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Post by hellish100 on Apr 11, 2023 20:40:17 GMT -5
Also, I've had intermittent issues cured by swapped CDI and/or coil.
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Post by captincvmn on Apr 15, 2023 14:48:34 GMT -5
I’ve swapped coils, I’ve swapped CDI’s, I’ve checked wires, I’ve swapped fuel hoses, I’ve had jetting all over the map.
One thing I have NOT tried is the voltage regulator. Could it be that at high rpm the voltage regulator is crapping out? I don’t use my battery for starting, it’s just kinda in there.
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Post by oldgeek on Apr 15, 2023 16:05:06 GMT -5
Not sure about the regulator, stranger things happen. Possibly the pickup mounted on the stator that fires the coil is acting up? What plug is it that you are using? Looks a little strange to me.
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Post by captincvmn on Apr 15, 2023 17:54:22 GMT -5
Not sure about the regulator, stranger things happen. Possibly the pickup mounted on the stator that fires the coil is acting up? What plug is it that you are using? Looks a little strange to me. NGK BR8HSA |
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Post by 190mech on Apr 15, 2023 20:51:15 GMT -5
Volt reg does not have any ignition interference with an AC CDI.
I think Scott has a good possibility about a failing pickup (trigger) coil, have seen that a few times...
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Post by captincvmn on Apr 16, 2023 19:38:21 GMT -5
Could it be low float level? As bike uses fuel the bowl gets low while waiting refilling? Damn thing is always fine from takeoff.
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Post by oldgeek on Apr 17, 2023 20:16:06 GMT -5
Are you able to do a video clip? I am really only interested in the audio portion, it may take some trial and error to get clear audio.
Where are your temps at when the misfire starts?
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Post by captincvmn on Apr 17, 2023 21:11:23 GMT -5
I took an audio the other day. I’ll attempt to make a YT video Tuesday. Temps? Well my temp gauge pickup lasted one run and broke the ring off. That data is unavailable at this time.
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Post by repherence2 on Apr 17, 2023 22:16:34 GMT -5
...Bike was breaking up at extended WOT. Seems to take off fine but once running awhile at WOT it starts dropping firings and gradually gets worse the longer it’s at WOT. Pull up to a stop sign and take off again and it’s fine until it settles down nicely at 40-45mph and WOT. Then it starts to miss slightly. Is this plug, too much fuel at WOT or fuel starvation? I’m still enjoying riding ‘round but this has me kinda stumped.
from what you describe, in my experience, i think that it is Fuel Starvation if it is at WOT.
are you running a vacuum petcock or a manual fuel shut off valve?
if you are running a vacuum petcock, are you running the stock size vacuum hose?
i am asking these questions because a long time ago, i read on another forum about Fuel Starvation on long WOT pulls. it was described that at WOT, the carb/intake does not have a strong vacuum signal as opposed to throttle positions less than WOT. so i ended up putting a larger hose nipple on my intake manifold so that i could run a bigger vacuum/fuel hose to my petcock. that worked for a little while. i have found that running transparent fuel/vacuum/oil lines are very helpful in troubleshooting fueling issues. so, back to the larger vacuum hose, the set up ran well for a while. however, over time, i got that WOT fueling issues again. after long WOT runs, with loss of power, i noticed that there was Fuel in my vacuum line for the vacuum operated petcock. that led me to believe that the petcock was no good. so i got rid of the vacuum petcock and replaced it with a manual shutoff valve. a few months ago, i swapped the stock engine back into SlowPed. i ran into WOT fueling issues again. this time, it was from crud and debris in the fuel tank/lines. i could see sludge in my fuel filter, it was one of those sintered brass filter elements. me being lazy and stubborn, i kept running it. until one day, the bike ran like crap at full throttle and i got tired of it. went to the r/c hobby shop, bought some some new Tygon yellow transparent fuel hose (it is rated for gasoline and nitromethane), went to O'Really's and bought a fuel filter from the lawn mower rack, red housing with a mesh filter inside. and the problem went away. there was a time when i had a faulty fuel filter as well. the filter was allowing air to bleed into the fuel line. the beauty of transparent fuel lines and transparent fuel filters is that you can see if there is air in the line, from the tank to the carb.
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Post by captincvmn on Apr 18, 2023 15:12:51 GMT -5
I had some transparent fuel hose on there, I always had an air bubble between the carburetor and the filter. I would get that to go away and then it would return. Since then I switch to 3/16 black rubber line, but the problem hasn’t changed. I’m also running a manual petcock
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Post by oldgeek on Apr 18, 2023 17:11:49 GMT -5
Curious, are you back to the pod or still on the air box?
And this is probably a dumb question, but are the 2 air vents on the carb that point down blocked or anything?
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Post by captincvmn on Apr 19, 2023 7:15:19 GMT -5
Air vents are open, I played with floats yesterday, attempted adjusting so fuel level is even with top of bowl at shutoff. I haven’t run it since then other than start it since it was 9:30pm. Testing this evening.
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Post by captincvmn on Apr 19, 2023 7:16:48 GMT -5
Drinking straw and a cup of water  |
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Post by captincvmn on Apr 19, 2023 20:58:06 GMT -5
Phone in jacket pocket. Takes off nicely but has weird stumble miss at sustained high Rpm.
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Post by captincvmn on Apr 26, 2023 19:28:07 GMT -5
Moved my needle one clip richer, third down from top. Very four strokie at anything under 30mph, top end still has miss. From 7/8-WOT it’s down on umph. Feels flat, has more go at 3/4 throttle. It’s rainy.
Tomorrow I’ll drop needle down and go to first clip from top and see how that is.
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