Brand New RFZ 250 wont keep running

Enkrypter_DJ · 05-29-2023, 03:21 AM

I have a brand new RFZ 250cc. It ran good for about 8 minutes we used it around the yard then it bogged and stalled. It starts and idles fine but as soon as i touch the throttle it stalls.

I checked the air filter and its not clogged. I even removed it and the symptom remains the same.
I also removed the carb a few times to verify the jets, choke plunger, passage ways and float. I dont see anything wrong.

Any suggestions?

herbie · 05-29-2023, 07:45 AM

Bogging is a lean condition, do you have good fuel flow to the carb? Is your gas line from the petcock a steady downward flow to the carb with no uphill travel? Pull the fuel line off at the carb and turn the petcock to on position and check flow, turn to reserve and check flow. If you have good flow then my next step would be to pull the float needle valve and clean that. Good luck with it

culcune · 05-30-2023, 01:17 PM

Did you adjust the valve lash? Sometimes, Chinese thumper engines come with very tight valves and need adjustments from new.

05-29-2023, 03:21 AM	#1
Enkrypter_DJ Join Date: May 2023 Posts: 1	Brand New RFZ 250 wont keep running I have a brand new RFZ 250cc. It ran good for about 8 minutes we used it around the yard then it bogged and stalled. It starts and idles fine but as soon as i touch the throttle it stalls. I checked the air filter and its not clogged. I even removed it and the symptom remains the same. I also removed the carb a few times to verify the jets, choke plunger, passage ways and float. I dont see anything wrong. Any suggestions?
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05-29-2023, 07:45 AM	#2
herbie Join Date: May 2019 Location: Illinois Posts: 867	Bogging is a lean condition, do you have good fuel flow to the carb? Is your gas line from the petcock a steady downward flow to the carb with no uphill travel? Pull the fuel line off at the carb and turn the petcock to on position and check flow, turn to reserve and check flow. If you have good flow then my next step would be to pull the float needle valve and clean that. Good luck with it __________________ 2022 Venom KPR 200 Red- the fastest color 16t and 46t sprockets, NGK Iridium CPR8EAIX-9, aftermarket full exhaust system. Top speed 81GPS 2023 Venom SS3 KP mini 150– Nibbi carb, Nibbi air filter, aftermarket muffler, decat 2022 Venom Ghost chopper 250 1997 Honda GL1500 Goldwing 1978 Kawasaki KL250 https://youtube.com/@herbiesgarage681
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05-30-2023, 01:17 PM	#3
culcune Join Date: May 2006 Location: Yuma, Arizona Posts: 9,056	Did you adjust the valve lash? Sometimes, Chinese thumper engines come with very tight valves and need adjustments from new. __________________ "They say that life's a carousel, spinning fast you got to ride it well..." TGB Delivery Scooter 150 TMEC 200 Enduro--carcass is sadly rotting in the backyard
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