At wits end

[SpudRider]

I don't think riding with a bad battery will damage the EFI system. Do you have a good, spare battery with which you can experiment?

[pete]

The XT660s can have stalling issues...
usaly a combination of low idle speed
& TPS setting...



..

[detours]

Fishman, I may have missed this in the thread, but what is your idle RPM? Is it steady at idle or does the needle wander a lot?

[fishman10]

the idle is nice an smooth ,,, ithink around 1500rpm

[detours]

Originally Posted by fishman10

the idle is nice an smooth ,,, ithink around 1500rpm

Maybe not relevant to your issue, but my idle was set at the factory to 1700. Actually, when it first starts, it goes to 1800 for a second, then drops to 1700. But there's so little torque even at 1700, I'd be afraid it would stall if I set it any lower.

[SpudRider]

Mine RX3 stalled on me today as I coasted to a stop light in 3rd gear. When I tapped the starter button, the engine started immediately, and the bike didn't stall again for the rest of the ride. It has been weeks since the last time the engine stalled in this manner. I think it's normal for some bikes with EFI to exhibit this phenomenon. However, when I follow my usual practice, and downshift all the way to first gear as I decelerate, my engine never stalls.

[fishman10]

well ,ive kept pretty silent for awhile,,trying different stuff that csc has told me to try without success> MY rx3 is still stalling everyday,,an NO my valves are NOT tight,,,,,an it seems csc has given up ,,as they quit responding after i told them it wqs still doing it.I requested they send me a new ecm ,,just to try it ,,an i would send it back ,if it did not fix it,,,also was wondering if the clutch safety switch could have a defect causing this,,as the stalling always occurs when im coming to a stop ,pulling in the clutch...The other day it stalled in heavy traffic,,almost got me killed.I love the bike ,,but cant take it anymore. If i had a wish ,,i wish i coukld return it,for another ,,or just credit me an i will put it towards a 450 when they come out..I really want to be part of the program to show it to prospective buyers an help them prosper an sell more bikes,,But i cant have some one look at it and lie to them ,,,Im bummmed.

[SpudRider]

Your bike is still under warranty for parts and labor, Fish. You could have CSC send you the Motor Scan to diagnose the ECU, or you could take the bike to a shop. I'm sure the problem can be resolved.

I'm not saying you are wrong, but every time my bike stalls like this, I discover the valves are tight. I will be adjusting the valves again this morning. I need to adjust the valves about every 2,500 miles, just as Zongshen recommends.

[fishman10]

only 800 miles since valve adjust,,i can here them now slightly ticking ,since the adjust ,, an as i have stated ,,i have requested from csc an they were helpful for awhile,,,but i guess they got tired of me ,,cause they have stopped responding.

[fishman10]

weld ,,,i do have a new one ,,i ordered off taebo,,,, good idea i will try it.

[Weldangrind]

Fish, if it was the clutch switch, I'm guessing it would be repeatable. In other words, you should be able to make the bike stall while sitting in neutral, and just pulling and releasing the clutch. If that won't make it stall, I don't suspect the clutch switch.

If you were riding an older China bike, I'd say the CDI is on the way out. Have you tried a new one?

[SpudRider]

Originally Posted by Weldangrind

Fish, if it was the clutch switch, I'm guessing it would be repeatable. In other words, you should be able to make the bike stall while sitting in neutral, and just pulling and releasing the clutch. If that won't make it stall, I don't suspect the clutch switch.

If you were riding an older China bike, I'd say the CDI is on the way out. Have you tried a new one?

I don't think the RX3 has a clutch safety switch. Also, I believe the EFI bikes don't have a CDI unit. I think only the bikes with carburetors have a CDI unit.

[fishman10]

There are two wires on the clutch perch assembly,They seem to only affect the starting in gear with the clutch pulled in ,im just grasping at anything electrical. CSC must have seen the post,,as they called an are sending the scan tool for me to use an hopefully find the problem.Also they are sending a complete throttle body with sensors to try.This could be it as mine sometimes requires 2 or 3 attempts to get it fired as it stalls quickly at start up and it does not go into that fast idle that should occur at cold start up..So once again csc is standing by their product an help solve the issue,,So a big thanks to csc,,!!! also i will send the old parts back for testing.

[SpudRider]

Originally Posted by fishman10

There are two wires on the clutch perch assembly,They seem to only affect the starting in gear with the clutch pulled in ,im just grasping at anything electrical...

You're right. I seem to remember removing the two wires when I worked on the clutch lever. I was fooled because I tried starting the bike with the clutch disengaged, and the bike started. However, I was in neutral at the time. My Honda CRF250X won't start in neutral if the clutch is disengaged.

Originally Posted by fishman10

...CSC must have seen the post,,as they called an are sending the scan tool for me to use an hopefully find the problem.Also they are sending a complete throttle body with sensors to try.This could be it as mine sometimes requires 2 or 3 attempts to get it fired as it stalls quickly at start up and it does not go into that fast idle that should occur at cold start up..So once again csc is standing by their product an help solve the issue,,So a big thanks to csc,,!!! also i will send the old parts back for testing.

I knew CSC would take care of you. The customer service and warranty coverage from CSC are absolutely superb.

[Weldangrind]

I hope that the new parts solve it for you, Fish. Please let us know what happens.