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Rd400 horn is so weak

Started by rd400greenhorn, June 28, 2021, 06:56:42 AM

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rd400greenhorn

Yes so my brand new horn.. Hardly says anything on a fully charges battery.

Why? 🤔

paul1478

I have messed with the bolt that hold the face on and it will change a little but not much.
I want a horn like I have on my Goldwing.
76 Team Scream RD400
1993 FJ1200
2006 Goldwing
2022 Ducati V2 Panigale

pidjones

#2
Quote from: paul1478 on June 28, 2021, 08:05:17 AM
I have messed with the bolt that hold the face on and it will change a little but not much.
I want a horn like I have on my Goldwing.
I'd like the same. At least to have one of the two tones. Thinking of trying GL1800 breakers.

BTW, there is an adjustment screw on the back that you can use to vary the frequency a bit.

Sent from my moto g power (2021) using Tapatalk
"Love 'em all.... Let GOD sort 'em out!"

1976RD400C

'76 RD400 green  '76 RD400 red   '84 RZ350

Clem710

Jump it straight to a battery to see if it makes real noise without any of the circuitry.  I'd think a new horn should be loud as F.  I've got quite a few old ones lying around here and they have to be pretty trashed before theyre not loud.  Air horns typ need a relay iirc.

If youd rather, or if its easier, press the button and measure V at the horn, compare to what the battery reads, could be losing juice on the way.  Straight to the battery with a good connection eliminates all guessing about how loud it should be.

pidjones

You might need to cobble a bracket and it won't look exactly the same, but GL1800 horns are loud and plentiful on ebay.
"Love 'em all.... Let GOD sort 'em out!"

quocle603

Connect it directly to a battery to see if it will "honk". If not, then do what PID suggested, the screw will adjust the contact breaker and impact the sound. 
Do not underestimate the power of a two-stroke.

1975 Yamaha RD350 (modified), 1973 Yamaha RD350 (stock), 1971 Suzuki T500, 1981 Yamaha XS650 HS2, 1982 Honda MB5, 1980 Puch Maxi, 1979 Puch Magnum, 1993 Tomos Bullet, 2003 Malaguti Firefox F15 LC

pidjones

A modification that I did not make to my original RD (in the 70's) was a louder horn. It would have just alerted Charleston drivers to nearby prey, anyway. Now they occasionally cause a driver to look up from whatever they are doing that is obviously NOT driving. The original Yamaha horn is barely more than a scooter horn. So, I went with a horn demonstrated to get attention - one from a GL1800 GoldWing! Was able to use the same bracket and wire connectors, but bent the bracket about 5 degrees more to clear a sound short to the frame.
"Love 'em all.... Let GOD sort 'em out!"