Ignition advancer rotor

[brianpb]

Found this on eBay, has anyone tried one?

Can any super knowledgable techie out there confirm the 'science' behind it?

i have vague memories that advancing the ignition does give some performance benefits but to the detriment of something else?

YAMAHA XJ900 DIVERSION 900F 4 DEGREE IGNITION ADVANCER ROTOR YELLOW ZINC PLATED

Regards
Brian

[CD]

The spark advance allow engine to to run posh petrol and make more power.
Normally the D900 feels just the same on cheap or posh petrol.
Downside is likely to be pinking on plain 95-RON.

[brianpb]

Just ridden 418 miles over the last couple of days and decided my Divvy 900 has enough poke for me, so won't be messing with the ignition timing. No problems with either top speed or quick overtakes as my mate on his ZZR1100 will testify.
He has more straight line speed but in the real world of mobile chicanes there isn't a lot of difference between the two.

So as with other things, in life it's not what you've got it's how you use it!! 

[GAv]

.

The great joy of the Divvy I found was the silky smooth delivery, good MPG and a really nice riding position.
OK so the Divvy got sold, and the Ape didn't , but the two best rides this year were on the Yam, as was the worst, when the brake grabbed on and I nearly got off coming home from picking it up, not thankfully literally on that occassion!bringing it home in January, but the good ones after sorting out the brakes.

With regards to this advance thing, what is the point , it isn't gonna help the effects of ethanol fuel. I got talked into having a fuel saver device on a Nissan Bluebird, back in the late 80s, when casagenic unleaded was in its infancy. They retarded the ignition and before going on a trip to Cornwall, I took the car in for a service at the dealership the car came from.

Whilst a curtesy car was being arranged, a friendly salesperson said he had a similar device fitted to his Bluebird Turbo and went well enough, but a directive from Nissan said under no circumstances should such said be fitted to company or privately owned Nissans , as it would nullify warrantees, but I kept it on for the West Country trip, and every fourth tank put leaded in and could feel the top end pulling stronger, but on unleaded the acceleration was better.
However when it started pinking under load, off came the device, I sawed it in half to find a spring and magnet. Maybe as was the claim the same technology helped Merlin powered WW2 Spits Hurricane's and Packard licence built Rolls Royce V12Mustangs, after the Allison engines were found wanting, this to enable them to run on poor quality Avgas, but that device was simply a waste of money.

[brianpb]

As I have said before the Divvy is 19 years old in a few days, I picked it up new on 1st June 1996, after a few years I thought I would like a new bike (that was when I worked and could afford such things) and looked at many over the years.
In the end it all came down to cost to change and looking at what the new bikes offered I couldn't justify it to myself let alone to my wife. Yes some of them might have been a bit faster, with the advent of fuel injection some were almost certainly a bit smoother, one or two of them may have been a bit more comfortable, but none of them did anything so much better than the Divvy to even begin to justify spending several thousand + to change, especially as the Divvy is in effect one of my toys and doesn't do a huge mileage.

The only thing I may possibly change it for in the future would be for something a bit lighter as my ageing body gets weaker!
 
That is why I still have it and to be honest I don't regret keeping it at all