Jimmy Hoffa

My Feedback: (3)

Thanks for the heads up. It should be straight forward to file down the carb attachment point on the rear cover to line things up. I wonder why there is a variation since the cylinder, crankcase and intake manifold are the same? The good news is that it only costs $9.50. Did you say that no gasket is used between the new rear cover and crankcase?
Thanks,
Phillip

w8ye

My Feedback: (16)

I would do some careful comparisons at disassembly?

Jimmy Hoffa

My Feedback: (3)

I will before modifying anything. Does the metal rear plate require a gasket?
Phillip

w8ye

My Feedback: (16)

Yes and the part number is SAI82B32 $4.50 (out of stock)

I took the card board identification card from the back plate package and made a gasket for the back plate.

You will have to have a gasket or the back plate will hit the crankpin.

The thickness of the carb mount was .004" less than that of the plastic back plate I removed

The intake manifold position in the cylinder head was a perfect fit.

Rudolph Hart

Yes that's the one nice colour scheme too.Flying characteristic descriptions are accurate and it will do the steepest sideslips.The 30 sounds awesome in it when you see how it flys,hope one of you over there do it.Unfortunately there is no larger tri-motor version as far as i know

Craig 01

Deleted.

Craig 01

Yes,no gasket is required and i use/sealed with loctite master gasket 515.Clearance between rod bigend and crank pin to inner back plate was checked at time and sufficient clearance was measured.Compare back plates and you will clearly see the difference i noted and that the inlet tube sits further back from cylinder with 82B back plate and that is without gasket.If i remember correctly,the distance from backplate sealing flange to inner face is the same between the alloy B and plastic A and neither of both the 72A or 82A versions i have used gaskets from new.
Bye all means,check it for yourself.
There does appear to be a difference in carburettors between the A and B versions of the 82 as the part numbers of both carbs are different
"A" SAI82A831
"B" SAI91S821D
Which would account for the anomally.
82B's i've seen do not appear to have a gasket between backplate and crankcase.I could be wrong there as i have not physically had one apart.

Reason for edit:additions including master gasket type number

w8ye

My Feedback: (16)

The 72A/82A had no gasket but the "B" models do.

There's no reason why you cannot use a little Permatex anaerobic sealer there because Horizon does not have the gasket yet

Craig 01

Well there it is, as w8ye has posted,82B does have a gasket between backplate and crankcase.
Thanks w8ye.

VF84sluggo

My Feedback: (55)

Hey gang,

I'm getting a Kyosho P-51D 90 that has an OS 1.20AX in it. I LOVE my Saito 100 Hellcat! I have a McDaniels glow driver in the Hellcat, and that 100 just spins up and starts with absolutely zero fuss, and purrs like a kitten. Sounds great in-flight, too. So, I'm thinking I'd like to put a Saito in the P-51.

What would be a good size Saito to install in place of the 1.20AX? Not that the 1.20AX isn't a good motor, I've just gotten to where I really like the 4-strokes.

Thanks,
Sluggo

w8ye

My Feedback: (16)

A Saito 125

Cherokee Flyer

I just pulled the plastic one out and put the AL one in and it runs super and everything just bolted right up (with a change of carb bolts). After reading this I am not sure why.

L.

w8ye

My Feedback: (16)

If it runs good, Don't worry.

w8ye

My Feedback: (16)

If it runs good, Don't worry.

VF84sluggo

My Feedback: (55)

Thanks. I'll start looking!

RC

Cherokee Flyer

I just went and checked the plain 72 I have and it is just as I said, but at the same time as I did the plain engine, I did it to a GK that I got off the internet and it was the same way and it too runs great. Just the luck of the draw I guess.

L.

lopflyers

My Feedback: (12)

I just bought my first Saito, it is not even here yet. Its is a 100, I am planning to put on a P51 0.6. My first 4C so I am looking forward. Do I qualify for the Saito club?

lopflyers

My Feedback: (12)

BTW, I heard you need to run these motors with 30% heli fuel, any truth to this??

w8ye

My Feedback: (16)

I run 10% nitro Wildcat. Seems to run fine

VF84sluggo

My Feedback: (55)

I run Wildcat Premium Extra 15% Nitro (18% total oil) in my 100. Seems to do just fine, too...but maybe it's overkill. On the other hand, a guy in my club keeps telling me I need to be running 30% heli.

w8ye

My Feedback: (16)

Saito engines respond well to the Y-S 20-20 fuels and also the 30 Heli fuels. They just love it and it doesn't hurt them

But Saito engines run nice on 10% too and they get better fuel economy with the 10%.

If you are into 3D, maybe you want to run 30% nitro?

I have a Saito 125 on a 60 size H9 Twist and it doesn't need high nitro fuel.

VF84sluggo

My Feedback: (55)

I didn't know that...interesting.

Craig 01

They will run no different with alloy backplate or plastic.The washer on the inlet tube i spoke of keeps the o-ring sealed in cylinder inlet port against inlet tube.It is not likely the o-ring will come out of the cylinder or suffer air leaks as the alloy backplate eliminates flexing and movement in that area.If yours does snug up tight that is interesting as neither of my 72 or 82 did.And i choose to correct it to eliminate the possibility of the o-ring moving back with resultant inlet leaks.

Reason for edit:-Correction,my 72a fits up perfectly with 82b backplate.My 82a doesn't.

Jimmy Hoffa

My Feedback: (3)

I run 30% Heli in my Saito .82's and have noticed a reliable idle, quicker throttle response and about 400-500 rpm increase over 20% fuel. For sport flying 30% is probably a waste of $$$. My planes have been on the heavy side (6.5 to 7.5 lbs) and I need all the power possible for 3D hovering and decent pullout. My new project is a profile plane with an .82 that will weigh 4.5lbs and I may try a much lower nitro content fuel.
Phillip

NM2K

My Feedback: (14)

I have never ran an OS 1.20AX two-stroke, but it would have to be a real dog of an engine to be replaced by a Saito 1.25 four-stroke and still provide the model with equal performance. You sound like you're being led to the dark side by a mutual friend. (smile)

I'll say it again, you need more cubic inches in a four-stroke to equal the output of a two-stroke, not including the YS four-strokes which are supercharged (wink).

Now, if you know this fellow and he constantly flies around at 1/2 throttle or less, the Saito 1.25 might be okay.


Ed Cregger