Sudden power loss

[larryhood]

On my first time out this season my 2007 Ultra was running great...for a while. After getting to 7850 RPM's there was a sudden total loss of power followed by continuing hesitations upon acceleration attempts.
Continuing efforts to accelerate eventually smoothed out the hesitations but the maximum RPM's dropped to 7750+/-.
The Ski now runs smoothly but maximum RPM's are down. All recalls have been done. 15 hours on a stock Ski with a wedge.
Any ideas about the cause of the problem and possible fixes?
I hope every had a safe and fun Memorial Day. The water at Lake Cumberland Kentucky was 67 degrees but the weather was great!

Thanks in advance for your help and ideas.

[Skips313]

Try replacing the plugs. It sounds as though your having one go out on you.

[sportman]

i have no idea what happen to ur ski but can you tell me what was ur lowest rpm?

[Region8Ultra250X]

i am experiencing the same thing.... whagt was th cheap source for plugs again.... my dealer was asking 20 a piece for the champions

[spaulding]

cr9ek from advance less than $6.

[cjm780]

cr9ek from advance less than $6.

Have you used the cr9ek plugs, in your ski yet? They good enough to run for awhile or just to get you out of a bind? I was going to go to the dealer and pick up a set. Was running around 7300-7500 RPMs yesterday. I figured it would be wise to keep a set in my ski just incase.

[larryhood]

The Ski now has cr9ek plugs that replaced the original plugs at about 6 hours. My dealer gave me new OEM plugs when the recalls were done and I will change to those asap.
COULD A BAD PLUG CAUSE THE ULTRA THAT WAS PERFORMING WELL @7850 RPM'S TO LOSE POWER COMPLETELY,THEN GO THROUGH A PERIOD OF HESITATION AND THEN RETURN TO SMOOTH OPERATION BUT AT A MAX RPM OF 7750?
This all took place within a 5-10 minute period. I even raced another Ultra after the lower RPM"s and held my own. But, I know that with the original performance of the day I would have performed better.
I'm curious for explanitions...and will change the plugs.
Thanks for the replies.

[ercBOOSTED]

Plugs going bad do cause a loss of power. Last year, my ski was idling rough and top speed was done about 1-2 mph. Skip helped me out and sold me a set an extra set and overnighted them so I could have them for the weekend. The rough idling was gone and I got my speed back. I haven't tried the other plugs yet, probable won't unless I cant get the regular plugs. I got lucky and found a new set on ebay for $41 for the set of four. Can't beat that. I always keep an extra set in the truck just in case.

[HYNES]

Most def. the plugs happened to me twice already.

[spaulding]

I have about 5 hours on the cr9ek plugs.