07 M6 EFI Stumbles

[Radar78]

So my daughters 07 M6 really stumbles when starting out. I wouldn’t say it bogs out, just kinda stumbles. I assumed belt deflection but that didn’t fix it. Things I have tried. Cleaned up both the primary and secondary. New primary spring with glide washers. New belt and adjusted the deflection and alignment. Should also mention once she gets into some RPM the sled runs like a top. Any suggestions?


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[mbcat]

How many miles? Guessing worn clutches. Secondary hub is probably done. Also check apv cables. Could be hanging valve in hi port & cause low end bog. Valve cables should pull ez by hand & snap back when released. Make sure free cable ends are adjusted the same length.

 

[Radar78]

How many miles? Guessing worn clutches. Secondary hub is probably done. Also check apv cables. Could be hanging valve in hi port & cause low end bog. Valve cables should pull ez by hand & snap back when released. Make sure free cable ends are adjusted the same length.

About 2300 miles. APV cables should be ok. One didn’t pull smoothly when I bought the sled last spring. Changed it out and adjusted both.


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[Radar78]

How many miles? Guessing worn clutches. Secondary hub is probably done. Also check apv cables. Could be hanging valve in hi port & cause low end bog. Valve cables should pull ez by hand & snap back when released. Make sure free cable ends are adjusted the same length.

What tell tale signs am I looking for while disassembling her secondary?


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[mbcat]

Blown rollers & hourglass ware on hub. Before disassembly spray a lubricant on hub & test drive. If bsckshifts better that's the culprit.

 

[Radar78]

Upon closer inspection if decided the secondary is indeed worn out. Thanks for the help guys.


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[boondocker97]

Bad reeds can also cause it to not perform on the lower end.

 

[Radar78]

Gonna bring this TTT. New secondary didn’t help. Is pulling those reeds a big job?


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[boondocker97]

It's not particularly fun. Tight space to get the throttle bodies out and there's coolant running through them. Can't remember if you have to unhook one of those hoses or not.

 

[Radar78]

What am I looking for? They look fine to me?

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[Radar78]

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[Radar78]

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[Radar78]

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[boondocker97]

Cracked or chipped petals on the edges. Or if the petals aren't making contact with the cage or have low tension and not sealing well against it. Should make a crisp snappy sound against the cage if you lift a corner with a fingernail and let it go.