show871

So looking at the exhaust port on this one compared to your pics, would this be the newer version? kind of looks that way to me

w8ye

My Feedback: (16)

It looks that way to me also

w8ye

My Feedback: (16)

I think the ones from the factory with the new cylinder have a little "B" on the lug but you cannot count on it.

I had to work on a 125 back last Christmas and it was a "A" that someone had stuck a new "B" cylinder on it. It sure ran good.

All the boxes and literature from Horizon says "125a"

show871

Thanks for the help!

So even though the new are B models, saito packaging etc still call it the 125a?

Thanks just wanna make sure!

871

w8ye

My Feedback: (16)

That is correct

FNQFLYER

Don't you guys get Saito mounts with your big engines. Saito market a good ange of cast mounts (similar to the OS mounts) out here that work well. We don't use anything but metal mounts in any thing over say a 56 for O/T comps out here, well maybe some do but those looking for reliability and survivability don't
All the new Saito Gas engines have you beaut metal mounts that I will be using in the big models I am planning.

MAAC

Assuming your using muffler pressure of course.

w8ye

My Feedback: (16)

I use the Great Planes Adjustable plastic mounts

rambler53

My Feedback: (494)

Wow, seller was fast! Here it is.

frets24

My Feedback: (15)

You are going to enjoy that motor!! I have one that seems to find it's way back and forth between several of my planes. Still running strong on the first set of bearings after 10 years, too.

w8ye

My Feedback: (16)

This engine is not a Saito 90TS. It is a 90T which is made like a 100T but is only a 90. Looks like it has a new prop nut and washer? It doesn't have the high cam. But will run nice and smooth.

[img]{akamaiimageforum}/thumbnails/107422/Da83406.jpg[/img]

rambler53

My Feedback: (494)

Thanks, 90T it is. I hope the nut is new, the rest of the engine is also, detail didn't come through on the phone camera. It's going on a Super Skybolt. I'll bolt it to a 2X6 board and break it in, tune it, and then bury it in a cowl. The flex tube option probably has to be used for that plane to extend out of the cowl. I paid only $300 for it shipped saving about $280. His picture looks a lot better from his ad.

What is the difference between a T and TS? The rich break in step in the manual says 6000 rpm at WOT, pretty rich I'd say for ABC, but I guess Saito knows their business.

Hobbsy

My Feedback: (102)

The TS is a boxer twin, (even Firing) with each piston having its own crankpin, the T has a single crank pin and fires kinda Harley like and yet is still very smooth running. Mine is the 1.00 version but is an older model with the crankcase pump to aid in crankcase venting.

w8ye

My Feedback: (16)

Mine is the same as Hobbsy's but I removed my pump and installed new cam boxes.

You paid a fair price

nitrobeast

Hey guys,

I just took off the valve covers on my 82 and tons of oil was in them. Is that OK?

w8ye

My Feedback: (16)

It is OK

kevinkenny

Hi Guys I was given a gallon of Cool Power Heli 20% fuel and as wondering if it is OK to run in my Saito 91S. Kevin

silver.kiwi

Gentlemen,
 I would like your learned opinion on replacing the bearings on my old Saito FA-80.  The new bearings I received from Horizon are both sealed.  The original bearings are sealed front and open rear.  Should I attempt to remove the seals on the new rear bearing or leave it alone.  I'm concerned because on my older engine the crankcase vent is on the backplate and not forward between the two bearings as is the case on newer engines.  If I don't remove the seals will the cam, tappets, etc. get adequate lubrication?  Thanks for your help

w8ye

My Feedback: (16)

It doesn't much matter but I think you will be happier if you take the rear bearing shields off

Ernie Misner

>>>To prime it, open the throttle a bit and cover the exhaust pipe with your finger and turn the engine over a couple of rotations. This will create muffler pressure to push fuel into the carb. THEN apply the glow igniter and start 'er up. >>>

There's an easy way to prime the 4-strokes without having to turn the engine clear over through compression which is hard on the airframe: Open throttle full, turn prop backwards until compression begins, put finger over ehaust and turn engine frontwards until compression begins, remove finger, turn engine backwards until compression begins, put finger on exhaust, turn engine forewards until compression begins..... etc. a couple of times. Same result as turning the engine completely over through compression a couple of times BUT much easier and no strain since you are NOT turning it completely through a compression stroke.

Ernie

Ernie Misner

Don't gasoline engines run hotter than a methanol burner? Does Saito use the same exhause valve and clearances on the gassers?

Thanks,

Ernie

The Raven

I always follow the original bearings if I'm not certain. If you need to pick the seals out be careful not to damage any bearing surfaces, a pin is surprising good at piercing and levering out the unwanted shields.

w8ye

My Feedback: (16)

Yes, they generally except on the FG-30 & 36 there is a smaller exhaust valve to help make room for the NGK CM-6 spark plug.

JohnB96041

I am new to this thread, and have a question that someone will be able to answer. I have an older Saito 1.80 (nickname the Thumper). I have balanced the prop and spinner, tried different prop locations and still have an engine that has a lot of viberation. I am using a nylon mount. Any suggestions as to how to decrease or stop this? Currently, the Saito 1.80 is mounted in the Sig Spacewalker. Flys great but I am worried that the viberation will kill the airplane.

Hobbsy

My Feedback: (102)

John, what you're experiencing is more accurately called" tortional impulses" caused by a light engine, flexing mount and powerful power pulses. Set everything up as stiffly as you can, for example H9 aluminum mount, wing bolted on tightly etc.