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Discussion
Saito FG14 Woes
Good day gents, I have a Saito FG14 that has 3 flights plus half hour break-in.
I took off for the fourth flight and the engine started losing power after take off.. so I landed, checked out everything and tried again.. engine losing power during take off. Since, I have tested onthe ground and can't get the engine to go over half throttle before it bogs down. I checked the high speed needle and the low speed needle. NO response to the low speed needle, it goes to 1/4 open to 1/2 open before it bogs down. FUel lines are fine, no kinks or any issues. The only thing I can think off, is that the manual mentions that the vent hole on the side of the carb needs 2mm clearance from the firewall and mine is fairly close.. less than 1 mm.. any advice?? Regards, Patricio |
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Took the plane home and did some maintenance on it. The valve gaps had grown so wide that the rocker arms were clacking. So I took off the engine and put it on the bench. Adjusted the valve gaps and voila, running good again. |
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I will check the valve gap, and hopefully return the low speed needle valve to the setting it was.. I moved it quite a bit in and out...
It is a strong engine and beautiful to look at, but as anything .. it has its learning curve |
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No luck gentlemen...
Checked the valves.. they'r fine No luck with the needles, it just bogs down after half throttle. I did put washers behind the engine to free the breather hole.. no luck I think the diaphragm in the pump is not working, and hence starves the engine... Thoughts? |
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The original ignition module was bad.. replaced it
Haven't checked the timing.. Horizon is quite a bit away... |
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You need good compression. That's valve gap for a good new engine. Can you feel a good amount of compression when you flip the prop. Next is timing of the spark. You need to make sure it is firing at 28 degrees before top dead center. The CDI module is suppose to advance and retard the timing via software. When in doubt try a different module. Then comes fuel. Test stand always helps because you can actually see the fuel line. Make sure diaphram pump is working and you have no leaks. Also no fuel clog anywhere. Check the fuel filter and the tank clunk. Having the engine out of the plane really helps. |
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Well, the culprit was found!
I took the engine to our local engine guru.... after much troubleshooting, he took the carburator apart and found one of the plastic seals, the one that sits against the spring, was broken, apparently the spring pushed through (see pictures). Now, there's no such seal on the spare parts listed at Horizon... Can you help? I called Chief aircraft, where I purchased the engine but was left waiting... Thanks in advance... |
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Barring that I would send Horizon an email to inquire about either the parts or the warranty. I did some quick browse and only came up with the entire carburetor or the carb body from RC Japan. https://www.rcjapan.net/index.php?ma...je0gu8fnoc6p64 https://www.rcjapan.net/index.php?ma...je0gu8fnoc6p64 You may want to send RC Japan an email asking if they carry or can get you a set of seals. I went to this site and I found they do sell a set of carburetor seals. One of the seal looks very much like the one on your picture. However the seals set is for a FG60R3 and I don't know if that carburetor uses the same seal as your FG14. https://store.flitetest.com/saito-en...60r391/p444428 Then the last resort is if you know the material of the seal you may find some one that can copy it and cut it on a laser cutter. You can send an email to these guys and talk to them. They cut all kinds of gaskets on their laser cutter. I have given him measurements and/or DXF file and he had cut me custom gaskets. I don't know the limitation of the material he can cut though. http://icbimproducts.com/gaskets/newcart/index.php |
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The engine is new.. three flights
The ignition was DOA... |
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I don't own a Saito gasser but. I have found quite often the carburettors are not specifically made by the engine manufacturer but uses a generic carb used in other applications and brands of engines. Look carefully if you can see any part numbers/manufacturer logos/name and do a search.
This may not be the case with Saito but it won't hurt to explore. |
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