V7II Cush Drive |
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jefrs
Senior Member Joined: 12 Aug 2018 Location: West Berkshire Status: Offline Points: 333 |
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Posted: 29 Sep 2018 at 23:57 |
How much play should one expect on the cush dive of a 2015 V7II? With the bike in gear on the centre stand (or jack), how far should the wheel rotate back and forth loosely before it encounters resistance? Is the cush drive in the wheel hub? How easy is it to replace the rubbers?
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Brian UK
Moderator Group Joined: 13 May 2014 Location: Surrey Status: Offline Points: 17641 |
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There should be no play in the cush drive, the rubber inserts should hold the wheel without movement. If you have the wheel off the ground and are turning it back anf forth, you will get movement which is backlash in the gearbox. It's highly unlikely that the cush drive will give problems unless it's been assembled incorrectly. Take the wheel out and you will see all.
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Brian.
Better 5 minutes late in this world than years early in the next. |
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Andyb
Senior Member Joined: 02 Jul 2016 Location: Nottinghamshire Status: Offline Points: 602 |
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The cush drive rubbers are individual pieces of rubber that go in the hub of the wheel, behind the bevel. As Brian has said, remove the rear wheel and as you will see them.
I can’t imagine they could be assembled wrong, there is no room in the hub. My V7 is not in front of me but I would guess 5mm of rotation at the tyre is normal backlash as it is a summation of play in bevel / splines / UJs between wheel and gearbox. Andyb |
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jefrs
Senior Member Joined: 12 Aug 2018 Location: West Berkshire Status: Offline Points: 333 |
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I'm getting a lot of rotation of the wheel up on the centre stand before the slack is taken up and resistance is felt. Maybe 4 to 6-inches at the tyre. I'm not sure how much is backlash and how much is cush; certainly more than 5mm. The gearbox and drive is behaving normally, no issues there. Do I assume the rubbers are shot? But having just done the rubbers on the Enfield, similar age and mileage, it was the rubbers and made one hell of an improvement. Yes, the rubbers do wear out. Getting the wheel out of the Guzzi will be a little bit more complicated
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Brian UK
Moderator Group Joined: 13 May 2014 Location: Surrey Status: Offline Points: 17641 |
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No, they all do that sir. That's the backlash in the transmission as a whole but mainly in the gearbox. Andyb, by assembled wrong I really meant assembled with some missing. Whatever you do, do not ever run the engine on the centre stand, in gear. The noise will scare you to death.
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Brian.
Better 5 minutes late in this world than years early in the next. |
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Mike H
Senior Member Joined: 21 May 2014 Location: East Anglia Status: Offline Points: 8733 |
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+1 Don't know about new V7's but on the old Tonti's you also had to add on the play of 4 splined joints. |
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"Chicken nuggets don't dance on a Tuesday."
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V7Chris
Senior Member Joined: 13 May 2017 Location: Powys Status: Offline Points: 1882 |
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What, more than sitting at the Traffic lights between two panel vans with the clutch out you mean! Wow that must be scary. I looked around to see where the concrete mixer had stopped......
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Brian UK
Moderator Group Joined: 13 May 2014 Location: Surrey Status: Offline Points: 17641 |
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It's not the clutch noise, it's the transmission rattling with the uneven beat of a v twin.
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Brian.
Better 5 minutes late in this world than years early in the next. |
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jefrs
Senior Member Joined: 12 Aug 2018 Location: West Berkshire Status: Offline Points: 333 |
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I don't think it can all be free play in the gearbox because of the way it makes slow cornering jerky going on and off the throttle. The movement is very free with no sound of the shaft turning, then resistance is felt and then I feel the backlash of which you speak. The movement is a short hand-span. |
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Brian UK
Moderator Group Joined: 13 May 2014 Location: Surrey Status: Offline Points: 17641 |
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The jerky throttle is also a known issue and is generally considered to be a fuelling issue. Take the wheel out and look for yourself. You will see the rubbers and the vanes which go between them so will easily be able to tell if there is any play there.
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Brian.
Better 5 minutes late in this world than years early in the next. |
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jefrs
Senior Member Joined: 12 Aug 2018 Location: West Berkshire Status: Offline Points: 333 |
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A jerky throttle is a feature on most electronic fuel injection. An example of the symptom I'm on about might be taking a mini-roundabout where you have to move forward, slow to negotiate the hump and accelerate gently away, slowly because you're in traffic. This can be done by keeping some power on and dragging the rear brake, with the clutch slipped. When I replaced the cush rubber on the Enfield the kick up the bum as the brake comes off went away, everything is now smooth taking slow turns. Beforehand the Enfield had only a couple of inches of play, less then the Guzzi has now, but if anything the Enfield torque is even lower down, it will walk away at idle, needing gentle use of the throttle for slow speed. On the Guzzi the power come up without a massive flat spot, decelerating into the turn and then accelerating gently out is producing a pretty big kick up the bum as the force on the drive reverses direction. To use the rear brake to take up the slack, the Guzzi needs more throttle kept on. This needs a fair amount of brake and with the clutch slipped the engine is racing. I also want to change the foam in the air box breather (full of oil, needs cleaning), which needs the wheel out. This is turning into a fairly major job.
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Mike H
Senior Member Joined: 21 May 2014 Location: East Anglia Status: Offline Points: 8733 |
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Yes so it was also on my Tonti bikes. |
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"Chicken nuggets don't dance on a Tuesday."
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Mike H
Senior Member Joined: 21 May 2014 Location: East Anglia Status: Offline Points: 8733 |
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"On the Guzzi the power come up without a massive flat spot, decelerating into the turn and then accelerating gently out is producing a pretty big kick up the bum as the force on the drive reverses direction. To use the rear brake to take up the slack, the Guzzi needs more throttle kept on. This needs a fair amount of brake and with the clutch slipped the engine is racing."
Yes sounds familiar. I hated having to do small roundabouts. |
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"Chicken nuggets don't dance on a Tuesday."
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Brian UK
Moderator Group Joined: 13 May 2014 Location: Surrey Status: Offline Points: 17641 |
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I know this might sound odd, but how much slack do you have in the throttle cable? Many, including myself, have found that reducing this slack to the absolute minimum does reduce that snachiness you describe. You just need to be sure that turning the steering from lock to lock has no effect on the tickover speed.
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Brian.
Better 5 minutes late in this world than years early in the next. |
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Mike H
Senior Member Joined: 21 May 2014 Location: East Anglia Status: Offline Points: 8733 |
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+1, I've had to do this.
Try roundabouts on a maxi scooter with automatic clutch and CVT and too much throttle play Know all about throttle snatch then |
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"Chicken nuggets don't dance on a Tuesday."
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