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Post by endru on Jan 26, 2013 20:58:54 GMT -5
I commute about 5 miles to work every day. Since it's gotten really cold, I've had a difficult time keeping my scoot running well. If it's not warmed up really well, it bogs out when I try to accelerate from a standstill. It hasn't been idling well either. Getting it started is not a problem, just getting going once it's been started. If I give it full throttle it will usually die. Giving it just a tiny bit of throttle doesn't kill it but it won't rev. My best bet usually is to give the throttle some quick twists until it revs like normal. Once it's warmed up, it idles and revs just fine even from a stop.
Before it turned cold I had the same problem, which I fixed by adjusting the a/f screw. So I've readjusted the a/f screw on the carb again a few times, and the only setting I've found that really works is something crazy: 8 full turns out. This is not normal, right? It used to be at 2.5 turns out, but the idle speed kept getting better the further out I turned it. It seemed to help when I took it for a spin tonight. Started it up and after 4 minutes warming up I took it out. It wasn't revving perfectly but there was much improvement.
Turning out the a/f screw is richening the mixture, correct? I know I don't want to be running leaner with the colder temperatures. My biggest worry was that the screw would fall out, so I plugged the screw port with a little wad of duct tape and taped that in place.
Please let me know if I'm going about this wrong.
BTW I'm running a #80 main, #32 idle, Uni-style intake and stock exhaust.
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Post by tortoise on Jan 26, 2013 21:08:19 GMT -5
Since it's gotten really cold, I've had a difficult time keeping my scoot running well. If it's not warmed up really well, it bogs out when I try to accelerate from a standstill. It hasn't been idling well either. Another option. |
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Post by endru on Jan 26, 2013 21:52:27 GMT -5
Thank you tortoise. I've been assuming it was a mixture screw issue, but come to think of it I have noticed that my enricher engages too quickly (usually within 1 minute of startup). This would definitely be causing me to lean out prematurely.
I'll try that out beginning of next week and post an update. Thanks again!
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Post by yosemite on Jan 26, 2013 22:06:33 GMT -5
To have the Fuel Ratio Screw not have to be turned out so much get a #35 Pilot Jet.
Sam
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Post by endru on Jan 26, 2013 22:14:24 GMT -5
To have the Fuel Ratio Screw not have to be turned out so much get a #35 Pilot Jet. Sam I thought about that, but the scoot idles just fine after it's fully warmed up, even at 2.5 turns out. Putting a toggle switch on the enricher gives me a similar effect as upjetting the idle, but essentially lets me determine when to "go back down to a #32." |
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Post by rune75 on Jan 27, 2013 16:54:07 GMT -5
You need a bigger main Jet.
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Post by rae4180 on Jan 27, 2013 20:38:34 GMT -5
in the cold weather if everything is stell stock go with a 82 main jet. But theres nothing wrong with leting the scoot worm up. besides its better for the scoot. also cover the cooling fan up half way to stop some of the cold geting in.
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Post by yosemite on Jan 27, 2013 20:39:39 GMT -5
O-Kie Dokey
Sam
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Post by endru on Jan 27, 2013 20:42:28 GMT -5
You need a bigger main Jet. The plug chop indicates otherwise. Also, the symptoms are mainly limited to the engine at idle and initial throttling. Once I get it revving and the main jet kicks in, there's no bogging whatsoever. Plus, wouldn't an #85 main jet on a stock 50cc with just a uni filter be a little rich? I do have an #85 lying around, I guess it wouldn't hurt to give it a try if the enricher switch doesn't solve the problem. |
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Post by yosemite on Jan 28, 2013 0:07:09 GMT -5
It is NOT your main jet whatsoever, your problem is starting and idling and bogging when throttle is given that is your PILOT JET and WHEN COLD the ENRICHER. Your problem title says it all "a/f screw too far out?" What that tells you right off the bat is your Pilot Jet is either to small that you have to turn out the Fuel Ratio screw way out and or the ENRICHER is either not working the PLUNGER when COLD IS EXTENDED and not retracted or it is EXTENDING to quickly shutting off the extra fuel before the motor warms up a little. The other problem could be is that tje ENRICHER inlets and outlets are plugged and need to be cleaned out.
Did you check your enricher and see if the Plunger is EXTENDED or RETRACTED when COLD?
Very simple to test the ENRICHER take it off before you start the scoot and lay it on its side and PUT your thumb over the hole and hold it there start the scoot and let it idle for about 5 minutes meanwhile while it is idling watch the ENRICHER and see it start to extend out it should extend out fully about 1/4 of an inch in about 3-5 minutes.
Sam
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Post by rune75 on Jan 28, 2013 5:16:44 GMT -5
You need a bigger main Jet. The plug chop indicates otherwise. Also, the symptoms are mainly limited to the engine at idle and initial throttling. Once I get it revving and the main jet kicks in, there's no bogging whatsoever. Plus, wouldn't an #85 main jet on a stock 50cc with just a uni filter be a little rich? I do have an #85 lying around, I guess it wouldn't hurt to give it a try if the enricher switch doesn't solve the problem. Go for the 85Jet. I had a similar problem whit my scooter when it got cold outside. I upJeted, and it now runs just fine. |
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Post by endru on Jan 31, 2013 22:00:14 GMT -5
So I did some tinkering and there have been some interesting developments. First, I tested the enricher and it was extending just fine. I then bought the switch and have installed it. It worked as planned. The rpms stayed high until a few minutes after I threw the switch. The extra time warming up in "enriched mode" kept me from bogging out at my first stop. So as far as I'm concerned, problem solved. In addition to figuring out an aesthetic and functional place for mounting the switch, I also need help with the functionality of the switch. It's a 120volt AC illuminated switch. I don't know a ton about electronics, much less AC electronics, so the switch is a little hard for me to understand. I chose at random one of the two wires going to the enricher, and spliced the switch inline with that. There is also a ground pole on the switch. The switch only illuminates if the ground is connected AND if I have the other two terminals oriented a certain direction in relation to the original wire, which is to say that if I reverse the wires on the switch, then the switch will function but not illuminate at all. I just think that's odd, I guess maybe I'm just used to simple DC switches. The only actual issue I have is that the switch illuminates in the off position instead of the on position. Is this because I chose the wrong wire from the enricher? Or is that just an oddity of the switch itself? I guess I could just try the other enricher wire to find out, but I'd rather not snip wires more than necessary. |
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Post by super9 on Feb 11, 2013 7:24:08 GMT -5
You need a bigger main Jet. i think you will find its nothing to do with the main jet...its the idle/pilot jet that needs sorting |
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Post by endru on Feb 11, 2013 20:09:45 GMT -5
So I rewired the switch - I switched which enricher wire it was connected to and it works just like it's supposed to now. I ended up mounting the switch on the handlebars, which meant that there was a lot more labor involved getting a wire from the enricher up into the handlebars, but it's exactly where I want it. In the photo, the switch is off, which means it will run enriched until I turn it on (or rather a minute or so after I turn it on). The main thing to note is that the performance is now EXACTLY how it should be. I've had it installed for over a week now, including some very cold days. It does not bog out ever, and I can just turn on the switch when I feel it's warmed up enough. I'm not installing a bigger pilot jet. It really was just a matter of the enricher engaging too early and cutting off the extra fuel supply before it was ready. Having the switch lets me control that variable. Doing some testing, I found that the needle extends after less than one minute, which is way too quickly, especially on colder days. It's rare that a scooter like this would need a bigger pilot jet, and if I did, I would be idling rich as soon as it's warmed up. Big shout out to tortoise for the idea ;D Attachments:
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Post by edfr on Feb 11, 2013 20:24:42 GMT -5
FANTASTIC ENDRU!! Great job and now you can control the Enricher since it appears it was extending to fast and causeing it to run LEAN when cold.
Lefty
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