At my wits end!

Jw73 · 04-02-2021, 05:59 AM

Hi all. I ride a brixton bx 125. Fuel injected. To cut a long story short, I've had intermittent starting problems for a few months now. Sometimes starts first time, some days it doesn't. Recently won't start from hot but if left for 10 mins it will.
Had a new problem last week where the engine would feel like it's bogging down and about to stall when riding but then picks up again. Could be at 5mph or 50mph. Added some redex to fuel and it solved problem for a week or two. Another problem has raised its ugly head the past week. When I'm stationary in traffic, the revs sometimes rise to 4000rpm with throttle closed and clutch lever pulled in. Was fine the next day, but the opposite happened. Idle was fine but revs kept dropping so the bike stalled. Coming home from work yesterday the bike cut out while actually riding it at around 20-30 mph. I thought it may be the throttle position sensor. Replaced that but not cured the problem.

With the new tps fitted, it idles fine but bogs down and stalls when you pull off in first. Put the old one back on and ran fine on way to work but kept cutting out on way home.

Any ideas?! Sorry for the long post too!

culcune · 04-03-2021, 10:50 PM

Quote:

Originally Posted by Jw73

Hi all. I ride a brixton bx 125. Fuel injected. To cut a long story short, I've had intermittent starting problems for a few months now. Sometimes starts first time, some days it doesn't. Recently won't start from hot but if left for 10 mins it will.
Had a new problem last week where the engine would feel like it's bogging down and about to stall when riding but then picks up again. Could be at 5mph or 50mph. Added some redex to fuel and it solved problem for a week or two. Another problem has raised its ugly head the past week. When I'm stationary in traffic, the revs sometimes rise to 4000rpm with throttle closed and clutch lever pulled in. Was fine the next day, but the opposite happened. Idle was fine but revs kept dropping so the bike stalled. Coming home from work yesterday the bike cut out while actually riding it at around 20-30 mph. I thought it may be the throttle position sensor. Replaced that but not cured the problem.

With the new tps fitted, it idles fine but bogs down and stalls when you pull off in first. Put the old one back on and ran fine on way to work but kept cutting out on way home.

Any ideas?! Sorry for the long post too!

Could be electrical issues with the fuel-injection, BUT I would start with a spark plug and move on to adjusting the valve lash (numerous videos on YouTube doing the valves on Chinese bikes). Then I would look into the fuel-injection.

Jw73 · 04-04-2021, 04:18 AM

Cheers for the info pal.

OneLeggedRider · 04-08-2021, 08:44 AM

Not starting when hot is valve lash needing adjustment.

TxTaoRider · 04-08-2021, 09:34 AM

Have you got any fuel lines near the head or exhaust?

Jw73 · 04-10-2021, 04:36 AM

Quote:

Originally Posted by OneLeggedRider

Not starting when hot is valve lash needing adjustment.

Starts OK on occasion when warm now. The fault is intermittent. Main problem now is high idle or revs too low and cutting out.

Jw73 · 04-10-2021, 04:37 AM

Quote:

Originally Posted by TxTaoRider

Have you got any fuel lines near the head or exhaust?

No mate. Fuel line comes from tank and straight into the fuel injector.

Brian1976 · 01-24-2022, 01:55 PM

Check your temp sensor.they can cause all sorts of starting problems.and make it run lean or rich

04-02-2021, 05:59 AM	#1
Jw73 Join Date: Jan 2021 Posts: 15	At my wits end! Hi all. I ride a brixton bx 125. Fuel injected. To cut a long story short, I've had intermittent starting problems for a few months now. Sometimes starts first time, some days it doesn't. Recently won't start from hot but if left for 10 mins it will. Had a new problem last week where the engine would feel like it's bogging down and about to stall when riding but then picks up again. Could be at 5mph or 50mph. Added some redex to fuel and it solved problem for a week or two. Another problem has raised its ugly head the past week. When I'm stationary in traffic, the revs sometimes rise to 4000rpm with throttle closed and clutch lever pulled in. Was fine the next day, but the opposite happened. Idle was fine but revs kept dropping so the bike stalled. Coming home from work yesterday the bike cut out while actually riding it at around 20-30 mph. I thought it may be the throttle position sensor. Replaced that but not cured the problem. With the new tps fitted, it idles fine but bogs down and stalls when you pull off in first. Put the old one back on and ran fine on way to work but kept cutting out on way home. Any ideas?! Sorry for the long post too!
	1

04-08-2021, 08:44 AM	#4
OneLeggedRider Join Date: Nov 2018 Location: Stockport, Oh. Posts: 1,442	Not starting when hot is valve lash needing adjustment. __________________ ~ Don't poke the bear ~ M.M.I. Dean's List graduate class of '95 and Specialty welder 2020 Ice Bear Terifecta 150cc Trike 2011 Honda Foreman 500ES 4x4 2001 Polaris Scrambler 400
	1

04-08-2021, 09:34 AM	#5
TxTaoRider Join Date: Oct 2020 Location: Flower Mound Texas Posts: 904	Have you got any fuel lines near the head or exhaust? __________________ 2021 Tao Tbr7 - "Lucille" Mods so far- Brozz swingarm, 21" front rim (Bridgestone Tw302 rear/Dunlop D606 front tires), Digital gauge cluster, pz30b pumper carb, after market hand guards, aftermarket brake and clutch levers, round fold away mirrors, Fly handlebars shortened slightly, 13t front sprocket 2009 Q-link Legacy 250 1982 Suzuki GS1100ES - "Jolene"
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04-04-2021, 04:18 AM	#3
Jw73 Join Date: Jan 2021 Posts: 15	Cheers for the info pal.
	1

01-24-2022, 01:55 PM	#8
Brian1976 Join Date: Jan 2022 Location: Arkansas Posts: 1	Check your temp sensor.they can cause all sorts of starting problems.and make it run lean or rich
	0