Saito 125a Crankshaft
#1
Thread Starter
Saito 125a Crankshaft
Hi Guys.
I just bought a "used" saito 125, and it was crashed on its first flight. It had only run about 10 minutes.
I thought that I had got a great deal as the engine is spotless, and brand new.
But I just noticed that the crankshaft is bent
Im visiting a friend tomorrow, and see if we can streighten up the crank, but if that fails, Ill have to get a new one.
Looking at the horizon site, I can see some leters behind the description
" AG " "AH" What does this mean ?
http://www.horizonhobby.com/products/SAI125A23
I also found on on ebay where it is called "AB" " AC"
http://www.ebay.com/itm/Brand-New-Sa...item43ba38af1c
Whats the difference ?
I just bought a "used" saito 125, and it was crashed on its first flight. It had only run about 10 minutes.
I thought that I had got a great deal as the engine is spotless, and brand new.
But I just noticed that the crankshaft is bent
Im visiting a friend tomorrow, and see if we can streighten up the crank, but if that fails, Ill have to get a new one.
Looking at the horizon site, I can see some leters behind the description
" AG " "AH" What does this mean ?
http://www.horizonhobby.com/products/SAI125A23
I also found on on ebay where it is called "AB" " AC"
http://www.ebay.com/itm/Brand-New-Sa...item43ba38af1c
Whats the difference ?
Last edited by SJN; 12-27-2013 at 02:11 PM.
#2
I don't know but $63.00 bucks is cheap for a crankshaft.The last one i bought was for an 82 i crashed,cost me $94.00 at the time.Don't forget to do the bearings as well.
#3
My Feedback: (3)
Horizon uses the letter alpha codes to indicate which engines a part will fit. Many parts are interchangeable. The 125 crankshaft codes are for the aluminum and Golden Knight engines. The Ebay codes you found are for the 82.
Here is the list: http://www.horizonhobby.com/article/...th-alpha-codes
Here is the list: http://www.horizonhobby.com/article/...th-alpha-codes
#6
My Feedback: (28)
Join Date: Jan 2004
Location: Bay City, TX
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Hi Guys.
I just bought a "used" saito 125, and it was crashed on its first flight. It had only run about 10 minutes.
I thought that I had got a great deal as the engine is spotless, and brand new.
But I just noticed that the crankshaft is bent
Im visiting a friend tomorrow, and see if we can streighten up the crank, but if that fails, Ill have to get a new one.
Looking at the horizon site, I can see some leters behind the description
" AG " "AH" What does this mean ?
http://www.horizonhobby.com/products/SAI125A23
I also found on on ebay where it is called "AB" " AC"
http://www.ebay.com/itm/Brand-New-Sa...item43ba38af1c
Whats the difference ?
I just bought a "used" saito 125, and it was crashed on its first flight. It had only run about 10 minutes.
I thought that I had got a great deal as the engine is spotless, and brand new.
But I just noticed that the crankshaft is bent
Im visiting a friend tomorrow, and see if we can streighten up the crank, but if that fails, Ill have to get a new one.
Looking at the horizon site, I can see some leters behind the description
" AG " "AH" What does this mean ?
http://www.horizonhobby.com/products/SAI125A23
I also found on on ebay where it is called "AB" " AC"
http://www.ebay.com/itm/Brand-New-Sa...item43ba38af1c
Whats the difference ?
#7
Thread Starter
Thanks.
I got my cranck straightened up using a lathe to hold and spin it around in, a micrometer guage, and steel rod inserted into the rear end of the cranck to bend it back into shape........fairly simple, and it is staight as an aroow now :-)
I wonder how it will hold up over time. I bet a bad prop strike, or small crash could easily bend it out of shape again...
I got my cranck straightened up using a lathe to hold and spin it around in, a micrometer guage, and steel rod inserted into the rear end of the cranck to bend it back into shape........fairly simple, and it is staight as an aroow now :-)
I wonder how it will hold up over time. I bet a bad prop strike, or small crash could easily bend it out of shape again...
#10
Thread Starter
Got it all put back together and installed in a 60 size cessna and fired it up.....
Hmmmm..... it would idle realy high, even with the throttle barrel completly closed.
Took the engine out again, and foud out that the washer on the intake pipe that pushes against the o-ring into the cylinder head was missing.
Im quite sure it was missing all along.....as I cant find it on the floor here anywhere where i disassembled the engine.....
Anyway, I found an oversize washer in my spare box of bits, and used my Dremel to work it down in size for a perfect fit.
Starts and runs fantastic
Now off to the field and break it in once the weather gets better
http://www.youtube.com/watch?v=k6IevgNfvVI&feature=youtu.be
Hmmmm..... it would idle realy high, even with the throttle barrel completly closed.
Took the engine out again, and foud out that the washer on the intake pipe that pushes against the o-ring into the cylinder head was missing.
Im quite sure it was missing all along.....as I cant find it on the floor here anywhere where i disassembled the engine.....
Anyway, I found an oversize washer in my spare box of bits, and used my Dremel to work it down in size for a perfect fit.
Starts and runs fantastic
Now off to the field and break it in once the weather gets better
http://www.youtube.com/watch?v=k6IevgNfvVI&feature=youtu.be
#12
Thread Starter
Hi Cobra
Are you thinking of a washer in the exhaust ?
The one I made is for the intake, and it only compresses the o-ring slightly to make a good seal. There is not enough pressure to even deform a copper or alu washer .
Are you thinking of a washer in the exhaust ?
The one I made is for the intake, and it only compresses the o-ring slightly to make a good seal. There is not enough pressure to even deform a copper or alu washer .
Last edited by SJN; 12-29-2013 at 11:30 AM.
#15
My Feedback: (3)
You are getting into an area that caused Saito 72 owners a lot of headaches. This is a point where a little flexing of the intake manifold pipe will cause that little washer to bounce a little and suck in air. This causes the engine to go lean off and on. The 72's plastic backplate flexing was the culprit for the problem. Anyway, if the engine runs anything but 100% reliable I would put a coating of RTV under that metal washer until you can order a new one. The RTV should seal it fine if you need to go that route. You may never have any problems either, so good luck.
#17
Thread Starter
hehe, thanks for the tip.
Always test the setup before leaving home.........just to be sure :-)
Love my saito 72 too...never had a problem with it, and runs like clockwork :-)
http://www.youtube.com/watch?v=wHVHlfERjQg
Always test the setup before leaving home.........just to be sure :-)
Love my saito 72 too...never had a problem with it, and runs like clockwork :-)
http://www.youtube.com/watch?v=wHVHlfERjQg