Author Topic: using an IT muffler/spark arrestor on a YZ  (Read 2251 times)

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Offline Rookie

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using an IT muffler/spark arrestor on a YZ
« on: January 19, 2015, 12:24:07 PM »
I need to find a way to quiet down this YZ100 I bought, I know that sounds strange but my neighbors will run me out on a rail if I light this thing up at the house regularly.  I plan to wrap the expansion chamber with header wrap to muffle the high pitched tings and want to replace the silencer.   I was thinking something from a IT/MX/DT125 or 175 could be made to work.  Does anyone have any opinions on what kind of a sound reduction difference that this might make?

Thanks,
Kirk


Offline 2fITy.J

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Re: using an IT muffler/spark arrestor on a YZ
« Reply #1 on: January 19, 2015, 05:18:57 PM »
SAY WHAT!?


You may find this thread I made useful.... http://www.yamahait.com.au/forum/index.php/topic,10307.0.html



Cheers,
Chris.

A bike in the bush is worth two in the shed!

BMW-BSA-Ducati-Honda-Kawasaki-Lambretta-Matchless-Norton-Suzuki-Triumph-Vespa-Yamaha.

Dirty Dozen '13 DR650SE - '90 DR650RS - '82 IT465J - '82 IT250J - '80 GT80G - '77 A100B - '76 DT100C - '76 TC125 - '75 TM75 - '73 MX80 -       '73 TC100K - '69 TC120-1

Offline Rookie

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Re: using an IT muffler/spark arrestor on a YZ
« Reply #2 on: January 20, 2015, 11:01:18 AM »
Been there, done that eh?  Where did you get that silencer you posted the pic of?  It looks like there are inserts to deflect the sound waves?  I'd like to try a db snorkel but they seem to be made of unobtanium. 

Kirk


Offline 2fITy.J

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Re: using an IT muffler/spark arrestor on a YZ
« Reply #3 on: January 20, 2015, 03:52:37 PM »
Where did you get that silencer you posted the pic of?


This one?





Spotto in a bike wreckers hangin' on the wall (is a new one)....about the $50 mark......what attracted me was the three different sized connectors (have several bikes here that may benefit)

Have seen other guys get them off ebay so they're a fairly common item. Very fruity on the 465, nice on the 250 but is louder than stock...albeit a much nicer/beefier sound.


Cheers,
Chris.

PS: I took that black wrap off last year...had too, I ruined it. Header pipe blew off the spigot out on a loop....had to use my Rossi's to get the header back on to continue....this effectively cut the wrap across the header join seams...it lasted about a week after that before it took it all off. No rust but the paint was fairly ugly. Looks fine now with a new lick of paint....and I've taken to wearing ear plugs.
A bike in the bush is worth two in the shed!

BMW-BSA-Ducati-Honda-Kawasaki-Lambretta-Matchless-Norton-Suzuki-Triumph-Vespa-Yamaha.

Dirty Dozen '13 DR650SE - '90 DR650RS - '82 IT465J - '82 IT250J - '80 GT80G - '77 A100B - '76 DT100C - '76 TC125 - '75 TM75 - '73 MX80 -       '73 TC100K - '69 TC120-1

Offline fred99999au

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Re: using an IT muffler/spark arrestor on a YZ
« Reply #4 on: January 20, 2015, 07:43:59 PM »
I took my wrap off too. Also no extra rust (well painted before the wrap) but f__k me does the wrap hide some damage.

Had a split about 3 inches long in the header along with other dings.

Offline Devondan

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Re: using an IT muffler/spark arrestor on a YZ
« Reply #5 on: January 22, 2015, 07:43:47 AM »
A 90 degree plumbing bend on the end of the silencer can quieten things down

Dan
IT  400D - Trail riding
74 Montesa Cappra - Racing
YZ250 H - Racing
Norton ES2 500 trials
Norton 250 Jubilee - Road
Norton 350 Navigator (in boxes)
Norton 350 Single M50 (in boxes)

Offline 2fITy.J

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Re: using an IT muffler/spark arrestor on a YZ
« Reply #6 on: January 22, 2015, 03:44:58 PM »
....and a 90 degree NON plumbing bend will really stifle it.  :D :D
A bike in the bush is worth two in the shed!

BMW-BSA-Ducati-Honda-Kawasaki-Lambretta-Matchless-Norton-Suzuki-Triumph-Vespa-Yamaha.

Dirty Dozen '13 DR650SE - '90 DR650RS - '82 IT465J - '82 IT250J - '80 GT80G - '77 A100B - '76 DT100C - '76 TC125 - '75 TM75 - '73 MX80 -       '73 TC100K - '69 TC120-1

Offline Rookie

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Re: using an IT muffler/spark arrestor on a YZ
« Reply #7 on: February 02, 2015, 11:55:16 AM »
The turn down idea sounds like a simple, low cost thing to try.  Any thoughts on fitting those rubber spacers between the cooling fins?

Thanks,
Kirk

Offline 2fITy.J

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Re: using an IT muffler/spark arrestor on a YZ
« Reply #8 on: February 02, 2015, 04:05:46 PM »
The fin dampeners made a difference in my test results.




Cheers,
Chris.
A bike in the bush is worth two in the shed!

BMW-BSA-Ducati-Honda-Kawasaki-Lambretta-Matchless-Norton-Suzuki-Triumph-Vespa-Yamaha.

Dirty Dozen '13 DR650SE - '90 DR650RS - '82 IT465J - '82 IT250J - '80 GT80G - '77 A100B - '76 DT100C - '76 TC125 - '75 TM75 - '73 MX80 -       '73 TC100K - '69 TC120-1