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MX, SX & Off-Road Discussions
Dirt Bike Mods & Maintenance
Premix ratio vs. fuel/air ratio ?
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[QUOTE="oldfrt613, post: 969795, member: 62011"] I spend more time riding than most. Most of my fidgiting is at night. I probably ride 4-5 times a week, several hours at a time. I have my own motoxross track and 3.5 mile loop through the woods. As for the lower end bearing, my ex-tuner ( he's my ex tuner because he has turned to the dark side of 4-stroke world ) claims dirt is the number one cause, especially when the piston is ok. He claims that soft aluminum piston will be the first gotcha for a lubrication failure. As for increasing power with higher oil ratio's, it is true that increases have been proven due to better ring sealing in some tests, however there is a practical limit to how much oil can be added before spark plug fouling and premature power valve gumming. I belive most have agreed on ratio's of 32:1 to 50:1 are reasonable. My hopped up outboard runs 50:1 at sustained RPM's. Modern day lubricants can more than handle the task. But I digress. The focus of the thread was to clear up the effect of gas:oil ratio on carburator jetting, at least that was the impression I got. [/QUOTE]
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MX, SX & Off-Road Discussions
Dirt Bike Mods & Maintenance
Premix ratio vs. fuel/air ratio ?
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