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Dirt Bike Discussions By Brand
Dirt Bike Brands - Other
Changing Mix Ratio and Jetting
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[QUOTE="KTMKRAZY2, post: 26337, member: 22241"] Since when is 32:1 leaner than 50:1 guys, come on! 32:1 is a richer fuel-oil mixture and may or may not, depending on the type of oil you are mixxing, require you to change your jetting. A high quality oil can normaly be mixed at 40:1 to 50:1 with adequate lubrication of your rod and main bearings. A petroleum base will generally require a richer mixture for equivalant lubrication. Don't get fuel-oil mixture mixxed up with fuel-air mixture as they are 2 different entities. The fuel-oil mixture is for bearing lubrication and ring seal, and the air-fuel mixture is for clean, efficient combustion without excessive temperatures in the cobustion chamber. It is very possible to get a rich looking plug reading and still be running a too lean fuel-air mixture in your combustion chamber due to an excessive amount of unburned hydrocarbons left on the plug. This comes from a too rich fuel-oil mixture. In my KTM250 I've settled on belray H1R at 50:1 with a 175main and a 42 pilot. If I am going to be hill climbing or riding sand all day I usually bump up to a 178 main. My elevation is normally 2000-2500ft. Why are you thinking of going to 32:1? ------------------ [/QUOTE]
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Dirt Bike Discussions By Brand
Dirt Bike Brands - Other
Changing Mix Ratio and Jetting
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