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Post by johnlaw on Jun 16, 2019 20:08:47 GMT -5
I recently purchased a chinese brand 2 stroke scooter for my son to use at college. It is a 2009 Qianjiang Eurostrata RX8. It has almost 5000 miles on it. It runs really well for 3-5 miles. At that point it loses almost all power. Sometimes it will actually stop running but will usually restart. At this point it will only run between 1-5 mph. My son and I have replaced the fuel filter, battery and spark plug. A friend who is very mechanical also cleaned the carburetor for me. Any ideas would be greatly appreciated. After sitting for several hours it will run normal again.
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Post by 190mech on Jun 17, 2019 3:46:10 GMT -5
 Could be a lot of things,,I'd do a compression test to check top end condition,a fuel flow issue like a low flowing petcock,cracked vacuum hose,tank cruddy,etc,,exhaust port carbon clogged,or muffler..
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Post by jackrides on Jun 17, 2019 12:53:30 GMT -5
Check for blocked fuel tank vent.
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mattyslimz
Scoot Enthusiast
Posts: 222
Location: Northern Virginia
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Post by mattyslimz on Jun 18, 2019 17:30:55 GMT -5
johnlaw, have you tested your coil underneath the running board? It is on the right hand side. Also do you have a clear fuel filter to see if the carb is getting enough fuel supplied by the vacuum/petcock? If the scoot sat for a period of time it is possible the fuel petcock has a bad diaphragm/blocked. I recommend a new one or replace with a manual cock.
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Post by chehystpewpur on Jul 16, 2019 13:37:45 GMT -5
ive had a bad exhaust cause one to not run after a little bit and have to cool to restart. but chipped reeds will also cause them to run funny and most cases not at all after they get bad enough.
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Post by GrumpyUnk on Jul 17, 2019 13:54:26 GMT -5
Could be a gathering at the fuel tank outlet. "Stuff" inside the tank will dither around, and when the fuel is flowing start to gather at the fuel outlet. Most have a perforated/screened outlet tube to prevent junk from leaving, but it can clog if there's enough stuff. Maybe take a gander at the outlet, or at least check the level in the filter(you do have a see-through filter, right) when it starts to fail.
If not that, check the fuel level as quickly as possible after it putts to a stop. Loosen the drain screw/valve on the float bowl and see if fuel runs out(a float bowl FULL at least). If no fuel, you have a flow problem.
You could also have crankshaft seals that give up the ghost, or a leak to the crankcase that comes/goes with temperature change. Check for leakage as a leaky crankcase will not draw fuel:air mix in from the carb, but will draw from atmosphere, slowly going to a too-lean mix to run properly.
Check also that the clutch end of the CVT is allowing the belt to ride out to the rim of the clutch pulley area. Or close. If it is not there when at idle or slow, or at rest, it is either the clutch or a goofed variator that are not being succesful at re-positioning the belt. You DID put the variator back together correctly, didn't you?
tom
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