GMS 120 A Look Inside: I Got Screwed!
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- เผยแพร่เมื่อ 10 ก.ย. 2024
- A recent very poor purchase. A good opportunity to to show others what to watch for.
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david i just broke down a saito fa 125 cleaned it reassembled it and saw the intake valve spring was fully extended can't adjust the valve because the rocker arm is sitting on the push rod and the valve is inside the port any idea how to fix my problem
I have ought quite a few engines from rcgroups, all were exactly what I expected except one. It was basically a totally destroyed 61FSR ringed. The top of the piston was concaved and pitted and the sides edges of it were scored down over the ring.. I got my money back and as you said, I will never buy from him again... If I am buying a "Chinese" or other than a Japan engine I will more than likely buy them NIB.
sad part is somebody knew that piston was broke because somebody opened that engine and removed the broken piece before it was sold to you, i would be pretty upset regardless of what i paid, basically junk
Hi, can someone tell me what the remote needle valve is for? My engine is missing one, but i can see that there would have been one. Is it necessary for the engine operation?
I bought a zebra T4 60 engine from a guy on eBay and offered him $150 + shipping for it, said he did not know anything about it and was as-is-where as basis. He said he wound let it go for $175. So I paid, when I got it, compression is good and rotary valve works good but at TDC, its hard to rotate the shaft to bring the piston down, maybe excessive wear on the conrod? Have not opened it as some of the screws have their hexes arounded. seller said he would give me $25 but never did, he kept making excuses as how he was not able to refund me through PP. anyway I could not return the engine so am stuck with it, will open it and clean it eventually, until I am able to parts for it or another for a good price. THANKS for sharing this, we have been there as well. learn from it, what can one do, some engines are darn hard to find and you sometimes jump on one risking it all cause you believe there is a chance that it will work out or pan out as planned.
On that 120 could you turn the piston 180 so you are closing off the exhaust port in kart racing engines we have a gap in the side of piston for porting tranfer
It will still upset the intake timing, Its still releasing the crankcase pressure that the engine need to operate correctly. I have change the port timing with a piston on a 2 stroke many times. Some of the pistons had a "window" in the skirt for induction timing. I believe all thoughs were piston port (no reed valve) engines. I always favored a reed valve engine because you could get so much more torque out of them.
Been there, done that. That sucks! I use to buy old used engines like this to clean up and use but found it just not worth it. I’ve since I become very picky when buying engines. They must be new or near new. Ringed are a safer bet than abc too.
Would it run if you put the piston in rotated 180 degrees
No, that puts the ring gap directly in a port.
Mike Eiben,
Why in the hell would you do that????? 700-2000+ dollars in an aircraft? Hell no!
Its got Sub Piston Induction, just like an old Cox 049 now LOL
Hey Dave, you most likely can just turn that piston 180 degrees, and the break-out will be facing the transfer ports. No problem except for of course a slight disturbance in the balance. The securing pin for the ring should still be in a good location (the slot riding one of the dams between the ports).
That carb that came with the engine, it looks more like an ASP carb to me, to be honest.
No I verified that the piston ring pin falls right in the middle of a port.
Aw, dang.... then indeed you got screwed.... :(
Sort of. You will see. I cannot reveal why at this time....
OK, I'll patiently wait...
About to upload the answer.....
A friend of mine has this same engine and needs a ring , can you give me a link or some information on where to purchase one please, thanks Chad
Contact Bjorn Ball at this email address, rmjmachineworx@gmail.com. He took over making rings for Frank Bowman.
David McIntire ok thanks we will give it a shot.
Looks like the motor equal to that Mirage 2000 EDF the boys in Slovenia bought!
Hmmm, could be. I have not seen that video.
th-cam.com/video/ZeNApwWHoXE/w-d-xo.html
th-cam.com/video/ZeNApwWHoXE/w-d-xo.html
It's a real hoot!
Auuuu that is balls!!!!
I always buy used engines thru ebay or amazon. Ebay has really stepped up their game. I bought a .68 Magnum 2C and i was so happy at how it felt. It was an ABC, tight at the top of the stoke, smooth rotational operation. This was all with no glow plug installed. I ALWAYS take my used engines apart for inspection and cleaning. I believe this seller was a consignor. They were more than accomodating. But always send defective or broken items back thru ebay. To the point,
When I disassembled the engine I was blown away.
1. The top of the piston had an arrow scratched into it and absolutley no carbon in the "arrow" or on the side of the piston where they scatched the removed the wrist pin that was broken in half inside of the small end or the rod..
2. The big end of the rod was damaged as well as the crankcase where debris went thru the engine.
3. The piston and head hammered on the top end from debris.
4. The piston had a gouge down the side opposite the exhaust port that was so deep I would never use a piston in such shape in a car engine. Passenger and definetly not a race engine.
5. The seller i buy from all the time and will continue to do so.
6. The Bastard that trie to go thru a cosignor........ Karma is a Bitch!
Damn.
Ya hate to see it.
I only buy threw eBay ,With eBay they offer Money back gaurantee.
If you still have it, reach out to me and I will machine you a new piston.
I don't mean to say that you can't do it but aren't pistons not a perfect circle but slightly oval to allow for expansion which means one can't conventionally machine a new one?
I'm sorry to see this Dave. I guess it's bound to happen. I think the remote nva should be mounted horizontally rather than vertically as it is .
I had a GMS that came on a Sig Kadet Senior. That engine was junk.
Well despite your experience, I have had great experience with all 6 of the GMS engines I have owned.
had that crap happen to me as well. SUCKS
That's a shame. He knew when selling it that it must have been broken.
Good reason not to buy used engines period, not worth the time effort and frustration
Oh but how wrong you are. Out of the 100+ USED engines I have bought over the past 3 years only 2 have been duds. I have saved a TON of money buying used. Besides you cannot find nearly any of the engines I have on my channel new anymore. They aren't made anymore. Limiting yourself to what is only currently produced leaves you with nothing but crap for engines. Part of the point of my channel is to educate and show people how to buy, refurbish and operate used engines. I guess you are missing the point of my channel.
You can find great engines for pennies on the dollar, because someone else doesn't want to take the time to do a little maintenance. A little cleaning and lubrication can produce a great engine with no parts needed. Thanks David!