Question about Motovox MVS10 43cc 2 Hp 2-Stroke Gas-Powered Stand-Up Scooter

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43cc motovox will start and run ok for a couple of mins. then loses power and dies . Checked compression hot and cold OK , new carb and spark plug didn't help.

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When it stops immediately check for spark if no spark when warm but spark when cold suspect ignition coil or related component

Posted on Jan 22, 2015

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Posted on Jan 02, 2017

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IHAVE A CUB CADET 173CCOHV SELF PROPELED WON'T START NEW PLUG GAS TO THE CARB OK OK AIR FILTER OK CLEANED CARB STILL WON'T START.


got to have fuel, spark, air and compression. your missing one. be sure plug is good. give it a shot of carburetor cleaner. if it starts and dies it is fuel. check compression. take off valve cover and be sure valves are working as they should and gaped correctly.

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often the is a fuel filter in the tank at the end of the fuel line, if it has deteriorted then yes it could stop it from starting due to a clog in the carb. If ou have good spark then sprat a few puffs of starter fluid into air intake or on the air cleaner ( which should be clean ) . if it starts for a second or two then it's most likely your carb.

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Have you checked spark plugs? I always check the "BIG" three when diagnosing any engine. Compression, spark, and fuel. I recommend buying a compression tester and a spark tester. Check both of those, if ok then make sure your still getting fuel to the carb. If so, try a shot of starting fluid through the aircleaner, if it starts on starting fluid then dies, you have a dirty carb. I would first of all replace plugs and give this unit a tune up. Good luck and happy wrenching!

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ITs hard to diagnose these things over the internet, it could be so many things.
Is this a gradual loss of power? If so; Im sorry to say; that it sounds like its losing compression as it warms up. It is not cost effective to repair the unit.

If the loss of power is more sudden it could be a failing ignition module. Ive even seen spark plugs that quit working when they get hot.

To test this you will need a proper spark tester, laying the spark plug against the head will not provide an accurate assesment, and a can of carb cleaner. Run the unit with the air box cover and filter removed till it fails and immediately give a shot of carb cleaner in the carb and restart. If it starts right up it could be fuel related. IF it doesnt start right up then quickly test for spark. If no spark then its likely the ignition module. If it wont run on the extra fuel and it has spark then it has probably lost compression.

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1 Answer

2007 Gilera DNA 50 loses power when hot


Hi, Dratmanl9 and the usual suspects are:
1. Faulty ignition coil.
2. Faulty spark plug cables.
3. Faulty temperature sensor.
4. Faulty starter motor.
5. Valves adjusted too tight.
6. Spark plug gap too wide.
7. Fuel has vapor lock.
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.
GILERA DNA 50CC BOGGING DOWN SOMETIMES WHEN RIDING HELP
The MotorBike Forum
Gilera DNA 50 Workshop Manual
Gilera DNA 50 2002 Parts
http://absolutelyscooterparts.net/pdf/CGEN_dawg_scooter_manual.pdf

Btw, I’m available to help over the phone in case u need at https://www.6ya.com/expert/gregg_c0ec1df182c7330e

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Stihl bg 55 blower runs good for 5 min. then loses power


1) carburetor gaskets/diaphragms may need to be replaced

2) ignition coil may be breaking down when hot

3) check compression when cold, then after it stops, when hot

4) could have a vacuum/pressure leak

*I would investigate carb first

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Remove muffler and check for carbon blockage.
If that is ok check crankshaft seals for leakage.

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