New rider help

Ridelikebrian · 05-23-2023, 08:52 PM

Hi, I’m a new rider and having mechanical issues with my enduro 250cc but don’t know what. I’ll start by saying it’ was brand new buying it , and I’d ride it about 20-30 miles on it 5 days a week. After a couple months in, I was coming off a stop sign and switching gears was fine until I put it in 4th, then suddenly the bike started bogging down and sputtering. It would then die shortly after. Sometime I can get it to turn back on but if it does it shuts back off or won’t have full power when giving it gas. It has moments where it runs fine for a bit but will not stay well and 100% all day. It’s fuel injected so no carb. Oil was at good level and spark plug still good. There is this thing that looks like a sensor that broke, not sure if that’s related to the problem, I attached pics. And I don’t know what kind of sensor it is. Any help is appreciated . Thanks in advance!

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Bill Hilly · 05-23-2023, 09:06 PM

That actually looks like the rear brake light switch, but you may have a wire shorted because of it.

Boatguy · 05-23-2023, 09:53 PM

I am going to go with Bill Hilly’s idea also.

My main power line on the bike chafed through at one time and it behaves exactly like you are describing. I think it’s an electrical problem.

They are not fun to find.

Ridelikebrian · 05-23-2023, 10:36 PM

I’ll check the wires, but last I checked that sensor isn’t connected to anything else. Also I want to add that sometimes while riding I’ll get the loud popping from the exhaust . So it isn’t a fuel issue?

Bill Hilly · 05-23-2023, 10:57 PM

Quote:

Originally Posted by Ridelikebrian

I’ll check the wires, but last I checked that sensor isn’t connected to anything else. Also I want to add that sometimes while riding I’ll get the loud popping from the exhaust . So it isn’t a fuel issue?

Not necessarily, it could be the short(if present) causing the ignition to mis fire, OR it could be causing issues with the fuel injection. I assume that if it's the brake light switch (and I am pretty sure it is) that there is a loose hot wire with either an exposed uninsulated terminal, or with the insulation skinned off of it, and it's probably swinging around and hitting the frame, or a bolt, and shorting.

krat · 05-24-2023, 12:34 AM

Forget the complications and go to the basics.

Fuel
Air
Spark

Youu know you have spark because it will start and run sporadically.

With EFI you have two other checks, fuel and air/fuel mapping.

You are totally dependent on an electric fuel pump to keep moving so check to see if you have proper fuel pressure, your pump is working, and that your fuel filter is not blocked.

Check for free flow through your air box.

After that check your CDI.

Electrical shorts usually do not cause bogging throttle and popping exhaust. Bad mapping and twitchy fuel pumps do.

**JerryHawk250** · 05-24-2023, 07:40 AM

What bike is this actually on? That would help. More than likely that is some type of vacuum line. You need to locate where that was actually tied into. You could try temporarily plug I to see if it makes a difference in how it runs. Having just a picture of the broken part doesn't tell us what the other end of the hose is hooked to. In order to diagnose the problem we need the full picture of what we are working with. The more information you can provide the easier it will be to help.

05-23-2023, 08:52 PM	#1
Ridelikebrian Join Date: May 2023 Posts: 2	New rider help Hi, I’m a new rider and having mechanical issues with my enduro 250cc but don’t know what. I’ll start by saying it’ was brand new buying it , and I’d ride it about 20-30 miles on it 5 days a week. After a couple months in, I was coming off a stop sign and switching gears was fine until I put it in 4th, then suddenly the bike started bogging down and sputtering. It would then die shortly after. Sometime I can get it to turn back on but if it does it shuts back off or won’t have full power when giving it gas. It has moments where it runs fine for a bit but will not stay well and 100% all day. It’s fuel injected so no carb. Oil was at good level and spark plug still good. There is this thing that looks like a sensor that broke, not sure if that’s related to the problem, I attached pics. And I don’t know what kind of sensor it is. Any help is appreciated . Thanks in advance! : Attached Thumbnails
	0

05-23-2023, 09:53 PM	#3
Boatguy Join Date: Feb 2021 Location: Northeast Posts: 934	I am going to go with Bill Hilly’s idea also. My main power line on the bike chafed through at one time and it behaves exactly like you are describing. I think it’s an electrical problem. They are not fun to find. __________________ 2020 Lifan x-pect
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05-24-2023, 12:34 AM	#6
krat Join Date: Nov 2019 Location: KY Posts: 277	Forget the complications and go to the basics. Fuel Air Spark Youu know you have spark because it will start and run sporadically. With EFI you have two other checks, fuel and air/fuel mapping. You are totally dependent on an electric fuel pump to keep moving so check to see if you have proper fuel pressure, your pump is working, and that your fuel filter is not blocked. Check for free flow through your air box. After that check your CDI. Electrical shorts usually do not cause bogging throttle and popping exhaust. Bad mapping and twitchy fuel pumps do. __________________ %90 of the Chinese motorbikes ever made are still on the road. The other %10 made it back home.
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05-24-2023, 07:40 AM	#7
JerryHawk250 Moderator Join Date: Oct 2016 Location: Houma, La. Posts: 11,713	What bike is this actually on? That would help. More than likely that is some type of vacuum line. You need to locate where that was actually tied into. You could try temporarily plug I to see if it makes a difference in how it runs. Having just a picture of the broken part doesn't tell us what the other end of the hose is hooked to. In order to diagnose the problem we need the full picture of what we are working with. The more information you can provide the easier it will be to help. __________________ 2024 Linhai 300 ATV 4x4 2023 Lifan Lycan 250 Chopper 2023 Venom Evader 2022 Lifan KPX250 2020 Kawasaki Vulcan S (Sold) 2004 Honda ST 1300 2016 Black Hawk 250 (sold) Keihin PE30 carb,125 main,38 slow.Pod filter,ported & decked head 10:1 CR,Direct Ignition Coil,15/40Sprockets,NGK DPR8EIX-9,De-Cat,Dual Oil Cooler,Digital Cluster 2016 Cazador180 XL 2014 Coolster150 JerryHawk250.com My YouTube Channel
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05-23-2023, 09:06 PM	#2
Bill Hilly Join Date: Feb 2021 Posts: 1,003	That actually looks like the rear brake light switch, but you may have a wire shorted because of it.
	1

05-23-2023, 10:36 PM	#4
Ridelikebrian Join Date: May 2023 Posts: 2	I’ll check the wires, but last I checked that sensor isn’t connected to anything else. Also I want to add that sometimes while riding I’ll get the loud popping from the exhaust . So it isn’t a fuel issue?
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