1982 XJ750 SECA 11M (UK/Europe) side stand circuit problem

Hi, all,

My recently-purchased SECA (XJ750 11M) failed the stringent Swiss inspection on several grounds, including that the side stand kill interlock didn't work.

I've spent an hour tracing wires on the wiring diagram in my Haynes manual (page 267) and find the side stand switch, but not a relay as on other models. Far as I can tell, the switch only connects to the Atari.

Does the Atari cross the signal from the switch over to the starter circuit cut-out relay somehow? I know the signal is reaching the Atari, because the LCD 'STND' indicator functions correctly.

I've modified the spring mounting to make the stand retract automatically for purposes of the inspection, but I'd really prefer to have a functioning interlock.

Suggestions, anyone?

 

From what I can see on the wiring diagram, the Side Stand Switch is connected to three places:


BlueYellow line to clutch switch
Black line to ground
GreeYellow line to the atari

I can see that the Side Stand Switch and the Side Stand Relay are connected through ground, which doesn't really offer any cutoff.
Mind you, my 750RK will still start with the side stand extended...

 

Re: 1982 XJ750 SECA 11M (UK/Europe) side stand circuit probl

On the XJ750RK, there are three wires, as you describe (Haynes manual, p. 270), but on the XJ750 (11M), there are only two.

Fun, isn't it, that there were four different variants of the XJ 750, all of which were called SECA (11M, RH, RK and RK)...

 

"Fun" indeed

Since you have the manual, check the colors going from the Switch to the Relay/Atari. Black is apparently ground in any case, and should not interfere.

 

There might be a problem with the Relay.

The SAFETY Relay ... L@@KS just like a Power Relay!

But, the SAFETY Relay is Configured Differently, ... causing a wide variety of problems if substituted with a Generic Poser Relay
+++++

The Sidestand Relay is prone to STICKING Closed when either the Internal of the Switch is contaminated, ...
or ...
The Activating Rod hangs-up due to its Travel being restricted by filth.

 

I don't have an 11M diagram, so there's a lot of guesswork here, but Yamaha is generally very consistent in their wire color choices, which should help.

How many wires does your sidestand switch have? US models have, three, both get grounded when the sidestand is up. If you have three wires as well, it's possible that one wire is used for the STND display, and the other for the safety circuit. The black wire is ground. The other two on US models are Bluy/Yellow and Green/Blue.

Second thing to check is to try tracing back from the starter solenoid. The Red/White +12V going to the solenoid should be switched through a starter disable relay. Finding that relay, and the signal wires that drive it (Black/Yellow and Light Blue on the US models) would be helpful.

 

Re: 1982 XJ750 SECA 11M (UK/Europe) side stand circuit probl

Hi,

My 82 750 is also 11m, just started the bike with side stand down and atari flashing warning. My clutch switch has been disabled whilst I source a replacement. However, I can put the bike in gear and move forward. engine does not cut out.

When I was putting the bike back together I never found any relay for the side stand, I serviced the switch and cleaned all the terminals I could find and the end result is that the atari works to warn me when stand is down! In the UK it is not a requirement for the MOT test so mine sailed through in may this year. making me a happy chappy with a new toy.

I will check with the wiring diagram that I have and compare it to the bike.

 

Hmmm... I just realized that I do have a diagram labeled XJ750(UK). If that's the same as 11M, then it does not appear that the side stand does anything but warn on these bikes. The TCI cutout is not hooked up, and the starter disable relay is only driven by the neutral switch and the clutch switch.

 

Re: 1982 XJ750 SECA 11M (UK/Europe) side stand circuit probl

Haynes, line drawings are hard work, I did a search a few months ago and found colour wiring diagrams, this shows 2 wires to the switch a black ground and a blue/green to the warning light. SQL is right there is no other link from the switch.

Try thundervalleypower.com the xj diagrams that are free to download are great at solving electrical problems.

 

The XJ750(UK) is the 11M - that's x-referenced at the beginning of the manual (which took me a month to notice). My switch has only two wires.

Good to know that I'm not crazy, and that I don't have some sort of wiring gremlin. Thanks, SQLGuy and CapnRedbeard!