Author Topic: RD125/200 horn repair  (Read 286 times)

0 Members and 2 Guests are viewing this topic.

Offline Gr8uncleal

  • Club Member
  • Port Hacker
  • Posts: 2471
RD125/200 horn repair
« on: April 15, 2021, 10:45:04 AM »
I picked up a fairly cheap, non working horn with some other parts from the US (mainly bought for the nice, original clamp style mirror for my 1975 RD125) and today thought I'd have a bash at fixing it.

Luckily the horn isn't riveted or pressed, just five screws. These undid really easily, but then I was stumped for a little while. The "trumpet" came off, but I was still left with what looked like a sealed unit. After a little gentle (?) prising, it turned out that it was just the paper gasket holding the two halves together.

The inside of the horn looked like new. However, I gave the faces of the points a few rubs with sandpaper and Bob's your aunty's husband, one working horn.

Interestingly, it worked even before I fitted the adjusting screw back in.

Photos attached for the benefit of those who haven't attempted this before.   
« Last Edit: April 15, 2021, 10:50:28 AM by Gr8uncleal »
Yam RD200DX (Gr8auntiepat's)
Yam FZX700 Fazer
Yam RD400C slowly getting back to standard
Yam RD350B rough
Yam RT2 almost finished
Yam DT360A almost finished
Suzi GT550J just started
Suzi 1250 Bandit regular rider
Yam RD125(A?) in the kitchen being reassembled
Yam RD250E just started
Yam DT3 just in

Offline Astute Greaser

  • Club Member
  • Port Hacker
  • Posts: 824
  • Age: 64
  • Location: Bristol
Re: RD125/200 horn repair
« Reply #1 on: April 15, 2021, 12:29:27 PM »
Hi Alan
Going to be pain in bum  :P
The spade terminal half of horn needs rotating 180 deg. Otherwise the horn wires foul into the crook of the frame. Unless the 125 different to 200.
Note - my 200A the original horn did not have spades but had leads soldered behind a small terminal box. Pain when I swapped to later horn with spades, as had to make up new leads.
Maybe I should follow your example and fix that old one.  :-\
Cheers
-Mike

Offline Gr8uncleal

  • Club Member
  • Port Hacker
  • Posts: 2471
Re: RD125/200 horn repair
« Reply #2 on: April 15, 2021, 12:47:28 PM »
Interesting Mike.

The photo is how the horn came to me from the US and my UK RD125 horn is the same, with no fouling. However, I believe that 90 degree spade connectors are used.

Maybe I'll put my anorak on and find out which models used spade connectors and which were soldered (I know what type you're talking about there)!  :D
Yam RD200DX (Gr8auntiepat's)
Yam FZX700 Fazer
Yam RD400C slowly getting back to standard
Yam RD350B rough
Yam RT2 almost finished
Yam DT360A almost finished
Suzi GT550J just started
Suzi 1250 Bandit regular rider
Yam RD125(A?) in the kitchen being reassembled
Yam RD250E just started
Yam DT3 just in

Online pidjones

  • Club Member
  • Back Lane Scratcher
  • Posts: 390
  • Age: 68
  • Location: East TN
Re: RD125/200 horn repair
« Reply #3 on: April 15, 2021, 02:21:29 PM »
Although on some it determines if it works or not, I believe the adjusting screw is primarily to tune the frequency (or "tone") of the horn.
"Love 'em all... Let GOD sort 'em out!"

Offline Gr8uncleal

  • Club Member
  • Port Hacker
  • Posts: 2471
Re: RD125/200 horn repair
« Reply #4 on: April 15, 2021, 03:13:47 PM »
Although on some it determines if it works or not, I believe the adjusting screw is primarily to tune the frequency (or "tone") of the horn.

I bought one from the US for my GT550J that the seller said was working when he posted it. However, it didn't work here until I unscrewed the adjuster a little.

This RD200 one stopped working if I screwed the adjuster in too far.
Yam RD200DX (Gr8auntiepat's)
Yam FZX700 Fazer
Yam RD400C slowly getting back to standard
Yam RD350B rough
Yam RT2 almost finished
Yam DT360A almost finished
Suzi GT550J just started
Suzi 1250 Bandit regular rider
Yam RD125(A?) in the kitchen being reassembled
Yam RD250E just started
Yam DT3 just in