HRC Ignition (Stator & Flywheel)

**Thu Feb 26, 2009 8:42 am » Post: #1 » Download Post**

Does anyone know the details of part 31100-NKD-970.
Is this for a MC21 & 28? If used on a 21, does it significantly advance the ignition? What type of fuel, AVGAS only or also premium unleaded.
Many thanks
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Rich
MC21 Track Bike / RS250 NF5 'Spencer', NX5 'Cadalora' & NXA 'Aoyama' / RS500 / Two Brothers Racing RC30

**Thu Feb 26, 2009 4:43 pm » Post: #2 » Download Post**

MC28, for the PGM-IV.

It's light, compared to a standard MC21 flywheel, but I wouldn't necessarily expect it to be a significant improvement over a lightened MC21 flywheel unless the static timing is the same (or better) than the MC21's.*

* I doubt it is, as it's designed to be used in conjunction with the HRC card and PGM-IV ignition, but this is pure speculation and until someone tries it on the dyno, is my best guess!

Too light on the flywheel also isn't necessarily a good thing, unless you are God on a bike! I was able to out-drag Steve's F3 on a few occasions (with the "old" F3 setup) as the inertia from my heavier flywheel (and a little bit of a weight advantage, so he claims! Wink

) would help grunt out of the corners better. He's also got larger flywheel on his now, and says it's noticeably better, also it will naturally have lost a tiny bit of its "bing... bing... bing" when you blip the throttle. (You'd know what I mean by "bing" if you heard it with the 88~89 flywheel!)
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Andy.
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**Thu Feb 26, 2009 6:23 pm » Post: #3 » Download Post**

Nice info Andy...

I have an MC28 HRC Fly Wheel and stator and looking forward to see in the dyno the differences... I will post the results when i have them...I hope within the next 10 years... ROTFLMAO

Tonight when i will go home i will weigh the HRC Fly wheel to see the difference from the stock...

First question...: If i use the HRC Fly wheel with 030 card can i use Unleaded Fuel (98 octane and up of course)

Second question...: If i use the HRC Fly Wheel with 010 card do i have use only avgas...?

Cheers
michael

**Thu Feb 26, 2009 7:12 pm » Post: #4 » Download Post**

I can only tell you what HRC say, and that's the 010 card is for leaded race fuel.

The flywheel and stator is the same part number in the U/L and leaded book though.

Fontyyy's happily ran 97/98 U/L with the 030 card (and other mods), and made around 62hp.
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Andy.
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**Thu Feb 26, 2009 8:18 pm » Post: #5 » Download Post**

Thanks Andy...

Just came back home from work and made the comparison...

Stock Fly wheel with stator weights 1.8 Kg...
HRC MC28 Fly Wheel and stator weights 0.9 Kg... Exactly the half... Razz

Cheers
Michael

**Thu Feb 26, 2009 8:44 pm » Post: #6 » Download Post**

You think thats light!

The F3 fly wheel weighs 460g as stock!

And the MC28 total loss fly wheel is only 380g!

I admit thats without the weight of the pickups.
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If I have to take the carbs off once more...

**Fri Feb 27, 2009 7:02 am » Post: #7 » Download Post**

0,46 Kg....? This is light indeed Stephen..!!!

**Fri Feb 27, 2009 7:39 pm » Post: #8 » Download Post**

Yes, 0.46kg.
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If I have to take the carbs off once more...

**Sat Feb 28, 2009 2:10 am » Post: #9 » Download Post**

Thats half again... Twisted Evil

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The Chopster

**Tue Mar 03, 2009 6:54 pm » Post: #10 » Download Post**

But there is a trade off.

I've run them all and to be honest the largest of the F3 ones is best. The 88/89 ones are just too small and the motor lacks torque. I guess thats why they added almost 200g onto the later ones.

Mine with a later F3 wheel feels so much better even if it is a little less impressive when reving up without load.

Still F3 is F3 and is nearly always better than stock.... nearly.
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If I have to take the carbs off once more...

**Tue Mar 03, 2009 6:57 pm » Post: #11 » Download Post**

StephenRC45 wrote:
Still F3 is F3 and is nearly always better than stock.... nearly.

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Andy.
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**Wed Mar 04, 2009 9:19 am » Post: #12 » Download Post**

Is the '88-89 NSR crank heavier than the F3 crank?
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The Chopster

**Wed Mar 04, 2009 6:04 pm » Post: #13 » Download Post**

No, the '88/'89 ones arn't
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If I have to take the carbs off once more...

**Wed Mar 04, 2009 6:46 pm » Post: #14 » Download Post**

It may be interesting to some that the kit RS125 crank is heavier than the stock one, for the same reason the F3 flywheel got a little heavier as it was developed.

There's not a great deal wrong with the standard crank really, except that it won't of course work with any of the F3 parts! It does need truing up however, and mass production manufacturing tolerances mean it's not always possible to get a stock crank absolutely true, so you ideally need to pick the best of a batch.
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Andy.
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**Thu Mar 05, 2009 9:21 am » Post: #15 » Download Post**

Is the '88-89 NSR crank heavier than the F3 crank?

StephenRC45
No, the '88/'89 ones arn't

OOooooooohh. Interesting... Shocked

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The Chopster