Amsoil tarnishes the jets, and their 100:1 ratio recommendation is ludicrous. It seems to be a fairly clean burning oil until you start mixing it in real-world ratios, like 32:1, then it starts to produce a lot of spooge, even in well jetted bikes. I'll never use it again.
The amsoil is proven in some 4 strokes. The 20w/50 works well in in the XR400s. Some of the racing teams in Australia use amsoil, even though they have sponsorship for other products. This was in response to regular bottom end failures. amsoil has been around along time and aprt from the last 2 years unchanged.
In the Husky CR50 we starting use it at 50:1. This bike has in my opinion premature bottom end failures. If the CR50 should still be intact by the end of they then the oil has probably done its job.
On our '00 yz125 and '01 yz250 we use the Yamaha R2 product.
It confuses me when the oil bottle says one thing and the manufacturer says another ratio. I needed premix a couple of weeks ago, and it was to late to get to the bike shop. There is a used bike/service shop by the house and the only premix he had was the 100:1 Amsoil. He said to run it at 100:1 and claimed he had good luck with it. I was nervous about using it, but was in a pinch, so I ran about a tank through the bike. It smoked less, as he said it would, but I got rid of the rest of it and went back to the Honda HP at 32:1. Is it safe to run oil at the ratio on the bottle or should you stick to what the manual says? I guess it probably depends on the oil, but would like some feedback from somebody who knows.
Most oil bottles give you a range of ratios to use, depending on your riding conditions, and the amount of oil per gallon neccessary for that ratio. The Amsoil smokes a lot less at 100:1 simply because there is a lot less oil in the mix. I run Yamalube 2R at 32:1 in my bike, with very little smoke or spooge. I would never run less than this in a 250, and I would run at least 26:1 in a 125. More oil in the mix provides better protection, and a better cylinder seal, for more power and better running. Once you settle on an oil and a ratio, you can begin jetting the carb properly. A properly jetted bike won't spooge or smoke a lot once it is at operating temperature.
100:1 oil ratios were developed originally for fishing boats. They spend long periods of time at idle, then slam the throttle wide open to get to another spot quickly. All the oil that would build up in the crankcase while idling would get slammed into the cylinders when the throttle was opened, with predictable results.
Does Amsoil still sell the 2 Cycle 100:1 oil? Years ago I used the 100:1 Amsoil in weed eaters and chainsaws and a couple of older two stroke trail bikes. Never had any problems. Amsoil does have a Series 2000 2 Cycle oil that is designed for 50:1 ratio. It's the stuff LaRocco uses. I have been using the Series 2000 Amsoil mixed at 50:1 exclusively in my 01' GasGas XC250 (after break in of course). Prior to that I used it in my KDX without a hitch. I ride in hot, dry Southern Idaho condtions. Low spooge, less smoke and more power than when using standard petroleum based 2 Cycle oils at 32:1. http://www.amsoil.com/products/twocycle/index.htm
I run Amsoil in all my vehicles and have never had a failure. It's expensive, but worth it. Nope... I'm not a salesman, it's just good stuff.
I have had good results with the Series 2000 at 40:1 mixed with C12. I have used it in my chainsaw, KX500, and KX250 (now 310) for two years. I have always found a good coating of oil on the lower end bearings on tear down even after months of non use before tear down. The light ash on top of the pistons has always been easily scraped off with my finger nail and the power valves stay fairly clean. I have had zero problems with spooge and the silencer packing has also been clean. The first 5 gallons through the 310 has been mixed at 32:1, but after the initial break in I am going back to 40:1 for the extra fuel mileage it offers. Let me state that I do not tend to ride motocross, if you do you may want to run 32:1. I tend to run my bikes at the leaner end due to the elevation changes I face where I ride, I have not had any problems, but that's just me, I don't suggest doing as I do. On a stupid meaningless note I like the way it smells. :silly:
Me too... but my riding buddies sure don't seem to. They say it stinks... But if they are complaining about my exhaust smell, the complaints must really stem from the fact that they are chasing..... :p
Spanky250: How long was the time frrame it too to tarnish your jets? That ratio does sound crazy 100:1.It mkes sense for the boat engines.
TR: I have a four stroke so that sounds good. Did the cr50 have premature problems because of the mix you think or did the oil help? Yamaha does make good products in my opinion. Thats what I've been using in my bike so far.
entangidahl: Do you follow the recomended time frame to change your oil and filter?Did you ever have to replace the piston and rings on the kdx? I think your right about your buddies. Ride it like you stole it!!!:p
KXaggerator:Why do you mix it at 40:1?Have you noticed any extended time frame between top end rebuilds?
400F Man, the crank failure on the CR50 is a mystery. Both main bearings and the big end bearing were worn. The piston and rings were still servicable. The crank had blue colouration around the big end area. This is similar to what happens when welding metal. I suspect the crank suffered from oil failure and overheated.
We are only using R2 because we have lots of it. Eventually we will try to standarize on the same oil for all the bikes.
100:1 = 1%
50:1 = 2%
25:1 = 4%
What do you think matters the most: quality or quantity ? In my opinion the quality is what matters most.
What oil are you refering too? I had tarnishing problems with Redline, thats why I switched to Amsoil Series 2000 @ 40:1. No tarnish, clean burning, great performance and fantastic top end life in a '00 GasGas 250 that is raced/ridden weekly. I assume you are refering to the old 100:1 stuff.
You are right. That is the only Amsoil product I ever tried, and that was 6-7 years ago. I didn't even know they had a different oil out on the market, I ignore the Amsoil bottles now. I am very happy with the Yamalube, so I see no need to start trying different oils.
Considering that 4% is 4 times as much oil as 1%, I don't see how you can shrug quantity off as being insignificant. There is a lot of evidence to support using high quantities of oil in the mix. The higher oil content produces better piston-to-cylinder sealing, resulting in measurably better engine performance.
The reason I run 40:1 is three fold. It is a compromise between fuel economy and engine protection, like I said I run as lean as I feel safe at lower elevations, this is also why I run C12. I do a lot of long hill climbs and ride with fast AA enduro guys, so needless to say I still work my engines pretty hard. Second 16 oz to 5 gallons is just too easy, as many oils come in .5 liter and 16 oz bottles ( I know .5 liters will not make 40:1, but it is close). Third, it has become the agreed to standard with my riding buddies, so we can share fuel on long rides without it effecting jetting. Though I do have a friend that brings extra oil to adjust his jetting if his bike starts to run ratty at higher elevations.
One of my friends uses Castrol A747 in his CR500AF. On the last ride with with him I made a down hill death pass through the brush to get away from the sickening stench. It is good oil, it is the most widely used oil in Grand Prix Bikes in Europe, but it stinks to heaven and goes for $21.95 a liter. I have had no luck trying to get him to change oil. Personally I find the Amsoil to have a slight castor oil aroma. I think it is common courtesy to run a good smelling oil for the sake of those that have to ride behind you on tight trails. From time to time you can find me putting my nose to the silencer of my bike as I walk through the garage; mmmm, smells like freedom. :confused: