Silk purse from a sow's ear

[Fast n Furious]

I need a flywheel. Usually, I use a 2kg gp type, but I'm thinking of being a bit different and using an af lightweight one at about 1.4kg.

I'll have external trigger, so no issue there, but I'm sure I've heard of problems with them.

Anyone know more?

I think it's a 'pot luck' situation really and it just depends on how you wrag it.
Under 25hp, then those machined down indian flywheels are usually ok.
Best to lap grind any new flywheel to the crank first. and make sure the woodruff key doesn't "bottom out" after the flywheel has been taper locked to the crank.

[dickie]

I think it's a 'pot luck' situation really and it just depends on how you wrag it.
Under 25hp, then those machined down indian flywheels are usually ok.
Best to lap grind any new flywheel to the crank first. and make sure the woodruff key doesn't "bottom out" after the flywheel has been taper locked to the crank.

Thanks f&f but it's the af one I'm asking about. I usually use those lightened Indian ones and can get round their issues no problem.

But I hear the af one has some other problems. But I don't know what they are.

[martyn dwane]

i believe they run fine with the external pick up.

[Wee Mark]

The very light AF flywheels make starting a pain and it also makes the Scooter difficult to ride round town

[martyn dwane]

The very light AF flywheels make starting a pain and it also makes the Scooter difficult to ride round town

gotta disagree with your statement , ive used an original AF light flywheel (Ducati type) since they first came out . not hard to start at all and a joy to use up and down thru the gears and around town.

[Fast n Furious]

Agreed... it doesn't make it any harder to start. However......... it is likely to make it more prone to kickback which isn't good for our aging knee joints!
One way around this (albeit costly) is to use a programmable ignition system that sets the ignition advance to 14 degrees BTDC for speeds under 800RPM. Programmable ignition maps are very good at compensating for lumpy low rpm running caused by the lack of inertia from a lightened flywheel.

[dickie]

Well, I've bought one anyway. As this build will have fairly high port timings and an expansion, it seemed to make sense. Also, when I searched around, it seemed like pick up alignment was an issue but as an external-pickup-convert, this isn't an issue for me.

Barely touched it lately as I've been doing a couple of jobs for others and fixing the car. Then there's all the boozing commitments to deal with

[ROClarke]

[dickie]

Decided to shelve this job for a while. I've got too many jobs half-cocked at the minute. Next winter probably.