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Re: Flywheel lightening
Posted: Sat May 19, 2018 10:35 pm
by RuZty
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.
Re: Flywheel lightening
Posted: Sun May 20, 2018 5:09 am
by (F5)
Hahaha.
Thanks for posting.
Re: Flywheel lightening
Posted: Sun May 20, 2018 6:29 am
by RuZty
A quick calculation puts the difference in inertia of a 2 mm cut to be about -16%, not bad for free.
![[smilie=cool.gif]](./images/smilies/cool.gif "cool")
Re: Flywheel lightening
Posted: Sun May 20, 2018 11:16 pm
by Bare
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.
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.
Re: Flywheel lightening
Posted: Fri Jun 08, 2018 12:56 am
by LC Cnd
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.
Re: Flywheel lightening
Posted: Sun Jun 10, 2018 4:20 am
by hondaror
Keep us posted.
Re: Flywheel lightening
Posted: Fri Aug 10, 2018 2:25 pm
by Hooligan
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?
Re: Flywheel lightening
Posted: Fri Aug 10, 2018 2:28 pm
by Hooligan
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.
Re: Flywheel lightening
Posted: Fri Aug 10, 2018 2:31 pm
by Hooligan
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.
If someone
YAMAHA would simply build this thing then I wouldn't have to dick around with old motorcycles.
Re: Flywheel lightening
Posted: Fri Aug 10, 2018 2:33 pm
by Hooligan
RuZty wrote:A quick calculation puts the difference in inertia of a 2 mm cut to be about -16%, not bad for free.
Its not free. It requires ca $10k in machinery and tooling not to mention the years of machining experience to do it correctly.
Re: Flywheel lightening
Posted: Fri Aug 10, 2018 9:00 pm
by RuZty
Free if you already have those things at your disposal.
Re: Flywheel lightening
Posted: Fri Aug 10, 2018 9:45 pm
by Hooligan
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.
Re: Flywheel lightening
Posted: Sat Aug 11, 2018 4:11 am
by hondaror
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.
Re: Flywheel lightening
Posted: Sun Aug 12, 2018 12:37 am
by Hooligan
VERY helpful
Re: Flywheel lightening
Posted: Sun Aug 12, 2018 2:50 pm
by hondaror
Across two scales. Measure, Mark, rotate. You have to calculate, but it works.