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Old 12-21-2012, 06:56 PM
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Default Sparkplug run afoul

My scoot finally hit 55+ since my belt change and as soon as it broke 55 it acted like it stalled but sparked back up as I slowed to 49. It runs great untill about 53 then sputters but maintains speed +/- 3mph. I thot it might be water again but I've rode hundreds of miles and many tanks since it started sputtering. It only happends above 50mph (but not every time) and never fully dies. Can this be my spark plug? I'm still running the plug that came with the bike 10,000 miles ago. What plug do you all recommend, is the ngk iridium any better than stock on a stock bike?
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2005 Yamaha Vino 125
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2002 TNG Venice 50cc
2001 Qingqi 50cc

Last edited by Trojan69Reggae; 12-21-2012 at 07:00 PM.
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Old 12-22-2012, 07:23 AM
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I would start with the plug and add some seafoam to the gas to make sure its nice and clean inside. With the amount of riding you do I have a hard time thinking it is a fuel issue but it never hurts to check. Do you have a fuel filter on your scoot? When was the last time you cleaned the engine air filter and air filter for the transmission? As far as the plug is concerned, in all my racing days, I tried all those fancy nancy plugs and I could never tell any difference between a clean stock plug and any of those gold tipped, iridium, platium, Y-shaped electrode plugs or any other gimmick plug. After a lot of experimentation I thought all those gimmick plugs were designed to part me from extra money.
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Old 12-22-2012, 08:31 AM
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Brand new air filter less than 1000 miles ago, cleaned the cvt filter with the new belt install. I found out that there is a fuel filter in the fuel line just under the tank, it's a small pen like filter in the line. It can do with a replace and I'll just put the same kind from autozone that I stuck on my 50cc last year. Autozone has a spark plug for my bike in stock (ngk cr7e), I'll grab both today and jam then in there.
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Old 12-22-2012, 10:42 AM
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Is it possible the engine is starving for fuel at that speed?
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Old 12-22-2012, 03:44 PM
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It is possible its starving but he rides all the time so his carb should be clean and he does have a fuel filter. If there is trash in his system then the fuel filter should be the restriction. Once he replaces the fuel filter and puts in a new plug he should be good to go. Trojan runs wide open most of the time from what I gathered reading his posts. His scoot doesn't sit long enough to collect gummy deposits.
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2005 Vespa 200GT
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Old 12-26-2012, 11:17 AM
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Does the CDI have a built-in REV limiter?
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Old 12-26-2012, 12:32 PM
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Before my belt change I would hit 55/60 every morning with no problems and 65 if the scooter gods were smiling on me, so I don't think the rev's are limited. It might be starving for fuel, but this doesn't happen every time and never stalls, just sputters.

I got the plug but I can't get the old one removed, I have no room to ratchet. I'm using a stubby driver but I guess it's not stubby enough. None of the stores near by have a u-joint in stock but I'm about to give it another whack with the underseat tool. When I first got in there I noticed my sparkplug wire was just barely hanging onto the plug. I stuck it on there nice and tight and haven't had a problem since, though I haven't ridden far this week. Regardless, I am due for a new plug.
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Old 01-01-2013, 11:03 AM
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FIXED!

Yesterday on my ride to work it was a little hard starting but with a few kicks I got it going. Then the bike starts sputtering at 45, never done that before, then at 40 then 30. I only had to ride 11 miles and as soon as I pulled into my boss's driveway the scoot dies. It would not start back up. I get off work and it still wont start, so I figure the carb is gummed up again. I take it home and pick up some STP injector cleaner and a can of carb spray. First thing this morning I start dismantling the scoot. I get the seat box and all the plastics off and right before I pull the carb I stop and think 'I bet I have enough room to get that spark plug out'. As I lean in to take off the plug wire I notice that the plug wire isn't even attached, it's just barely touching the electrode on the plug (just enough to complete the circut I guess cuz it was cranking). I jam it back on there and the bike fires right up no problems, I change the plug, bolt and screw everything back together and take it on a 7 mile ride. No problems at all, I accelerated all the way up to 55 smoothly and maintained it.

So the culprit: Loose plug wire.
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2001 Qingqi 50cc
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Old 01-05-2013, 03:12 PM
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Thanks for the update! I'll remember to look there first when my scoot starts acting up...
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Old 01-05-2013, 05:43 PM
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Ok, so this has become more than annoying. If caught the plug trying to shake loose on a few pre ride checks and tonight it slipped off at 55 in the rain, then two more times berore I got home. I've been looking on ebay and there are 3, all different years and different designs. I haven't cross refferenced the parts yet, but I will tmrw as I'm shopping for a newish plug wire.
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2001 Qingqi 50cc
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Old 01-06-2013, 07:35 AM
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All the years of Vino 125's share the same part number for the Spark Plug Cap Assembly so I don't see why the 3 available on ebay are so different in appearance. Also they are roughly $6 new from the various OEM parts dealers yet the used ones on ebay are $13. I don't get that either, however the last few times I tried to order from the online OEM dealers they had nothing in stock and after weeks of no updates and no shipping I had to request my money back.

I've read on the other forums that this problem is almost as common as the exhaust bolt and many owners have fixed it with a ziptie, it looks like I'll be doing the same.
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2001 Qingqi 50cc
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Old 01-06-2013, 04:59 PM
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Ziptie did not work, it still slipped off. The whole thing just falls right off there is no grip and I have a new plug so I know it's not the treads. I saw an aftermarket plug cap assembly on ebay I'm gonna look into.
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2001 Qingqi 50cc
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Old 01-07-2013, 09:16 PM
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You should be able to get a new spark plug cap from your local automotive dealer like Napa or Pep Boys. My problem was that the cap fit on too tight & I broke the cap pulling it off the plug one time.
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Old 01-11-2013, 06:53 AM
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I got the ziptie to work by poking two holes in the plastic cover, now that I have the wire securely on the plug and a new plug I have been hitting 60 mph when the wind is right. The aftermarket High Tension wire they got on ebay says it fits both the 50cc and 125cc vino's but in the Yamaha parts catalog they use different parts. I've read the Frankenscoot had one made my NYC but I cannot find it anywhere online. I'm gonna wait for my tax return before I get any parts for my scoot so I'm gonna keep researching.
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2001 Qingqi 50cc
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Old 01-12-2013, 04:27 PM
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back in the early 1970's when I first started riding dirt bikes we had similar problems. We would use silicon RTV on the plug cap to seal the water out and hold the plug cap on. We also used automotive parts to repair things like that. Over the years the parts got better and I never had those problems again. Seems they're using inferior parts to make the scoots cheaper and the problem has returned.
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2005 Vespa 200GT
2008 Hayabusa (need for speed)
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