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Old 07-15-2013, 07:41 AM   #16
Rockwell OP
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That would be under the air box?

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Old 07-15-2013, 10:09 AM   #17
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Quote:
Originally Posted by Rockwell View Post
That would be under the air box?

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Yes.

Item #33 page 22 in engine section of 990 parts manual.
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Old 07-15-2013, 12:19 PM   #18
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I replaced the oil pressure sensor last week.
Had similar symptoms as OP, initially thought base gasket was gone
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Old 07-19-2013, 07:27 PM   #19
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Hey!

Get all of this crap straightened out and get the Ride Report on track! Every once and a while, my 990 seems to surge alot, but if I tighten the throttle lock, no surging! So it must be me!

Will it be a new RR or a continuation of the old one?

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Old 07-23-2013, 01:27 PM   #20
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Oil leak seems to be worked out. Pretty sure it was the slightly damaged gasket on the valve cover.

I stopped in Moncton at Toys For Big Boys to pick up some parts that I ordered and to have my tires balanced. The mechanic bet his last beer that the jerkiness is due to a stretched chain. This makes sense since, not too long before I experienced the jerkiness, I had a bad stall, fully-loaded with passenger on a downhill. Bike bucked a few times, so I figure that is when the chain got stretched out.

Going to order a new chain and sprockets, but I'd like to get some more miles out of the current ones since they are only 10,000 km old.

Will get the ride report back on track soon hopefully. We're 5 weeks into the trip. Currently in Saint John, New Brunswick camping out trying to wait out the rain to finish the oil change I started just before it began to pour down. Should be heading into the US tomorrow.

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Old 07-23-2013, 03:17 PM   #21
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Ummm, chains don't stretch when you stall your bike, no matter how many times it bucks.....
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Old 07-24-2013, 09:02 AM   #22
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Oh. I read that here: http://wiki.answers.com/Q/Will_stall...orcycle_engine

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Old 07-24-2013, 09:21 AM   #23
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Chains don't ever really "stretch". Wear occurs between the rollers and pins, allowing a chain to become longer, but if you measure the actual plates of a "stretched" chain, they are the same dimensions as new.

Key word in the answer you linked is "perhaps". Denotes a poster who knows little of the mechanics of drivetrains.

Transmission damage is theoretically possible, but in reality not likely.

As for the "jerkiness", a worn/loose chain can cause this. How many miles are on your drivetrain? Do you know how to check for chain wear? I typically get between 12k to 18K out of a chain, depending on how well I maintain them.

Best way to check is to pull on a link of the chain at the BACK of the rear sprocket. If you can lift the chain 1/2 way off the tooth, it's time to start thinking about replacement. Hooked or "sharp" teeth on the sprocket are a sure sign it's toast. Be sure to replace as a set. New chain + old sprockets = accelerated wear.
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Motomedic screwed with this post 07-24-2013 at 09:29 AM
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Old 07-24-2013, 09:41 AM   #24
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My original chain lasted for 40,000 km. I noticed an increase in adjusting the chain tension and finning of the rear sprocket. I replaced the chain and both sprockets at 40,000 km. That was only 10,000 km ago. The mechanic at the KTM shop in Moncton did as you said and tugged on a link off the rear sprocket. He said he'd bet his last beer that the chain was the cause of the jerkiness. The sprockets show no sign of wear, and the chain is relatively new.

I'm going to order a new chain and sprockets and chain them after we ship the bike to Iceland. Hopefully I can still safely get some miles out of my current chain if it is the cause of the jerkiness. I'm also changing fuel filters when we get to Vermont. I have two sets there awaiting for me at my friends place.

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