Engine shut off while downshifting - Page 10

Dualsport Chic · 03-09-2018, 06:21 PM

@2LZ - I had the same thing happen - going down a steep hill to a stop close to my starting off point - happened a few times come to think of it. After my valve adjustment there was an improvement - but still will do it if I'm not careful to ensure I get the R's up a bit.

2LZ · 03-12-2018, 10:37 AM

Quote:

Originally Posted by Dualsport Chic

@2LZ - I had the same thing happen - going down a steep hill to a stop close to my starting off point - happened a few times come to think of it. After my valve adjustment there was an improvement - but still will do it if I'm not careful to ensure I get the R's up a bit.

I'm really thinking it's lazy injector mapping and the IAC doesn't react quickly enough, especially at transitional temps.
The "long downhill theory" is that the R's are pretty high on a long coast as I'm using a lot of engine braking as to not ride the brakes. Then when I pull in the clutch (approaching the stop sign) and the R's suddenly tank, the IAC is late on the uptake. Probably why it will restart right away like absolutely nothing is wrong. The IAC finally showed up on the scene.

Just a theory. As I've stated in past threads, I'd like to here from our carbureted folks here and see if they have the same issue.

Azhule · 03-12-2018, 12:25 PM

And this is why the problem never gets found out or fixed...

Nothing to see here folks, everything is normal with your stalling Chinese bike... just go back to riding your RX3 after you add this statement to the CSC owners manual... must have gotten lost somewhere in translation but I found it and here it is properly translated for you

"To prevent stalling of the high quality Zongshen engine and to prevent problems with the Delphi EFI system - 1) Set valve clearances before every time you plan to ride your RX3. 2) Add Lucas Fuel Treatment to every tank of gas. 3) 'Blip' the throttle at least 2 or 3 times quickly every time you pull in the clutch lever and the RPMs begin to drop down below 3,000"

2LZ · 03-12-2018, 03:27 PM

I do 2) every fill!
I really would love to rip the injection off and put a good carb on it. Engine modding would make a difference then, not being held captive by a map.

Naci63 · 03-16-2018, 01:15 AM

Solution of this stalling problem is to adjust valve clearences first then "reset" the engine by swithching on and off 5 times very quickly, feeling each time the fuel pump vibration. Wait 20 minutes after the switch is off on the fifth time. I believe your problem will disapear.

2LZ · 03-16-2018, 10:38 AM

Quote:

Originally Posted by Naci63

Solution of this stalling problem is to adjust valve clearences first then "reset" the engine by swithching on and off 5 times very quickly, feeling each time the fuel pump vibration. Wait 20 minutes after the switch is off on the fifth time. I believe your problem will disapear.

I reset the ecm after every maintenance, whether an oil change, valve adjust or any time it's on my rack. It's better for a while but eventually returns.
The real irritating part is that my wife's blue RX3 constantly runs perfect! :-O

rjmorel · 03-23-2018, 03:29 PM

"The real irritating part is that my wife's blue RX3 constantly runs perfect! :-O "

It's the rider then

rj

MalcolmReynolds · 04-12-2018, 09:57 PM

How wide spread is this issue? This is more than a little concerning. I don't own an RX3, but if I did and my bike was doing this I would be more than a little upset. Has CSC come up with any theories on what is going on here?

2LZ · 04-13-2018, 03:13 PM

Quote:

Originally Posted by MalcolmReynolds

How wide spread is this issue? This is more than a little concerning. I don't own an RX3, but if I did and my bike was doing this I would be more than a little upset. Has CSC come up with any theories on what is going on here?

CSC basically says to make sure the valves are adjusted and the connections are good, including battery.

It's not a regular deal. Just once in a while, usually in transition temps. I can take it out a bunch of times with no issues. Just something that happens sporadically that we can all chatter about. It's not like you're going down the road and it shuts off.

MalcolmReynolds · 04-19-2018, 09:22 AM

Not all bikes are affected? Since you suspect an ECU how hard is it to replace? What is the cost to replace it? Seems odd that a valve adjustment would make it quit stalling if it were an electrical gremlin.

2LZ · 04-20-2018, 10:40 AM

Quote:

Originally Posted by MalcolmReynolds

Not all bikes are affected? Since you suspect an ECU how hard is it to replace? What is the cost to replace it? Seems odd that a valve adjustment would make it quit stalling if it were an electrical gremlin.

I don't have concrete answers, just suspisions.
I don't believe the ECU is "bad". I just think that due to the CARB regulations, they lean it out and the IAC doesn't react quickly enough on the rare occasion. One small throttle blip on downshift eliminates the issue.

willy dog · 04-20-2018, 12:52 PM

you do know that zong stopped making the blue rx3 they were just too fast

2LZ · 04-20-2018, 01:09 PM

Quote:

Originally Posted by willy dog

you do know that zong stopped making the blue rx3 they were just too fast

That's why I got the 300cc kit. Hopefully I'll be able to keep up with Mrs. 2LZ blue one now!

rjmorel · 04-20-2018, 01:27 PM

I'm very interested in what this kit will do to the RX3. May get better mileage not working so hard. All of you who bought this kit will be interesting to hear your thoughts on performance , mileage , Ease of swap, highway power, etc. Looking forward to your road tests. Yah, Go team, rj

2LZ · 04-20-2018, 02:45 PM

Quote:

Originally Posted by rjmorel

Ease of swap,Yah, Go team, rj

According to Spud's tutorial, you drop the motor.
Chonda didn't have to in his PP. If I do have to drop the motor, I'm painting the entire top end black. I always thought it was a little funny looking to have the black side cases with a sliver head sticking up.
Besides, having the motor on the bench will be the easiest valve adjustment ever performed!

03-09-2018, 06:21 PM	#136
Dualsport Chic Join Date: Feb 2016 Location: Western, CT Posts: 168	@2LZ - I had the same thing happen - going down a steep hill to a stop close to my starting off point - happened a few times come to think of it. After my valve adjustment there was an improvement - but still will do it if I'm not careful to ensure I get the R's up a bit. __________________ Carpe Diem IBA#65836 2005 BMW F650gs 2008 Yamaha XT250 2013 Yamaha XT250 2009 Suzuki Gladius
	0

03-12-2018, 12:25 PM	#138
Azhule Join Date: Dec 2015 Location: CO Posts: 1,525	And this is why the problem never gets found out or fixed... Nothing to see here folks, everything is normal with your stalling Chinese bike... just go back to riding your RX3 after you add this statement to the CSC owners manual... must have gotten lost somewhere in translation but I found it and here it is properly translated for you "To prevent stalling of the high quality Zongshen engine and to prevent problems with the Delphi EFI system - 1) Set valve clearances before every time you plan to ride your RX3. 2) Add Lucas Fuel Treatment to every tank of gas. 3) 'Blip' the throttle at least 2 or 3 times quickly every time you pull in the clutch lever and the RPMs begin to drop down below 3,000" __________________ "Think as you like... but this self proclaimed Professor is always right" - Buckshot "You never know what someone is hiding beneath their smile..." - NinjaTom - R.I.P.
	1

03-12-2018, 03:27 PM	#139
2LZ Join Date: Mar 2010 Location: Volcano, Ca Posts: 7,065	I do 2) every fill! I really would love to rip the injection off and put a good carb on it. Engine modding would make a difference then, not being held captive by a map. __________________ "Light a fire for a man, and you heat him for a day. Light a man on fire, and you heat him for the rest of his life." 2007 Suzuki DRZ400S (SM convert) 2009 Q Link XP 200 1967 BSA B25 250cc Starfire 2022 Royal Enfield Interceptor 650 2023 Royal Enfield Scram 411 1948 Royal Enfield Model G 350
	0

03-16-2018, 01:15 AM	#140
Naci63 Join Date: Jan 2017 Location: Turkey Posts: 10	Solution of this stalling problem is to adjust valve clearences first then "reset" the engine by swithching on and off 5 times very quickly, feeling each time the fuel pump vibration. Wait 20 minutes after the switch is off on the fifth time. I believe your problem will disapear. __________________ 2016 Mondial RX3i; 2003 Bmw R 1150R (2009-2017); 2006 Honda Shadow VT 750 C (2009-2010); 2006 Ramzey QM 250 Cruiser (2006-2010); 2006 Ramzey QM 200 Enduro (2006-2009); 1990 Jawa 350 cc (1990-1993); 1979 Puch (1979+).
	3

03-23-2018, 03:29 PM	#142
rjmorel Join Date: May 2007 Location: Warshington Posts: 928	"The real irritating part is that my wife's blue RX3 constantly runs perfect! :-O " It's the rider then rj __________________ Live Zong, and Prosper
	2

04-12-2018, 09:57 PM	#143
MalcolmReynolds Join Date: Apr 2018 Location: Colorado Posts: 29	How wide spread is this issue? This is more than a little concerning. I don't own an RX3, but if I did and my bike was doing this I would be more than a little upset. Has CSC come up with any theories on what is going on here?
	0

04-19-2018, 09:22 AM	#145
MalcolmReynolds Join Date: Apr 2018 Location: Colorado Posts: 29	Not all bikes are affected? Since you suspect an ECU how hard is it to replace? What is the cost to replace it? Seems odd that a valve adjustment would make it quit stalling if it were an electrical gremlin.
	0

04-20-2018, 12:52 PM	#147
willy dog Join Date: Oct 2015 Location: vermont Posts: 238	you do know that zong stopped making the blue rx3 they were just too fast __________________ Peace and Zong Life
	1

04-20-2018, 01:27 PM	#149
rjmorel Join Date: May 2007 Location: Warshington Posts: 928	I'm very interested in what this kit will do to the RX3. May get better mileage not working so hard. All of you who bought this kit will be interesting to hear your thoughts on performance , mileage , Ease of swap, highway power, etc. Looking forward to your road tests. Yah, Go team, rj __________________ Live Zong, and Prosper
	0