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Old 06-25-2012, 11:58 AM   #1
jrspm
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Destroyer cluth hub need help

Has anyone had problems with the destroyer clutch hub cracking? For some reason I have been breaking clutch hubs every time I go racing. They crack along the large snap ring groove. I am thinking of welding around the groove to help support the hub. I have tried different clutches, packed clutch at different thicknesses and it still cracks. Everything else, including the V&H clutch basket and transmission shaft are fine. I wanted to go to Tulsa, but without getting clutch hub problem fixed it would be a waste of time. Any help would be appreciated.

Thanks,
John
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Old 06-25-2012, 08:15 PM   #2
grandpawgriz
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?????

How many times has this happened? What is your clutch set up? Are you using Barnett stuff??
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Old 06-26-2012, 08:26 AM   #3
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It has happened four times, two times in two races. I use six washers on the arms the middle static spring with a .050 shim and harley clutch plates, have also used energy one plates.
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Old 06-27-2012, 11:27 AM   #4
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How long have you been running the V@H clutch basket? Also, what was the last thing/ adjustment you made to the clutch before this problem started or did the problem start after a brand new set of plates were installed?
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Old 06-27-2012, 01:10 PM   #5
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I have always had the V&H basket and used the same set up only this year I have a new motor and have gained 20LBS. Ray Vreeland told me I should use a heaver static spring.I am going to try that this weekend at my local track.
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Old 06-27-2012, 08:20 PM   #6
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Quote:
Originally Posted by jrspm View Post
I wanted to go to Tulsa, but without getting clutch hub problem fixed it would be a waste of time. Any help would be appreciated.

Thanks,
John
You're probably aware, but TULSA was canceled this week do to bad heat conditions.

Have you ensured proper alignment of the pressure plate and hub?
It's easy to think that they will fit in any of the five positions, but in reality they only fit up correctly in one position.

I have not noticed any cracking yet, but I recall reading some ancient threads on the topic
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Old 06-28-2012, 11:29 AM   #7
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Correct me if I'm wrong but if you weigh more wouldn't you want to lower your static spring pressure? Allowing the clutch to slip a little more to get you out of the hole without bogging. This has been the base of my problem the entire season so far. Went with medium (heavy duty) springs and bogged, then went with the lightest springs(medium duty) plus .150 of shim under each one and started bouncing of the limiter almost instantly.
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Old 06-28-2012, 11:45 AM   #8
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bogging

Quote:
Originally Posted by clint6776 View Post
Correct me if I'm wrong but if you weigh more wouldn't you want to lower your static spring pressure? Allowing the clutch to slip a little more to get you out of the hole without bogging. This has been the base of my problem the entire season so far. Went with medium (heavy duty) springs and bogged, then went with the lightest springs(medium duty) plus .150 of shim under each one and started bouncing of the limiter almost instantly.


I weigh 300lbs in leather, 850 on the scales after a pass. I got the red springs in with no shims and leave at 7500 to 8000 with no bog on stock gearing. We are in the process of changing the gearing to get a little better 60' and to be farther into 5th in the traps. The taller MT or Goodyear is messing with my plans
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2011 AHDRA Sportsman Rookie of the year
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Power by Vreeland's Harley-Davidson
http://vreelandsharley.com/?page_id=543

Best 60' 1.438
Best 1/8th 6.181 @ 111.37 MPH
Best 1/4 9.783 @ 136.10 MPH
855 LBS at the starting line
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Old 06-28-2012, 11:45 AM   #9
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You're on the correct principal, but also look at final drive ratio, going lower on the front sprocket and or higher on the rear will also help

Sent from my droid
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Old 06-28-2012, 12:55 PM   #10
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To start, I didn't mean to take away from this mans thread. I wish him well with finding his problem.

Now I am totally lost. I way 240 with leathers and helmet. LOL what a nightmare this has become. Try try try again!

So you think I'm going the wrong way with my rear sprocket? Should have went up with the # of teeth?
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Old 06-28-2012, 12:59 PM   #11
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Going lower on the front gets you out of the hole faster but you'll have to do something to keep you from running out of gear at the big end.
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Old 06-28-2012, 03:50 PM   #12
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Quote:
Originally Posted by clint6776 View Post
Correct me if I'm wrong but if you weigh more wouldn't you want to lower your static spring pressure? Allowing the clutch to slip a little more to get you out of the hole without bogging. This has been the base of my problem the entire season so far. Went with medium (heavy duty) springs and bogged, then went with the lightest springs(medium duty) plus .150 of shim under each one and started bouncing of the limiter almost instantly.
I was told @230 lbs. I need the red springs,four washers on arms and adjust leaving with tire pressure.
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Old 06-28-2012, 04:44 PM   #13
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Quote:
Originally Posted by grandpawgriz View Post
I weigh 300lbs in leather, 850 on the scales after a pass. I got the red springs in with no shims and leave at 7500 to 8000 with no bog on stock gearing. We are in the process of changing the gearing to get a little better 60' and to be farther into 5th in the traps. The taller MT or Goodyear is messing with my plans
Sometimes I think the variable, is the power the engine is producing, yours has been graced by the hands of Ray Vreeland, I'll bet that baby is ticking & kicking wonderfuly.

I do not think I have the best tune, so I am still working around the Tire & gearing factors. I was thinking of putting the ROBS DYNO tune back in my ECM, I know his tune helped me last fall!
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Old 06-29-2012, 05:34 AM   #14
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Have yet to even put mine on the dyno. Just another expense I can't afford at the moment. Bike seems to be running pretty fat right now and has a hard time idling which I am sure is a part of my problem. For now I will stick with gearing changes.
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Old 06-29-2012, 05:43 AM   #15
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Also, with the M/T, I have enough gear to go way past the trap. I think I will try a tooth less on the front sprocket. Thanks for the tips gang. For some reason I was thinking the opposite but now it makes sense. Rookie mistake, hehe!
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