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Author Topic: Clutch Not Holding Under WOT  (Read 244 times)

High On Octane

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Clutch Not Holding Under WOT
« on: August 18, 2013, 10:17:30 AM »
The Blackhawk is running great!  I'm pretty sure the last problem I had was due to the loose wire on the coil ground.  But alas, another problem arises.  Friday and Saturday night I was out hot rodding around town, and while the bike ran like a beast I was having trouble getting the clutch to hook up under 3/4-Full throttle.  The bike was pulling so hard that the clutch would slip until almost 5000RPMs.  I know people have reported issues with this before, it sounds like these clutches are known for having weak basket springs.  When I had it all apart a couple months ago doing the alternator/rotor the clutch plates still had plenty of material left and I'm thinking that there still is life on them now.  I'm thinking my problem is from when the return oil pump got clogged and dumped all the crankcase oil into the primary.  I have a feeling that the friction modifiers in the engine oil has left a coating on the clutch plates.  Any recommendations on how to clean them up WITHOUT pulling the primary cover?   ???   I've had that damn thing off to many times and am in no mood to pull it again unless I have to.  Thanks.

Scottie


The Blackhawk
1958 RE/Indian Trailblazer 711cc

classicrider

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Re: Clutch Not Holding Under WOT
« Reply #1 on: August 18, 2013, 10:48:47 PM »
Scottie,i remember years ago using water based degreaser (pretty cheap and came in 4 liter container) in the primary(yes you will have too break the seal on the primary but at least won't have to remove it),i just poured a good litre in there and went for a slow ride around the block working the clutch a few times then dumped that and then use ATF F ,that can actually be a little too grippy for smooth takeoffs,but at least it works.
colin
« Last Edit: August 18, 2013, 10:53:03 PM by classicrider »

High On Octane

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Re: Clutch Not Holding Under WOT
« Reply #2 on: August 20, 2013, 07:56:52 AM »
Changed out the oil to Type F ATF.  It's slipping less and seems to fully engage sooner than it was but definitely still slipping some.  Hopefully after a few more miles it will settle in.

Scottie


The Blackhawk
1958 RE/Indian Trailblazer 711cc

Ice

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Re: Clutch Not Holding Under WOT
« Reply #3 on: August 20, 2013, 09:38:04 PM »
 My spydy sense tells me friction modifiers are not the root cause of the slippage.

Just a hunch.
I can break it better,,,,at night, in the rain, on the trail,, 20 miles from nowhere.

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"TIMEX", the '06 Iron Barrel Military...it takes me everywhere I want to go... and some places I shouldn't.

High On Octane

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Re: Clutch Not Holding Under WOT
« Reply #4 on: August 20, 2013, 09:47:37 PM »
Me too.  Shitty springs?  Are stiffer springs available?

I actually just took the Blackhawk to get a beer and it's weird.  I can tell the clutch is slipping but the bike is freaking screaming and even with the clutch slipping it feels like it's accelerating faster than before.  It's running AWESOME right now!  If I can get that clutch to hook up I could lay a nice 1/4 mile time down.  :D

Scottie


The Blackhawk
1958 RE/Indian Trailblazer 711cc

High On Octane

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Re: Clutch Not Holding Under WOT
« Reply #5 on: August 20, 2013, 10:17:37 PM »
NEXT STOP, Old Chicago!  Clutch isn't slipping at all at less than 2/3 throttle, only when I'm in it to win it.

Scottie


The Blackhawk
1958 RE/Indian Trailblazer 711cc

High On Octane

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Re: Clutch Not Holding Under WOT
« Reply #6 on: August 21, 2013, 08:54:49 AM »
Okie Dokie.  The Blackhawk is my hot rod, and all though I smoked a chick in a new Mustang Friday night, I need to address this clutch issue.  The bike is clearly producing more power than this clutch was originally intended to handle.  Hitchcock's has SEVERAL options for improving the clutch.  I'd really like to upgrade to the belt drive setup, but my wife would cuts my balls off and feed them to me if I spend another $700 on my bike for a single part.    :P

I'm thinking of doing the Clutch Service Kit (Improved) - 7th listing from the top Part# 90222
And possibly the Pressure Plate Kit - 10th listing from the top part# 90043

http://www.hitchcocksmotorcycles.com/accessory-gearbox-clutch-primarydrive

Thoughts/Input?   ???

Scottie


The Blackhawk
1958 RE/Indian Trailblazer 711cc

D the D

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Re: Clutch Not Holding Under WOT
« Reply #7 on: August 21, 2013, 09:05:07 AM »
I wish they said who made the plates.  They list some that are EBC and Sureflex which guarantees the quality.
Check the warranty and recommendations for whatever you get 'cause EBC used to state that running ATF in the primary voided their warranty.
'07 Iron Barrel Military (Deceased 14 September, 2013)
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