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JetCat Slipping (?) Starter

Old 12-05-2022, 02:06 PM
  #26  
highhorse
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Originally Posted by Dave Wilshere View Post
This is what you get after undoing two screws No soldering needed!

Thanks for the pic Dave. That solves some mysteries for the lesser-informed among us.
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Old 12-08-2022, 03:19 AM
  #27  
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Originally Posted by A7Bldr View Post
Don, the or-ring is deeply recessed and hard to see or change from the outside. That is why the starter motor has to come out. Once out I dug my o-ring out with a sharp pick and then pushed the new one in.
I didn't realize there was a starter motor cap so I removed the whole mount, which involved unsoldering some stiff wire 'legs' from a PCB under the cowl cover and made this process a PIA..
Obviously this is not the way to go about it, but I got the job done.
My opinion. Jim
Dont feel bad Jim...you just learned how to replace a starter oring on the old style jetcat starter assembly.
Old 12-08-2022, 11:03 AM
  #28  
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MABUCHI RK-370SD-5028 DC 3V-7.4V 36000RPM High Speed Mini 24mm Electric Motor | eBay

Amazon.com : Motors RK-370SD-5028 DC3.7V-11.1V 7.4V 38500RPM High Speed Power Motor Car Boat : Electronics Amazon.com : Motors RK-370SD-5028 DC3.7V-11.1V 7.4V 38500RPM High Speed Power Motor Car Boat : Electronics

Regards,
Old 12-08-2022, 05:26 PM
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I saw those too, but there are others (many) with the same first 11 characters as a part number but varied voltages and/or KVÖSo I figured I would wait till I have tie to pull the starter out of mine and verify the part, just in caseÖalso, Mabuchi catalog doesnít even list the part number in the above, so thatís another confusing factor.

When I do verify the exact part required I will will post here.
Old 12-08-2022, 09:56 PM
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The chances of you removing the bendix from the old motor cleanly is close to zero. It’s just not practical, so save the pain and order a new assembly

Dave
Old 12-09-2022, 01:41 PM
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Remove the O-ring, then heat the lower section of the clutch and it can be pulled off.

Takes a little effort yet it is originally press-fitted anyway.

Nothing ventured, nothing gained. The unit is broken anyway, sure there is a YouTube somewhere.

Regards,

Last edited by Halcyon66; 12-09-2022 at 01:52 PM.
Old 12-09-2022, 05:01 PM
  #32  
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No one mentioned it.
The turbine is 8 years old with very little time on it. That means it sat idle for years at a time. Reach up the tail pipe (or possibly the front) with your finger and give it a good spin, It should spin freely for a bit. there could be dried oil in the bearings making it a bit stiff for the starter to get up to speed. I had this issue once when I had to postpone the hobby for 3 years. Running the pump slowly got some fresh fuel into the bearings and freed them up. Be sure to dump out the flooding before trying to start.
Old 12-09-2022, 05:12 PM
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Originally Posted by flyinfool1 View Post
No one mentioned it.
The turbine is 8 years old with very little time on it. That means it sat idle for years at a time. Reach up the tail pipe (or possibly the front) with your finger and give it a good spin, It should spin freely for a bit. there could be dried oil in the bearings making it a bit stiff for the starter to get up to speed. I had this issue once when I had to postpone the hobby for 3 years. Running the pump slowly got some fresh fuel into the bearings and freed them up. Be sure to dump out the flooding before trying to start.
My fault for not being clear, but the starter worked fine and the engine had run flawlessly just 2 weeks before this issue arose.
Old 12-09-2022, 05:14 PM
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Originally Posted by Halcyon66 View Post
Remove the O-ring, then heat the lower section of the clutch and it can be pulled off.

Takes a little effort yet it is originally press-fitted anyway.

Nothing ventured, nothing gained. The unit is broken anyway, sure there is a YouTube somewhere.

Regards,
Iíve looked for such vids but found none. Perhaps I will make one if I am successful in the repair. I will surely try the heat trick, so thanks for that.
Old 12-09-2022, 05:16 PM
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Dave Wilshire, you mentioned replacing the cable set, as the style I have is prone to issues. What are the signs of such issues please? Thanks.
Old 12-09-2022, 07:30 PM
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Originally Posted by highhorse View Post
Iíve looked for such vids but found none. Perhaps I will make one if I am successful in the repair. I will surely try the heat trick, so thanks for that.
Other makers use Bendix that have grub screws that lock them to the shaft, makes life much easier.

Regards,

Old 12-09-2022, 09:56 PM
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Originally Posted by highhorse View Post
Dave Wilshire, you mentioned replacing the cable set, as the style I have is prone to issues. What are the signs of such issues please? Thanks.
Electronic related flame outs. The fine wires take RPM and temperature information, if these break down the turbine will stop. On the ground without any G force they might run for hours and not show any issue.
Order a new starter motor and lead set, one lot of shipping and I think you will be good.
Old 12-12-2022, 07:45 AM
  #38  
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Default Jetcat starter motors

I just recently replaced these five motors to replenish my stock. I got the motors on eBay. I just searched the part number of the old motors. Those Mabuchi motors would work too.
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Old 12-12-2022, 05:06 PM
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Originally Posted by Dave Wilshere View Post
Electronic related flame outs. The fine wires take RPM and temperature information, if these break down the turbine will stop. On the ground without any G force they might run for hours and not show any issue.
Order a new starter motor and lead set, one lot of shipping and I think you will be good.
Thanks Dave!
Old 12-12-2022, 05:10 PM
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Vincent, what exact part did you get off of eBay please? I will probably go OEM but am really curious, as my own search results were less than satisfactory.

Thanks
Old 12-13-2022, 03:57 AM
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Originally Posted by highhorse View Post
Vincent, what exact part did you get off of eBay please? I will probably go OEM but am really curious, as my own search results were less than satisfactory.

Thanks
Just type in on ebay...it should be $3.25ea. The ebay link on post #28 is the place i bought my motors.

MABUCHI RK-370SD-5028 DC3V-7.4V 36000RPM High Speed Motor Embossed shaft DIY Toy


Last edited by Vincent; 12-13-2022 at 08:32 AM.
Old 12-13-2022, 11:18 AM
  #42  
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Vincent, I'll take this a stop further and ask you, are you going to 'seat' the brushes in these motors so that they last longer?
Back when I flew Speed 400 motors there was a process to seat them for best performance.
Jim
Old 12-13-2022, 12:04 PM
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Originally Posted by A7Bldr View Post
Vincent, I'll take this a stop further and ask you, are you going to 'seat' the brushes in these motors so that they last longer?
Back when I flew Speed 400 motors there was a process to seat them for best performance.
Jim
noÖi have no idea what that is and never did it. The motors last a long time as they are.

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