Clutch booster unit

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sam46
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Clutch booster unit

Postby sam46 » Fri May 04, 2018 7:24 pm

Well ive figured out why my clutch is rattling on idle....
Whilst stripping it down there was slight play in the clutch unit from the needle roller bearing. £39 for a bearing is bad enough, but then I had a good look at the rest of the clutch unit and found quite a bit of wear on the booster unit faces which would explain the metallic like tappet sound that goes when clutch is pulled.
I also found the oil jet was pretty gummed up, which I'm guessing hasn't help with the bearing and booster wear.

Anyway does anyone have a new booster unit or good condition used one for sale?

Cheers
07 SD 990 - Akros - Awaiting major mods
05 SD 990 - RamAir pods - Akro Ti - Sold
07 SD 990 - Superduke heaven RIP
KTM 250SXF, KTM 300EXC, KTM 450SMR, CRF450, KTM 250XCF, YZF R1 09, YZF R1 03, YZF R6 02, YZF R1 98

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Aphex
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Re: Clutch booster unit

Postby Aphex » Fri May 04, 2018 10:58 pm

Does it sound like this?

08 SD, Mivv Suono, Rottweiler airbox. Current map: One some guy sent me from the internet.

Me so Hoony.

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sam46
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Re: Clutch booster unit

Postby sam46 » Sat May 05, 2018 7:34 am

Not quite as bad as that.
I first thought shims need doing but it completely went as soon as clutch it applied.
There is about 3mm play in the booster unit and after watching a few vids of new ones, there is very little if any free play.
Gonna pop to ktm shop and grab new needle bearing and give that a go Monday with the oil jet now unblocked but I'm pretty sure it's that booster unit.
07 SD 990 - Akros - Awaiting major mods
05 SD 990 - RamAir pods - Akro Ti - Sold
07 SD 990 - Superduke heaven RIP
KTM 250SXF, KTM 300EXC, KTM 450SMR, CRF450, KTM 250XCF, YZF R1 09, YZF R1 03, YZF R6 02, YZF R1 98

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No. 47
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Re: Clutch booster unit

Postby No. 47 » Sat May 05, 2018 8:34 am

Not sure I understand what you mean by booster unit - I think that I have a circa 2k miles complete OE clutch assembly somewhere - should I dig it out?
'08 ex-Battle race KTM Superduke 990 R No.47
'08 OE KTM Superduke 990 R
'01 Ducati 996S

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Adrock990r
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Re: Clutch booster unit

Postby Adrock990r » Sat May 05, 2018 9:04 am

Image

The circled bits are the Clutch Booster Unit. $412 if you were to buy one in Australia...

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Adrock990r
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Re: Clutch booster unit

Postby Adrock990r » Sat May 05, 2018 9:07 am

Aphex wrote:Does it sound like this?



Wow dude that makes mine sound relatively normal compared to yours Aphex..! I think it's the black KTM clutch cover amplifying the sound though, you should remove it and send it to me straight away :D

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sam46
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Re: Clutch booster unit

Postby sam46 » Sat May 05, 2018 9:23 am

Yep that's the part.
Just had a brainwave..... I was looking at a suter slipper clutch kit. I'm presuming this will replace the basket and booster unit!? And if I'm spending £230 to replace booster I may aswell put that towards a slipper...
07 SD 990 - Akros - Awaiting major mods
05 SD 990 - RamAir pods - Akro Ti - Sold
07 SD 990 - Superduke heaven RIP
KTM 250SXF, KTM 300EXC, KTM 450SMR, CRF450, KTM 250XCF, YZF R1 09, YZF R1 03, YZF R6 02, YZF R1 98

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Aphex
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Re: Clutch booster unit

Postby Aphex » Mon May 07, 2018 2:41 pm

sam46 wrote:Not quite as bad as that.
I first thought shims need doing but it completely went as soon as clutch it applied.
There is about 3mm play in the booster unit and after watching a few vids of new ones, there is very little if any free play.
Gonna pop to ktm shop and grab new needle bearing and give that a go Monday with the oil jet now unblocked but I'm pretty sure it's that booster unit.


While you have it apart check if there is any play in the basket. I've read about the booster going out on the ADV forums but nothing like that here.

This is what the free play will look like with the basket still mounted:



If that's happening then your rivets have pulled out of the primary gear:

08 SD, Mivv Suono, Rottweiler airbox. Current map: One some guy sent me from the internet.

Me so Hoony.

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Aphex
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Re: Clutch booster unit

Postby Aphex » Mon May 07, 2018 2:45 pm

Adrock990r wrote:
Wow dude that makes mine sound relatively normal compared to yours Aphex..! I think it's the black KTM clutch cover amplifying the sound though, you should remove it and send it to me straight away :D


If there's enough demand I might look into machining a batch 8)

I can't seem to find that thread where some one was asking what parts we want made for the Dukes but that would be a good one to add to it!
08 SD, Mivv Suono, Rottweiler airbox. Current map: One some guy sent me from the internet.

Me so Hoony.

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05DUKE
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Re: Clutch booster unit

Postby 05DUKE » Tue May 08, 2018 6:37 am



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