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Author Topic: Stalker 51 issue  (Read 1344 times)

Offline FLOYD CARTER

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Stalker 51 issue
« on: June 28, 2010, 05:31:32 PM »
My Stalker has a muffler that "plugs" in.  Has two "O" rings that fit well for 3 or 4 flights, then
the muffler rattles around.  The O rings are compressed and nearly gone.  Yes, I support the
rear of the muffler with a bracket that holds the stinger pipe (an extension about 2" I fastened with JB Weld).
The O rings supplied separate in the box don't last long. 

What kind of O rings should I look for?

Floyd in OR

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Online John Paris

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Re: Stalker 51 issue
« Reply #1 on: June 28, 2010, 08:29:52 PM »
Floyd,
The last batch of o-rings that I purchased from Kaz are still sitting around.  It seems that I usually get about a season out of a set.  More often than not, my muffler rear support needs to be rewrapped to keep the tension to hold the muffler in place.  I will ask my local seal expert tomorrow what he would recommend.
John
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Offline Allan Perret

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Re: Stalker 51 issue
« Reply #2 on: June 29, 2010, 07:24:00 AM »
I use Viton material which has a temp rating around 400°F.
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Offline Alan Resinger

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Re: Stalker 51 issue
« Reply #3 on: June 29, 2010, 08:06:52 AM »
Floyd,
Your earlier model 51 should use a rear mount that is very secure.  On that type muffler I usually remove the lower half of the hollow stud on the rear of the muffler so that I have a flat surface to deal with.  I then drill a hole through it for a 4-40 socket head bolt and then use a hardwood rear mount with either a blind nut or one of those brass 4-40 inserts.  Mounted this way the muffler cannot rotate as the squared off stud on the muffler is resting on the square harwood piece and is bolted to it.  If the muffler can't move your o-rings are going to last much longer and you won't have a seal problem.
Alan Resinger
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Offline Randy Powell

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Re: Stalker 51 issue
« Reply #4 on: June 29, 2010, 10:14:00 AM »
My one season experience with a Stalker 61 says the "O" rings aren't the greatest idea ever devised. I ended up using a tuned pipe connector and just tie wrapping the thing. That worked great.
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Offline WhittleN

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Re: Stalker 51 issue
« Reply #5 on: June 29, 2010, 10:52:18 AM »
Floyd

I think when all is done this is the solution.

Norm
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Offline Brett Buck

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Re: Stalker 51 issue
« Reply #6 on: June 29, 2010, 11:03:11 AM »
Quote from: FLOYD CARTER on June 28, 2010, 05:31:32 PM
My Stalker has a muffler that "plugs" in.  Has two "O" rings that fit well for 3 or 4 flights, then
the muffler rattles around.  The O rings are compressed and nearly gone.  Yes, I support the
rear of the muffler with a bracket that holds the stinger pipe (an extension about 2" I fastened with JB Weld).
The O rings supplied separate in the box don't last long. 

   This is one reason that these sorts of arrangements are non-starters for me. Even if you can figure something out, it's never going to be as bulletproof as solidly bolting it together.

     Brett
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Offline FLOYD CARTER

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Re: Stalker 51 issue
« Reply #7 on: June 30, 2010, 09:29:39 AM »
Norm W.  It looks like you have put a short tube into the engine, and connected
the muffler with a flex pipe.  Question:  How do you fix the metal tube into
the engine?  (JB Weld?).  Also, the flex coupling might have the same problem as
the O rings.  That is, heat makes them hard, and then they don't hold.

The O rings available at the hardware store do not indicate their composition.  Well, I guess
it wouldn't hurt to give it a try.  Hopefully better than the ones that came with the engine.

If all else fails, perhaps I can get the crankcase replaced, with the newer type muffler.

thanks to all.

Floyd
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Offline RandySmith

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Re: Stalker 51 issue
« Reply #8 on: June 30, 2010, 10:55:47 AM »
Quote from: FLOYD CARTER on June 30, 2010, 09:29:39 AM
Norm W.  It looks like you have put a short tube into the engine, and connected
the muffler with a flex pipe.  Question:  How do you fix the metal tube into
the engine?  (JB Weld?).  Also, the flex coupling might have the same problem as
the O rings.  That is, heat makes them hard, and then they don't hold.

The O rings available at the hardware store do not indicate their composition.  Well, I guess
it wouldn't hurt to give it a try.  Hopefully better than the ones that came with the engine.

If all else fails, perhaps I can get the crankcase replaced, with the newer type muffler.

thanks to all.

Floyd

Floyd  You do not want to use  O-Rings from the Hardware store, you need  to buy Hi Temp Viton  O-rings, these are the only ones that will hold up

Randy
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Offline Brett Buck

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Re: Stalker 51 issue
« Reply #9 on: June 30, 2010, 11:34:03 AM »
Quote from: FLOYD CARTER on June 30, 2010, 09:29:39 AM
Also, the flex coupling might have the same problem as
the O rings.  That is, heat makes them hard, and then they don't hold.

   It's really no different from a tuned pipe coupler, and those don't generally get hard. Silicone is working well withing it's capability at glow engine exhaust temperatures.  Ff you install them right, after about two heat cycles, you could probably count on it to hold without the tie-wraps. Clean everything with lacquer thinner, rough up the surface, two tie-wraps on each side, and it more-or-less glues itself to the metal. If there is *any* oil when you start, it will slip off no matter how many tie-wraps or how tight they are.

     Brett
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Offline WhittleN

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Re: Stalker 51 issue
« Reply #10 on: July 01, 2010, 06:38:40 AM »
Floyd
Exactly as Brett stated.  One side benefit is that the rear mount although recommended is not as critical to tightly affix.
Norman

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Offline Alan Resinger

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Re: Stalker 51 issue
« Reply #11 on: July 01, 2010, 12:11:07 PM »
Floyd,
Norm's engine was one of the first of the newer model Stalker 51's.  His did not have the jam nut that was on the one you got from me at the Regionals.  His 51 doesn't use o-rings on the muffler attachment.  His would not stay snug with just the screw on muffler so he cut the header pipe to the muffer in half and screwed the front half into the engine and glued it in with JB Weld.  The two parts were then joined with a piecc of silicone tubing like you would use in a tuned pipe set-up.  If you just make the rear of the muffler so that it can't twist or move left or right, your o-ring problem will be solved.  I agree with all those that say getting some Viton o-rings is a good idea.
Alan
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