Tuning OS's

[Brian Young]

With regard to the Webra bearing Ive had good luck
getting steel ones from local bearing suppliers. Never
tried for stainless though, youve probably already
tried locally but if you havent....

We had Koyo in for a bearing presentation at my work a
few weeks back. I tried to get some all ceramic
samples to fit...grinning they said "your sales rep
will take care of that how many do you need"....theyre
$750 a piece with ceramic balls, race, with composite
retainer. Needless to say they havent shown up yet.

--- "Henderson,Eric" <Eric.Henderson at gartner.com>
wrote:
> Dave,
>            I bought mine from Hong Kong - (They are
> helicopter motor carbs.)
>  
>  
> The Webra MC carb is approx. 17 mm and has more than
> enough meat to allow it to be turned down to 15 mm.
> It looks like there will be enough will take OS 
> gripper-bolt without crushing The quality of the OS
> carb is visually more appealing than the MC.(IMHO) 
> It also is graduated more clearly and does not have
> controls that rotate 360. Makes installation logical
> and easier. The set up takes about ten minutes.
>  
> As an aside, the big problem I am finding with the
> Webra 1.60/1.45 is finding a stainless steel
> bearing. It is an odd size. 20 x 40 x 8, I think.
> The 8 mm being the issue.
>  
> Any German based readers out there know of any
> sources, even if they are in Webra-land, I'm sure
> they take Visa?
>  
> Regards,
> 
> Eric.
>  
>  
>  
>  
>  -----Original Message-----
> From: discussion-request at nsrca.org
> [mailto:discussion-request at nsrca.org]On Behalf Of
> Dave Smith
> Sent: Thursday, January 22, 2004 12:15 PM
> To: discussion at nsrca.org
> Subject: Re: Tuning OS's
> 
> 
> Hi Eric:  A few months previous I tried to buy an
> M/C carb for my OS 1.40"s.   I was told they were no
> longer available in NA,due to lack of denand.
>  
> I tried to buy one from Singapore,and just missed
> their last one.  Glad now I missed it as price was
> atrocious
>  
> About that time Webra arrived on the scene with
> their M/C Carb,which seems to be quite popular.
>  
> (1)    Does OS perhaps have plans to bring their MC
> Carb back to NA,at a reasonable price.
>  
> (2)    Will The Webra MC Carb fit the OS Case,or be
> easily modified to do so?
>  
> Cheers,,,,,,,,,,,,,Dave
> 
> ----- Original Message ----- 
> From: Henderson,Eric
> <mailto:Eric.Henderson at gartner.com>  
> To: discussion at nsrca.org 
> Sent: Thursday, January 22, 2004 12:32 PM
> Subject: Tuning OS's
> 
> 
> My time with the OS 1.40RX goes back to 1997/8 when
> I bought four of them and a tuned pipe from a small
> English hobby shop, on one of my trips to the UK.
> Although I don't own the motors anymore I know where
> they are. :-)   The UK customs had a fit when they
> saw the pipe on their x-ray machine... Just made the
> plane in time...
> 
> The first modification was a new carb-jet that OS
> provided FOC to cure a mid-range gurgling problem. 
> Back then,  the motor was a novelty and not taken
> seriously, even though it pulled my old Hydeout
> vertically out-a-sight.  Things went quiet for a
> while and around the year 2000 there was an upsurge
> of interest. The EFI caught a lot of attention and
> then the experimenters started working on their
> 2-cycles of all types. The second modification was
> to fit stainless steel bearings :-)
> 
> The price of the OS 1.40  EFI made us look at the RX
> again. Dave Shadel came out with a piston and liner.
> Fuel was modified to meet the spec's that OS had
> always listed. Coolpower was always around 15/17-18
> and often proved to be the best fuel for the average
> pattern OS 2-c pundit. The OS 1.40 RX had a
> different shaft and carb by then. The new carb had a
> bigger throat and the shaft had a narrower mouth.
> Never got to try an old shaft with a new model carb.
> Did cut a 1.40 two plug head that was never tested.
> Found out that one OS "F" did the job with less
> plug-fuss.
> 
> The Shadel liner is not a must but does give more
> power. I like it because it is an aftermarket add-on
> that anyone could fit. Another aftermarket is the OS
> mixture carb. I first heard of this from Jeff
> Carrish. I then got to fly one on
> Dixie-Chicks-Earl's Temptation. The Webra MC testing
> got me interested and then the flight-experience
> convinced me that this carb (Approx. $79) makes a
> big difference. You have five points on the carb and
> seven on a JR 10X. You can adjust the carb to
> perfectly match the behavior of almost any pipe.
> With the OS Hatori and this carb on a 1.40RX it was
> just like flying the 1.40 EFI. ( This motor BTW
> still had the std liner etc.)
> 
> I was so impressed with the tunability of this carb
> that I am fitting one to my 1.60 as soon as it
> arrives in the mail - checking for it every day...!!
> 
> As much as I like to only do easy after market mods,
> I did break down with the OS 1,60. The 1.40RX pump
> was so good that I grafted one to my motor and ran
> it last season. The 1.60 Carb worked just fine and I
> am told that the 1.40 RX carb  works even better, at
> least in Norway or Sweden? (They  all have 15 mm
> openings in the crankcase).  An OS 1.60 FX w/pump
> and an OS mix carb should be pure fun to play with
> and of course, fly!
> 
> I still hope that OS will come out with a rear
> exhaust 1.60, (or more),  w/pump. 
> 
> Is winter over yet? 
> 
> Regards,
> 
> Eric. 
> 
> 


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