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12-07-2004 09:13 PM  13 years agoPost 1
flaming blades

rrApprentice

hertfordshire, UK

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What is the best gear ratio and pipe compination for a YS 91 in my mille 2 and is there any pointers i should look out for when installing a 90 in my mille.

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12-07-2004 09:35 PM  13 years agoPost 2

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Gearing

Hi, I use a 15t on cspec ps with a cmp II, a 90 fan and shroud wil be required along with the 90 clutch, holes will need to be slotted an extra 1.5mm, and do this very carefully as to aligne the starter cup assembly then all should run.

Hope tis helps.

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12-07-2004 09:52 PM  13 years agoPost 3
flaming blades

rrApprentice

hertfordshire, UK

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Why will I need a differant fan and clutch and also what do u meen by I will have to slot the holes. Will the gearing still be the same for a YS.

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12-07-2004 10:22 PM  13 years agoPost 4
MJA

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UK

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The 90 fan shrouds and clutch aren't essential to have ,
but good to have
,especially the fan and shrouds.
The fan and shroud shifts more air for a lower rpm than the smaller diameter setup (or one would hope it does,seems to me to have more draft than the 60 size did anyway).The 90 clutch is weakened slightly on the wall area which i think is intended to make it bite harder at a lower rpm.The one i got did not seem any heavier in weight.It seems to work ok with the 60 size clutch as well,it did for me anyway

The frames have to be slotted as the clutch bell has to move further from the maingear now as the 90 size pinions (15,16Tooth)have more teeth and increases in their overall diameter.Because the pinion block and clutch bell has to be moved the engine also needs packing pieces under the engine beams the same distance/thickness.

One of the big problems the Millenum has with the 90 engines (90's accelerate it greatly)
is it rags the pinion's bearing contact surface something terrible and polishes the inner surface of the pinion support bearing making it a very slack fit and enventually can cause glitch hits if not attended to.
It seems to do this even when locktighted and lined up to the n'th degree with an initial tight fit

If you have to buy a new pinion for 15T or 16T for this conversion
i would go for the double bearing support Millenium 3 version.
You may need a different upper block too

I think they only do the double height one in 16T but i may be wrong

Another thing which should help is the new sideframe stiffener pieces,
that Russ Deakin developed .If you have some spare cash,all the 6 alloy frame spacers from Quick UK,or the full set including the through braces from Ramster would be good to have on it too with a 90

Rc-Market does a full CNC support cage for the pinion too but i think it may break clutches unless you use the frame stiffeners from NHP/Revolution Models to reduce the frame flex

I have used the MPII with the YS91 but not in the Millenium,with a Futura SE.I've only used the older OS91 and the C-spec in my Millenium.The Hatori SB's are supposed to be good with the YS91's too.You could try a Zimmerman muffler but with my OS91's the Muscle PipeII pisses on it for power with 10% nitro but isn't as smooth running

Martin

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12-08-2004 07:33 AM  13 years agoPost 5
Futurac

rrKey Veteran

Belgium , Europe

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Clutch

Martin

Clutches broke not because of Double bearing block or else
Most if it was related due to thinned clutch liner used in clutch bell.
Since it was replaced with the normal one, most of troubles gone
Its true that with some high load 3d you do need a frames stiffeners, it will do the job.

Alex (Formerly Known as RCMarket )

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12-08-2004 08:53 AM  13 years agoPost 6
flaming blades

rrApprentice

hertfordshire, UK

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So u think a worthwile upgrade would be the frame stiffeners.

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12-08-2004 09:56 AM  13 years agoPost 7
BigChopper

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Cambridge, UK

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flaming blades,

Here's how I upgraded my millie to start with (not saying this is what you have to do, but I thought it was the most appropriate)

- 90 engine (i use YS91, but whatever you like)
- 15 tooth pinion
- I kept (and still have) the 60 sized fan (the YS is ok with this)
- heavy duty clutch
- Now, do not get the mill3 pinion or double bearing block unless you put the frame stiffeners on.. IF you give it fast metronoming/hard pitch pumping you can break the clutch.. You would be better to stick with the standard pinion, but do as Alex says increase the thickness of the clutch liner so that it just drags at idle.
- If you put the frame stiffeners on, then you could add one of the pinion upgrades.
- one of the key things is to get the clutch liner thickness correct.

I have been following your posts over the last few days.. Considering you are 14yrs old and are on a bit of a budget, I really would recommend you go for a 50sized machine.. the costs are much much lower, not only parts and crash costs but also less fuel consumption...
Sure the retailers would be willing to take your money... but you cuold end up flying less because of it..

What you have to realise is that you can do as many stunts on a 50 as you can with a 90, there are very few disadvantages to using a 50 over a 90, which is why sooo many people use sceadu's or raptors.

At the end of the day you can spend all this money on a 90 machine and then not be able to afford a crash, or the amount of fuel...

think about it..

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12-08-2004 10:00 AM  13 years agoPost 8
flaming blades

rrApprentice

hertfordshire, UK

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I already have the mille so all I am effectively doing is buying a 90 amd pipe. Plus i already have a Raptor 50 with OS 50 hyper.

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12-08-2004 10:02 AM  13 years agoPost 9
BigChopper

rrKey Veteran

Cambridge, UK

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I already have the mille so all I am effectively doing is buying a 90 amd pipe. Plus i already have a Raptor 50 with OS 50 hyper.
Sounds like you are doing pretty good financially, for a 14yr old!

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12-08-2004 02:41 PM  13 years agoPost 10
Ramster

rrApprentice

NJ

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frame stiffeners

The frame stiffeners (frame spacers and dogbones) are not just for hard 3D, among other benefits they will dial-in (align) the frames, a very important feature that the stock plastic spacers will never achieve.
The drivetrain (with a single or a double bearing supported pinion) or any other system “hanging” from the frames will not mate properly or perform to the max if the frames are not properly aligned.


Also, the performance of the millie can’t be compared to other machines with frame sytems fully blinged with carbon and aluminum when a large portion of the millie’s frame system is plastic.


Ron

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12-08-2004 04:05 PM  13 years agoPost 11
Mark L

rrNovice

Berkshire & Lancashire UK

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Too much

gone

No darling the model shop doesn't give
receipts!!

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12-08-2004 04:31 PM  13 years agoPost 12
Ramster

rrApprentice

NJ

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Mark,

Your main blade screws are a bit long I would say


Ron

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12-08-2004 04:41 PM  13 years agoPost 13
Mark L

rrNovice

Berkshire & Lancashire UK

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Long screw

gone

No darling the model shop doesn't give
receipts!!

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12-08-2004 10:51 PM  13 years agoPost 14
3DME

rrApprentice

USA

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MILLE W/YS 91

HELLO

I HAVE BEEN RUNNING THE YS 91 IN THE MILLE FOR ABOUT A YEAR AND I HAVE HAD NO PROBLEMS OF ANY KIND. PAUL FROM ROBBE USE HAS 15 TOOTH DOUBLE BEARING PINIONS IN STOCK. WITH A 15 TOOTH YOU WILL NEED TO TURN THE HEAD AT ABOUT 1840 RPM, THIS WILL GIVE YOU 14720 RPM ON THE ENGINE AND IS WHERE THE YS91 IS HAPPY.
HERE IS A LIST OF GEAR RATIO/HEAD SPEED/ENGINE RPM

16 TOOTH=7.5 TO 1 = 1960 HEAD = 14700 ENGINE
15 TOOTH= 8 TO 1 = 1840 HEAD = 14720 ENGINE
14 TOOTH=8.57 TO 1 = 1720 HEAD = 14740 ENGINE
13 TOOTH=9.23 TO 1 = 1600 HEAD = 14768 ENGINE

HOPE THIS HELPS MIKE

GOOD, FAST, CHEAP......PICK TWO

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