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Saito 72 - 4/22/2012 4:06 PM   
tomfiorentino


 

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Status: offline 		Hi guys,

Brand new Saito 72b, 13X6 APC, OS F plug, 10% Omega w/synthetic castor blend on a 65 inch Champ that will have floats eventually. 5 or 6 small tanks through it, break-in as per Saito. No more than 4,000 rpm at first and slowly increase from there. I get 10,200 rpm and backed the needle off to about 9,900. That is no where near the manual in terms of high end of the range at 12,000. I'll have plenty of power to pull around the Champ....with some excess for floats eventually so I am not too concerned about the 9,900.

The only problem is I can't seem to get the idle to settle in reliably at much less than 3,200 rpm. I crept up on the low end needle by making 1/4 inch adjustments at a time and it is to the point where it transitions fine from the 3,200. If I lean it some more it quits on throttle advance and if I leave it alone I can't get it to stay running reliably below the 3,200. My guess is that I should be at around 2,600...

So...this aint the only 72 out there so I must be missing something as it should run perfect and "tic-toc" idle.

Any general thoughts?

Thanks,
Tom

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RE: Saito 72 - 4/22/2012 4:44 PM   
aguisribob@msn.com


 

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Status: offline 		I have several Saito engines and was having problems getting it right . A fellow club member gave me a hand and he applies a simple formula if you lean the LS by an 1/8 of a turn richen the HS by an 1/8 of a turn , and of course reverse it if you are going in the oppisite direction , been using this proceedure since and it has been very successful for me , costs nothing to give it a try , good luck

Bob A Club saito #705

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RE: Saito 72 - 4/22/2012 4:49 PM   
JPMacG


 

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Status: offline 		My 72 took a long time to break in so that it had a low and reliable idle. I think maybe 2 or 3 gallons. Over the break in period you can gradually lean the low end needle and idle rpm and fuel economy will gradually get better and better.

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RE: Saito 72 - 4/22/2012 4:53 PM   
cymaz



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Bob is right. It's a balancing act as you adjust both needles relative to each other. 1/4 turn on the low is too much at once. Adjust the low needle go to WOT again. Close throttle to idle readjust wait 10 secs and open to WOT if it cuts too lean if it burbles to WOT too rich. Keep adjusting til at idle the engine holds a steady even rpm if it gradually slows then too rich. Repeat.

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RE: Saito 72 - 4/23/2012 2:39 PM   
wcmorrison



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Status: offline 		My experience is that it takes a long time to get to the low idle on a Saito.  It just needs a long time to break in.  Once there though it really does idle at a low RPM.

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RE: Saito 72 - 4/23/2012 10:50 PM   
Ernie Misner



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Status: offline 		Also you might be turning the LS needle too much at once. When you get it in the ballpark just lean it 1/16 turn at a time (yes they can be sensitve when you're close) until it dies when you hit the throttle hard. Then richen it back up veeeery slightly, won't take much. That will be your best compromise setting. They will tick over like a sewing maching when too lean but won't take the throttle.

Also it will not be so sensitive to adjustments if you go to 15% nitro.

Ernie Misner

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RE: Saito 72 - 4/24/2012 2:05 AM   
tomfiorentino


 

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Status: offline 		Ok great guys. I'll get back at this once the weather clears and there are some good suggestions here.

Low end did seem sensitive....time to tweak a little more and then I'll get some time on the engine in the air.

Thanks again.

Tom

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RE: Saito 72 - 4/24/2012 3:00 AM   
blw



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Status: offline 		Tom,

The APC 13x6 is a good prop for the 72. The 72 is a great engine. I would add that it is best to peak your hs and leave it there. Don't richen it until you are finished tuning. The ls is the most important thing on the engine. You may have to retune periodically until completely broken in. The 72 will seem broken in soon, but wait until it has around 2 gallons burned thru it.

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RE: Saito 72 - 4/24/2012 2:01 PM   
tomfiorentino


 

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quote:

ORIGINAL: blw

Tom,

The APC 13x6 is a good prop for the 72. The 72 is a great engine. I would add that it is best to peak your hs and leave it there. Don't richen it until you are finished tuning. The ls is the most important thing on the engine. You may have to retune periodically until completely broken in. The 72 will seem broken in soon, but wait until it has around 2 gallons burned thru it.


OK...I notice too that the manual indicates to adjust/check the valves after one hour of run time so I'm probably getting close to doing that too. We are in a cycle of bad weather for the whole week looking at the forecast. So I'm going to run it tonight with the tail out the back of the barn...I'll just double check HS, get the idle adjusted and set the LS needle so everything is reliable. Then I'm flying!

Here is the plane by the way....

Tom

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RE: Saito 72 - 4/24/2012 2:11 PM   
Hobbsy



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Status: offline 		Tom. always set the LS needle with the HS needle at full peak. The needles effect each other, the HS has a fixed seat and peaking it eliminates one variable. If you try to set the LS needle with the HS set 200 or 300 rpm rich you'll end up trying to compensate for that and chase the needles forever. Here is a typical .56 setting.

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RE: Saito 72 - 4/27/2012 5:36 PM   
easystar123


 

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From: kilrean.ireland, UNITED KINGDOM
Status: offline 		hi guys, i have a saito 62 on my piper pawnee 40 but its a bit underpowered, do u think if i put a saito 72 on this plane i would notice a step up in performance?

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RE: Saito 72 - 4/27/2012 5:41 PM   
tomfiorentino


 

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quote:

ORIGINAL: Hobbsy

Tom. always set the LS needle with the HS needle at full peak. The needles effect each other, the HS has a fixed seat and peaking it eliminates one variable. If you try to set the LS needle with the HS set 200 or 300 rpm rich you'll end up trying to compensate for that and chase the needles forever. Here is a typical .56 setting.


Hobbsy,

Looks like the weekend is going to be dry at least so I may be jumping back into this a bit. A few folks have said the needles effect each other so I will keep that in mind. Question though, what do you mean when you say the HS needle has a fixed seat? What is that or as opposed to what?

Thanks,
Tom

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RE: Saito 72 - 4/28/2012 12:36 AM   
jeffie8696



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Status: offline 		On a twin needle carb the low speed needle moves in and out with the throttle barrel to choke down the fuel at idle. The high speed needle is just an adjustable orifice that stays where you set it. A too lean idle needle can affect the high speed setting by blocking the orifice so you should be aware of this.


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