Question about 2008 Sym Mio 50

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My sym mio 50 keeps cutting out there is fuel getting through to a new carb if I run it off a different fuel sauce it runs fine help please

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  • Sym Master
  • 991 Answers

Fuel tank breather could be blocked or the filter on the fuel tap.

Posted on Apr 21, 2015

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1 Answer

My sym 50 keeps back firering and cutting out when it's hot what's wrong with it


Hi, Lorna and the usual suspects are:
1. Severely discharged or a damaged battery must have 12.5 volts or more and be able to pass a proper "LOAD" test if necessary, you may have a preliminary reading of 12.5 volts or more but little or zero amperage the battery is faulty and must be replaced, AGM batteries fail in this scenario more so than lead acid batteries.
2. Faulty alternator/generator and or voltage regulator.
3. Loose or corroded battery terminals and or cables especially the "NEGATIVE" cable, look for loose, corroded, or broken connectors inside the cable harness at "BOTH" ends.
4. Faulty main circuit breaker or ignition switch, check for loose connections and continuity.
5. Faulty system and or ignition relay, check for continuity.
6. Faulty ignition coil, ignition/electronic module.
7. Faulty CKP, CPS, CMP, MAP, TPS, or BAS sensor, corroded, loose or broken wire connector pins/sockets.
8. Throttle cables and or idle speed improperly adjusted hot idle speed should be 950 RPM to 1000 RPM.
9. Faulty neutral, side stand or clutch lever safety switch.
10. Fuel tank empty
11. Fuel tank contaminated with ethanol sludge.
12. Water or dirt in the fuel system, or clogged filter.
13. Restricted, blocked or kinked fuel line.
14. Faulty fuel pump.
15. Faulty pressure regulator.
16. Faulty or clogged fuel injectors.
17. Lean angle switch is faulty or needs adjustment.
For more information about your issue and valuable "FREE" downloads that you need for viewing or printing please click on the blue links below. Good luck and have a wonderful day.
Major missing backfiring cutting out when hot
starts runs backfires dies CDI ruled out
Sym Jet 50 Service Manual
Sym JET EURO EU2 50 cc 2004 Parts
Sym JET 50 series Owner Manual

Sep 09, 2017 | Sym Motorcycles

1 Answer

Sym mio 50 is starting then cutting out for about ten minutes then when warm it runs fine I have replaced the carb this has not made any difference please help


Definetly an air leak, I believe what is happening is where the inlet manifold joins the cylinder it has a poor joint which when cold is contracted and when engine heats up the joint expands with the heat,sealing the leak, ie causing the fuel/air mixture to become rich enough for scoot to run.

Apr 21, 2015 | 2010 Sym Mio 50

1 Answer

Sym jet euro I have cleaned the carb put back together it starts at fast idle then settles down then stalls take the plug out and is wet with fuel so I am confused can some one please help me


take carb off again and check float height it should be 8.8 +- 1mm then screw air mixture screwin untill it just seat the unscrew 1 1/4 to 1 1/2 turns once running set idle to 2000 +- 100 for the 50 and 2100 +- 100 for the 100 model

Jul 22, 2014 | 2004 Sym Husky 125

1 Answer

How to make a mio 50 go faster


You need to check its restrictions ie carb stop exhaust restriction etc, then you can go for a sport variator /roller kit, available on line.

May 15, 2014 | 2010 Sym Mio 50

1 Answer

I purchased a SYM MIO 50 new on July 3,2010 for my wife. It's a 2009 model and she has only driven it approximately 50 miles since she received it. We stored it in our garage last winter and yesterday...


Normal warranty is only 90 days. Better chcek on what yours actually is and what it covers. The problem is going to be either water in the carb float bowl or varnish build up in the carb from evaporating gas over the winter. The carb needs to be cleaned. Try just draining the carb float bowl using the drain screw on the lower part of the bowl. Most all bikes have a drain screw but if yours doesn't, just remove the bowl and clean the interior of the carb. Please rate my answer.
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May 29, 2011 | 2007 Sym Mio 50

1 Answer

My sym symply 50 was left 4 bout 6 wks over xmas cos wouldnt start. i have snce put new batter an spark plug on. it nowstarts 1st time an will run idle for ever but after riding for while it cuts out it...


sounds like dirt in the carb. If left for a while the petrol will go off and clog up the jets in the carb. I suggest replacing the fuel and cleaning out the carb.

Mar 01, 2011 | Sym Husky 125 Motorcycles

1 Answer

Hi i am having problems with my SYM jet 50 euro x, i have had a new battary about 1 month ago and i have had my carb cleaned but i still having some problems with the lights going dull and when i am riding...


Hi, Aaron the answer to all these questions is way above my pay grade for this situation, I would call or visit my local dealer or reputable shop's service/parts department and inquire about any possible quick fix, answers, or parts inquiry.
For more information about your issue and valuable "FREE" downloads that you will need for viewing or printing please click on the blue links below. Good luck and have a wonderful day.
SYM Jet Sport S50 Service Manual
Sym JET EURO EU2 50 cc 2004 Parts
http://absolutelyscooterparts.net/pdf/CGEN_dawg_scooter_manual.pdf
SYM Jet Sportx 50
Sym Jet Euro Wikipedia

Aug 20, 2017 | 2007 Sym Jet Euro X 50

1 Answer

Sym shark 50 cc won't start. Battery ok, but


have you checked the vacuum tap to see if its working simply remove the smaller diameter hose from the carb and the fuel line its self **** small one to create vacuum and fuel shold come from fuel line if not the tap could be just blocked or the diaprham could be damaged in the tap

Nov 30, 2009 | 2004 Sym Husky 125

3 Answers

I have sym jet 50 99 reg it just cut wont start


Is there a spark at the plug? if so its likely to be fuel related... is the plug getting wet? if so its likely to be air (or spark) related
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Aug 13, 2009 | 2006 Daelim History

1 Answer

My Sym Joyride 180 cuts out when I slow down


If this happens in cold weather or after a fast run it's carb icing. SYM do a replacement carb bowl to solve this or you can use a fuel additive SILKOLENE Pro FST. I use the additive as it also keeps the fule system clean and lasts well.

Jun 20, 2009 | 2004 Sym Husky 125

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