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Author Topic: Lightened flywheels group buy  (Read 16954 times)
Monsterlover
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« on: November 07, 2013, 08:07:12 AM »
I've been contacted by a DMFer who wants me to lighten up his flywheel.

I need 4 more of you who want the same before I can do it.

$70 which includes return shipping anywhere in the states.  Removes about 2 pounds*.

PM Herm if you want a reference.  I did his a while back and I think he even has pics posted somewhere.


*from an i.e. flywheel (fuel injected)
Looks like I can also do the carb flywheels but I can't guarantee 2 pounds since we cant cut the area with the ignition trigger.
« Last Edit: November 19, 2013, 10:17:42 AM by Monsterlover » Logged
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« Reply #1 on: November 07, 2013, 08:11:54 AM »
Any flavor Duc flywheel?
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« Reply #2 on: November 07, 2013, 10:13:45 AM »
Very interested. Do you have a cutoff date in mind?
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« Reply #3 on: November 07, 2013, 12:31:37 PM »
I'm in.


Found the picture.
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Monsterlover
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« Reply #4 on: November 07, 2013, 12:39:36 PM »
Quote from: Speeddog on November 07, 2013, 08:11:54 AM
Any flavor Duc flywheel?

How many different ones are there?

I think all the ie bikes have the same fw. Does the Carb fw differ? 

We chuck on that bearing bore so as long as that's the same its a non issue here.
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"The Vincent was like a bullet that went straight; the Ducati is like the magic bullet in Dallas that went sideways and hit JFK and the Governor of Texas at the same time."--HST    **"A man who works with his hands is a laborer.  A man who works with his hands and his brain is a craftsman.  A man who works with his hands, brains, and heart is an artist."  -Louis Nizer**
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« Reply #5 on: November 07, 2013, 01:29:34 PM »
Quote from: Monsterlover on November 07, 2013, 12:39:36 PM
How many different ones are there?

I think all the ie bikes have the same fw. Does the Carb fw differ? 

We chuck on that bearing bore so as long as that's the same its a non issue here.

Myself, I've got 3-ph carbie and 3-ph ie on my bench now, they are different.

Nichols says there's 6 flywheels.

98 and earlier carbie
99 and later carbie
99 and later ie
90-95 ie
96-98 ie
S4Rs & 99-01 SPS, 749 R

I didn't plow through each model entry on their site, so YMMV.

AFAIK, they all use the same sprag bearing, so if that's the surface you chuck up on, then it should be good.

Just don't cut the carbie ignition trigger lumps off.  Grin
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Monsterlover
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« Reply #6 on: November 07, 2013, 04:16:31 PM »
Got a pic of those trigger lumps?
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« Reply #7 on: November 07, 2013, 05:08:17 PM »
Quote from: Monsterlover on November 07, 2013, 04:16:31 PM
Got a pic of those trigger lumps?

Stock lump, 3 phase carbie:




Modified lump, 3 phase carbie, other side view:
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« Reply #8 on: November 07, 2013, 06:42:20 PM »
I do not have a good feeling about these carb flywheels.

That trigger lump is definitely in the area we machine.
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« Reply #9 on: November 07, 2013, 07:46:50 PM »
<control+C>
<control+V>
Edit...type type type...
<save as>

yes?  Grin

Before:


After:


Thought I had a better pic of the 'after'...
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Monsterlover
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« Reply #10 on: November 07, 2013, 07:55:02 PM »
Hmm. I could do it but I can't say how much weight comes off without doing one and weighing it.
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« Reply #11 on: November 19, 2013, 11:16:32 AM »
Monsterlover, I'm the guy you just e-mailed back about this. Sorry, I didn't know this thread was going on. We can keep further conversation here for everyone's benefit.

I also have a carbed model, still interested though.

Speeddog, did you basically just drill that row of holes in a mill? Then take material off with a lathe just above the row of holes?
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« Reply #12 on: November 19, 2013, 12:07:58 PM »
Quote from: ChrisK on November 19, 2013, 11:16:32 AM
~~~SNIP~~~.

Speeddog, did you basically just drill that row of holes in a mill? Then take material off with a lathe just above the row of holes?

I had a bunch of weld added to that timing lump so I could run any advance I wanted (using an IgniTech TCIP-4 ignition box).
Machined that lump down, and then removed material from there back.

Additional drilled spots were to restore balance after adding material and removing ~ half of the original balance drilling.
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« Reply #13 on: November 19, 2013, 01:44:57 PM »
Does the stock 'lump' limit the amount of advance you can use, therefore limiting available performance with a heavily modded bike?

How did you "measure balance"?

I'm sorry, I feel like I'm taking this thread off topic.
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« Reply #14 on: November 19, 2013, 02:30:34 PM »
My carbed flywheel has over 2 pounds machined off. A mate trimmed the back, inside, etc with a bevel effect and kind of dished it out alot like the Nichols version.
Sorry, no pics. It went from 1900 grams to 900 grams. Another mate reckons its smoother than the Yoyodyne/DP type on his carbed 900 SS.
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