The Montesa Cota 4RT Thread

Discussion in 'Trials' started by Johnnyboxer, Apr 2, 2010.

  1. Brewtus

    Brewtus Buffoonery, Inc.

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    Yeah, I got nothing on a "Pink Wire" mod. The only pink wire I see, and the only one shown on the wiring diagram goes from the ECU to the injector. Green is ground in Hondaspeak, so I have no idea what TC is talking about. As posted earlier, the thread is pretty garbled.

    BTW, the White/Green wire shows it going into pin 28 on the 2005 service manual, not pin 27. 27 shows a Black/White wire leading to the pulser coil.

    It also appears that if the lights were removed at the connector, that White/Green wire would be open anyway. With the lights connected, the White/Green feeds into the ground circuit for the lights. 28 is labeled "Map SW" so a wild guess is that another milder map is activated in the ECU when the Wh/G wire has continuity. I'll have to put a meter on mine to verify, but that is how I read the schematic.
  2. KrAzyOSUcOwBoY

    KrAzyOSUcOwBoY kRaZy

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    I am not considering any change to the exhaust restrictors. The TC thread mentions a plate on the intake side that has only a "ridiculously" small hole for the intake to flow through and the so called pink wire is disconnected only when the intake restrictor is removed. Other than regular maintenance I haven't torn into the bike and I am especially leary of messing with the EFI. My bike seems to have a small lag in the throttle just off idle that removing the INtake restrictor might fix. I agree that the TC thread is confusing, thought you guys might have some direct experience with this mod.
  3. Brewtus

    Brewtus Buffoonery, Inc.

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    All the restrictors have been removed on mine. They had been removed at set-up for the previous owner. I don't believe that I've ever ridden a restricted 4RT, since all the ones sold here had the restrictors removed at sale to run well at elevation so I have no basis of comparison on how restricted bikes run here as opposed to un-restricted ones. Heck there are times I would like a bit more zip out of mine even with my meager skills. :lol3


    FYI, I did verify that the Wh/G wire is open with the lights disconnected.
  4. BucketHead

    BucketHead Would-Be Camel Man

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    When I got my 4rt, the headlight was removed switching the map, but the inlet restrictor was still in place. This mismatch between fuelling and availiable air killed the performance.

    My advice is this: Disconnect the green headlight wire and remove the intake restrictor, and then if you want to remove the exhaust restrictors for more power. They are easy to do, especially the last one which is essentially your muffler endcap. You will have an entirely different bike.

    It is my understanding that the headlight mapping was for on-road use, and the intent was for the mapping and intake to be changed for trials use.
  5. mud

    mud I just wander.....

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    Oops! It is pin 28 on the 07 as well, I'll fix my last post.

    Mine is open as well.
  6. KrAzyOSUcOwBoY

    KrAzyOSUcOwBoY kRaZy

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    Thanks all for your replies, its beginning to make sense now.
  7. LowPSI

    LowPSI Been here awhile

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    I would leave the final exhaust tip restrictor on. Removing it makes the bike much louder and only adds 1/4 hp at full throttle. Or install a DB killer.
  8. jonnyc21

    jonnyc21 Trials Ninja

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    This is some good info, I need to check if the intake restrictor is still in mine. I got mine from the first owner without lights and don't think he ever did any modifications.

    Seeing also that I was in Seattle when I picked it up and now live in Boise it might help it run a bit more like it did down at sea level. :evil

    On a side note I have been thinking of adding a headlight back to the bike for the occasional evening trail ride... If I do (still considering it) would this mod let me keep the trials mapping and have lights?
  9. mud

    mud I just wander.....

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    If you use the factory wiring harness (which will also require the switches) it will.

    Just pull the pin at the ECU connector and you will be good to go.
  10. jonnyc21

    jonnyc21 Trials Ninja

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    Thanks for the response. Guess I need to figure out if I really want a head light now. :*sip*
  11. mud

    mud I just wander.....

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    You could also just cut the right wire in the wiring loom you put on for the lights.... We can help you with this.
  12. jonnyc21

    jonnyc21 Trials Ninja

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  13. BucketHead

    BucketHead Would-Be Camel Man

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    No pics, but none of the three are threaded.
  14. Thats_a_Five

    Thats_a_Five Adventurer

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    Yes, I had the same thing happen on mine, except I noticed the extra drag before it caught on fire. It was seriously hot though. This was on the second loop of an event right after I got my 4RT this summer.

    Fortunately, I was able to back off on the stop bolt allowing pedal to come back up a little higher. The brake pedals sometimes get bent in against the clutch cover so that the pedal does not come up fully leaving the pads in contact with the disc, creating lots of heat.

    I see that you ride up at Walker Valley. There are several guys in Puget Sound Trialers club that have 4RT's. You guys ride any PST events?



  15. turnsleft

    turnsleft Long timer

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    Wetsiderider[Dan] and BrianJones rode some of the events. Dan sold his[4RT] and Brian seems to work alot.
  16. jonnyc21

    jonnyc21 Trials Ninja

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    Just a bit before I moved to ID I picked up Higgins 07 4RT and then took it to Straddleline this year... (miss it out there already) I will have to try and make it out for at least 1 event next year if I can...
  17. brianjonesphoto

    brianjonesphoto Single Track Noob

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    Hi Captian :wave
    I'm still around, but don't have much free time to ride these days between work and baby. I am planning to hit walker tomorrow on the ol' montesa. PM me if anyone's interested.
  18. jonnyc21

    jonnyc21 Trials Ninja

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    Wish I was in Seattle still would love to ride Walker on my Montesa. Such is life...:cry
  19. jerbelgium

    jerbelgium Adventurer

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    just a short 4RT Repsol '06 question: here is one for sale, but what do I need to look for?

    any specific things that makes it a standard or Repsol (besides the stickers)?

    what about the '06 model? ok, or should I go for a newer 4RT? what are the main differences with '07,'08,'09 etc?

    thanks for your short and fast feedback
  20. johnson

    johnson Been here awhile

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    plate near headstock with number
    carbon fibre bits (headlight, fork guards, clutch cover guard...)
    programable throttle body