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Engine basics => Engine set up tips => Topic started by: Bill Little on March 04, 2014, 08:50:36 AM

Title: OS .35S/Jetstream muffler bolt size ???
Post by: Bill Little on March 04, 2014, 08:50:36 AM

Hi All,

On the older OS .35S engines the muffler mounts are threaded bosses in the ends of the exhaust stack.  I have a few Jetstream mufflers which attach this way.  I need to know the thread and length of the mounting bolts. 

Thanks!

BIG Bear
RNMM/AMM

Title: Re: OS .35S/Jetstream muffler bolt size ???
Post by: Dallas Hanna on March 06, 2014, 03:17:23 AM

Bill, from this post http://stunthanger.com/smf/index.php?topic=34488.0 the bolts to hold your muffler on retaining original tapped holes in engine exhaust stack is:

Edit for actual info measured from muffler.

Muffler thickness = 5mm

Extension = 14mm

Tapped hole recessed 12mm into exhaust stack

Tapped hole M2.6 x 0.45 x 5+mm deep

Bolt should be M2.6 x 0.45 pitch x 36 long

Earlier I posted a length of 41 mm long due to another poster giving 1 5/8" long.  

HH

Title: Re: OS .35S/Jetstream muffler bolt size ???
Post by: Geoff Goodworth on March 06, 2014, 04:30:09 AM

How long do they have to be?

Micro Fasateners lists M2.6 x 6, 8 and 12mm long.

Title: Re: OS .35S/Jetstream muffler bolt size ???
Post by: Bill Little on March 08, 2014, 03:27:20 AM

Quote from: Geoff Goodworth on March 06, 2014, 04:30:09 AM

How long do they have to be?

Micro Fasateners lists M2.6 x 6, 8 and 12mm long.

Hi Geoff,

According to Herbie, they need to be 36mm long.

BIG Bear
RNMM/AMM

Title: Re: OS .35S/Jetstream muffler bolt size ???
Post by: Geoff Goodworth on March 08, 2014, 04:16:00 AM

Yes Bill.  :(

When it comes to threads, fasteners, and the like, Herb is more useful than Google. H^^