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what size screw for Super Tigre Muffler?

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what size screw for Super Tigre Muffler?

Old 03-27-2009, 04:02 PM
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outdoorhunting
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Default what size screw for Super Tigre Muffler?

Somebody out there has gotta know. I'm building a 60 size GP Extra 300 S & powering it with a Super Tigre 90. I'm using a "Bisson type" muffler & the stock muffler screws are too long ( Italian motor) If I can get the size,then I might be able to order them. I think (a guess) that I need 3.5MM by15MM. Yeah I checked out RTL Fasteners, they don't have 3.5MM. Any ideas? Thanks in advance!!
Old 03-27-2009, 06:18 PM
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aerowoof
 
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Default RE: what size screw for Super Tigre Muffler?

super tigre used to use an almost unkown thread size here in the states,british whitworth threads,not sure if /when they changed to something else
Old 03-27-2009, 06:34 PM
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R8893
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Default RE: what size screw for Super Tigre Muffler?

I have drilled out most of my ST muffler mount holes and tapped them with the next size larger American (English) sizes. 8-32 works IIRC
Old 03-27-2009, 06:38 PM
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outdoorhunting
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Default RE: what size screw for Super Tigre Muffler?

That's what I usually do. The Italian motors apparently the screw threads into the engine head. There's not enough room to drill. The screw goes through the muffler into the cylinder.
Old 03-27-2009, 07:05 PM
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Default RE: what size screw for Super Tigre Muffler?

Supertigre Engines use an 8-24 for the mufflers in everything from the 60 and up. 50 and the lower engines use 6-24. Had this problem last year. you can buy pre packaged replacements from tower for like 5 or six bucks. little bit much but it takes out all the guess work.

Hope this helps!
Old 03-28-2009, 08:55 AM
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wzak29
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Default RE: what size screw for Super Tigre Muffler?

cut the screw
Old 03-28-2009, 11:43 AM
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outdoorhunting
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Default RE: what size screw for Super Tigre Muffler?

Can't. The threads don't go all the way to the head. I could use washers, but it would look like "fido's butt".
Old 03-28-2009, 11:53 AM
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Default RE: what size screw for Super Tigre Muffler?

Try www.microfasteners.com

They seem to have 3.5mm, but only one pitch. See page 5.

Jim
Old 03-28-2009, 12:17 PM
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Clay Walters
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Default RE: what size screw for Super Tigre Muffler?

http://www3.towerhobbies.com/cgi-bin/wti0001p?&I=LXFY16

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