Anybody recognise this/know what it does?

On my 29R (similar to 31A XJ900RK but 750) I found this sensor bolted to the bottom of the head tube & keyed into the bottom yoke so it "knows" the steering angle.

I don't know if it's part of the self-cancel on signals or what, but the 900 frame doesn't have the lug to mount it & it seems illogical on a bike to base anything on steering angle since it only really applies around walking pace!



This is where it would mount on the frame if it had a lug for it



Am I just paranoid, or is Yamaha tracking where this bike went? lol :lol:

 

Ifm they ARE out to get you are you really paranoid?

 

It looks like a switch for canceling the turn signal. The "nub" on the front should make contact with part of the lower yoke when turned. Remember that you have a home market bike. Lots of urban riding there.

 

Pretty sure there are two forms of self cancelling; one when you turn and the other when a certain speed is reached. I will check mine tomorrow and come back to you.

 

Reminiscent of an old Nirvana tune that, lol.

Thanks z32800, Is it just me being forgetful or are we the only E-II owners on here currently? 8)

 

It would be really interesting if that feature was indeed added to the original "keeping track of whether the bike's moving/for how long" system. The only purpose I could see would be in a traffic situation where you're stopped, waiting to turn. Then when you do start off and turn, it could cancel when it comes back to straight ahead, mimicking the traditional mechanical canceller fitted to automobiles.

Does either of you have an owner's manual for your bike? It's probably covered in there.

 

Sadly the only official info I have on the bike is the sales brochure, and the majority of that is in Japanese anyway It probably would be covered in the owners manual but that'd be unreadable to me as well. Would be a nice thing to have though & I'd buy one if it came up!

 

I keep thinking that if I found myself in that situation I'd consider finding a local college/university that taught the language in question, and ask if they'd be inclined to translate the documents. You get english-language copies, and they get free study materials. Win-win!

Stupid question on my part, perhaps, but does that sound like a viable option for you?

 

regardless of what it does, can you move the mounting tab to the new frame?

CN

 

I can, yes but it would mean destroying the build sticker for the 900RK frame... I think if I decide I can't live without it, I'll find a way to mount it without welding the tab on, probably involving a modified Jubilee clip.

Shmuckaholic, I don't know if there's any Japanese course at the local uni but I guess I could ask... Would be interesting to know what they said about the bike when they were selling it

 

I have just checked my parts manual (Japanese) and it is unique to the 29R
Its part #29R-8255A-00 the description is in Japanese tho :-(

 

you could maybe tig weld it and cover the sticker with a wet rag to keep it cool.

CN

 

it would need to be welded right on top of the sticker though! I haven't quite the heart to destroy the frame's "heritage" just in case some time down the line someone wanted to build it back up as a 900RK. You never know (the corner of the sticker isn't damaged in the pic, it's just got dirt/grease/po's badly masked paint touchup covering it)

 

it's a 30 year old bike, I wouldn't be too worried about it myself.

CN

 

Ahh well, it's a 30 year old increasingly rare bike (both the 900RK the frame was intended for AND the bike it's going to hold off the ground ) & I'm just leaving the frame as original as possible for the benefit of anyone who may end up with it after me.

You can pull all the stickers off yours if you like but personally, things like that have meaning for me, they contain part of the history of the machine & there's no point destroying them if it can be avoided it's horses for courses really, some people like these details, others not so much...

 

but you are rebuilding a "total". in my opinion, there is no intrinsic value left and all bets are off, so to speak. build sticker be damned, make it work for you and screw the/any future owner.

CN

 

It works for me, and the frame could still go back to being a 900 in the future. it's MY frame that's wrecked not the 900

Anyway, each to their own, me? the sticker stays

 

Well if that sticker is that important this whole conversation is pointless, right?

 

Not really, the point of the post originally was to see if anyone else had one of these on their bike & to see what it did and whether it would be essential to the function of the bike or not.

It is pointless however to argue whether to leave the sticker or not, since I'm leaving it and that's the end of the conversation effectively... Unless anyone does know for a fact what it's function is/was

 

looks like you will have to get the bike back to the point you can test all the electric functions of the bike to see what doesn't work to find out what it does.

I hope I didn't ruffle your feathers too much, I was just trying to make a point about the intrinsic value of rebuilt totals.

CN

 

I agree with 750E-II_29Rbloke about the originality of these bikes. More and more we see these bikes chopped n bobbed n all kinds of mods done and thats fine but if at least some are not preserved as original we may see a day when no one will know what these bikes looked like in the "flesh". A while back one of our members came over to my place to help me with setting my carbs and the first thing he said to me when he saw my Maxim was "wow its been a long time since I saw an original Maxim" -
jst my 2c

 

Could you use a heat gun and move the sticker over a little.

 

No feathers ruffled this end! your point's valid about my bike, without matching numbers it's not a "real" one & as the replacement frame was so nice compared to what I expected to get for £58 I decided not to go the re-stamping route since there was nothing really to be gained by that apart from effectively deceiving. All I was saying was Id rather leave the sticker for if/when the frame is returned to it's "correct" bike.

I guess what I'm thinking in the long term is to hopefully find either a genuine 29R frame or a less nice 900RK frame & build the 29R into that, then rebuild the nice frame up as a 900RK (the matching engine's currently on ebay struggling to sell so I'm considering picking that up).

I'm pretty close now to being able to test it out, as you say that's probably the only way to know now since the only other person with the same model on here has looked & theirs is broken. (guess at least it answers whether the bike functions OK without it lol)

I think your laws on totalled/wrecked bikes are different. If a vehicle is "not recorded" here, then to all intents and purposes it's never officially even been in an accident. My bike's not been recorded