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2015 Brutale Dragster 800 Engine Shut Down when downshift

7.4K views 19 replies 11 participants last post by  Stephen W.  
#1 · (Edited)
Hi all, I am new to this forum and I just picked up my Dragster 800 in November. This is my first MV Agusta and I like it so much. Last night I was exiting on freeway with 3rd gear, after the turn before comes to a stop at the red light, I was trying to downshift to 2nd and rev match. However, my bike suddenly shut down and the tail was shaking really bad. I had to pull in the clutch lever and regain balance. I almost dropped my bike but luckily I was able to save it. Has anyone of you experienced this?
 
#12 ·
Yes I did pull in the clutch. I was downshifting and rev match.

Bit of a concern reading that. How fast was you going when it happened? I read it stops working below 30mph
It was approximately 30mph downshift to 2nd gear and rev match.

Stalling on clutch in is a known issue. It's either TPS or throttle body sync related. Have your MV mechanic check that the throttle body air screws are in sync. The throttle that feeds cylinder #1 was incorrect on my bike. This is what caused my bike to stall on clutch in. As the revs dropped because the ECU reads #1 cylinder only it starved the other two cylinders of fuel.
You can read my sad tail in my thread, "Happy anniversary to me, NOT!!!!"
I have just completed my first service. By the way, what exactly does it need to be complete on first service besides oil change, check and tighten loose bolts?

Good luck and welcome to the forum.

Where in Ca are you located?
I am located in Pasadena area. I have purchased my Dragster 800 in San Diego. =)
 
#6 ·
Stalling on clutch in is a known issue. It's either TPS or throttle body sync related. Have your MV mechanic check that the throttle body air screws are in sync. The throttle that feeds cylinder #1 was incorrect on my bike. This is what caused my bike to stall on clutch in. As the revs dropped because the ECU reads #1 cylinder only it starved the other two cylinders of fuel.
You can read my sad tail in my thread, "Happy anniversary to me, NOT!!!!"
 
#10 ·
Ah… nope, it’s the other way around. If the air screws are out of sync and the ECU reads #1 as lean it’ll richen up the fuel mixture making #2 & #3 richer. If it reads #1 as rich, the ECU will lean out the fuel mixture making #2 & #3 leaner.
So #1 pipe should be the correct colour. Pipes #2 & #3 will be a different colour only if they are running hotter or colder than #1. (leaner or richer) Make sense?
 
#11 ·
Hi all, I am new to this forum and I just picked up my Dragster 800 in November. This is my first MV Agusta and I like it so much. Last night I was exiting on freeway with 3rd gear, after the turn before comes to a stop at the red light, I was trying to downshift to 2nd. However, my bike suddenly shut down and the tail was shaking really bad. I had to pull in the clutch lever and regain balance. I almost dropped my bike but luckily I was able to safe it. Has anyone of you experienced this?

Good luck and welcome to the forum.

Where in Ca are you located?
 
#15 ·
You should always balance multicylinder engines otherwise they won't run smoothly.When balancing it is usual to have a master cylinder and match the others to that. If the ECU takes signals from sensors on No1 cylinder then you need the others to be matched to it in the first place to run smoothly as long as the ecu is adjusting all cylinders equally.
 
#19 ·
I've had the same problem with my Dragster. Coming off the ramp it quietly dies. Its not pilot error. ProItalia replaced the Sprag clutch on my bike, problem was solved… until about 500 miles later, it continued to shut down. They think I'm crazy, I occasionally mount an action cam over the tank to record the bars and instrumentation. Sadly, I haven't caught it on film =(
 
#20 ·
The Sprag has nothing to do with stalling. It is possible however, that other adjustments were made at that time. If it's throttle body related it'll happen again. Just be prepared for when it does.