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OS 62V 4-Stroke - Muffler Pressure for Tank ?

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OS 62V 4-Stroke - Muffler Pressure for Tank ?

Old 03-17-2023, 04:20 PM
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BalsaBob
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Default OS 62V 4-Stroke - Muffler Pressure for Tank ?

The manual recommends using muffler pressure to the fuel tank. The pressure fitting on muffler is not barbed ... it is smooth. Will tubing (to go to the tank) stay secured on this fitting ???

Thanks. Bob
Old 03-17-2023, 06:54 PM
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the Wasp
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post a pic so we can see it.

Jim
Old 03-18-2023, 01:51 AM
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1200SportsterRider
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Yes, I had both the 62 V and the 95 V, the pressure line stays right there.


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Old 03-18-2023, 03:05 AM
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BalsaBob
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Okay, thanks. (but I'm still puzzled why it is not barbed ....like the fittings on the older engines).

Bob
Old 03-18-2023, 03:27 AM
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1200SportsterRider
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It would be difficult to remove that half of the mold with a barb. It would be real easy to hack that one off and install one like this.

Old 03-18-2023, 04:17 AM
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BalsaBob
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Good idea !
Old 03-18-2023, 07:37 AM
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Originally Posted by BalsaBob
The manual recommends using muffler pressure to the fuel tank. The pressure fitting on muffler is not barbed ... it is smooth. Will tubing (to go to the tank) stay secured on this fitting ???

Thanks. Bob
Why not?

I always use a sacrificial inch of fuel tubing for the connection to the muffler, so in case it burns away I do not end up with a shorter and shorter pressure line. I connect the sacrificial piece and the pressure line with a simple straight piece of 3 mm or 1/8" brass or alu tubing (whatever I have at hand). Never comes loose. The pressure is only around 50 mbar (0.7 psi) anyway, and that is nothing.
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Old 03-18-2023, 06:35 PM
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Several people at our field using those OS mufflers. Seems some have had the libe slip off.
Easy enough to be more certain it does not. Daves suggestion to trim and tap for a standard, barb fitting is a tidy solution. I have also seen a wrap of .01 to .02" safety wire around the muffler body, then neatly twisted around the pressure line. Works well.
That loss of pressure can result in a badly timed flame-out otherwise.
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Old 03-19-2023, 04:37 AM
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Wonder if a small amount of high temp automotive silicone would be enough to hold the tubing on ?
Old 03-19-2023, 05:58 AM
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It should not be needed. But there are also small wire bent hose clips availlable suitable for standard silicone fuel line.
Old 03-19-2023, 08:04 AM
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Originally Posted by 1967brutus
It should not be needed. But there are also small wire bent hose clips availlable suitable for standard silicone fuel line.

Seems the folks at our field soon discovered those wire clips did little more than actually promoting the vent line to slip off.
Without the retention barbs the clips prove to be of little use. Probably better without them.

Other than that, very minor issue,those OS "V" series engines have become very popular at our field.
Old 03-27-2023, 02:45 AM
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The OS 62-V is soon to be a 64-V, it's nearly 500 bucks though. The stroke has been increased from 20.6 mm to 21.3 mm.

Last edited by 1200SportsterRider; 03-27-2023 at 02:50 AM. Reason: Add content

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