Judder on Take off

[Hillwalker]

Bought my 650gt new in April this year (new Model) and really enjoying it although only done a couple of thousand miles, my problem is just recently it as started to judder on take off, but the puzzling thing is it only does it when the engine is cold, once warmed up properly its fine, anyone any idea's ? not knowing too much about how the CVT transmission works I wondered if the dealer at the first service had put either too much oil in or too thick an oil which when the engine as warmed the oil thins allowing the transmission to work properly. This was the first c650 this dealer had sold so when I speak to them I'm sure they won't have a clue.

 

[davidh]

Bought my 650gt new in April this year (new Model) and really enjoying it although only done a couple of thousand miles, my problem is just recently it as started to judder on take off, but the puzzling thing is it only does it when the engine is cold, once warmed up properly its fine, anyone any idea's ? not knowing too much about how the CVT transmission works I wondered if the dealer at the first service had put either too much oil in or too thick an oil which when the engine as warmed the oil thins allowing the transmission to work properly. This was the first c650 this dealer had sold so when I speak to them I'm sure they won't have a clue.

Sounds like clutch shudder and not much you can do about it. The CTV (including clutch) is a dry system so oil temperature isn't a factor there. I'd ask the dealer about it just to make sure. It would also be helpful if you could have someone else with a C600/C650 ride it to see if it feels like theirs. The two things I don't care for with my 2013 C650 are the idle (sounds like a tractor) and slow clutch response/shudder at take-off from a stop.

 

[Hillwalker]

The slow clutch response is one of the improvements on the 2016 model, I've no complaints with the take off speed, just the shuddering

 

[exavid]

Might be a slightly glazed clutch. Pretty common on Silverwings which operate much the same. When it does that, try holding the brakes and running up the engine speed a couple of times. Usually one or two short (four or five) second stationary run ups will clean it up if that's the problem. One thing that does tend to glaze the clutch on these kind of systems is making fairly slow starts from a stop. That will slip the clutch and heat it up much more than giving the throttle a good twist to lock up the clutch which doesn't polish the pads.

 

[Hillwalker]

Thanks exavid I will certainly try that, I do tend to do fairly leisurely starts as I thought I was being kind to the transmission. The dealer told me at the launch of the new model some of the journo's were holding the front brake on and winding open the throttle to smoke the back tyre, crazy !!! perhaps I ought to try that as a cure.

 

[exavid]

Smoking the tire will only sell tires. Just be a bit more forceful on launches. It won't damage the belt or clutch but it will reduce slippage which is what polishes the clutch pads and makes them judder. You want to get 'er moving, opening the throttle a bit more on take off will lock up the clutch faster, reduce slippage and won't make any difference to the CVT belt because it's always under tension and in it's lowest "gear" when the bike starts out.