bdf136
03-23-2008, 12:51 PM
OK,
I just bought an '85 ATC 250R and I'm trying to get it back to running at it's best.
When I first got it, midrange was a bit shakey. So here is what I did to it.
- Cleaned the airfilter (it was caked in heavy oil)
- Flushed the coolant
- Thoroughly cleaned the carb (it had a 142 in it, but I replaced it with a 148)
- Drained the gas and started running 50:1 Fully synthetic Amsoil in it mixed with 93 octane.
It now runs a lot better, but I think there is still something a little funky on the bottom end to mid. I was going up a little hill on a trail yesterday and I almost didn't make it because I had to get off the gas for a second to avoid a rock. The revs were really low and it barely pulled out of it. Should I think about just putting a smaller front sprocket on it? I honestly don't know what size I have on it now. It's probably stock though.
It also takes about 20 minutes for the engine to run right. When I first start it up, it misses at the mid and top end. When the engine is really warm and I keep it in high revs, it runs great. However, you must be either accelerating or decelerating. There is no in between.
I am somewhat new to the two-stroke world, so I don't know if I'm just not used to the powerband yet. But I do feel like there should be a bit more umph on the low to midrange.
Any suggestions would be much appreciated. Thank you!
----------------------------------------
Long Live the R
I just bought an '85 ATC 250R and I'm trying to get it back to running at it's best.
When I first got it, midrange was a bit shakey. So here is what I did to it.
- Cleaned the airfilter (it was caked in heavy oil)
- Flushed the coolant
- Thoroughly cleaned the carb (it had a 142 in it, but I replaced it with a 148)
- Drained the gas and started running 50:1 Fully synthetic Amsoil in it mixed with 93 octane.
It now runs a lot better, but I think there is still something a little funky on the bottom end to mid. I was going up a little hill on a trail yesterday and I almost didn't make it because I had to get off the gas for a second to avoid a rock. The revs were really low and it barely pulled out of it. Should I think about just putting a smaller front sprocket on it? I honestly don't know what size I have on it now. It's probably stock though.
It also takes about 20 minutes for the engine to run right. When I first start it up, it misses at the mid and top end. When the engine is really warm and I keep it in high revs, it runs great. However, you must be either accelerating or decelerating. There is no in between.
I am somewhat new to the two-stroke world, so I don't know if I'm just not used to the powerband yet. But I do feel like there should be a bit more umph on the low to midrange.
Any suggestions would be much appreciated. Thank you!
----------------------------------------
Long Live the R