BobPA wrote:
My 125 and 250 also get 32:1. I 100% agree you can see a jetting difference between 32:1 and 50:1.
BobPA wrote:
My 125 and 250 also get 32:1. I 100% agree you can see a jetting difference between 32:1 and 50:1.
Acidreamer wrote:
Rich/lean is air to fuel ratio. If your bike is spitting oil instead of burning it its getting too much gas and not enough ...more
Acidreamer wrote:
Rich/lean is air to fuel ratio. If your bike is spitting oil instead of burning it its getting too much gas and not enough air.
Compensating for bad jetting by changing the gas ratio is apparently what the previous owner did. Theres no reason to run 50:1 on a yz250 unless you want it to blow up due to lack of lubrication.
JBecker 72 wrote:
It's actually possible to have the bike running lean, and spitting a ton of oil. Try running a stock KTM 250SX that's jetted ...more
JBecker 72 wrote:
It's actually possible to have the bike running lean, and spitting a ton of oil. Try running a stock KTM 250SX that's jetted for 60:1 on 32:1.
Plenty of people run their 250 on less oil. I'm not one of them, but it's quite common with woods riders.
Not saying its impossible. The point is, yamaha engineers know their engine better than anyone else. They spec 32:1 to provide the correct amount of lubrication in the crank and cylinder. youre asking to blow the thing up by starving it of oil.
If you like the way the bike runs on 50:1, run your gas at 32:1 and jet for a leaner air fuel ratio to get the same effect. That way you get the lube and power.
When you get a 4 stroke remapped, they dont change the oil in the cylinder and crank. They adjust air/fuel ratio. Same principal for carb tuning.
IMO changing the fuel ratio is the lazy way out for trial and error testing to get good carb settings for your specific bike and track.
2009 Kawasaki KX450F
2009 Kawasaki KX250F
2002 Suzuki GSXR 600