Flywheel lightening

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RuZty
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Posts: 3584
Joined: Fri Oct 03, 2003 11:11 pm
Location: Southern Ontario, Canada

Re: Flywheel lightening

#16 Post by RuZty » Sat May 19, 2018 10:35 pm

Why dick about modifying 30 year old motorcycles? Find and buy a faster motorcycle, for a genuine improvement?
There are plenty available. Not free, but then nothing new ever is.

....unless you enjoy dicking around with old motorcycles, then carry on. :smt002

(F5)
Posts: 630
Joined: Mon Sep 27, 2010 7:21 pm
Location: Wellington New Zealand

Re: Flywheel lightening

#17 Post by (F5) » Sun May 20, 2018 5:09 am

Hahaha.
Thanks for posting. :smt003
496 Cheetah. TSS PVs, PWK35s, Ignitech, RGV(ish) chassis

RuZty
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Posts: 3584
Joined: Fri Oct 03, 2003 11:11 pm
Location: Southern Ontario, Canada

Re: Flywheel lightening

#18 Post by RuZty » Sun May 20, 2018 6:29 am

A quick calculation puts the difference in inertia of a 2 mm cut to be about -16%, not bad for free. [smilie=cool.gif]

Bare
Posts: 1196
Joined: Sun Jan 29, 2006 2:18 am
Location: vancouver

Re: Flywheel lightening

#19 Post by Bare » Sun May 20, 2018 11:16 pm

RuZty wrote:Why dick about modifying 30 year old motorcycles? Find and buy a faster motorcycle, for a genuine improvement?
There are plenty available. Not free, but then nothing new ever is.

....unless you enjoy dicking around with old motorcycles, then carry on. :smt002

Being a hapless Dick are we?

It's possible to buy an Ignitech or Dynapower flywheel/ stator assly. Designed to fit the Yama 350 engine
Which is Purpose designed to be Lighter for performance reasons.
Shaving a few mm off of the oem Yama flywheel is V close to pointless.

LC Cnd
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Posts: 1454
Joined: Sat Feb 08, 2014 5:39 pm
Location: Vancouver Is. Canada

Re: Flywheel lightening

#20 Post by LC Cnd » Fri Jun 08, 2018 12:56 am

Done. Be interesting to see what the result will be on the throttle. Created a woodruff key in an inverted 'T' shape to tightly fit the worn/widened channel in the flywheel to fit tight.
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hondaror
Posts: 2828
Joined: Mon Mar 03, 2014 8:44 pm
Location: Alberta, Canada

Re: Flywheel lightening

#21 Post by hondaror » Sun Jun 10, 2018 4:20 am

Keep us posted.
Rory
2 1984 RZ350s
1985 RZ350
9 1986-1990 RZ350s
2000 ST2
2005 749
2005 749 with 999 engine

Hooligan
Posts: 1966
Joined: Mon Aug 20, 2012 1:37 am
Location: Calgary, Alberta

Re: Flywheel lightening

#22 Post by Hooligan » Fri Aug 10, 2018 2:25 pm

hondaror wrote:Yeah, wow, that one is cut down. That looks like a fun mod. I might have to try that.

As far as balancing goes, drilling small divots where it is heavy, is effective.
And how do you know where it is heavy?
'82 RD350LC in '81 colours, OEM pipes, UNI filters
'85 FZ750

Hooligan
Posts: 1966
Joined: Mon Aug 20, 2012 1:37 am
Location: Calgary, Alberta

Re: Flywheel lightening

#23 Post by Hooligan » Fri Aug 10, 2018 2:28 pm

LC Cnd wrote:I get that balance is key - can this be acheived in a static balance setup, like balancing a motorcycle wheel, or does the flywheel have to be in constant motion to find where to drill to balancing out? Found this photo'd sample on a Harley form. Then there is the question of how much to drill that's the challange. The video, on shaving a flywheel, stated that is not a issue interestingly.
I suspect that turning the OD of a flywheel would not affect the balance. It would simply take off the same amount all around the flywheel.

If anyone has a spare flywheel they'd like to donate, I have all the equipment to do this mod. I even have a tire balancing stand and could make up bushings to mount the flywheel.
'82 RD350LC in '81 colours, OEM pipes, UNI filters
'85 FZ750

Hooligan
Posts: 1966
Joined: Mon Aug 20, 2012 1:37 am
Location: Calgary, Alberta

Re: Flywheel lightening

#24 Post by Hooligan » Fri Aug 10, 2018 2:31 pm

RuZty wrote:Why dick about modifying 30 year old motorcycles? Find and buy a faster motorcycle, for a genuine improvement?
There are plenty available. Not free, but then nothing new ever is.

....unless you enjoy dicking around with old motorcycles, then carry on. :smt002

If someone YAMAHA would simply build this thing then I wouldn't have to dick around with old motorcycles.

Image
'82 RD350LC in '81 colours, OEM pipes, UNI filters
'85 FZ750

Hooligan
Posts: 1966
Joined: Mon Aug 20, 2012 1:37 am
Location: Calgary, Alberta

Re: Flywheel lightening

#25 Post by Hooligan » Fri Aug 10, 2018 2:33 pm

RuZty wrote:A quick calculation puts the difference in inertia of a 2 mm cut to be about -16%, not bad for free. [smilie=cool.gif]
Its not free. It requires ca $10k in machinery and tooling not to mention the years of machining experience to do it correctly. :smt021
'82 RD350LC in '81 colours, OEM pipes, UNI filters
'85 FZ750

RuZty
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Posts: 3584
Joined: Fri Oct 03, 2003 11:11 pm
Location: Southern Ontario, Canada

Re: Flywheel lightening

#26 Post by RuZty » Fri Aug 10, 2018 9:00 pm

Free if you already have those things at your disposal. :smt002

Hooligan
Posts: 1966
Joined: Mon Aug 20, 2012 1:37 am
Location: Calgary, Alberta

Re: Flywheel lightening

#27 Post by Hooligan » Fri Aug 10, 2018 9:45 pm

Sweat Equity is NEVER free. I've burned myself and cut myself and broken stuff and spent hours upon hours learning how to do this stuff.
'82 RD350LC in '81 colours, OEM pipes, UNI filters
'85 FZ750

hondaror
Posts: 2828
Joined: Mon Mar 03, 2014 8:44 pm
Location: Alberta, Canada

Re: Flywheel lightening

#28 Post by hondaror » Sat Aug 11, 2018 4:11 am

Hooligan wrote:
hondaror wrote:Yeah, wow, that one is cut down. That looks like a fun mod. I might have to try that.

As far as balancing goes, drilling small divots where it is heavy, is effective.
And how do you know where it is heavy?
There are ways.
Rory
2 1984 RZ350s
1985 RZ350
9 1986-1990 RZ350s
2000 ST2
2005 749
2005 749 with 999 engine

Hooligan
Posts: 1966
Joined: Mon Aug 20, 2012 1:37 am
Location: Calgary, Alberta

Re: Flywheel lightening

#29 Post by Hooligan » Sun Aug 12, 2018 12:37 am

VERY helpful :smt017
'82 RD350LC in '81 colours, OEM pipes, UNI filters
'85 FZ750

hondaror
Posts: 2828
Joined: Mon Mar 03, 2014 8:44 pm
Location: Alberta, Canada

Re: Flywheel lightening

#30 Post by hondaror » Sun Aug 12, 2018 2:50 pm

Across two scales. Measure, Mark, rotate. You have to calculate, but it works.
Rory
2 1984 RZ350s
1985 RZ350
9 1986-1990 RZ350s
2000 ST2
2005 749
2005 749 with 999 engine

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