New CCT...motor seems slightly "off"

[Eric R]

Just had a new CCT put in my '13 Tenere under warranty. Call me crazy...but it seems like it runs a little "off" now. I've had my ECU flashed so I know what it should feel like when I whack the throttle, but now it's just not like it was. It idles smooth, but doesn't seem to have the power it did have in either mode "T" or "S" . Could the new CCT be a bit "off"??? Thoughts? I have a Graves manual CCT but since I was getting a new CCT for free I didn't install it. I have heard that of guys have issues with a new CCT, just wondering if this is what I am experiencing.

 

[WJBertrand]

The new CCT would not affect performance at all, it’s possible they got one of the cams off a tooth and that error in valve timing would have a big impact on performance.


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[Cycledude]

Very sorry to hear it’s not running right, hopefully whoever installed the new CCT will be willing to fix it for you free of anymore charges.

 

[Don in Lodi]

A mistake was made. Easy to do. Very time consuming to fix.

 

[Checkswrecks]

As Bertrand wrote, we've had a number of owners install a CCT and have the chain slip a single tooth on a cam. As Don wrote, it's easy to do because the valve springs want to make the cams move apart when the chain is not tight.

Don't whack the throttle till you know the cams are right, lest a valve whacks a piston.

 

[Eric R]

thanks guys....will have to call the dealer....they've been nothing but great to deal with in the past, so I don't see any reason for that to change now. Maybe its me, but it's ever so slight that I can't ignore it. It doesn't rev as it used to along with a slight loss in power. I'll see what transpires with the dealer. Thanks for all the insight!

 

[steve68steve]

I've wondered what the effect of an over-tightened manual CCT would be.

More sliding friction to overcome between the chain and guide - A few MPG? Slightly less power?

...or is it practically impossible to get it too tight?

 

[jrusell]

Re-read his post. He did not install a manual tensioner. Upgraded tensioner installed under warranty. No adjustment possible.

 

[Don in Lodi]

An over tightened adjuster will whine. BTDT.

 

[Squibb]

Did the techs touch/service anything else on the bike when the CCT was changed?

Could they have flashed an updated Yamaha map onto your ECU.

 

[Eric R]

Not that i know of...just put in new CCT. Better not have flashed my ECU since Anthony already did mine a few years back...lol

 

[EricV]

Could they have flashed an updated Yamaha map onto your ECU.

Yamaha dealers don't do updated maps. No manufacturer should ever need to update a ECU map. If they do, they are selling untested maps to get bikes out the door.

 

[gv550]

I replaced my CCT a few weeks ago and even though I zip tied the chain to both cam sprockets it still jumped a tooth at the intake. Obviously I didn't pull the tie tight enough but it sure does jump a tooth easily.

 

[WJBertrand]

Could they have flashed an updated Yamaha map onto your ECU.

That would a really strange thing for the dealer to do, what makes you think they would? There’s been no updates, TSBs or recalls from Yamaha in this regard.


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[Squibb]

Yamaha dealers don't do updated maps. No manufacturer should ever need to update a ECU map. If they do, they are selling untested maps to get bikes out the door.

That would a really strange thing for the dealer to do, what makes you think they would? There’s been no updates, TSBs or recalls from Yamaha in this regard.

Well guys, maybe not in the US. Perhaps your Fed Laws preclude this without an official recall, particularly post VW diesel-gate.

Commonplace elsewhere. My KTMs were always flashed a new map at service, whenever an update was available from the manufacturer. My KLV1000 (aka V-Strom) was reflashed at my request by the Suzuki dealer to an alternative map to remove bottom end lean running in EU guise, described as a 'Suzuki V-Strom rest of the world map'. I hear similar stories from BMW owners too, anxious to protect non-manufacturer ECU reflashes when serviced by the dealer. I have no specific knowledge of Yamaha practice, but I will check at next service.

Anyway it was just a thought - discount it if you think it impossible in your jurisdiction.

 

[EricV]

@Squibb - <gigggle> You bought KTMs? Bikes soooo bad that they leave the factory needing repairs before they even get to the owners.

KTM does firmware 'upgrades' in the US. Most US dealers will not even consider doing a ECU flash due to emissions and other US laws. They don't want to be liable for the work. I've very surprised that Suzuki would do this in the UK, considering the even more restrictive laws there in regards to MOT and Euro 1 thru 6 standards.

 

[Checkswrecks]

I agree that most US dealers won't look at the ECU without cause or flash it. HOWEVER, I also know of a couple of conscientious dealers who will check the ECU for fault codes that could lead to a little more billable maintenance work. I could see this lead to re-installation of an original Yamaha flash without the owner knowing.

 

[EricV]

I agree that most US dealers won't look at the ECU without cause or flash it. HOWEVER, I also know of a couple of conscientious dealers who will check the ECU for fault codes that could lead to a little more billable maintenance work. I could see this lead to re-installation of an original Yamaha flash without the owner knowing.

Anything is possible, but I really don't think the flash interferes with reading codes, and greatly suspect that most Yamaha dealers lack the ability to re-install the original OEM flash.

 

[cyclemike4]

this has nothing to do with the Yamaha doing a flash without you knowing about it but it happened to my buddy with Polaris. Of course this is apples and orange's but he took a new Polaris Razor in for service of some sort and they reflashed his ECU. the next weekend we were out riding and it would not go into four wheel drive. He had to take it back and have it flashed again.

 

[Jlq1969]

I think it's more a bad technique in changing the CCT, like said WJB and the coincidence that an intake valve was closed and the camshaft rotated, like said CHKSWRCKS. A delay in admission = decompression, a delay in the exhaust = break