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Some experiences regarding Saito FG-57 after using it a while.

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Some experiences regarding Saito FG-57 after using it a while.

Old 05-04-2015, 04:57 PM
  #126  
w8ye
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All the bigger Saito FG gas engines have the same Walbro WYD carb but the fuel nipples vary as well as the throttle and choke mechanism.

The repair kit is K-10 WYD $22.95

http://www.rcuniverse.com/forum/engi...ion-print.html










Last edited by w8ye; 05-05-2015 at 07:08 AM.
Old 05-05-2015, 09:06 AM
  #127  
kwik
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Okay, w8ye, I thank you for that!

So, I ordered a K-10 WYD for the walbro carburator of my Saito FG-57 from here;

http://www.m-and-d.com/WL-K10-WYD.html

Hopefully it will be here within the next 14 days or so, with a pump membrane that fits, so I can fly the Corsair again.

Last edited by kwik; 05-05-2015 at 09:10 AM.
Old 05-05-2015, 09:18 AM
  #128  
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Notice that the typical bad diaphragm is the one opposite the throttle arm and is under the steel cover plate with a little hole in it. This is the diaphragm with the metal center.

There is a gasket that goes against the carburetor body and then the diaphragm and then the cover goes directly against the diaphragm.
Old 05-05-2015, 09:25 AM
  #129  
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Problems on the pump side diaphragm under the die cast cover are often associated with the two check valve tabs as they will stick shut or curl open.
Old 05-05-2015, 09:32 AM
  #130  
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For me it has allways been the pump-membrane, not the diagraphm operating the valve to the chamber.

The small lips tends to curl up a bit. So they dont close completely, and the pump action is lost.

This engine has been in storage for a year, and the tank was empty while in storage.

It is rather funny;
For years I have been told by the zenoah veterans to leave some gasoline in the tank, so that the membranes dont dry out. So I have done that.

But now, this time, I stored it dry,because what is said in the Saito manual;

Quote from the Saito manual;
"But in such way of storing, gasoline accelerate degradation of rubber parts such as diagraphm".

And still this happens.
The same happened to a brand new Valach 120cc inline twin, fourstroke; It had been testrun at the factory.
Then I have had it for some months, and when I tried to start; No luck. Only run the fuel I injected directly.

So replaced the membrane with a K-22 kit, where the membrane is white=> probably mylar. All ok.

So one wonders why they still push out HDA 48D carbs in 2015 with the rubber stuff.....

Maybe a tactic from Walbro to keep all the chain-saw repair shops in business?

Last edited by kwik; 05-05-2015 at 09:43 AM.
Old 05-05-2015, 09:41 AM
  #131  
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Very true about the staying in business reason . . . .

The Mylar ones usually don't degenerate.

In some areas, fuel itself (left in carburetors) will turn to gum and mess up the action of the check valves.
Old 05-05-2015, 09:49 AM
  #132  
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For other owners reading this forum - If you are looking for carburetors or repair kits, many of those vendors do not actually have the item in stock at their brick and mortar location. They will order it from some larger stocking warehouse. I've experienced these small vendors taking a month or more to ship the order and when the part comes, it is shipped direct from the large warehouse.

I have also been personally told that the item was in stock and then get a notice a couple days later that the part is no longer available.
Old 05-05-2015, 09:50 AM
  #133  
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Yes, the gum stuff.....Actually, it might be just that in this case.

But I'd rather not start with getting the engine out from the plane , without having replacement membranes ready.
Its a big job , and you dont want to risk doing it for nothing. (Well, its not that big, but I hate doing it, anyway.)

Another sentence that is a bit funny, in the manual;

First you read that the diagraphm in a petrol carburator is degraded by ......yes, you guessed it; By petrol.

And then this;

"Generally speaking, there are very few things that will keep today's modern gas engines from starting."

hehe.
Old 05-05-2015, 10:06 AM
  #134  
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Keep in mind that by this time you more than likely have more experience with model gas engines than whoever actually wrote that manual taken from the comments of others.
Old 05-05-2015, 06:31 PM
  #135  
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Originally Posted by w8ye
Problems on the pump side diaphragm under the die cast cover are often associated with the two check valve tabs as they will stick shut or curl open.
If you are using gas as the fuel, get Pure-gas Purgas.com you will not have all the diaphragm problems. Leave the carb wet...this fuel has no additives to form gum or dried up residue in your carb. Just don,t take my word...TRY IT ASAP. Best Regards, Capt,n
Old 05-06-2015, 04:36 AM
  #136  
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Thanks for the comments i read them with great interest because i will restart mine soon after a 18 mth layoff,much appreciated.
Old 05-10-2015, 10:01 PM
  #137  
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I havent received my replacement kit yet, so the Corsair is still on the ground.

RC-Japan could not help me, probably because Saito wants to sell us complete carburators. (Same situation as with Horizon then.)

If none of the replacement kit membranes fits this carburator, I will try to make my own from 0.005 G-10 using a vinyl-cutter.
Old 05-11-2015, 05:02 AM
  #138  
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All this repair parts nightmare that Saito chooses to create makes one want to change to another more common carburetor and to change anything "Saito" about the ignition system to RCEXL or C & H?

It has the opposite effect from what Saito intended to control.
Old 05-11-2015, 05:12 AM
  #139  
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I agree ! Sad...........
Old 05-11-2015, 07:50 AM
  #140  
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Originally Posted by w8ye
All this repair parts nightmare that Saito chooses to create makes one want to change to another more common carburetor and to change anything "Saito" about the ignition system to RCEXL or C & H?

It has the opposite effect from what Saito intended to control.
Zama CQ-8 is 11mm at the flange.
Old 05-12-2015, 10:43 AM
  #141  
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Originally Posted by w8ye
For other owners reading this forum - If you are looking for carburetors or repair kits, many of those vendors do not actually have the item in stock at their brick and mortar location. They will order it from some larger stocking warehouse. I've experienced these small vendors taking a month or more to ship the order and when the part comes, it is shipped direct from the large warehouse.

I have also been personally told that the item was in stock and then get a notice a couple days later that the part is no longer available.
You were right about that.

Here is the message I got today, one week after I ordered it;

Thanks for visiting us online. Sorry for the delay as we
have just been informed the following:

The item(s) listed below are temporarily out of stock but
are on rush order from the factory.


SKU: WL-K10-WYD QTY: 2 of 2 **LEAD TIME IS APPROXIMATELY
7-15 BUSINESS DAYS**


Please let us know if you prefer to cancel any of these
items from your order. Otherwise we'll ship them out just as
soon as we receive them from the factory.

Sorry for the delay and thanks again for your order.

PLEASE include the text of this message in any replies.

M&D Customer Service
Old 05-13-2015, 06:58 AM
  #142  
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M&D is generally a good well respected company, but it will very likely be 30 days before the repair kit actually ships? So be patient.
Old 05-25-2015, 07:04 AM
  #143  
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How often do you need to adjust valve clearance on Saito FG57 engine?
Old 05-25-2015, 01:28 PM
  #144  
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Originally Posted by margus014
How often do you need to adjust valve clearance on Saito FG57 engine?
Valve lash should be set after break-in & maybe after another gallon of fuel.

After that, do it at the beginning of the flying season.

It will increase at first as the 8 contact surfaces of the valve train seat in. After that, there will be minimal wear.
Old 05-25-2015, 10:16 PM
  #145  
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Originally Posted by w8ye
....and to change anything "Saito" about the ignition system to RCEXL or C & H?
Regarding the ignition I will have to disagree.

The FG-57 ignition IS RcExcl. It was only the first ignitions we had a problem with, because it had a low voltage rate, and we didnt pay attention.

Nowadays they have, I think , 8Volts rating. It is marked on the ignition box. And is very important.

The RcExcl Saito ignitions have very high quality. Much better than those so called RcExcl ignitions you buy from some other china shop,
from where you cannot even be sure it actually IS RcExcl. Believe me, I have tried that route as well. A waste of time and money.
Old 05-26-2015, 09:35 AM
  #146  
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Yes but you have to change the spark plug connector so you can use RCEXL spark plugs correctly and get away from the high inflated price Saito plugs in the little 1/4-32 size.

Last edited by w8ye; 05-26-2015 at 04:03 PM.
Old 06-06-2015, 05:43 AM
  #147  
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Well, those who say that there doesnt exist a Diagraphm kit for the FG 57 has really led us astray.

Here; I ordered this kit from hobbyplastic. It took just a few days and I had it in my hand.

The parts fits the FG-57 as well, so I have replaced mine now.



If you cannot read the small text, it says;

SAITO Genuine Engine Parts & Accessories.

Diagraphm Kit.
FG36

SAIG36-821-1

It angers me that those who should know, doesn't know.
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Last edited by kwik; 06-06-2015 at 05:47 AM.
Old 06-06-2015, 06:47 AM
  #148  
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Originally Posted by kwik
Well, those who say that there doesnt exist a Diagraphm kit for the FG 57 has really led us astray.

Here; I ordered this kit from hobbyplastic. It took just a few days and I had it in my hand.

The parts fits the FG-57 as well, so I have replaced mine now.



If you cannot read the small text, it says;

SAITO Genuine Engine Parts & Accessories.

Diagraphm Kit.
FG36

SAIG36-821-1

It angers me that those who should know, doesn't know.
I did a search on Horizon's site W/that number & it came up blank.

A quick Google search came up W/2 sources.

Way to go Horizon! Between discontinuing 1/2 of the current available product line, constant backorder status on the most common parts and now a complete failure to list this most basic maintenance item, they are doing there best to contribute to the decline & possible demise of Saito.
Old 06-06-2015, 08:47 AM
  #149  
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+1
Old 06-07-2015, 03:48 AM
  #150  
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The engine is now running fine again, just in time for a warbird meet.

Thanks to www.hobbyplastic.co.uk

http://youtu.be/0gKgoi7Xx04

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