pre mix oil
- Thread starter Blaster 01
- Start date
A jet is a volumetric metering orifice. The hole is a certain size to allow a maximum amount of whatever you're trying to get through it, to go through it. Oil burns as a by-product of the operation of the 2 stroke, not as a main component but with a premix system, part of what's going through the main jet is oil. You have to supply enough gasoline to keep the mixture correct and the engine cool. Oil does not do that job only gasoline does. If you are limiting the amount of gas and oil that can go into the engine and you raise the ratio of oil to gas (go from a perfectly tuned engine running on 50:1 oil to running that same engine without any jetting changes on 32:1) you have starved the engine of fuel. You have dangerously leaned the engine inadvertantly causing cylinder temps to rise because of the lack of latent heat absorbtion due to phase change. A leaner and hotter mixture is more likely to detonate raising the cylinder temperature even closer to the magical point where the piston crown is too hot for the oil film to properly coat the skirts. Once the oil film breaks down, the piston galls to the cylinder increasing friction and heat exponentially and eventually locking up the engine.
The moral of the story is, pick a good 2 stroke oil (whatever brand you feel comfy with because opinions are like a$$holes, everybody has one and they all stink), mix it in a ratio you feel comfortable with (somewhere between 32:1 and 50:1 depending on the oil and your riding style), jet your bike properly, and stick with your decision.
DO NOT CHANGE YOUR OIL MIXTURE RATIO TO COMPENSATE FOR IMPROPER JETTING. <--- I feel that caps letters really drives the point home for those who can't wrap their heads around the rest of the post...
The moral of the story is, pick a good 2 stroke oil (whatever brand you feel comfy with because opinions are like a$$holes, everybody has one and they all stink), mix it in a ratio you feel comfortable with (somewhere between 32:1 and 50:1 depending on the oil and your riding style), jet your bike properly, and stick with your decision.
DO NOT CHANGE YOUR OIL MIXTURE RATIO TO COMPENSATE FOR IMPROPER JETTING. <--- I feel that caps letters really drives the point home for those who can't wrap their heads around the rest of the post...
