saito rebuild?
 

anybody rebuilt a saito 125 yet? i ripped the silencer out of the cylinder on mine after the elevator hinges let go on my edge 540, is it do able at home or do i need special tools?

RE: saito rebuild?
 

All you are doing is replacing the jug?

You undo four bolts to take the cylinder (Jug) off

The problem is removing the peripheral devices like valves and springs from the old cylinder

RE: saito rebuild?
 

Very do-able at home. You'll need just a couple hex wenches and a small screwdriver. I use a small surgical clamp to handle the tiny things like valve springs and the retainers, but a pair of tweezers would work fine. If you're going to remove the crank, you'll need a small puller to get the prop drive washer off. Take your time and make notes as you disassemble it so you know how to put it back together. If you have a problem just ask here.
Paul

RE: saito rebuild?
 

Send the cylinder to Clarence Lee and he'll put a threaded insert in it for around $25.

RE: saito rebuild?
 

C.F. Lee
10112 Woodward Ave.
Sunland, CA. 91040
818 352 3766

RE: saito rebuild?
 

It's a long way from Bristol on Avon, UK to Sunland, CA :p

Perhaps there is a model engineer a little closer to you who can do the insert. It's not rocket science.

RE: saito rebuild?
 

I,ve had a good look guys, i think a threaded insert, (helicoil) might not work, it would need a lot taken out of the hole before it had a clean shoulder for the locknut to tighten against. Thanks for the idea though. No, i,m gonna get a new cylinder and have a go myself, i got nothing to lose, worse case scenario i have to send it to a dealer for reassembly,lol.

RE: saito rebuild?
 

Hey double B, I went through the same when I ham fisted the threaded intake boss right off of my 1.50 cylinder. It was $114.00 lesson well learned.

RE: saito rebuild?
 

If you need any help we are here. There are several of us that can talk you through your problem whatever it may be.

RE: saito rebuild?
 

Not on that one, he won't.

RE: saito rebuild?
 

Hey Guys, I need some help. I have many Saitos and have had real good luck with 'em. However, today I had a perplexing problem..
My Fa-100 mounted upright on a Yak began making a funny noise! Removed the back cover & the bottom of the connecting rod is rubbing on the crankcase bottom!!!
The con rod bushing is tight.. The crankshaft brgs are smooth, no slack.
Wonder what happened?
Any and all help will be appreciated..

RE: saito rebuild?
 

Bad rear bearing but replace both crankshaft bearings

RE: saito rebuild?
 

Kinda figured that..reckon Horizoon/Saito in Champange will do it? I think it's still ubder warranty

RE: saito rebuild?
 

You could at least ask and see

RE: saito rebuild?
 

I don't agree with you Ace if you are saying it can't be repaired. I couldn't do it but you can have anything repaired if you have enough money. But, at what point is a new part more economical?

Bill

RE: saito rebuild?
 

Lee can't fix that one. I know. He has repaired two that I sent him. This one has the whole exhaust area torn out. Lee makes a beautiful brass adapter that fits in the old exhaust opening but it is just for engine that have had the threads stripped. One of the ones I had repaired did have about a 1/4 of the exhaust torn out but there was enough left that he could repair it using the brass adapter. This one shown has the whole opening torn away. Nothing left to hold the adapter.

RE: saito rebuild?
 

Believe it or not I just did the same thing. Thanks for the posts and recommendations. To my horror when inspecting the crash I saw the muffler lying beside the engine and thought, “Well – JB weld won’t work…” Also, I agree, that there’s got to be some meat in there to fit an insert. I am sure that this is a common thing with these motors as it is quite week in this area if it takes a good hit from a crash. I am curious if anyone in here has ever tig welded this piece back together or some other process of re-bonding the aluminum together that would hold up?

Question for you guys: Do I need to replace the piston to match the new sleeve, too? And what kind of break-in procedures will the new sleeve/Jug require?

It’s most likely looking like I’ll be out the $116.99 for a new “Jug.” http://www.horizonhobby.com/Products...dID=SAI125A01A

Thanks,

Phil

RE: saito rebuild?
 

All you need is the jug

It may be fun moving the valves over to the new jug?

RE: saito rebuild?
 

Thanks W9ye,

I want to do it right and wasn't sure... I miss this motor already. She was just broken in last year with just over 100 flights. This motor runs perfect and hopefully it'll run just as good after the repair. Oh the PAIN of sitting here staring at it, broken... [&o]

Again - I appreciate the help from everyone.

Phil

RE: saito rebuild?
 

The Saitos are pretty easy to replace the jug.

When you get the new jug, get back on here and someone will help you with getting the valves out or we can talk about it now if you want

RE: saito rebuild?
 

Maybe I'm just a cowboy but I'd run it without a muffler. They're not exactly loud even when unsilenced. And as for the mess well I fly profiles so it doesn't matter :-)

RE: saito rebuild?
 

As XJet says, you can run it without a muffler

The head is already ruined, you are not going to burn the threads

Worst case it may warp the valve.

You are not going to have muffler pressure though

RE: saito rebuild?
 

XJet - W8ye...

I may just try running this with no muffler on the test stand. I’m sure it’s still a lot quieter than many of the big gassers and 2 strokes at our field. I do like the sound of the muffler, but we’ll see if I like it more than the custom $117 muffler option.

Amazingly I was able to strip the jug clean of valves and seals within a few minutes. This is the first Saito I’ve taken apart and I am continually captivated with the mechanics of these motors. I like the idea of changing the jug and also putting some new valve springs and maybe a new exhaust valve, too.

Thanks again!

Phil

RE: saito rebuild?
 

When vyou get the new jug installed and you decide to run it with no muffler, at least have the manifold pipe in the head so it will not harm the new jug.

Keep in mind the Y-S exhaust stuff is the same size as the 125 Look at Central hobbies

RE: saito rebuild?
 

Would it make sense to attach the header pipe to the threaded flange on the new cylinder with two stout springs that would allow the exhaust system to flex in the event of a crash?