Fly Wheel lightening ?

[E.Marquez]

You guys seriously though what will it do to my bike because im doing it tomorrow , will it ruin my bike ? what about the engine braking will i lose that ? will it still accellerate as good as standard ?

quicker response and more engine braking, I only cut the flywheel on mine like the American guys but its noticeable

But the American guys are cutting um like you guys

Actually, I cut um down in 1 of 4 flavors depending on what the user wants.

But thanks to the trail blazing a few on your side of the pond did.... my "All the way version" is like the one on this thread.

[Varastorm]

How are you holding them in the chuck? Do you use a 4 jaw & dti them or hope for the best with a 3 jaw?

[E.Marquez]

How are you holding them in the chuck? Do you use a 4 jaw & dti them or hope for the best with a 3 jaw?

I have used a mandrel made from a crank shaft in a 4 Jaw.



And now have a better option.

[Varastorm]

Hi,

Thanks for the advice all, especially the info & pictures E.Marquez posted, really appreciated.

The Varadero flywheel has arrived & it weighs a bit, 2186g or 4lb 13 1/8oz in old money, with the sprag still on. I will remove the sprag clutch tomorrow & update the weight so it can be cross referenced with a VTR one.

I've also just won a VTR crank & flywheel, so once they arrive I will be making a mandrel out of the crank, & practicing on the VTR flywheel Shame really as its a good low mileage crank

I know the Varadero has a larger/heavier flywheel, so its reasonable to think it has a bigger winding for the alternator also. If so, & the VTR flywheel will not fit I might have a lightweight VTR flywheel for sale soon.

I'm thinking of challenging cybercarl's super lightweight world record flywheel, as its not going on my bike

The lucky person who fits it might celebrate Christmas on the A&E ward with a missing left foot On the up side, I heard they serve a cracking Christmas dinner & no worrying as to who's going to wash the dishes

[E.Marquez]

Hi,

Thanks for the advice all, especially the info & pictures E.Marquez posted, really appreciated.

I've also just won a VTR crank & flywheel, so once they arrive I will be making a mandrel out of the crank, & practicing on the VTR flywheel Shame really as its a good low mileage crank

If your going to use a mandrel made from a crank... You'll need a sacrificial bolt... tighten it in place then counter sink it for your live center.... Due to the nature of the threaded crank mandrel, and bolt thread dimensions.. reusing a counter sunk bolt for your live center does not work.. a new once each time is needed or you will find your live center and part are not running true

[gl_s_r]

Hi,

The Varadero flywheel has arrived & it weighs a bit, 2186g or 4lb 13 1/8oz in old money, with the sprag still on. I will remove the sprag clutch tomorrow & update the weight so it can be cross referenced with a VTR one.

I'm thinking of challenging cybercarl's super lightweight world record flywheel, as its not going on my bike

You'll not have to do much as your flywheel only seems to need about 6oz removed to break that record...I think the VTR flywheel comes in around 8lb 11oz or so with the bits attached so you are already 4lb underweight. Result!

[Varastorm]

Hi,

The Varadero flywheel has arrived & it weighs a bit, 2186g or 4lb 13 1/8oz in old money, with the sprag still on. I will remove the sprag clutch tomorrow & update the weight so it can be cross referenced with a VTR one.

I'm thinking of challenging cybercarl's super lightweight world record flywheel, as its not going on my bike

You'll not have to do much as your flywheel only seems to need about 6oz removed to break that record...I think the VTR flywheel comes in around 8lb 11oz or so with the bits attached so you are already 4lb underweight. Result!

Oops, funny how the flywheel weighs exactly the same as the max weight of the scales

Right, after that farce I pulled the human scales out & kept the drug one & it's a rough measurement but it shows 6.2kg / 13.669 lb.

I'll invest in a better scales, but in the meantime I'll go & have a long deep talk in the mirror

“The statistics on sanity are that one out of every four people is suffering from a mental illness. Look at your 3 best friends. If they're ok, then it's you.”

[VTRDark]

“The statistics on sanity are that one out of every four people is suffering from a mental illness. Look at your 3 best friends. If they're ok, then it's you.”

Join the club. Absolutely everyone has at least one mental illness of some sort, they just need to label the ones we don't talk about.

2p = 1/4 oz approx. If you use metric 7gms it would be less.

(:-})

[fabiostar]

so to cut a long story short. im gona hunt down a flywheel after xmas so who can do this little job of turning my flywheel into a giver of joy for me..

[Varastorm]

I have been lazy over the Christmas period & its too cold to be out working/riding on the bike.

But not too cold to be sitting in front of the computer conjuring up simple mods

Has any one looked into the possibility an easy flywheel swap available instead of machining the original?

I have been looking into it for a while & think I might of narrowed it down to a couple, I know its doubtful it will work but there is no harm in dreaming, as always comments welcome

After having both the Varadero & VTR flywheels together I started thinking what else shares the same dimensions, so I started to cross reference bits, like the clutch sprag bearing, what else uses the same part number? Then the size of the Vara/VTR generator in mm & will it fit inside the (alternate) flywheel? Then the size of the flywheel puller, 22mm (to give an idea of crank diameter), and shares the same size woodruff key?

So, what Bike engine requires a 22mm puller to remove a flywheel that fits over a Vara/VTR generator coil which also mounts a Vara/VTR sprag clutch so you can mount the starting gear & uses a 25x14 woodruff key

Transalp 650

I don't know if the flywheel taper is the same as the Vara/VTR, or if it is how far the flywheel mates up the taper.

This is most likely a waste of time & energy but nothing ventured nothing gained.

I also looked at the CBR929 (same sprag, generator would fit & woodruff) but think the crank diameter is smaller.

Any one looked into the SP1?

Happy new year BTW.

[templ8]

Very very interesting, just had a look on ebay and bought a transalp flywheel dirt cheap.
I'll let you know how it fits, if it fits.

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[VTRDark]

Well done Vara I really appreciate you venturing into new ideas/alternatives there. I'm also finding the subtle differences between the vara and vtr really interesting.

and well done templ8 for taking the plunge. Let us know how you get on.



(:-})

[Varastorm]

Well, talk about quick on the draw McGraw. I was watching that Finished typing, Popped to the fridge for a drink, sat down & tried to hit the buy it now Gone!

Like I mentioned, this is something to be very careful playing around with as nothing has been measured up & make sure you have the clearances required.

Keep me posted & I'll look up some more

[templ8]

[PISTOL]
No messing about me mate.
I've been mulling this over for weeks and was watching a complete crank/flywheel assembly for the vtr, but was going to go down the route of having it rebalanced after machining.
I used to lighten flywheels for the old e30 bmw cars a few years ago and had a place not too far away balance them up for me.
The problem with leaving them unbalanced isn't bearing or crank failure, but the flywheel itself grenading under stress, albeit less likely with the smaller steel units on bikes than the large cast units on cars.

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[templ8]

Well the 00-06 transalp 650 flywheel is here, the puller thread and generator are the same dimensions as the vtr and the flywheel is much smaller.
However, the sprag mounting holes are different so the vtr sprag won't fit without mods.
Can anyone confirm the diameter of the vtr starter gear, the surface that acts on the sprag clutch please ?.
If it's the same as the transalp it'll fit straight on.
Until my m22 x1.5 puller comes I can't get mine off to check.

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