2013 Leroy Winters Memorial ISDT Reunion Ride

[brian kirby]

No air cooled bike will pass that test if it is performed exactly as it is supposed to be done. Far too much engine rattle that is damped with water cooled cylinders. You can limit that a lot with rubber straps around the cylinder head and rubber hose in the fins, but its still not going to pass a sound test done "by the book".

Brian

[Jeff D]

Tricks from back in the day...we used to have to pass sound tests at NETRA events back at the first junior enduros in the 70s.
Rubber bands over cylinder head fins (already mentioned)
Rubber tubing (pieces of heater hose) stuffed between cylinder jug fins...or hi-temp silicone seal.
Hi-temp silicone seal at cylinder/exhaust pipe junction and pipe/silencer junction.
Airbox baffling (or temporary partial cover) to quiet intake roar, as well as seal junction between airbox and seat edges with foam and/or duct tape (think extra waterproofing)
Rubber bands over any vibrating brake return springs or other vibrating springs.
Foam between airbox and side covers.
Foam between skid plate and bottom of engine.
Innertube slid on over silencer with several inches drooping off the end...putting a washered nut and bolt through the droopy end helps aim it downward and away from meter.
If you have one of those silencers with a directional end cap, aim it down and inward towards the rear wheel, or in under the rear fender (away from dB meter)
Rubber grommet mount any vibrating metal parts such as chain guides.
Basically remove all sources of vibration or sound amplification that you can.
I'm sure there's other stuff I've forgotten over the years.

Jeff DeBell

[brian kirby]

Keeping the pipe from rattling on the manifold is a big one. My modern CR500 Honda makes a huge racket and its all from the pipe rattling on the exhaust manifold. Rubber bands/straps on the cylinder and the section of inner tube on the end of the muffler/spark arrestor will also cut large amounts of noise. Those three things will probably get most bikes really close to passing, if not passing.

Brian

[wfopete]

just dip your bike in this!

http://store.secondskinaudio.com/noise-vibration-coatings/

Pete Petrick
175 Jackpiner
Slow but Good

[Dale Fisher]

Rubber bands and fin dampeners.



Dale Fisher
Penton Owners Group - Memberships
Facebook - Cheney Twinshock Racing Group - Administrator

'70 Six-Day 125 - V2017
'71 Six-Day 125 (Dave Fisher's) - V5553
'72 Mudlark - W257
'73 Jackpiner - 175 21159727
'74 Berkshire 100 - 40171056
And some silly other bikes...

[pklinck]

Question to experiences riders, will a standard exhaust system on a cmf pass the 96db sound test for the reunion ride in August?

peter klinck

[brian kirby]

Probably, but more of an issue is engine noise, fins ringing, etc.

Brian

[Dale Sonnenschein]

It does seem diffecult to make a vintage bike meet the 96db sound limit. I'm going to give it a shot.I hope I can make it.
wfopete is right. Why is it way more expensive to ride a vintage ride? I pay 10 bucks entrance fee and 25 bucks to ride my modern bike. Seems like AHRMA is money hungry.

74 puch 175 SD
73 Husky 360 WR/RT
76 Husky WR360
75 Penton 250
10 ktm 250xc
02 bmw r1150r

[derek martin]

I'm a-thinking that the noise deal can be creatively overcome. The licensed and registered deal however can't be.  Has there been any further "interpretation" of this requirement?

[dennis brown]

i have found a way to  get ohio plates for the greeves i want to ride in mass.

dennis l.brown

[brian kirby]

Derek, get ahold of these guys, they will get you a Vermont registration which you can then transfer to Illinois.

http://www.motorecyclenow.com/title-service.html



Brian

[Rob Thatcher]

I just got my title, plate and registration from them.  Less than $250 for sales tax, title work and 1 year registration.  It only took about 3 weeks and I am very satisfied.

[derek martin]

Thanks Brian - I sent them an e-mail.

[derek martin]

Rob - are you planning on transferring the title to your home state and registering the bike there ( I'm assuming you don't live in Vermont)?

[Gordon Brennan]

Please keep in mind there are "people" who monitor sites like this. You are better off emailing each other on how to get your bikes questionably registered than discussing it here on a public forum.