The Montesa Cota 315 R Thread...

Discussion in 'Trials' started by Garthe, Jul 19, 2009.

  1. Dang Canadian

    Dang Canadian n00b

    Joined:
    Jan 21, 2012
    Oddometer:
    3
    She has the after-market shock spring, linkage adapters, re-valving and cnc dog legs. I upgraded to a PWK 28mm carb with a conical filter since this picture was taken. The motor has had the squash band dropped from 1.8 to .7mm, the head has been coated and same with the piston. I put boyseen reeds in her and also polished/ modified the transfer chambers in the jug. I ceramic coated the header pipe and modified the mid muffler. The flywheel has been lightened and the timing advanced 10 deg. I replaced the clutched with ones from Mitani and have polished the cage. I want to find the 300cc kit that was made for this bike but no one wants to sell it anymore :(. It is still on the original Nikasil and this year when I rebuild her I am going to port her. And I also put on a Nology 2 stroke coil with a MSD wire and a carb wing to give back the bottom end snap I lost with the carb.

    Attached Files:

  2. katfish52

    katfish52 Adventurer

    Joined:
    Sep 28, 2008
    Oddometer:
    33
    I bought my 04 last July for $3200. Was in very good condition,so I think thats a fair price.
  3. Twin-shocker

    Twin-shocker Long timer

    Joined:
    Jan 28, 2012
    Oddometer:
    1,673
    You should have more bottom end power with a PWK fitted.............try re-fitting the stock air box, and putting the timing back to standard.
  4. Dang Canadian

    Dang Canadian n00b

    Joined:
    Jan 21, 2012
    Oddometer:
    3
    The air box is too much of a pain to fit to the carb so i probably won't do that anytime soon :) Yes the jetting is a bit out but the main problem is that the engine has never been rebuilt and is now lacking compression. When she is rebuilt I will love her even more.
  5. Twin-shocker

    Twin-shocker Long timer

    Joined:
    Jan 28, 2012
    Oddometer:
    1,673
    Your bike will run poorly without the stock air box fitted, and you will need to avoid using it in serious competition, as water will get sucked into the motor very easily with a pod type filter fitted.
  6. Pasquale G. (aka KH)

    Pasquale G. (aka KH) n00b

    Joined:
    Feb 2, 2012
    Oddometer:
    4
    My Montesa baby. Did a rebuild on a few items and basically gave it a face lift. Still having trouble getting it to run with the choke off (and wow that is a royal pain getting to the fuel shut-off petcock and the choke lever.)

    Hope you guys like it!

    Attached Files:

  7. Pasquale G. (aka KH)

    Pasquale G. (aka KH) n00b

    Joined:
    Feb 2, 2012
    Oddometer:
    4
    Here is my Sherco too. A 2.9 I picked up in nevada. Was a real garage queen (flats, bad clutch, etc.) until i cleaned it up.

    Attached Files:

  8. Brewtus

    Brewtus Buffoonery, Inc.

    Joined:
    Jul 30, 2008
    Oddometer:
    3,215
    Location:
    Albuquerque, New Mexico

    :nod
  9. Dang Canadian

    Dang Canadian n00b

    Joined:
    Jan 21, 2012
    Oddometer:
    3

    Up here in Alberta if any motorbike even rides near a creek let alone in it, the rangers ticket you $2000 and can take your bike away. So no water here :'(
  10. UngaWunga

    UngaWunga Mosquito bait

    Joined:
    Jan 7, 2005
    Oddometer:
    7,970
    Location:
    NH
    Anyone have an exploded diagram of the forks? 2002 model, I believe. Mine are leaking around the bottom adjusters. Guessing that it's a problem with an o-ring or something.
  11. foroffroaduseonly

    foroffroaduseonly Adventurer

    Joined:
    Oct 23, 2008
    Oddometer:
    82
    Location:
    New Jersey
    I crashed my 2002 315r in some rocks yesterday and put a small dent in the fork tube. I know it's a longshot but Does anyone know where I could get one for less then 600$ from here http://montesacota315.com/en/parts.html ??
  12. Stumpalump

    Stumpalump Been here awhile

    Joined:
    Feb 12, 2010
    Oddometer:
    128
    Lewisports mentioned to advance the timing on the 315R. Not simple but it really picked up power from the bottom on up. What is the mid pipe or mid muffler mod?
  13. lineaway

    lineaway Long timer

    Joined:
    Oct 1, 2011
    Oddometer:
    3,266
    Location:
    nm
    Out of the crate the bikes had three restictor plates. One in the header, one in the air box, and one an insert in the end of the mid pipe. It was a reducer welded in that could be cut out. That sounds like what you are talking about. The ignition mod is just making your own slot to give yourself some adjustment to the timing.
    Just remove the muffler and look at the end of the mid-pipe it should be obvious if is stll there. I never rode one with the restrictors in place, but they had to run quite mild.
  14. walstibsf

    walstibsf ADVENTURE-HOLIC

    Joined:
    Jul 31, 2008
    Oddometer:
    212
    Location:
    Prescott, Arizona
    Hi, gang. Long time lurker, first time poster here in Trials,or 315r for that matter. Any chance "CNC doglegs" refer to the fork slider lowers? Mine on the right hand side has developed a crack just shy of the pinch bolts for the axle.

    Thanks in advance,

    Bobby
  15. walstibsf

    walstibsf ADVENTURE-HOLIC

    Joined:
    Jul 31, 2008
    Oddometer:
    212
    Location:
    Prescott, Arizona
    Well....I had the pinch section on the right lower fork leg welded by a certified aircraft welder. And it has lasted several practices and one event, so no need for a new leg at this point. I talked to Mike at the Tryals shop and he said he sees these broken all the time. He suggested two things: 1. put shims in the gap of the pinch to prevent over stressing. 2. Use loctite and don't over-torque.

    Thanks, Mike............
  16. Twin-shocker

    Twin-shocker Long timer

    Joined:
    Jan 28, 2012
    Oddometer:
    1,673
    Welding cracked fork sliders is pretty easy for anyone who can use a TIG reasonably well. But its a good idea to find something steel same diameter as the spindle, and fit that in to the spindle hole before welding using 4043 filler. Shims are a good idea, and if these are made accurately will stop cracks happening again.
  17. walstibsf

    walstibsf ADVENTURE-HOLIC

    Joined:
    Jul 31, 2008
    Oddometer:
    212
    Location:
    Prescott, Arizona
    Does anyone know the stock gearing on a '98 315R, please? # of teeth front/rear sprockets? I combed the manual I have, and they have all kinds of specs there, but not the sprocket sizes, unless I have temporary blindness, which is entirely possible!:D
  18. ridenm

    ridenm Long timer

    Joined:
    Jan 18, 2010
    Oddometer:
    2,840
    Location:
    Carnuel, NM USA
    The service data for my '99 shows a final drive ratio of 4:1 and 40/10T. I know I have a 42T rear sprocket, but I can't recall what the cs sprocket is, and the walk to the garage is very dark :eek1

    PM me and I'll send you the .jpg of specs and service data.
  19. B1

    B1 Carbon-based bipedal

    Joined:
    Jun 7, 2009
    Oddometer:
    3,493
    Location:
    Arse-trailer
    hey guys
    just read every page on this thread to brush up on the TLR260 which apparently is pretty much identical to the corresponding tessa. it probably around a 1994-1996 but we couldn't find it stamped on the bike anywhere. he said $2000 for it which probably sounds like a lot in the states but cheap here down under. just had a few quick questions....

    i'm six foot four so will have to get those bars higher. just wondering if anyone has done this and how far they could go before the cables got too tight? looks like i could get maybe two inches higher with some rerouting of cables maybe, and either go bar raisers or high bend bars?

    the plastics are a bit shabby, i doubt anyone would make aftermarket plastics for a model this old but any ideas on a supplier?

    fork seals are a bit leaky, i'm assuming it won't be too hard getting replacement seals?

    it looks pretty identical to this one except for different colors in parts of the plastics.

    [​IMG]
  20. brianjonesphoto

    brianjonesphoto Single Track Noob

    Joined:
    Feb 24, 2007
    Oddometer:
    1,576
    Location:
    The Brier Patch, WA
    That looks like a 314 not a 315. The 14 had the usd forks. Looks like a good bike regardless.