Post by kliff on Mar 6, 2009 8:07:06 GMT -5
And sometimes forgotten if not passed along. I learned this, "the hard way," about 30 years ago. Just thought I'd pass it along.
For "PRE-MIXXERS only."
Oil mix ratios affect jetting. Oil mixxed with your fuel is a lubricant, it displaces the fuel.
So consider this.
You normally run a 50:1 mix, and have set up and jetted accordingly.
But for whatever reason, you decide today you need a 24:1 mix. It's gonna be exceedingly hot, you're gonna do a lot of WOT operating....whatever. BAD IDEA, unless you rejet!
At 24:1, you have substituted oil for fuel, you just leaned out the mixture. Yeah it's smoky....but cylinder temps will climb, and you risk a hot seizure. Only to be left scratching your head, trying to figure out why.
Remember, pre-mix ratios and jetting sizes work and in hand. Select a ratio, and jet accordingly. Change p-m ratios, rejet.
KISS, but play it safe.
Don't ask, about how I figurred all this out, but it wasn't because someone told me first....dammit!
For "PRE-MIXXERS only."
Oil mix ratios affect jetting. Oil mixxed with your fuel is a lubricant, it displaces the fuel.
So consider this.
You normally run a 50:1 mix, and have set up and jetted accordingly.
But for whatever reason, you decide today you need a 24:1 mix. It's gonna be exceedingly hot, you're gonna do a lot of WOT operating....whatever. BAD IDEA, unless you rejet!
At 24:1, you have substituted oil for fuel, you just leaned out the mixture. Yeah it's smoky....but cylinder temps will climb, and you risk a hot seizure. Only to be left scratching your head, trying to figure out why.
Remember, pre-mix ratios and jetting sizes work and in hand. Select a ratio, and jet accordingly. Change p-m ratios, rejet.
KISS, but play it safe.
Don't ask, about how I figurred all this out, but it wasn't because someone told me first....dammit!
