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Sportsman cylinder wanted...yep, another one! Babe_b10
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Sportsman cylinder wanted...yep, another one!

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Wanted Sportsman cylinder wanted...yep, another one!

Post  Robbasdog on Fri Mar 08, 2019 2:22 pm

https://www.coxengineforum.com/f4-for-sale-wanted

 Hi guys, I'm on the hunt for another new or near-new used Sportsman cylinder, with or without piston. I've just been given one (yep, GIVEN! Very Happy ) in great running condition but it has lots of broken cylinder fins Sad

Cheers,   Rob
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Wanted Re: Sportsman cylinder wanted...yep, another one!

Post  Cribbs74 on Sat Mar 09, 2019 3:37 pm

Rob,

The Sportsman cylinder is single bypass so any .15 Medallion cylinder would be a good fit. Also if you want to wake it up any .15 TD cylinder will work as well.
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Wanted Re: Sportsman cylinder wanted...yep, another one!

Post  Jason_WI on Sat Mar 09, 2019 3:45 pm

The sportsman and Olympic pistons won’t work in the wrist pin version .15 cylinders. The fit is way loose.
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Wanted Re: Sportsman cylinder wanted...yep, another one!

Post  Cribbs74 on Sat Mar 09, 2019 3:50 pm

So I guess the best bet is to grab the whole assy. Thanks Jason
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Wanted Re: Sportsman cylinder wanted...yep, another one!

Post  gkamysz on Sat Mar 09, 2019 7:12 pm

Medallion .15 cylinder thread does not match the other .15 engines!
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Wanted Re: Sportsman cylinder wanted...yep, another one!

Post  Cribbs74 on Sat Mar 09, 2019 8:35 pm

Every .15 cylinder is interchangeable within the TD, Olympic, Sportman. I really can’t see why they would have a special thread for the Medallion that shares the same case.

I don’t have a .15 Medallion but I do have .09’s in TD and Medallion and they share the same case and cylinder threads.
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Wanted Re: Sportsman cylinder wanted...yep, another one!

Post  Robbasdog on Sun Mar 10, 2019 5:25 am

Hi guys, thanks for all the info. I tried a thick-wall .15 Medallion wrist-pin cylinder on the Sportsman, and the thread was too big. Took me by surprise too, till then I thought all .15 cylinders had the same thread, but it obviously 'ain't so, Joe' ! I've already got a tatty user with an Olympic top-end so I want to keep the latest find standard, hence the search for a single bypass cylinder. Probably gonna take a while, but that's cool. Plenty of other toys to play with in the meantime  Very Happy

Cheers guys,   Rob
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Wanted Re: Sportsman cylinder wanted...yep, another one!

Post  coxaddict on Sun Mar 10, 2019 8:06 am

Just checked my Cox .15 engines and lo and behold, the thin walled TD cylinder with dual intake ports have a smaller diameter threaded portion like the Sportsman. So it is safe to say Cox enlarged the crankcase on the later models. Find an earlier thin wall cylinder and it will fit. Can't post pictures right now but will try if need be.
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Wanted Re: Sportsman cylinder wanted...yep, another one!

Post  crankbndr on Sun Mar 10, 2019 8:52 am

gkamysz wrote:Medallion .15 cylinder thread does not match the other .15 engines!


I ran into this recently, I had a Medallion crankcase assembly that needed a cyl. Bought a Medallion cyl. from Cox Int. from their last parts find and it would not screw into the crankcase. Threads were different.
Also got a .15 muffler that won't work, won't pass bottom of cyl. I still haven't figured out why.
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Wanted Re: Sportsman cylinder wanted...yep, another one!

Post  gkamysz on Sun Mar 10, 2019 9:46 am

I have a Medallion .15 and a Sportsman. The Medallion has 13/16" threads and the Sportsman 3/4". I suspect later TD.15 MKII Special also has the larger thread.

A short while later.....

I have a 3 transfer .15 cylinder I had to dig out. It does have the larger thread. Heh, I forgot I had a ~20 Medallion .15 piston/cylinder sets, but they are all 13/16.
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Wanted Re: Sportsman cylinder wanted...yep, another one!

Post  Cribbs74 on Sun Mar 10, 2019 1:03 pm

Well I’ll be darned. Good info, I had no idea.
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Wanted Re: Sportsman cylinder wanted...yep, another one!

Post  Robbasdog on Tue Mar 19, 2019 7:48 am

Howz this for a theory...Two Cents ...the 1961 TD.15 used the same cylinder as the Olympic (and Sportsman, minus a bypass flute) with a 3/4"-32 thread. When the cylinders cracked at the ports, a fix was needed. The Special .15 came out in '62 with thicker cylinder walls and a larger 13/16"-32 threaded neck, and if the info on M-H Tools site is right, that's the same year the Medallion .15 hit the market too, so of course it would have the larger-threaded Special .15 c'case.
  Nice theory, I think, makes sense--doesn't mean it's right, though..anybody gotta better one?
                So, does anyone actually own a thin-wall Medallion .15 that they bought new in 1961??
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Wanted Re: Sportsman cylinder wanted...yep, another one!

Post  gkamysz on Tue Mar 19, 2019 8:05 am

That's very reasonable.
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Wanted Re: Sportsman cylinder wanted...yep, another one!

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