Caution on Hypertech M motors

Brian Elfert · 2005-06-12T23:55:02+00:00

If you buy a Hypertech M motor system, remove the brass Kline valve and besure the factory installed the Kline valve seat O-Ring. They do notprovide a spare for this O-Ring as it is factory installed and rarely needs replacement.A flier at the Tripoli Minnesota launch on Saturday attempted a level 3cert using a brand new Hypertech M motor. Upon hitting the fire button,the fill stem dropped and the grain shattered. A hole was blown in theside of the booster when this happened.The flier completely disassembled the motor at home. He found the O-Ringwas missing. The missing O-Ring created a small nitrous leak during thefill that froze the grain. The frozen grain then shattered when fires.I had personally inspected for missing O-Rings before motor assembley, but I didn't remove the Kline vavle as that O-Ring is supposed to be factory installed and doesn't go missing.Anthony Cesaroni has already replied to the flier's email and will be saending two new grains plus O-Rings.Brian Elfert

Jun 12, 2005 45 Replies

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Brian Elfert 21 years ago

I don't recall seeing an O-Ring for the orfice in either of the two Hypertech M systems I have purchased. The owner of the Hypertech M in question didn't think he had an O-Ring for the Kline valve seal either.

Maybe this is a recent change? I'll have the owner double check his O-Ring kit.

Thanks for addressing this. We should have checked for this O-Ring but made a bad assumption that it was factory installed. Will the manual be updated to show this O-Ring for the M motor? Neither I nor the owner of this motor saw tis O-Ring in the manual.

Brian Elfert

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Jerry Irvine 21 years ago

Good advise.

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Phil Stein 21 years ago

Jerry has this thing that he has to have respond to everything. Even to the point where he'll post a followup message with nothing typed into it or just say point or whatever. My point is that Jerry is the primary cause and provider of the low s/n ratio here. I'm glad he doesn't always do it.

Jerry take your meds!!!

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Jerry Irvine 21 years ago

That's pith.

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Brian Elfert 21 years ago

A follow-up to my own post. The owner of the motor in question says he did not have an O-Ring for the Kline valve seat in his O-Ring kit. Note that this is not the Kline Valve O-Ring which he does have a spare for.

I also did not recieve a spare for this O-Ring in either Hypertek M motor I purchased.

The part number in question is HT-MKVSO-MSC.

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Jerry Irvine 21 years ago

You can do that?

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