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Old 06-30-2013, 02:34 PM   #1
Queen of Spades OP
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Location: Decatur, GA
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30% less power after oil & air filter change. What have I done to my baby?

99 LC4-e. Changed oil and filter today - used full synthetic. Drained both the frame and engine using creeper's post as a guide. Also swapped out the old air filter with a new pre-oiled filter.

Bike starts and idles fine. Has good, crisp throttle response at idle. Hopped on for a ride and to my dismay, the bike feels like a 250 instead of a 640. Mid and top end power are gone. Has a little torque off the bottom, then hits a wall.

What in God's name have I done to my poor baby? What could possibly be causing this sudden loss of power? She was running like a scalded dog this morning (as usual).
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Old 06-30-2013, 03:00 PM   #2
mcma111
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You did BURP the oil in the frame I hope.
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Old 07-01-2013, 06:24 AM   #3
Queen of Spades OP
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Quote:
Originally Posted by mcma111 View Post
You did BURP the oil in the frame I hope.
Every time.

Anyway, I eventually discovered my fuck-up, which was not examining the bottle on the shelf more closely. Got the type with friction reducing additives, and my loss of power was just clutch slippage.

Went back and got 4 more bottles of the correct oil (Mobile 1 4T racing oil), and two new filters. After the first flush and refill my bike was back to normal. I rode it for a few more miles, then flushed and refilled again to be sure.
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Old 07-01-2013, 06:28 AM   #4
sandsman
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Expensive mistake, at least you didnt fry the cluth. I would have guessed an overfill. Lucky you. Safe riding brotha.
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Old 07-01-2013, 09:12 AM   #5
Reposado1800
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If your clutch is slipping you need a new clutch.
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Old 07-01-2013, 09:15 AM   #6
Queen of Spades OP
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The thought crossed my mind as I discovered what I had done.

However, it is not slipping now. The slipping stopped about 15 seconds on my warm-up ride following the first oil flush. I could feel the clutch slipping, then grabbing on, and it didn't slip again on the warm-up ride. I drove around for 20 minutes, then flushed and refilled again just in case. There is no clutch slippage now. So, how can the clutch work fine now, yet still be ruined?
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Old 07-01-2013, 09:20 AM   #7
Reposado1800
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It is getting worn out. A new pack of friction plates and it will be good as new.
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Old 07-01-2013, 09:20 AM   #8
elsalvadorklr
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just keep flushing the oil with cheap stuff and ride easily

the friction modifiers may have soaked the fibers and can sometimes not be eliminated and you will have a poor performing clutch...you rode for so little you might get lucky

i had this happen on my xr...the clutch was old so it wasnt such a deal breaker for me as a new one was needed but it sucks anyway...
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Old 07-01-2013, 09:38 AM   #9
Queen of Spades OP
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Quote:
Originally Posted by elsalvadorklr View Post
the friction modifiers may have soaked the fibers and can sometimes not be eliminated and you will have a poor performing clutch...you rode for so little you might get lucky
Yeah, I didn't get a mile down the road before realizing something was off. Quickly turned around, rode into the shop and dumped the oil & filter pronto. Then went to the store for supplies.

Hoping I get off with 2 flushes and no lasting effect on the plates. The bike has 14k so it wouldn't hurt to replace the friction plates.. my bank account disagrees of course.
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Old 07-01-2013, 09:46 AM   #10
NJ-Brett
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You can not tell a slipping clutch from a loss of power????
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Old 07-01-2013, 09:59 AM   #11
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Quote:
Originally Posted by NJ-Brett View Post
You can not tell a slipping clutch from a loss of power????


Damn. Yes. As noted earlier, the bike was driven less than a mile. I lost a clutch on a KX250 and remember what that was like. This felt different.
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Old 07-01-2013, 10:50 AM   #12
JensEskildsen
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I wouldnt bother to flush it, as you say it works again.
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Old 07-01-2013, 11:00 AM   #13
Queen of Spades OP
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Quote:
Originally Posted by JensEskildsen View Post
I wouldnt bother to flush it, as you say it works again.
The oil and filters were changed twice immediately following a short 5 minute ride where I noticed something wrong.

The clutch appears to be working OK now, but that was only after a couple warm-up rides following both oil flushes. Hope the friction plates are OK. If not, I'll order a new set.

Thanks for your concern.
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Old 07-01-2013, 11:58 AM   #14
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I made the same mistake right before leaving for a 400mi ride and the clutch slipped the entire time if I did any horsing around. Got home and pulled the clutch out and tried to clean all the oil off in my parts cleaner,deglazed the metal plates and it still slipped even though the stack height was good. New clutch solved the problem.
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Old 07-01-2013, 12:35 PM   #15
jon_l
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I'd quit stressing about it and ride. If it feels fine now, it almost certainly is. Lots of folks have put car-oil in their bikes, many intentionally.
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