Post by barneyrubble on May 23, 2013 6:00:14 GMT -5
Thanks for the board.
Here's my situation: I have a Honda Dio AF34. I bought it used and it ran pretty good for about a year; over time it started losing power. Shop guy said, "Stop running cheap oil, replace the muffler, and it'll be fine." He was right.
A year later, some thing, only more significant, like just barely crawling up hills it used to go up at 40 KPH. Went back to the guy, turned out to the carb (air screw frozen solid). He gave me a used one off an ZX. Problem mostly solved.
I decided to put a 70cc BBK on with a new expansion chamber muffler. After fiddling around with jets I got it running pretty good, so I made some changes to the clutch contra spring and put in some sliders. And life was great for a few months. [Just a little bragging - I have no idea how fast it'll go but enough to keep up with traffic at partial throttle.]
Tuesday going to work I notice that it felt sluggish going up a hill it raced up the day before. (Sluggish means it was felt like it was losing power). By the time I got the traffic light at the top, it would barely stay running at half throttle, but then it quit and wouldn't start.
I changed the spark plug, didn't help. I took the carb off and cleaned it, didn't help. I squirted gas in the cylinder, didn't help. It acted like it wanted to start, but just couldn't keep going - as soon as I released the start button, it died. Then out the of blue it started. I took it for a little ride and just as I was turning around to go back home it quit again. (On the ride, the power was still down and it wouldn't rev up like it used to.)
Pushed it home and started going through everything:
1) It has compression (I don't know how much, but probably as much as it had before)
2) The piston and the rings are OK. AND they were soaked in gas.
3) I found a small cut in my gas line that WAS leaking and fixed it. Plenty of gas at the carb.
4) I put in a brand new spark plug. It has spark, but I don't know how much is enough.
5) The shop guy gave me 2 different CDIs to try and both produce the same amount of spark.
6) I took off the air cleaner (so it's not an air restriction)
7) I took out the reed valves and they're OK.
8) I took off the muffler and it's OK.
It back-fired once, but since then, nothing.
The only things I can think of that I haven't tried are: stator, ignition coil, engine seals. I don't think it could be an engine seal, but feel free to correct me if I'm wrong, it wouldn't have or maintain compression without a seal, right? The whole case is under compression when things are working correctly, I think.
What should the spark look like? I get a small blue colored spark.
Any ideas on what it could be?
Thanks in advance.
Here's my situation: I have a Honda Dio AF34. I bought it used and it ran pretty good for about a year; over time it started losing power. Shop guy said, "Stop running cheap oil, replace the muffler, and it'll be fine." He was right.
A year later, some thing, only more significant, like just barely crawling up hills it used to go up at 40 KPH. Went back to the guy, turned out to the carb (air screw frozen solid). He gave me a used one off an ZX. Problem mostly solved.
I decided to put a 70cc BBK on with a new expansion chamber muffler. After fiddling around with jets I got it running pretty good, so I made some changes to the clutch contra spring and put in some sliders. And life was great for a few months. [Just a little bragging - I have no idea how fast it'll go but enough to keep up with traffic at partial throttle.]
Tuesday going to work I notice that it felt sluggish going up a hill it raced up the day before. (Sluggish means it was felt like it was losing power). By the time I got the traffic light at the top, it would barely stay running at half throttle, but then it quit and wouldn't start.
I changed the spark plug, didn't help. I took the carb off and cleaned it, didn't help. I squirted gas in the cylinder, didn't help. It acted like it wanted to start, but just couldn't keep going - as soon as I released the start button, it died. Then out the of blue it started. I took it for a little ride and just as I was turning around to go back home it quit again. (On the ride, the power was still down and it wouldn't rev up like it used to.)
Pushed it home and started going through everything:
1) It has compression (I don't know how much, but probably as much as it had before)
2) The piston and the rings are OK. AND they were soaked in gas.
3) I found a small cut in my gas line that WAS leaking and fixed it. Plenty of gas at the carb.
4) I put in a brand new spark plug. It has spark, but I don't know how much is enough.
5) The shop guy gave me 2 different CDIs to try and both produce the same amount of spark.
6) I took off the air cleaner (so it's not an air restriction)
7) I took out the reed valves and they're OK.
8) I took off the muffler and it's OK.
It back-fired once, but since then, nothing.
The only things I can think of that I haven't tried are: stator, ignition coil, engine seals. I don't think it could be an engine seal, but feel free to correct me if I'm wrong, it wouldn't have or maintain compression without a seal, right? The whole case is under compression when things are working correctly, I think.
What should the spark look like? I get a small blue colored spark.
Any ideas on what it could be?
Thanks in advance.
..BAD TO THE BONE..
main and 38 pilot. And yes, I have tried changing the air ratio screw, but it always runs best at the same setting.
it has absolutely no power and runs like crap. If I go down to 
, it's got plenty of power, but it gets 'burning oil smell' hot. I I think the main jet is OK. I have done a couple of different plug chops and it always been to look best and run best the way it is.