Bloody Ell! Would you ??

[DrFarkoff]

A guy on another forum I am on has had this done to his R90/6 flywheel it weighs 2.380 KG or 5lb 4oz

I don;t know about the rest of you but I am in two minds Yes Lovely and Much lightened but maybe too much lightened risk of shattering maybe?

Looks Damn pretty tho!!

 

[Rob Farmer]

Very nice. It's going to rattle like a bastard at tickover and have bugger all torque. Why would you want to do it?

 

[Timpo]

I think he owns the wrong bike.......

 

[peepingtom]

looks nice but i like to ride one with and one without to see how differant they are . i prefer torque to top end generally so probably not unless it was on a special maybe

i bet his drill bit is blunt now

 

[Captain Black]

Won't it make the bike into a slug when starting of from a standstill ?

 

[Fanum]

Crunch rattle rattle *belch*

I know little about flywheels, but I wouldn't be happy with that in a machine

 

[JayC]

Won't it make the bike into a slug when starting of from a standstill ?

It should spin up PDQ , but as said, bugger all torque and no engine braking. He should've bought an RD.

 

[Rob Farmer]

Won't it make the bike into a slug when starting of from a standstill ?

Yep! All revs. may as well buy a Jap bike and have some real performance.

 

[duckspeed]

Does not look to have enough area left for the clutch driven plate to drive on, recon we may have slippage

 

[ghiribizzo]

First thing he'll be disappointed with will be the poor idle running.

 

[Hustler]

Very nice. It's going to rattle like a bastard at tickover and have bugger all torque. Why would you want to do it?

Won't it make the bike into a slug when starting of from a standstill ?

It should spin up PDQ , but as said, bugger all torque and no engine braking. He should've bought an RD.

Does not look to have enough area left for the clutch driven plate to drive on, recon we may have slippage

First thing he'll be disappointed with will be the poor idle running.

But apart from those little quibbles, are there any good points ?

 

[fayeslane]

But apart from those little quibbles, are there any good points ?

It's light and pretty

 

[Box’a’bits]

But apart from those little quibbles, are there any good points ?

Some fairly uninformed & contradictory opinions there...

 

[mark71]

Love to see how it vibrates at high speed and low speed for that matter due to bugger all balancing but heh ho if we didn't push things and try we wouldn't get anywhere.

Mark

 

[Deleted account 211025001]

Why would the bike vibrate more if the flywheel was lightened?

Andres

 

[DrFarkoff]

Flywheel mass helps to damp the inertia of the spinning masses and hence why a boxer or a Guzzi twists below you when you rev it at a standstill

But with everything there is a critical mass where the damping saps engine power

Why would the bike vibrate more if the flywheel was lightened?

Andres

 

[Shep]

I don't give a fek about the flywheel but his engraving made me feel much better

 

[DrFarkoff]

Took me a minute Shep but I spotted it It's a Club Tool loaned out on the tool scheme LOL

I don't give a fek about the flywheel but his engraving made me feel much better

 

[seahorse]

It was done by Jim Cray, who has a good reputation with airhead boxers. Does seem a bit much though.

 

[(RIP) Proff]

Love to see how it vibrates at high speed and low speed for that matter due to bugger all balancing but heh ho if we didn't push things and try we wouldn't get anywhere.

Mark

Flywheel mass helps to damp the inertia of the spinning masses and hence why a boxer or a Guzzi twists below you when you rev it at a standstill

But with everything there is a critical mass where the damping saps engine power

It was done by Jim Cray, who has a good reputation with airhead boxers. Does seem a bit much though.

1,,, It IS balanced, look at the machining twixt some holes.
Butler and Smith were the first to do this to a flywheel as far as I know
2,,, Jay is right but by feck they do rev well.
3,,, Jim Cray has been doing this to flywheels for years and years, mainly for Classic bike Boxer racing...

How do I know?
Well in 1979/80 we had an EX Butler and Smith racing R90/6 in for a clutch change, owner had bought it over with him from USA [USAAF flyer]
I took it out after and it would have blown my R90s into the dust on the quick bits [or track].
In town tho' it was a nightmare, stalling if you pulled away with less than 2.5K revs...
Remember it was Butler and Smiths efforts in racing that bought about the R90s as a production bike..