w8ye

My Feedback: (16)

The part that goes in the cam hole is 2mm dia and the part that fits in the intake tappit guide hole is 4mm

i have one in my valve adjusting tool box that someone gave me years ago. I use it all the time. You can also use the small end of a push rod but it is not as accurate.

This cannot be used on the big Saito engines with mushroom cam followers because the tappits have to be removed from inside the cover.

JohnB96041

I have a Saito 82a four stroke engine that has about 4 seasons on it. It has now started blowing an excessive amount of oil/fuel out the exhaust while running. Have adjusted the valve clearance, using new Powermaster fuel that is 15% nitro, 18% synthetic/caster oil. Have reset the high and low needles, checked with a tachometer. Everything seems to be just right. Engines has plenty of power, idles very smoothly, transistion is smooth with no hesitation. Any suggestions would be helpful.

Hobbsy

My Feedback: (102)

http://www.rcuniverse.com/forum/m_10941986/tm.htm

Might be related to this.

earlwb

I suspect the piston ring is getting worn and thus there is more blow by and thus there is more oil coming out of the vent line.

w8ye

My Feedback: (16)

A Bowman ring has a closer end gap than a new Saito ring.

rcjunky67

Hey, how do you become a member around here?Looking at the post dates I can see that this thing has been around for some time now,and that's a relief... I've recently stepped up to my first saito 4 stroke,it's a 150s. ran it for it's break in on cool power 4stroke fuel,1 gal on test stand. using a 16x8 prop.RPM figures on my tach look right according to manual,and I'm using a 4-stoke glow plug from OS.I'm building a seagull modells ultimate 90 size bipe arf for this engine, and would like to mount it inverted. what if any issue's will I have to deal with.I'll not be using any kind of auxilliary fuel pump,and it appears that the fuel tank sit's low enough in this model that the tank plug centerline will be right at or just slightly above the centerline of the high speed needle valve assembly.So I'm not antisapating problems with fuel flow.I'd rather not see this big set of valve covers sticking out of the side of the cowl if I can help it. Even though the cowl for this plane is big enough to fit over my fat head,this motor is still gonna stick out somewhere once mounted and I'd like to keep as scale an appearence as possible.I'm sure some of you are wandering why a 150 on a 90 size plane, right? well,according to hrizon hobby,this thing has roughly the same case dimmensions as a 125, just more powerThe 125, size is at the top end of the recommended size range. And I picked this beautiful engine up on ebay for about 20% of retail, brand new never been fired perfect condition. And who amungst you,my brethren,would deny me that a little more power than needed is anything but AMERICAN !!! So thanks for any advice for a first time Saito virgin,As always i'd like to take the best care of this engine thet I can.she's definettly destined to be handed down one day...Thanks again

Rudolph Hart

...virgin???

Hobbsy

My Feedback: (102)

The ring gap would not have any effect on the quantity of oil comming from the exhaust. He says its running normal and idling well indicating a good ring seal.

Sharpeye22

My 82a has always produced a good bit more mess than my other saito engines using the same fuel, even the 72 and the 91. Ido not know why and do not care for it runs great, sounds great and does not want to quite. To me that is all that matters.

w8ye

My Feedback: (16)

The Saito 150s was derived from the Saito 120.

The Saito 125 was derived from the Saito 100.

There is a big difference in size and weight between a 150s and a 125.

rcjunky67

well, it would'nt be the first time that I've made a mistake. But I thought thats what I'd read on horizon's site when I first found this engine for sale. And with the included mount on the plane, the engine seems to fit ok.Do you think I may be making a mistake by putting this big of an engine on this plane?I dont have it completed as of yet but it seems like it will fitproperly and my distance between the cowl and spinner is gonna be right were I need it. I've ran an OS 91 inverted in an extra 300s and had no problems, but this is my first Saito and I was just curious if there was anything I'll need to deal with.thanks

w8ye

My Feedback: (16)

You get it all in there where it fits and get the plane balanced, it should fly OK

Garthwood

ull
RCJUNKY.....................i have a SAITO 100 on a .60 size UCANDO installed inverted, tank location is a bit high. I had no problems for a while. Last year i had to install a Sullivan on board glow driver because of dead sticks and loading up. I like to run my SAITOS rich. The SULLIVAN on board runs on a 4.8v ncd and is controlled by the throttle stick. The glow comes on at about two clicks on the throttle. No dead sticks anymore, problem solved. Moving the tank location is almost impossible on this model, unless doing major alterations, which is not worth it on this model.

Hobbsy

My Feedback: (102)

Garth, you should run the LS needle as lean as you can get away with and yet get a good idle and transition. The LS needle controls about 85% of the throttle range and has a huge effect on fuel economy or the lack of it. No glow driver required.

rcjunky67

thats correct,but on horizon's site it say's that the 150s is a 120 thats been bored out.looked at it again yesterday to read it again.thanks for your advice,I was just concerned about what I might expect from mounting it this way...

earlwb

I think Horizon Hobby's marketing informatrion can be misleading to someone not in the know about the engines.
The 150 was based on the old style larger 1.20 engine which has a larger crankcase than the newer 1.25 engine uses.
Like w8eye stated the 1.50 uses the old style large crankcase engine design from the old 1.20 engine, but the newer 1.25 engine is based on the smaller crankcase design that was used on the 1.00. Now then the 1.20 was never duplicated using the smaller engine crankcase designs as they  used the 1.00, 1.15 and 1.25 displacements for them. So technically their marketing information is accurate in that respect. They just don't go into detail on it.

w8ye

My Feedback: (16)

As has already be said in the previous post, Saito made the 150s Saito by essentially boring out the 120s engine. This was done in the early 90's.

Sometime around 2005, Saito brought out the 125 engine which was essentially an enlargement of the Saito 100 engine.

As it turns out, the Saito 125 has slightly more power than the Saito 120s engine which has been discontinued.

The Saito 150s has a little more power than the 125 but is a much larger engine in external physical dimensions and weight. They are both good engines.

Both engines use the same bearings and one should last as long as the other.

There is also a Saito 115 which is more or less an enlargement of the Saito 91. Therefore the Saito 115 is smaller externally and weighs less than the Saito 100.

Around 2000 Saito introduced the "72" that was smaller than the "65" but had more power and weighed less. A few years later Saito had the "82" which was the same outside as the 72 but had a bigger cylinder and more cubic inches.

In addition, there is a Saito 62 that is the external size of the Saito 56. This 62 engine replaced the larger in external dimension Saito 65 but it lacks the torque of the old 65.

In the late 90's Saito brought out the Saito 56 that was larger internally than the previous Saito 50 with more cubic inches and less weight.

Garthwood

Thanks...........will keep that in mind.

Garthwood

You are right about the crankcase size of the 120 in comparison to the new 125A. I have both of these engines. Never experienced any problems with the older 120, but the newer 125A I ran into a problem that i did not expect during break-in. There is quite a big difference between the two. I'll take the older 120 anytime. Just my opinion.

Hobbsy

My Feedback: (102)

GW, in my opinion the 1.25 is the better engine but it is a sub 9,500 rpm engine, trying to prop it faster than 9,500 is a waste of its midrange torque, likewise with trying to prop the 1.00 with a 14x6 like the .91. Even though the 14x6 is on the 1.00s prop list it ain't a good choice.

Garthwood

HB....I'm propping the 1.25a with a 15X6 Graupner 3-blade on a TF Sea Fury weighs roughly 14 lbs. No test flights until May/June. Engine still requires more running in. I'm not looking for a fast performance. This prop size i'm not sure if it will be able to do its job. Any comments are welcome.

Rudolph Hart

Keep it in mind?..it's when you can fly two minutes longer on a tank than you normally would,the engine seems to run sweeter and you can't hear a prettier sound.

blw

My Feedback: (3)

It's going to be interesting to hear what numbers you can turn with the Graupner 3 bladed prop on your 1.25. You don't have much bench time on it yet, do you?

Dad_Roman

Hey Saitoheads! I need a crankshaft for a 65. Lemme know if you have one you would part with please. I could use a rod too. Thanks

w8ye

My Feedback: (16)

http://www.horizonhobby.com/products...long-4SAI6523B