Just trying to understand the meaning of the original post. I definitely don't contribute to any carbon build up on mine.
I too think
that particular info is a carry-over that was originally intended to be only about the V-Twin motors, which are high revving motors, and their Centrifugal clutches, that has somehow erroneously ended up being included in the info about the 1330's with their engine oil pressure based hydraulic clutches. Or maybe it originally included the correct revs for the 1330 motors, only to be changed at some stage to match the V-twin rev requirements, possibly because too many people were getting them mixed up - we've seen that here on the Forum often!
But despite the fact that the clutch on a 1330 SE6 isn't going to slip like that, the point Ron made about the engine and carbon build up is important!

You can see from the comparison graph that
@JayBros posted above, that the 1330's are delivering substantial torque from right off idle, climbing rapidly to about 2500 rpm, flattening out there until just under 4000 rpm, before climbing rapidly again to a peak at about 4500 rpm, then slowly declining but still continuing in very usable levels right out to 7500 rpm or so - and because of its nature, the 1330 clutch is basically 'locked' all the while that there's engine oil pressure, so it won't slip, and because of the TCM control, neither will it stall out the engine, even if the engine is riding the ragged edge of lugging &/or pinging! And it's that last 'even if' bit which has always been at least partly responsible for causing the sort of carbon build up Ron is reporting seeing more of!
We're seeing it more & more here in Oz, too - those riders who don't keep the revs up on the 1330 SE6's and maybe never push their Spyders into their upper rev range occasionally are finding that they're slowly choking their Spyder's performance, especially those who keep their revs low but run as quickly up thru the gears as the TCM will allow, basically as soon as they start rolling, and then pretty much stay in the highest gear they can hold for whatever speed, using the throttle juuust enough to deliver the torque they need to do whatever they want to without quite triggering the TCM to initiate that 'fail-safe' down-shift!! The loss of performance due to excessive carbon build up might be slow & almost imperceptible, but it's demonstrably there; and like Ron suggests, it isn't (usually) due to excessive clutch wear &/or slip either! When we go looking here, we're also seeing more choked engines than we are clutch issues...
That's a good thing tho, cos once the operator realises they're the cause of this carbon build up, if they realise and get onto it soon enough, they can pretty much reverse the early stages simply by wringing the throttle a bit harder and going for a 'more spirited ride' every now and then, saaay, once a month or so. Sure, the 1330 engine has scads of torque right off idle, altho it
is an inherently lazy motor, and you can easily baby it way too much cos it'll just do it! But if you make the effort to get everything nice and hot and explore the upper limits of the rev range every now and then, it will cook off and blow all the carbon and the cobwebs out - of
you AND the Spyder!!
Just Sayin'
