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McCoy .19 Series 21 Needle Question Empty
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McCoy .19 Series 21 Needle Question Empty McCoy .19 Series 21 Needle Question

Post  NEW222 on Sat Dec 07, 2019 7:03 pm

Hi there. Quick question for someone that can possibly help me out with this question. Will a needle from a McCoy Red Head fit and work on a McCoy .19 Series 21? I have one that is bent in my red head, and my Series 21 did not come with one. So I was just wondering if they would interchange and work, as it would probably be easier to find a new needle for a red head over a Series 21. It appears to be the same pitch and all, just that it is bent and doesn't seat well. Or are there other differences that I had missed and or am overlooking? Thank you.
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McCoy .19 Series 21 Needle Question Empty Re: McCoy .19 Series 21 Needle Question

Post  Ken Cook on Sat Dec 07, 2019 8:42 pm

The series 21 engine line has been taken over by Mecoa. They still offer most parts for this engine. Many times the parts are out of stock. The needle valve assembly is still being offered for the .19 which fits all of the engines of this series. The redheads used the same needle valve assembly.
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Post  Marleysky on Sat Dec 07, 2019 11:08 pm

Mecoa’s web site is sometimes a bit difficult to navigate, so here is a screen shot of the needle valve and the part number.
McCoy .19 Series 21 Needle Question E3863910
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McCoy .19 Series 21 Needle Question Empty Re: McCoy .19 Series 21 Needle Question

Post  Oldenginerod on Sun Dec 08, 2019 7:10 am

The only difference with this needle is that the series 21 needle has no grooves for the clicker spring while the original Red Head one has. The clicker spring was different between the two but can interchange fine. Only problem I've found is that the needle may not hold it's position due to the lack of grooves. You need to really bend the clicker so it pressed the needle tight.
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McCoy .19 Series 21 Needle Question Empty Re: McCoy .19 Series 21 Needle Question

Post  NEW222 on Sun Dec 08, 2019 1:12 pm

Thank you. That is great news that they are indeed interchangable. This will at least help me out when looking online as I am guessing that there were a lot more red heads than the Series 21. I was honestly worried at first that the needle was propietary to the engine. Thanks again all for the help.
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McCoy .19 Series 21 Needle Question Empty Re: McCoy .19 Series 21 Needle Question

Post  GallopingGhostler on Sun Dec 08, 2019 9:43 pm

I don't know about the .19 B.H., but my .40 B.H. I've had for a long while does have knurling on the needle ring that rubs against the sheet metal tension spring. The parts diagram show the same Fuel Control Needle Valve #8900-5056 for .19-.40 B.H. Doesn't make sense that there would be no knurling, as vibration during run will cause the needle setting to shift. Also, you will see the detent in the sheet metal tension spring. Did Testors cheapen up on the needles toward the end of production? Or, did Mecoa eliminate the knurling in their parts run?

Please note, I temporarily fitted a prop drive (thrust) washer from my .35 Red Head. Basically, the Black Head and Red Head thrust washers are interchangeable.
McCoy .19 Series 21 Needle Question Testor12

McCoy .19 Series 21 Needle Question Testor13

I don't know if the same is true about the .19's. Since the B.H. part numbers are different for the .19 versus the .29 up (Prop Drive: .19 - #8900-5041, .29-.40 - #8900-5037), the .19 has it's own. I don't know if it is possible to interchange .19 BH / .19 RH prop thrust washer. (I have a .19 R.H. but not the .19 B.H.) Here is the parts diagram with part numbers:
McCoy .19 Series 21 Needle Question Mccoy_23
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Post  ticomareado on Mon Dec 09, 2019 7:23 pm

As best as I can tell all non throttle McCoy R/Hs and B/Hs .19- .40 use the same NV.
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McCoy .19 Series 21 Needle Question Empty Re: McCoy .19 Series 21 Needle Question

Post  NEW222 on Mon Dec 09, 2019 8:06 pm

Thank you.
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