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Flywheel Lightening

Old 08-18-2017, 11:54 AM
  #151  
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Originally Posted by skokievtr View Post
How low can you go
I think Im there at 4lb 6oz

Originally Posted by skokievtr View Post
My question is Erik, after reading how you barely discern a difference with sub 6 and even 5 pound flywheels
Did I say that?
BETWEEN the two a sub 6lb and a 5lb, say 4~10 oz difference in that range perhaps not a lot of seat of the pants.
But between stock and 4lb 6oz
or between 6.x anything and 4lb 6oz yes I think you will "feel"
a difference if you were to try them back to back.

Originally Posted by skokievtr View Post
will I be able to feel an appreciable change? So before I install it should I have you trim it some more? ..
Up to you, but id say keep what you have and if you want another, do like we did before , buy in the US, ship direct, have it sent to you. Sell the one you do not want to keep.
|I think you'll get more return of $$ that way than shipping two ways and paying for the new cut.

Shoot me an email and we can figure it out.
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Old 08-30-2017, 03:34 PM
  #152  
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Erik can i ask on the basket side of things whats the smallest dia you have went to?
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Old 08-31-2017, 07:32 AM
  #153  
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Originally Posted by fabiostar View Post
Erik can i ask on the basket side of things whats the smallest dia you have went to?
135.5mm is the smallest diameter I have cut to.

I am not confident every flywheel out there is the same, as in they come from different vendors over the years, different runs for the manufactures supply chain, and while Im sure they all have a final spec to be made to, Ive seen enough variance in the ones I have cut to think there is some manufacturing differences in how the individual part maker got to that final spec.

So use caution and have a spare if you cut the basket OD smaller then 136mm

Attached Thumbnails Flywheel Lightening-mr-light-weight-vtr1000f-flywheel.jpg  
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Old 09-04-2017, 03:55 PM
  #154  
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Cheers Erik.. that is some material removed. i have a spare here to practice on myself and im gona run it on my yellow bikes engine to see what kinda results iv got.. still have to get tooled up mind you but it will give me something to play with over the winter..
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Old 11-29-2017, 04:26 PM
  #155  
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Target weight was "about 5 lb" as rider wanted a "not your lightest version" I weighed swarf as it came off the flywheel for a guesstimate on what i had removed and got close...
Finished weight is 4 lb 12 oz

This one drew blood .......... think of it as razor sharp confetti
Attached Thumbnails Flywheel Lightening-done-4-12.jpg   Flywheel Lightening-swarf.jpg  

Last edited by E.Marquez; 11-29-2017 at 04:37 PM.
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Old 11-30-2017, 08:13 AM
  #156  
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Yesterday I found an interesting and new issue..
I cut the basket of one yesterday to my standard 135mm diameter ..And found the area of the basket that is "stamped" actually caused the steel to fracture and once the deformed steel was cut away, the fracture reveled itself.

The fracture you see was visible at 138mm which is the diameter of the area on this one that is smooth and finished cut. After finding the fracture I did a rough cut to 133mm just to confirm it was a fracture and not just a scratch from dragging a tool across the surface. You can clearly see the fracture in that pic.

At first I thought I had cut too far and it was undersized..but no...the dia was 135.43 mm so almost 1/2mm above my general target..
This is the first time I have seen this issue and I cut two more last night to confirm it was not something "new" I was causing .

The next flywheel i cut at 139mm looked like this the deformed stamping is still just visible.


At 138mm its gone and you can just see a shadow of where it was


So just another item to inspect on a provided or bought flywheel that might make it junk for this MOD ...like the ones I get from ebay that were removed with a 3 jaw puller, or the key way / taper is damaged... flywheel has been dropped and the basket is deformed. 1 in 4 flywheels i look at on ebay are rejected for purchase because of these type of issues and I've been burned a few times still with what shows up.
So look well before you purchase and if your doing this MOD be on the look out when you cut it down for these fractures..... I found them at all stamping locations on that one flywheel..
Attached Thumbnails Flywheel Lightening-stamping.jpg  
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Old 12-02-2017, 05:03 AM
  #157  
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good advice Erik,,, i have went through the records of any i have done and as yourself im in around the 135 dia but so far no cracks, iv an old one here im gona cut down down and see when it gets to the point of failing and see how much meat is on the bone.. as you say they all seem to be slightly different weight/size wise..

something to look out for in future..
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Old 12-02-2017, 07:02 AM
  #158  
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I cut this one flywheel to the point of failure to re confirm basket material thickness. At 136mm Im absolutely unconcerned with cutting down to that point.

Theses fractures..there has been only ONE flywheel in all i have done that I found this issue, and the fractures were observable long before 136mm..
Bottom line, as long as your looking for them, you will see them as soon as you clear the last of the stamping from the basket. If not there, it's not an issue for that flywheel.....finish the cut as normal.

Originally Posted by fabiostar View Post
good advice Erik,,, i have went through the records of any i have done and as yourself im in around the 135 dia but so far no cracks, iv an old one here im gona cut down down and see when it gets to the point of failing and see how much meat is on the bone.. as you say they all seem to be slightly different weight/size wise..

something to look out for in future..
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Old 12-18-2017, 08:43 PM
  #159  
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Hey look, a light weight VTR flywheel

Starting at 7lb 7oz

Finishing at
4lb 9oz

Attached Thumbnails Flywheel Lightening-ross-flywheel-4_9.jpg   Flywheel Lightening-ross-flywheel-before.jpg  

Last edited by E.Marquez; 12-18-2017 at 08:51 PM.
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Old 12-18-2017, 10:48 PM
  #160  
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Originally Posted by E.Marquez View Post
PM Sent
hey erik send a pm on a price for lightening flywheel. Been doing research on your post seemed like a great mod
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Old 12-18-2017, 11:28 PM
  #161  
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Dollar for dollar, pound for pound, Erik's flywheel was the best (engine) performance mod I've done on my SH. 7k hard and fast miles and no problems.
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Old 12-19-2017, 06:21 AM
  #162  
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Originally Posted by Mvanriel60 View Post
hey erik send a pm on a price for lightening flywheel. Been doing research on your post seemed like a great mod
PM sent
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Old 12-21-2017, 10:24 AM
  #163  
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And my Christmas wish has been delivered (Actually that wish really was delivered, one of our pups needed surgery and she came though plus healing well..... )
But anyways .. have a source for balancing flywheels... or at least a commitment to give it a shot.. Im not convinced there is enough material remaining to insert balance weight, or remove same as needed. But the company has extensive experience in doing motor sport balancing to include turbo rotors spinning 30-40k RPM's

I cut one last night as a test and shipped it off today for their review and work.
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Old 12-21-2017, 11:42 AM
  #164  
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Originally Posted by E.Marquez View Post
And my Christmas wish has been delivered (Actually that wish really was delivered, one of our pups needed surgery and she came though plus healing well..... )
But anyways .. have a source for balancing flywheels... or at least a commitment to give it a shot.. Im not convinced there is enough material remaining to insert balance weight, or remove same as needed. But the company has extensive experience in doing motor sport balancing to include turbo rotors spinning 30-40k RPM's

I cut one last night as a test and shipped it off today for their review and work.
Interesting! I can't wait to see what they find out while balancing one.

Sorry to hear about your puppy dog. Glad she's doing okay.
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Old 01-09-2018, 09:23 PM
  #165  
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PM sent
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Old 01-10-2018, 07:13 AM
  #166  
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Originally Posted by skifreak View Post
PM sent
And replied
Thanks

Erik
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Old 01-20-2018, 03:25 PM
  #167  
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Was asked to do a Moriwaki cut on a flywheel this week..not something I normally do anymore, but as I was already set up for flywheels this week it was an easy deal to knock out.

I was a little surprised at how little weight it removed.
Started at 7lb 3 oz



Removing 0.50" of OD from the weight disk only finished at 6 lb 8 oz

Reduced by 11 oz

Its what the rider feels works best for his riding style, and I cant fault that, we all ride differently, and what "feels" best for one is not the same as for another.
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Old 02-21-2018, 01:04 PM
  #168  
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Another flywheel went on a diet

Starting at a porky 7 lb 4 oz



She got a trim and a hair cut



Ending at 4lb 8 oz


Reduced by 2lb 12 oz
Attached Thumbnails Flywheel Lightening-before-7_4.jpg   Flywheel Lightening-ending-4_8.jpg  

Last edited by E.Marquez; 02-21-2018 at 01:11 PM.
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Old 03-04-2018, 03:56 PM
  #169  
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Thanks Erik. Flywheel looks smoother cleaner and nicer in person.
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Old 03-05-2018, 07:16 AM
  #170  
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Originally Posted by rus32 View Post
Thanks Erik. Flywheel looks smoother cleaner and nicer in person.
Your welcome
Enjoy the faster spin up, thats the best part
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Old 03-25-2018, 07:21 PM
  #171  
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Another flywheel went on a diet today.

Started at 7lb 3oz


Tried the world famous Texas cutting diet, know to shave pounds off your middle


And finished at 4lb 7oz
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Last edited by E.Marquez; 03-25-2018 at 07:29 PM.
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Old 05-23-2018, 06:30 AM
  #172  
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Just a reminder

Just a reminder to those wanting to install a new flywheel.. You will need a new cover gasket

GASKET, R. COVER

11394-MBB-000

About $16 street price
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Old 07-18-2018, 09:17 AM
  #173  
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Flywheel ****

Had the opportunity to do another flywheel last night.... this one is going to make someone throttle happy.


Another lightened flywheel for the sexy VTR calendar extravaganza

Started at 7 lb 9 oz, reduced 2lb 10oz
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Old 07-19-2018, 04:37 AM
  #174  
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My 2 Cents, I recently cut mine which was around 7 Lb stock. I took off 1 Lb ish and it balanced with no issues. By far it was one of the best mods I've ever done. It did idle slightly lower, which I did not mind, but it picks up revs in between gear changes so quickly that it has the feeling of not falling at all. I really love the way gear changes have been altered. Snappier, yes, but the real difference for me was the shifting. Basically stock 2005 with 2 bros slip ons.

B
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Old 07-20-2018, 11:08 AM
  #175  
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Originally Posted by ACE VenTRa View Post
My 2 Cents, I recently cut mine which was around 7 Lb stock. I took off 1 Lb ish and it balanced with no issues. By far it was one of the best mods I've ever done. It did idle slightly lower, which I did not mind, but it picks up revs in between gear changes so quickly that it has the feeling of not falling at all. I really love the way gear changes have been altered. Snappier, yes, but the real difference for me was the shifting. Basically stock 2005 with 2 bros slip ons.

B
Sounds like you could really appreciate a fully lightened one.. Chuck that flywheel back up and try a target weight of 4lb 9oz bet you will like it.

Thanks
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Old 07-20-2018, 11:12 AM
  #176  
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And another

Started at 7lb 4oz

Ended at

Off it goes to a fellow rider.
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Old 07-20-2018, 12:39 PM
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Next step for me is a total loss system, though I'm sure for a street bike a 4lb flywheel would be kickass.
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Old 09-11-2018, 05:49 PM
  #178  
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Wait what...is that another 4lb flywheel???

Why yes it is..
Starting at a porky 7lb 3 oz
Ending at 4lb 7 oz






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Old 12-30-2018, 11:12 AM
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Another of this winter's projects:



Lightened flywheel #2 @ 6ls 3.45 Oz

In process

I already have a lightened flywheel that is about 7lbs, I wanted to see the difference myself between each option. I had this extra flywheel kicking around and I finally got some time on the lathe. The next cut will be the 4.5lb option or there abouts.
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Old 12-30-2018, 11:36 AM
  #180  
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Originally Posted by ACE VenTRa View Post
Another of this winter's projects:



Lightened flywheel #2 @ 6ls 3.45 Oz

In process

I already have a lightened flywheel that is about 7lbs, I wanted to see the difference myself between each option. I had this extra flywheel kicking around and I finally got some time on the lathe. The next cut will be the 4.5lb option or there abouts.
Few things to for you to consider.
The basket is easily deformed in a chuck, damaging the magnets inside as well as causing run out in the hub as you cut.
The basket can not be cut when your chucking from the basket, and you must cut the basket to achieve a 4.xx final weight.
The back part of the hub has to be significantly cut to achieve a 4.xx final weight, to the point there is no place to chuck the assemble from.
The basket is not true to the taper center, . So chucking from the basket means you are not taking weight concentric to the flywheel center...most of that can be corrected in a four jaw and a fair bit of set up hassle though.

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