Fuel Consumption?

[CHRIS_NM1]

Hi Guys I need some advice on this topic. I just bought my KX125 and took it out for a couple of hours of riding on Sunday. I was not sure how long I could ride before the tank was close to empty and it seemed to have gone through about 3/4 tank in about 8-9 miles of trail riding. My bike is completely stock with the exception of the previous owner going up on the main jet 1 size. He told me that when he rode it he was usually going at high speeds and so he changed the jetting in order to dump a little more fuel into the cylinder. He also ran a mix ratio of 25:1 and our elevation is about 5000ft. With the jetting change, would this cause me to burn fuel at a faster rate than normal when i was not riding near full speed? I would also like to know if the 25:1 ratio is too much oil in a 5 gallon can? After riding I noticed the oil spooge leaking from the tail pipe, I would assume this is normal right?
Thanks, Chris.

[chud]

A little oil coming out of the silencer is normal, but if it's running out, it's probably a result of rich jetting or the 25:1 mix ratio. I use 32:1 in my CR125, some people run 40:1, 50:1.

At 5,000 ft stock jetting is normally too rich. Was the previous owner also at 5,000 ft?

[CHRIS_NM1]

Yes he was at the same elevation. The oil out the tail pipe really is not running out but more like after I stopped riding then it leaked out enough to make a few drips of black oil on my garage floor. Maybe the mixture is too rich, guess I'll pull the plug to look at it. The performance was really good but I was just concerned with how fast the bike burned up 2 gallons of fuel.

[Dirtbikindad393]

Originally Posted by CHRIS_NM1

Yes he was at the same elevation. The oil out the tail pipe really is not running out but more like after I stopped riding then it leaked out enough to make a few drips of black oil on my garage floor. Maybe the mixture is too rich, guess I'll pull the plug to look at it. The performance was really good but I was just concerned with how fast the bike burned up 2 gallons of fuel.

Oil dripping on the garage floor is running out. I would change to 40:1 or even 50:1 but many people here have trouble wrapping their brain around 50:1. Sounds like the jetting could be rich but the best way to tell is to do some testing, jetting and plug readings. I would definitely get away from 25:1 thats too much oil.

[Freak]

I'll second that 25:1, that's nutz. Go 40:1 and keep an eye on that plug color. Your getting way to much spooge= too rich.

[Freak]

Go with a good oil too, something like Amsoil