Bump Stall

gwowzer · 06-17-2021, 10:59 PM

My Brozz is doing great. Love the thing.
I have noticed, however, if I am mounting a log or going over some sort of obstacle that creates a decent bump or otherwise climb something that involves a bump of the bike, the engine will just die. I'm not doing anything the bike shouldn't be able to handle or motocross jumps or anything. As a matter of fact, the only reason I didn't make it over said obstacles is because the engine just quits.
It doesn't sputter, squelch, squeak, whine, moan, or bitch. It just big bump going slowly when it impacts and forks compress... dead instantly.
Any idea what could be causing this?

TxTaoRider · 06-18-2021, 05:44 AM

I'd guess at something electrical. Maybe a wire being pinched, grounded, or a connection loose?

ChillRider · 06-18-2021, 08:08 AM

I've heard of sidestand cutoff switches being triggered by bumps and jumps, even minor ones like climbing a sidewalk at slow speed. Some people even went as far as removing/neutering them.

Hunnicutt · 06-18-2021, 08:20 AM

Are you running stock carb jets? I wonder if your bike is too lean. The reason I ask is that my stock TT250 was anemic prior to swapping out the factory main jet. I didn't have the power to get out of my own way. I now have a 112 and it runs like a dream.

herbie · 06-18-2021, 09:27 AM

I know you can shut the bike off with the remote, any chance the remote is bouncing around on the key switch and hitting the button? Try riding in the same place with the remote in your pocket and see if it still does it.

franque · 06-18-2021, 10:11 AM

Sometimes there's a sensor on bikes that makes them automatically shut off when a certain angle away from normal is exceeded, usually when the bike is on its side. It could be that. Does it shut off doing a wheelie?

gwowzer · 06-19-2021, 01:04 PM

Doing a wheelie doesn't shut it off. It's happened when I've had the bike started with the key, so I don't think it is a remote fob button issue. I've started the bike and tugged and pulled on wiring and that won't do it.
It's almost like the bump makes the engine miss or do something weird. But is doesn't peter out, or stall out. It just dies instantly. The Brozz does not have a kickstand shutoff, or a clutch safety.

gwowzer · 06-19-2021, 01:05 PM

Oh and the bike stays running if I drop it over on it's side

06-17-2021, 10:59 PM	#1
gwowzer Join Date: Aug 2019 Location: Central Ohio Posts: 297	Bump Stall My Brozz is doing great. Love the thing. I have noticed, however, if I am mounting a log or going over some sort of obstacle that creates a decent bump or otherwise climb something that involves a bump of the bike, the engine will just die. I'm not doing anything the bike shouldn't be able to handle or motocross jumps or anything. As a matter of fact, the only reason I didn't make it over said obstacles is because the engine just quits. It doesn't sputter, squelch, squeak, whine, moan, or bitch. It just big bump going slowly when it impacts and forks compress... dead instantly. Any idea what could be causing this?
	0

06-18-2021, 05:44 AM	#2
TxTaoRider Join Date: Oct 2020 Location: Flower Mound Texas Posts: 904	I'd guess at something electrical. Maybe a wire being pinched, grounded, or a connection loose? __________________ 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"
	1

06-18-2021, 08:20 AM	#4
Hunnicutt Join Date: Apr 2021 Location: Central Florida Posts: 103	Are you running stock carb jets? I wonder if your bike is too lean. The reason I ask is that my stock TT250 was anemic prior to swapping out the factory main jet. I didn't have the power to get out of my own way. I now have a 112 and it runs like a dream. __________________ ___________________________________ 2021 CSC TT250 - Silver (Mine) "Buzz" 2021 CSC TT250 - White (Wife's) "Seymour" 2021 CSC TT250 - White (Daughter's) "Gemini" Last edited by Hunnicutt; 06-18-2021 at 01:56 PM.
	0

06-18-2021, 09:27 AM	#5
herbie Join Date: May 2019 Location: Illinois Posts: 864	I know you can shut the bike off with the remote, any chance the remote is bouncing around on the key switch and hitting the button? Try riding in the same place with the remote in your pocket and see if it still does 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
	0

06-18-2021, 08:08 AM	#3
ChillRider Join Date: Jun 2020 Location: A small country with a funny name Posts: 164	I've heard of sidestand cutoff switches being triggered by bumps and jumps, even minor ones like climbing a sidewalk at slow speed. Some people even went as far as removing/neutering them.
	2

06-18-2021, 10:11 AM	#6
franque Join Date: Nov 2017 Location: Marseille, France -> Conakry, Guinea Posts: 1,481	Sometimes there's a sensor on bikes that makes them automatically shut off when a certain angle away from normal is exceeded, usually when the bike is on its side. It could be that. Does it shut off doing a wheelie?
	0

06-19-2021, 01:04 PM	#7
gwowzer Join Date: Aug 2019 Location: Central Ohio Posts: 297	Doing a wheelie doesn't shut it off. It's happened when I've had the bike started with the key, so I don't think it is a remote fob button issue. I've started the bike and tugged and pulled on wiring and that won't do it. It's almost like the bump makes the engine miss or do something weird. But is doesn't peter out, or stall out. It just dies instantly. The Brozz does not have a kickstand shutoff, or a clutch safety.
	0

06-19-2021, 01:05 PM	#8
gwowzer Join Date: Aug 2019 Location: Central Ohio Posts: 297	Oh and the bike stays running if I drop it over on it's side
	0