power up to about 16-18:1. I'm running 27:1 without so much as a puff of smoke and I know my bike is overly rich on all circuits. I'm pretty sure I could run 20:1 without any smoke, spooge or gumming up of whatever it is you think will gum up. As Steve alluded to the ratio you need to run has a lot more to do with how you ride then anything else IMO. I used to run 40:1 when I started out and would always find plenty of oil in the crank when I stripped it down. As I got quicker I switched to 32:1 but when I took my KX and YZ apart recently there was not a drop of residual oil sitting in the bottom of the crank. Sure the crank and everything has a light coating on it but there should have been a lot more. So I'm now running 27:1 (Castrol TTS). I'll strip it down in a couple of hours and see how much oil is down there. I only ride MX now on fairly fast tracks so more oil is what's needed, if I went back to woods riding I'm sure 27:1 would be far too much. Don't get the idea that 32:1 is some magical figure though, the only reason it was chosen over 33:1 or 31:1 etc. was because of some nice round amount of oil it gave to some quantity of fuel. 700ml of oil in my container gives me 27:1 so that's what I'm on. If necessary, next will be 24:1 because 800ml gives me that :P. What I'm saying is you shouldn't really just stick with some magical figure as you get faster or slower or change riding type. 32:1 wouldn't be a great ratio for a trials bike, or drag racing, or desert racing, or a pro on a 125 or a woods rider on a 250 etc etc. Keep an eye on the residual oil in the crank when you lift the cylinder off, you're looking for a puddle of oil at a depth that goes about 1/8" up the crank wheel.

Bullwinkle — GMT

That's good info Zenith.

TenEightySalomon — GMT

Very good post, glad to have you here Zenith.

lumpy790 — GMT

As I am old and slow now I should be able to get away with 200/1 :lol:

greasemonkey — GMT

Goatours wrote:

quote]
:idea: Yawls ever burn moth balls in yer tank? :twisted:
burning crushed up mothballs is stupid it raises the octone level up to an uncontrolable anount we did that to a friend of mine chevelle..will NEVER do that again one 1/4 race his motor was toast! so i will not do that ina dirt bike

Zenith — GMT

From the gasoline faq 6.20 Can mothballs increase octane? The legend of mothballs as an octane enhancer arose well before WWII when naphthalene was used as the active ingredient. Today, the majority of mothballs use para-dichlorobenzene in place of naphthalene, so choose carefully if you wish to experiment :-). There have been some concerns about the toxicity of para-dichlorobenzene, and naphthalene mothballs have again become popular. In the 1920s, typical gasoline octane ratings were 40-60 [11], and during the 1930s and 40s, the ratings increased by approximately 20 units as alkyl leads and improved refining processes became widespread [12]. Naphthalene has a blending motor octane number of 90 [52], so the addition of a significant amount of mothballs could increase the octane, and they were soluble in gasoline. The amount usually required to appreciably increase the octane also had some adverse effects. The most obvious was due to the high melting point ( 80C ), when the fuel evaporated the naphthalene would precipitate out, blocking jets and filters. With modern gasolines, naphthalene is more likely to reduce the octane rating, and the amount required for low octane fuels will also create operational and emissions problems.

octanemotowrench — GMT

Anonymous wrote:

Time and time again dyno tests have been done that show more oil in the fuel creates more power. Maximum power is had at usually around 18:1. Kart racers are sticklets for maximum power because of how strict their engine rule package is. If there was an advanage to running 50:1 or 100:1 they would do it in a heartbeat. Go to a kart race and check fuel mix ratios. You'll find that most are at 18:1 to 22:1. There is a reason for that. Power. -Steve

That's right, every rotax guy at the track runs 18:1. It's so strict that there's only a small selection of jets you can use etc.