Lose a piston?

[galljr13]

Out riding today on my 2018 M8000, 750 miles, and suddenly lost about 50% or more of my power. Sled still idles and can hit a weak 5800 rpms. Its struggling but got me the 9 miles out with no change to loss in power. Intake had some condensation in it but no snow ingestion. Pulled the plugs and they looked odd to me. Thoughts?

 

[Octanee]

Did you scope it? I'd do a compression test for sure that'll tell you quickly whether its a mechanical issue or electrical. Plug coloring i'm not too experienced there to give a experienced guess, It don't look rich, don't look lean either,

 

[Frostbite]

It almost looks like rust on your plug? Could it be water getting into the intake and then getting into the cylinder?

 

[kgra]

Looks like bad fuel. Put new plugs in it and try it.

 

[kanedog]

Looks like you recently cut your fingernails. Great grooming!

 

[Old & slow]

Plugs look fine, check compression, check exhaust valves for proper operation. Check belt and clutches also.

 

[Dam Dave]

Broken primary spring, very common

 

[PaulAnd]

Looks like you recently cut your fingernails. Great grooming!

Now that put a smile on my face!
Thanks Kanedog!


Sent from my iPhone using Tapatalk

 

[summ8rmk]

Any codes on the gauge?

Sent it

 

[kiliki]

Broken primary spring, very common

750 mile on mine and 2 primary spring toast.
speed werx H5 120-310 if you ride 5-8 or 125-340 if you ride 7k and up. no adapter cup needed. use the spring for the 15 and back cat.

 

[clutch]

You're saying to use the older clutch style spring without the adapter?