Author Topic: R50X revvs by its self  (Read 362 times)

robswede88

  • Guest
R50X revvs by its self
« on: April 28, 2017, 12:52:40 PM »
Hello
Just bought me an R50X, it starts really easily but after a minute on idle it starts to revving by itself. 6-7000 rpm. I have bought a new throttle cable and throttle handle but the problem is still there. I also cleaned the carburator with petrol but nothing seems to help.

I dont know if the carb is stock, its marked HUAGUANG TECHNOLOGY OF JAPAN.

harry

  • Administrator
  • Hero Member
  • *****
  • Posts: 829
  • Personal scooter consultant to the rich & famous
    • Whidbey Island Moped
Re: R50X revvs by its self
« Reply #1 on: April 30, 2017, 08:42:20 AM »
auto choke needs to be tested .
search the forum for "auto choke"  you will find test procedure i posted

 oilyhans
i own a scooter shop  with rentals ,sales& racing parts.
i also appraise scooters for KBB.

2003 Vino classic stage 0.75
de-reged stock variator w/8g sliding weights.
1.5k rpm  springs
42mph
2005 veniceLX ~70cc~upjet~1.5k rpm springs & 7gr sliders
46mph
KeyWest de restricted~8gr slide

robswede88

  • Guest
Re: R50X revvs by its self
« Reply #2 on: May 01, 2017, 11:58:17 AM »
It did not help. Also tried to disconnect the e-choke plug but same result. I think i will buy a new genuine carb. Seems like it should be partno. 424026A.

harry

  • Administrator
  • Hero Member
  • *****
  • Posts: 829
  • Personal scooter consultant to the rich & famous
    • Whidbey Island Moped
Re: R50X revvs by its self
« Reply #3 on: May 02, 2017, 07:28:00 AM »
 so after 5 min the choke plunger was in its no choke position ?

most people expect the choke to operate right now  like a solenoid
but it doesn't . it takes quite a while for the thermal wax to  heat up.

to really clean a carb right you need to use a dip cleaner  not a spray. and compressed air .

 oilyhans
« Last Edit: May 02, 2017, 07:30:02 AM by harry »
i own a scooter shop  with rentals ,sales& racing parts.
i also appraise scooters for KBB.

2003 Vino classic stage 0.75
de-reged stock variator w/8g sliding weights.
1.5k rpm  springs
42mph
2005 veniceLX ~70cc~upjet~1.5k rpm springs & 7gr sliders
46mph
KeyWest de restricted~8gr slide

robswede88

  • Guest
Re: R50X revvs by its self
« Reply #4 on: May 02, 2017, 10:24:49 AM »
Yes that is correct.

Yes i put the carb in a bath of petrol for two days. Then i used compressed air.

I dont really trust this china carb so i have orderd a new genuine mikuni carb. I will prob get it in two weeks. I will write if i have any success.