It was plugged in between a speedo wire and one of the wires from the main harness. Taking it out meant no change, at least I could not notice. I thought it could have been some legal speed de-restricting device used in Japan. But I spoke to a friend with TZ250 and he said, "Yep I have the same thing on my bike, but I haven't noticed that it would cause any difference.
*Scratching head* The only speed restricting device on a TZ250 is the rider ... <!-- s:roll: --><img src="{SMILIES_PATH}/icon_roll.gif" alt=":roll:" title="Rolling LoL" /><!-- s:roll: --> (Did you mean a TZR250?)
isnt it a smoothing choke or somthing? so that the coil in the clock wont snap if the battery goes wrong and puts too many volts in?
Yep, when I get home tonight. There's a name of the manufacturer on the box and the same friend has told me that they were known to make speed restricting devices back in a day when it was required by law.
Actually, the M-Max boxes were DE-restrictors, used by scoff-laws to bypass the OEM-installed electronic speed and power limiters, bringing shame and dishonour on their families and ancestors.
I meant to say de-restrictor (not sure how the speed restricting idea got into the post .... ) <!-- s:-? --><img src="{SMILIES_PATH}/icon_Eyecrazy.gif" alt=":-?" title="Eye Crazy" /><!-- s:-? --> I have no clue what is it supposed to de-restrict. Speed? How and at what speed would the restriction kick in, supposedly? As I said, two experiences same box seemingly, no effect (restriction) noticed. Hence my post ....
Well that would make sense and fit in the theory that it doesn't make any difference whether it is plugged into my bike or not .... Anyways, I put it back in today, just to make sure that some speed restriction will not kick in around 160+. I have a track day booked next week and I will need to squeeze everything out of the bike ... <!-- s:lol: --><img src="{SMILIES_PATH}/icon_lol.gif" alt=":lol:" title="Laughing" /><!-- s:lol: --> If I have time at the track, I will take the box out and do a session without it. If I don't feel a difference, it will be taken out permanently ....
The only thing electrical in the speedo is dash lights and a light that comes on when you get over 80k - it has a speed sensor switch presumably off the speedo needle to activate it. The electrical drawing shows it as a square box.
Dave, not disagreeing with you that's all mechanical off the needle. But I'd imagine the needle acts as a switch and does cuts off something somewhere .... the details of how this is done is what I was hoping for.
Have a look at the wiring diagram. It, item 17, only connects to the warning light, item 16. If you follow the three wires from the box, one is earth, one is from the dash light circuit, and the other goes to earth the speed light over 80k. Correct me if I am wrong... I won't ban you.. <!-- s --><img src="{SMILIES_PATH}/icon_biggrin.gif" alt="" title="Very Happy" /><!-- s -->
So what you and the wiring diagram are saying the bikes are really not restricted in anyway. The so called derestrictors are there to only prevent the warning light to go off??? Just for the record I have never seen any light to come on on my dash when any sort of a speed was reached .... somehow I don't get the feeling that this is sort of a restriction the manufacturer would have in mind. But who knows, maybe they did and people have been thinking all the time wrong. I wish I could say that the topic was clear and I could move one ... LOL.
A little update, perhaps. When talking about a restrictive curcuits on a bike, it's kind of useless to reference an official electric diagram issued by Yamaha. Apparently, they are known for leaving this kind of ciruitry out, for obvious reasons. It was pointed out by a friend of mine who has a decade of experience with FZR400 and the restrictive system on that bike sounds very similar to what it is probably on the 250. BTW, on the track today, I didn't have time to unplug the box and do a session without it. Plus I really couldn't get past 160, because the longest straight was not long enough for the stock gearing so I am not sure whether it would have proved anything.
Yeah I agree with Dave on this one. The FZR's have a red warning\speed light come on when you hit 80 or 100kmh. It's only to help enforce the speed limit in Japan back in the days and from memory the only restriction (if you can call it that) on the FZR's was they cut back the hp from 45 to 40hp on the 89 or 90 model FZR 250's. This light is located from memory bottom middle of your speedo, its actually embedded into your speedo cluster and has the word "speed" written under it. I'm assuming coz u have not noticed it, you or the last owner done what I did and took the globe out.
Handy hint for mystery bits... Find a part number and Google it, 9 out of 10 times it will give you the info you need. You may need to try a few combinations like manufacturer etc but it rarely fails me. Tony
