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Post by somebody on May 30, 2010 20:36:26 GMT -6
My scoot starts "skipping" firing (sputtering) starting around 45. So far, checked connections, spark plug looks good, it only puts out 12.8 volts at 5k-rpm. The breather tube on the valve cover was off - reattached. Valves adjusted when this started happening. Gas filter changed.
I'm wanting to do a 300m ride in a couple of weeks and want to be in good shape.
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Post by Alleyoop on May 30, 2010 20:49:29 GMT -6
Well the first thing is, your charging system is only putting out 12.8 volts at high rpms. It should be well over 13 nearing 14volts. Well your running Lean if its backfiring, check you gas filter it may be really dirty and not allowing enough fuel to flow. Also your main jet could be clogged since the Main Jet Comes on around that speed. So I would take the Carb off and Clean it real good and blow air through every little hole in there.
Alleyoop
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Post by somebody on May 31, 2010 13:04:44 GMT -6
The ground is good - frame still shiny where I scraped all the paint off. Bolt to ground was very tight. The battery (2 months old) reads 12.38 when it's cold. Idle = 12.25 volts, 3,000 rpm = 12.48, 5k= 12.58. I'm kinda under krunch since I want to ride about 350 miles in a couple of weeks. I've gone on and ordered a new rectifier to see if that's it. If it's not, I have a spare on hand  . I've also ordered Kidandmes' high performance CDI/Coil assembly. It's a little steep, but sounds like it does a nice job. I'm also running the NKG iridium spark plug - I think I forgot to mention that. Also, even though it's missing, it will still accelerate to 60+ albeit a little slowly. P.S. Just took her out for a spin on a 93 degree day. Got on a highway - no problem held 70 + for a good 10 minutes, varied speed no problem. Stopped to get a soda - start back up and around 40, it started sputtering, let off the gas, then opened it up and it sputtered. Sputtered it up to 70 and it seemed to hold rather well. Hit town and it lightly sputtered at lower speeds as well. Other observations.... 70mph = 11.95volts (about 40mph=12.5v - rectifier problem? I'm going to pull the other "extras" which I've added as see if that does anything. |
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Post by Cruiser on May 31, 2010 17:48:50 GMT -6
Before you do any charging system trouble shooting, bench charge the battery and then check the voltage. On a new battery like yours, 12.8 to 13 volts should be the result. If the battery charger cannot charge your battery fully, then the battery is defective. The charging system voltage of the scoot will give a low reading if the battery is demanding too much current to charge it.
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Certified Clinician
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Of all the things I've lost, I miss my mind the most.
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Post by somebody on May 31, 2010 22:17:29 GMT -6
When I got home around 4pm, I stuck it on the charger. Just checked it at 11pm and it was reading 12.97 volts.
I hope to get my Avons mounted this week and will see what happens with the rest of this. If I can get this worked out, June 13, I'll be headed our on a 160 mile 1 way trip, be there for a week then home. I'm going to help build a straw bale house. Who'd a thunk?
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Post by ootscoot on Jun 1, 2010 7:57:38 GMT -6
We had a 250 in the other day with similar symptoms - sputtering at higher speeds, missing,but running...turns out the flywheel had loosened a bit - worn keyway, and the timing was off just a tad as a result
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Certified Clinician
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Of all the things I've lost, I miss my mind the most.
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Joined: May 5, 2010 22:25:20 GMT -6
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Post by somebody on Jun 1, 2010 10:08:42 GMT -6
shhhhhh - don't say that. That would be a bummer.
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Certified Clinician
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Of all the things I've lost, I miss my mind the most.
Posts: 53
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Joined: May 5, 2010 22:25:20 GMT -6
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Post by somebody on Jun 4, 2010 23:55:53 GMT -6
Stuck in a new rectifier and Kidnmes' xtreme performance cdi/coil - Still no joy. 5,000rpm = about 12.45 volts. Give or take a few tenths because the voltmeter on my scoot is a Chinese voltmeter I got off e-bay for 5 bucks. However, when I check it with my Radio Shack DVM (another cheap Chinese voltmeter) and the voltmeter on my scoot are with 4 or 5 hundreths of each other when I have them on the charger. I wanna cry. Stator? I can only imagine how hard that thing is going to be to get to. I can say that it's not spitting and missin' anymore.
However, with the new Avons I can ride off into the sunset until the battery goes flat.
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Post by Cruiser on Jun 5, 2010 23:10:59 GMT -6
I feel your pain, somebody.  It looks like you have done everything to lighten the electrical load on your scoot's system. I've done the same with mine and I'm still getting marginal results. Your charging measurements are with the cooling fan off, I assume. This means it drops quite a bit when the fan comes on. Since you have a DVM and know how to use it, you should do this charging system diagnosis. www.thegsresources.com/garage/gs_statorfault.htm |
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..BAD TO THE BONE..
. I've also ordered Kidandmes' high performance CDI/Coil assembly. It's a little steep, but sounds like it does a nice job.
It looks like you have done everything to lighten the electrical load on your scoot's system. I've done the same with mine and I'm still getting marginal results. Your charging measurements are with the cooling fan off, I assume. This means it drops quite a bit when the fan comes on. Since you have a DVM and know how to use it, you should do this charging system diagnosis.