1985 ATC250R jetting
#1
1985 ATC250R jetting
I have an 85 ATC250R and it has recently been rebuilt. I rode it for a while and it fouled out almost instantly, I dropped the jetting down 2 sizes to a 135 and it fouled out after about a half gallon of gas (32:1 mix). Should I try a smaller jet (I dont have a set, i have to buy them individually) or could that lean it out to much? Where are the needles and float supposed to be set?
I havent had the jetting right in this piece since I got it. I enjoy the 10 minutes of riding I get at a time, the thing absolutely flys; Im just wanting a bit more than 10 minutes at a time without swapping 3 dollar a pop plugs.
I havent had the jetting right in this piece since I got it. I enjoy the 10 minutes of riding I get at a time, the thing absolutely flys; Im just wanting a bit more than 10 minutes at a time without swapping 3 dollar a pop plugs.
#3
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#5
1985 ATC250R jetting
Originally posted by: CRRobinsonRacing
Yes keep going with a smaller. A smaller pilot jet should help because the hondas come stock with the jets too big. It wont hurt a thing for you to keep going smaller on the jets.
Yes keep going with a smaller. A smaller pilot jet should help because the hondas come stock with the jets too big. It wont hurt a thing for you to keep going smaller on the jets.
#7
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#8
1985 ATC250R jetting
Try replacing the needle jet set. The jet needle, and the needle jet may be worn, you can't see it, unless you have a new needle next to the old one looking at them with a magnifying glass. Same way with the needle jet.
Like I say, replace them both, don't just pull out your throttle slide and drop a new needle in expecting the problem to be solved. Remove the main jet and replace the needle jet also.
Sounds to me like this is what is happening, with both components worn, it is way out of calibration from 1/8 to 7/8 throttle opening causing the plug to foul.
I believe factory jetting was a 150 main jet and a 48 pilot jet, just for reference
----- Gimpster -----
Like I say, replace them both, don't just pull out your throttle slide and drop a new needle in expecting the problem to be solved. Remove the main jet and replace the needle jet also.
Sounds to me like this is what is happening, with both components worn, it is way out of calibration from 1/8 to 7/8 throttle opening causing the plug to foul.
I believe factory jetting was a 150 main jet and a 48 pilot jet, just for reference
----- Gimpster -----
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