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HelicopterEngines Plugs Mufflers Fuel › Exhaust bolts for YS91SR?
08-31-2009 09:09 PM  8 years agoPost 1
Seth Arnold

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North Port, FL

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Hey Guys,

I either misplaced my bolts, or never received them with my motor. Any idea on the size of the bolts? Thanks guys!

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08-31-2009 09:24 PM  8 years agoPost 2
JRjoe

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Jonesville , IN USA #1

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I wanta say they're 4mm. They thread right into the crankcase, right?


JRjoe.....
Indoor plumbing??? No, we don't need that!!!

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08-31-2009 09:26 PM  8 years agoPost 3
Seth Arnold

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North Port, FL

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Yeah, just the bolts that thread into the crankcase. Do you know the length by chance?

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08-31-2009 09:41 PM  8 years agoPost 4
JRjoe

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Jonesville , IN USA #1

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4x14 should be enough.

4x18 might work too.

Whatever it takes, ya know.....


JRjoe.....
Indoor plumbing??? No, we don't need that!!!

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09-01-2009 01:51 AM  8 years agoPost 5
Seth Arnold

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North Port, FL

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Those are actually too long. I found some 4mm bolts that I had laying around (roughly 18mm long) and had to cut them down to about 10mm of threads so they wouldn't bottom out in the engine.

Thanks for the help though!

Seth

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09-01-2009 01:49 PM  8 years agoPost 6
JRjoe

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Jonesville , IN USA #1

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OK, honestly i wasn't 100% sure about the length. Glad to hear you got it worked out...


JRjoe.....
Indoor plumbing??? No, we don't need that!!!

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09-01-2009 01:50 PM  8 years agoPost 7
TDriver

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Portage IN

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Whats going on Seth when did you get into heli`s.

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09-01-2009 02:08 PM  8 years agoPost 8
Buc-Le Bill

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Harleysville PA

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My YS 91ST has 3.5mm exhaust bolts, 4mm bolts don't fit.Maybe the
SR is different.
Bill

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09-01-2009 04:17 PM  8 years agoPost 9
Seth Arnold

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North Port, FL

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Hey Terry!

I've flown them the last two years. Had a Raptor 50 I got from a buddy. Finally got bored with it and decided to go bigger. Ended up getting me a T-Rex 700 Just got it built, now only needs the radio setup done in it.

Buc-Le Bill,

I'm not sure what size bolts I ended up using. They're either 3.5mm or 4mm. They fit like a glove though, just needed to be shortened so they wouldn't bottom out in the case of the engine.

Seth

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HelicopterEngines Plugs Mufflers Fuel › Exhaust bolts for YS91SR?
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