rexracer

Well Hobbsy, I finally got to run my .45 on the new test stand. Here are the numbers.

Temp. 26f +/-
Fuel. wildcat 15%, 18%oil
prop. MA 12x5

peak 10,300 richened to about 10,000...pulled 4lbs 7oz on the "thrust meter"

I would say the load is about right for this engine. I do have a couple of concerns that you may be able to help me with. i couldn't get it to idle as low as I thought it would. I got it down to 2300-2400 rpm, but it wasn't smooth. If I increase rpms to about 2800 it runs much smoother...is this "normal" for a .45 MK2? It also seems to be pushing a lot of oil out the front. After burning 6 oz of fuel, there was a puddle under the thing about 2" in diameter, and the nose of the engine was soaked. When I first got the engine it felt a little rough when turning over, but smoothed out when I oiled it up. Do you think it might be worth going ahead and doing the bearings?

PS. i don't have a pipe for this, and didn't want to run it streight out of the head, so I took the 10mm bolt that I bought to check the threads in the head and drilled out the center (about 1/4") and threaded that into the head. It's about 1-1 1/4" long. I don't know how that would affect the tuning, or the numbers. The tank was unpressurized.

Hobbsy

My Feedback: (102)

Rex, PM me an address and I'll send you a pipe, it should idle about 2,000 with no sweat. LS needle must be too rich still. Those are excellent HS numbers. Is it new?

rexracer

Thanks for the offer, but about an hour after I posted, I got a package from Horizon with a new pipe and some other odds and ends. I'll have to run it tomorrow with the pipe on it. i tried to lean it out more, but it would quit on me, so I opened the low speed back up. When I pinched the fuel line shut, it just quit with no discernable change in rpm. Is that right? or should it speed up a little before it quits? Any ideas on all the oil it's pushing through the front? It was definitely used and probably has a good bit of fuel through it. I've never seen a low speed adjustment like it has. It has a knurled brass wheel on the low speed. Are they all like that? When I put on the muffler, I'll run it with pressure from the exhaust and see if it makes a difference. The fuel level was a little above the spray bar for most of the run. I had the tank a little high because I was worried about drawing fuel with no pressure. I was probably even at 1/4 tank height.

w8ye

My Feedback: (16)

I always thought that the low speed should speed up just a little before it quit during the pinch.

If you get the idle mixture to where it runs the fastest and smoothest - then when you give it the throttle, they will quit. So the idle has to be just rich enough so the engine doesn't quit when you give it the throttle.

rexracer

That's what I remember everyone saying, so i don't know why it won't idle lower. I'll re-adjust after I put the pipe on. Hopefuly it will idle down better with a pipe and muffler pressure.

vince.b

My Feedback: (1)

how much fuel has the engine seen ?

rushspbr

I got 3 Saitos: Saito FA91, FA100 and 120SGK.
All running with byron 20/20

Clockit

Hi all

I have just got a Saito 125 GK.

I have a few questions I need answered.

1. Looking for a 90 degree muffler adapter along with a short (approx 100 mm) extension. I need to mount the exhaust behind the motor and side space is limited on the plane (approx 21mm) so I need a tight bend.

2. How will an exhaust extension affect performance?

3. Going to use a Perry pump since I plan to put the tank on the CG - any issues known by anyone?

Many thanks for any replies

Jeremy

w8ye

My Feedback: (16)

Exhaust extensions do not bother four strokes

A Cline regulator works more reliable than a pump. But people do use the vibration type Perry pump
http://www.horizonhobby.com/Products...dID=SAI125A140

rexracer

I bought it used off of e-bay, so I have no idea how much fuel has run through it. There is a slight dent in the intake pipe, but I don't think that would have any effect. Valves were way loose when i got it.

Clockit

Thanks for the link.

Excuse my ignorance but how will a regulator like the CLine provide reliable fuel supply to the motor as opposed to a pump?? My thinking is to pump fuel to the carb as opposed to regulating the fuel flow??

Thanks

Jeremy

w8ye

My Feedback: (16)

With the regulator, you use muffler pressure through a check valve to pressurize the tank and force fuel to the regulator mounted right beside the needle valve.

The regulator is a demand regulator. It passes no fuel unless the engine has a suction on the fuel inlet line.

show871

I just aquired a 120 with some hours on it. It starts and reponds well to the low end needle, but my problem is the high end needle I can go from 1.5-3.5 out with really no change in the rpms......it is all at its peak of around 9200 15x6 Ev prop. I am @ 5000 ft (it is 40deg)

It it kind of a dog on this showtime 90.........

Thanks

871

w8ye

My Feedback: (16)

It is too lean on the low end. This is restricting the top end. Make the low end a little richer

rdutari

I just got my first Saito

A beautiful Saito 100. It is waiting for a Phoenix Models Extra 330S 60 size on order from Tower.

Any recommendations on break-in? Or should I just follow the instruccions? I tried reading this thread to see if I could find something but it's ridiculously big! I tried a search and nothing. Thanks in advance!

w8ye

My Feedback: (16)

Just follow the instructions

rdutari

Thanks a lot. I'll do that. Any recommendations on what prop to use for break-in? Is it better to use one of the smaller props, or can I use a 14 X 8?

Hobbsy

My Feedback: (102)

The 14x8 is perfect.

boogermancan

http://www.youtube.com/watch?v=4hqSc6tRkcQ
i got my tango in the air got a little tape of the old sweet saito sounds rumbleing on a cold windy day

Johnny Quest

hi all i just got my first saito. a used fa 120. there is no s on it and the cylinder ribs extend over the cam block. this may help i.d. the year or model. It runs great but the compression is weak. is this normal or should i change the ring. i did adjust the valves and they seem in good order.
thanks
randall

w8ye

My Feedback: (16)

It's the early model of which there were a few variations.

You can get a ring from Frank Bowman
1211 N Allen Ave
Farmington, NM 87401-3568
505-327-0696
[email protected]

Johnny Quest

thanks i hope that will help it. its a beast compared to my os fs 90.

rexracer

Are you sure the compression is actually weak? the throttle needs to be wide open when spinning the motor to get compression. All of these Saitos feel like they have weak compression when spun with the throttle closed.

Johnny Quest

i ran it last night, its strong when wet. its an older engine and the gunk just poured out of it for 2 tanks of fuel. it sat for a few years. it definatly needs a bearing job, but a smooth runner she is. thanks.

randall

w8ye

My Feedback: (16)

johnny,

Keep in mind there were two different bearing sizes in the old style 120's