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Joined: Aug 28, 2015 15:02:31 GMT -5
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Post by scoottim on Sept 2, 2015 13:30:53 GMT -5
I recently purchased a 49cc, Chinese, 2 stroke scooter at a garage sale for $50.00!! Much to my surprise I was able to get it running with new oil, gas, and a spark plug. However, the top end was 20 mph and it would bog down and lurch. I have replaced the fuel filter, fuel tap and cleaned out the carb jets. I have had trouble finding an identical fuel tap, the original had 4 lines (fuel from tank, fuel to carb, vaccuum from carb, and vacuum to gas tank). I was only able to find a similar fuel tap that had 3 lines, its missing the vacuum line to the gas tank. Can anyone advise me on the significance of the missing vacuum line to the tank?? Also, the scooter will run really well for the first 5-10 minutes. I can run smoothly at 25-27 MPH. After 10 minutes, she starts to bog down and runs really sluggish (top end drops to 20 mph) including a backfire, here and there. Any suggestions would be greatly appreciated.
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Post by crawford on Sept 2, 2015 14:52:59 GMT -5
first leave fuel cap lose and try see if any in improvement,if not wondering if carb varnished up sitting for a while check it and clean it if needed.,also are you putting high octane gas in it. Check valve lash someone here will know what it should be good luck with your project .
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Post by JoeyBee on Sept 2, 2015 16:07:08 GMT -5
For a 50cc, intake should be set at .003inch intake and .004inch exhaust.
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Post by hillbillybob on Sept 3, 2015 7:11:46 GMT -5
I agree with the venting of the fuel tank, as a good place to start......no valves to adjust on his two stroke, so check, and make sure there is an operating tank vent.
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New Rider
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Post by scoottim on Sept 3, 2015 15:13:30 GMT -5
Thanks for the great advice! I can't wait to try venting the gas tank. I wasn't sure what to do with the existing line when I replaced the fuel tap so I plugged it with a golf tee. It sounds like that may be the issue. I will be working on my scoot over the long weekend so I will report back with my findings.
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Post by cyborg on Sept 3, 2015 21:14:23 GMT -5
Fuel tank venting issue
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Post by vintagepgogod123 on Mar 10, 2016 22:48:09 GMT -5
Ch check the carb may have a stuck needle on the enrichhning system/choke/bypass starter smoke is apearrent its too rich a 2t Is beautiful. Air screw can also need adjusting.
I run on the winter splooge time at a 0.24-28 gap in the winter on NGK with .40 stock gap in the summer the gap closes and the splooge vanishes next to nothing in summer which allows smaller gap.
Compression is as high a 210psi to 180psi in summer weather. Splooge can't form due to its combustion from external heat from the world.
Brown coffee spark plug.
How you tune it is what matters.
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