Results 1 to 45 of 45

Thread: Yoshimura tm-mjn26

  1. #1
    Junior Member Gerro's Avatar
    Join Date
    Jul 2012
    Location
    Hunter Valley
    Posts
    36
    Post Thanks / Like

    Yoshimura tm-mjn26

    Hey guys/girls

    I am looking at getting a Yoshi TM-MJN26 for my new engine (Taki 124cc 4v) and wanted to see if I can get some info, I know a few of you guys run them.

    My bike is all off-road (mx) so will it be suitable for this application and can a foam filter be used on it. I am currently running a Mikuni VM26, is this a similar physical size? It would be hugely appreciated if someone could give me some dimensions (total height, total width, inlet diameter, outlet diameter and the distance between bolt holes on the inlet manifold that comes with it).

    Does this carb have to be jetted similar to say the VM26 with pilot/main jet and needle position or is it completely different?

    Here is a link to the exact kit I am looking at:
    http://www.j-mart.biz/j-parts/index....ducts_id=19602


    Thanks in advance..

  2. #2
    Charter Member Monkiesuncle's Avatar
    Join Date
    Sep 2011
    Location
    unplugged, packed-up @ phucked off
    Posts
    1,063
    Post Thanks / Like
    The air filter off a VM26 will fit the Yoshi
    Maybe change the main jet from stock 110 to a 125
    Inlet manifold for the VM26 will work - it will just need a slight elongation ( about 2mm ) of the bolt holes on the rubber mounting that comes with the Yoshi
    Physically the Yoshi is smaller than the VM26 so it will go where a VM came from

  3. #3
    Junior Member Gerro's Avatar
    Join Date
    Jul 2012
    Location
    Hunter Valley
    Posts
    36
    Post Thanks / Like
    Quote Originally Posted by Monkiesuncle View Post
    The air filter off a VM26 will fit the Yoshi
    Maybe change the main jet from stock 110 to a 125
    Inlet manifold for the VM26 will work - it will just need a slight elongation ( about 2mm ) of the bolt holes on the rubber mounting that comes with the Yoshi
    Physically the Yoshi is smaller than the VM26 so it will go where a VM came from
    Thanks for your quick reply mate, I might look at ordering one. Does the kit come with additional jets, the one I am looking at buying is supposedly made for a 124cc.

    Thanks again

  4. #4
    Senior Member GAV's Avatar
    Join Date
    Jul 2012
    Location
    Sydney
    Posts
    511
    Post Thanks / Like
    From memory they have one or two spare jets
    Best to order a few different sized when you order the carby

    Get a few main jets and a few pilots
    MG the good old days

  5. #5
    Forum Member Mego A GO-GO's Avatar
    Join Date
    Oct 2011
    Location
    Brisbane
    Posts
    96
    Post Thanks / Like
    While on the subject of these MJN carbs what are the benefits of using one , are they easier to tune, more HP, better throttle response , more wank factor
    Cheers

  6. #6
    Senior Member Z50Jay's Avatar
    Join Date
    Oct 2011
    Location
    Brisbane
    Posts
    746
    Post Thanks / Like
    Quote Originally Posted by Mego A GO-GO View Post
    While on the subject of these MJN carbs what are the benefits of using one , are they easier to tune, more HP, better throttle response , more wank factor
    Cheers
    All of the above
    If it ain't broke fix it till it is

  7. #7
    Junior Member Gerro's Avatar
    Join Date
    Jul 2012
    Location
    Hunter Valley
    Posts
    36
    Post Thanks / Like
    I just bought the carb kit from Jparts, I had a look everywhere for the jets to suit it but could find them. I bought the one that is made for a 124cc so hopefully the jetting is close to where it needs to be..

    This is the one I ordered:
    http://www.j-mart.biz/j-parts/index....ducts_id=19602

  8. #8
    Senior Member GAV's Avatar
    Join Date
    Jul 2012
    Location
    Sydney
    Posts
    511
    Post Thanks / Like
    They perform excellent.
    The holes in the needle help to make the fuel into a mist which burns better.

    They give of very good power and are easy to tune
    MG the good old days

  9. #9
    Forum Member Mego A GO-GO's Avatar
    Join Date
    Oct 2011
    Location
    Brisbane
    Posts
    96
    Post Thanks / Like
    Quote Originally Posted by Z50j1 View Post
    They perform excellent.
    The holes in the needle help to make the fuel into a mist which burns better.

    They give of very good power and are easy to tune
    What about the difference between the YD-MJN and the TM-MJN which one of these would be the pick.
    Cheers

  10. #10
    Senior Member
    Join Date
    Sep 2011
    Location
    private
    Posts
    187
    Post Thanks / Like
    Quote Originally Posted by Gerro View Post
    I just bought the carb kit from Jparts, I had a look everywhere for the jets to suit it but could find them. I bought the one that is made for a 124cc so hopefully the jetting is close to where it needs to be..

    This is the one I ordered:
    http://www.j-mart.biz/j-parts/index....ducts_id=19602
    the carb you bought is no good . you will need to change the needle as they are imposible to tune . the carb kit that says its for the 88 is the go .i had two of them sold one and had to chane the needle in the other.
    regards troy

  11. #11
    Senior Member GAV's Avatar
    Join Date
    Jul 2012
    Location
    Sydney
    Posts
    511
    Post Thanks / Like
    Tm-mjn26mm.
    Never had to change the needle in the ones I had. On my 146 nice I was running a 22.5 Pilot and a 105 main.
    That was with a over low slung pipe
    MG the good old days

  12. #12
    Junior Member Gerro's Avatar
    Join Date
    Jul 2012
    Location
    Hunter Valley
    Posts
    36
    Post Thanks / Like
    Quote Originally Posted by cleatwoodmack View Post
    the carb you bought is no good . you will need to change the needle as they are imposible to tune . the carb kit that says its for the 88 is the go .i had two of them sold one and had to chane the needle in the other.
    regards troy
    After some advice from Cleatwood I contacted J-mart and had my order changed to the carb kit to suit the 88cc kit, I am still having trouble finding anywhere that sells the jets for this carb, can anyone point me in the right direction.

  13. #13
    Senior Member GAV's Avatar
    Join Date
    Jul 2012
    Location
    Sydney
    Posts
    511
    Post Thanks / Like
    Direct from jmart
    MG the good old days

  14. #14
    Junior Member Gerro's Avatar
    Join Date
    Jul 2012
    Location
    Hunter Valley
    Posts
    36
    Post Thanks / Like
    I can't for the life of me find them listed on either Jmart or Webike

  15. #15
    Senior Member
    Join Date
    Jun 2012
    Location
    SE QLD
    Posts
    747
    Post Thanks / Like
    Ask jmart
    64 CZ100, 64 CZ100, 67 Z50m. 67 Z50m. 67 Z50m. 72 Z50K2. 72 Z50K2. 72 Z50K2. 72 Z50K2. 72 Z50K2. 74 XR75. 75 XR75. 76 Z50J1.
    77 Z50J1. 78 Z50J1. 80 Z50JZ. 82 Z50r. 82 Z50R. 82 Z50R. 83 Z50R. 84 Z50R. 86 Z50R. 97 Z50R.
    Z50 BAJA. Z50 BAJA. 04 CRF50

  16. #16
    Life Member OCDZ50J's Avatar
    Join Date
    Oct 2011
    Location
    MT BEAUTY
    Posts
    2,513
    Post Thanks / Like
    Quote Originally Posted by Gerro View Post
    I just bought the carb kit from Jparts, I had a look everywhere for the jets to suit it but could find them. I bought the one that is made for a 124cc so hopefully the jetting is close to where it needs to be..

    This is the one I ordered:
    http://www.j-mart.biz/j-parts/index....ducts_id=19602
    How on earth do they work there currency converter??
    3300 yen is 323us dollars not $366.00. I found when paying the invoice it was all calculated on u.s dollars wtf?
    Save the monkeys

  17. #17
    Junior Member Gerro's Avatar
    Join Date
    Jul 2012
    Location
    Hunter Valley
    Posts
    36
    Post Thanks / Like
    Yeah I only used thier convertor as a guide, I really paid attention to what my final paypal invoice said in Aussie $$.

  18. #18
    Charter Member Monkiesuncle's Avatar
    Join Date
    Sep 2011
    Location
    unplugged, packed-up @ phucked off
    Posts
    1,063
    Post Thanks / Like
    Quote Originally Posted by Gerro View Post
    I am still having trouble finding anywhere that sells the jets for this carb, can anyone point me in the right direction.
    Same as VM26 jets

  19. #19
    Senior Member
    Join Date
    Nov 2012
    Location
    Rockhampton
    Posts
    687
    Post Thanks / Like
    when ordering from jmart pay in yen. (buy all means use $us to browse work out approx costs) but if you pay in $us u will get loose a bit more going yen>$US>$aus might save u 5% as there currencey converter is pretty crud and u always get teh short end of the straw

  20. #20
    Senior Member
    Join Date
    Nov 2012
    Location
    Rockhampton
    Posts
    687
    Post Thanks / Like
    so pay in paypal yen as there currency converter is much fairer and makes no difference to you

  21. #21
    Moderator MattyP's Avatar
    Join Date
    Sep 2011
    Location
    Canberra
    Posts
    5,036
    Post Thanks / Like
    Quote Originally Posted by Monkiesuncle View Post
    Same as VM26 jets
    seriously?? I had no dramas
    Life is too short for cheap carbs...

  22. #22
    Senior Member
    Join Date
    Feb 2012
    Location
    Sydney
    Posts
    539
    Post Thanks / Like
    Hi there,

    Here is a link to see how the needle atomizes the fuel. Like all carbs you will need to tune the MJN to your own application.

    Cheers.

    http://www.youtube.com/watch?v=APq5jz4T_08

    And this one.

    http://www.youtube.com/watch?v=wSgWVOa-wj0

  23. #23
    Senior Member
    Join Date
    Feb 2012
    Location
    Sydney
    Posts
    539
    Post Thanks / Like
    Quote Originally Posted by Monkiesuncle View Post
    Same as VM26 jets
    I buy my jets from these guys. Prompt postage and pay with PayPal.

    Cheers.

    http://www.pjmotorsports.com/mikuni-jets.html#main jets

  24. #24
    Senior Member
    Join Date
    Feb 2012
    Location
    Sydney
    Posts
    539
    Post Thanks / Like
    Quote Originally Posted by Mego A GO-GO View Post
    What about the difference between the YD-MJN and the TM-MJN which one of these would be the pick.
    Cheers
    The YD-MJN is a downdraught design, giving the fuel/air mixture a straighter shot at the valves. Downdraught carbs are superior to side draught for performance.

    Cheers.

    https://www.yoshimura-jp.com/en/topic/yd-mjn/index.html

  25. #25
    Senior Member GAV's Avatar
    Join Date
    Jul 2012
    Location
    Sydney
    Posts
    511
    Post Thanks / Like
    I buy my jets from showandgo in south Australia.

    The ydmjn is a hard carby to fit onto a monkey because of the angle it sits.
    The tm-mjn is the better option for a monkey bike
    MG the good old days

  26. #26
    Senior Member Z50Jay's Avatar
    Join Date
    Oct 2011
    Location
    Brisbane
    Posts
    746
    Post Thanks / Like
    You can get jets from Mikuni Oz. The pilot jets are the same as the VM 26 but the main jets are different. The main jets are the "Large Round Type" http://www.mikunioz.com/main_jets.htm
    If it ain't broke fix it till it is

  27. #27
    Junior Member Gerro's Avatar
    Join Date
    Jul 2012
    Location
    Hunter Valley
    Posts
    36
    Post Thanks / Like
    Thanks guys, I will have to order a few jets, most likely a 117.5, 120, 122.5, 125, 127.5 for the main and 17.5, 20, 22.5 & 25 for the pilot to start off with, from what I have been reading this should be in the ball park.. My engine is sitting in my bike waiting on the carb, luckily it arrived today so I will post some photos up of it when I get home.

    IMG_1165.jpg

  28. #28
    Charter Member Monkiesuncle's Avatar
    Join Date
    Sep 2011
    Location
    unplugged, packed-up @ phucked off
    Posts
    1,063
    Post Thanks / Like
    25 pilot and 125 main should suit a 124

  29. #29
    Junior Member Gerro's Avatar
    Join Date
    Jul 2012
    Location
    Hunter Valley
    Posts
    36
    Post Thanks / Like
    Carb arrived today.. Here's some pics.

    image.jpg

    image.jpg

    image.jpg

    image.jpg

    image.jpg

  30. #30
    Senior Member GAV's Avatar
    Join Date
    Jul 2012
    Location
    Sydney
    Posts
    511
    Post Thanks / Like
    You may need a swivel manifold to get it to sit where you want.
    Gcraft so one to suit
    MG the good old days

  31. #31
    Junior Member Gerro's Avatar
    Join Date
    Jul 2012
    Location
    Hunter Valley
    Posts
    36
    Post Thanks / Like
    Quote Originally Posted by Z50j1 View Post
    You may need a swivel manifold to get it to sit where you want.
    Gcraft so one to suit
    I've got a Taki swivel manifold, it would have been got to use the yoshi one but it would throw to carb out to the side.. I pulled the MJN out to see which one came in my setup and it is the 'YM' which is suited for a Monkey according to the manual, the other one 'YA' is supposedly for the APE100 and NSR100 etc. Hopefuly the 'YM' is the correct one because they are about $75 a pop on Jparts..

    image.jpg

  32. #32
    Senior Member
    Join Date
    Sep 2011
    Location
    private
    Posts
    187
    Post Thanks / Like
    hi gerro.
    that is the corect needle . i did some fine tuning on mine today witch is know on a tack 106 scut with over down pipe . im running 110 main 25 pilot and ym needle in stock clip setting and is running great . if you decide at any stage you want to try a ya needle i have two of them and would be happy to shoot one to you .
    regards troy

  33. #33
    Junior Member Gerro's Avatar
    Join Date
    Jul 2012
    Location
    Hunter Valley
    Posts
    36
    Post Thanks / Like
    Thanks heaps mate, I ordered a #120, #122.5 & #125 MJ and a #22.5 & #25 PJ from MikuniOz the other day so Hopefuly they will be here by the weekend so I can get it all set up..

    On another subject, some of you guys with Taki engine might be able to help me out. I filled the bike with engine oil based on what the manual for the special clutch specifies (800mls or 850mls if dry), the oil level was near the top of the sight glass when only 700mls had been added, I decided to add the final 100mls anyway but the sight glass in now fully submerged, is this correct?

  34. #34
    Charter Member Monkiesuncle's Avatar
    Join Date
    Sep 2011
    Location
    unplugged, packed-up @ phucked off
    Posts
    1,063
    Post Thanks / Like
    See where the oil level sits after it has been run - generally oil level should be in the top half of the sight glass when the bike is level ( not on sidestand )

    Don't use a synthetic oil for the first 1,000 km's - I use Honda GN4 in a black bottle, then Motorex after that.

  35. #35
    Junior Member Gerro's Avatar
    Join Date
    Jul 2012
    Location
    Hunter Valley
    Posts
    36
    Post Thanks / Like
    I actually drained the oil back out of it cause I thought i may have measured wrong, even after letting it drain for quite a while and tipping the bike from side to side the sight glass shown oil in the bottom 1/4 of the window. I filled it back up with exactly 800mls and the window in now submerged. As far as oil goes, I have always used a Motul mineral oil in my minibikes..

  36. #36
    British Cultural Attache darkman's Avatar
    Join Date
    Sep 2011
    Location
    South coast England
    Posts
    1,427
    Post Thanks / Like
    Its ok to run the better semi or fully syn oils in a taki motor as they have a oil filter to grab all the dirt and offer more protection, mineral oil's req spinners or sludge traps as in std honda motors but its ok as long as you change oil often. I found if you run motor up and then test level it works as oil is pushed around the motor more and not just sat in the sump, are you going to run a oil cooler??
    If you listen carefully you can hear rhubarb growingHidden Content

  37. #37
    Junior Member Gerro's Avatar
    Join Date
    Jul 2012
    Location
    Hunter Valley
    Posts
    36
    Post Thanks / Like
    For anyone interested the TM-MJN26 for 88cc comes stock with a 'YM' needle, #115 MJ & #15 PJ.

    I started my bike up today for the first time with a #125 MJ & #25 PJ and the thing seems just about spot on, will need to do a bit of testing still but there is no throttle hesitation and it revs up great.. I pulled the plug and it seems to be a nice coffe colour but I didn't do a proper plug chop..

  38. #38
    New Member
    Join Date
    Oct 2013
    Location
    Finland
    Posts
    1
    Post Thanks / Like
    Does anyone have any idea for a starting point in jetting the tm-mjn26 for a 88cc 4v +R engine?

  39. #39
    Forum Member
    Join Date
    Jul 2013
    Location
    USA
    Posts
    69
    Post Thanks / Like
    Hey Gerro what did Ya end up jetting this thing?? You stuck with the 125 MJ?

  40. #40
    P Plater
    Join Date
    Sep 2013
    Location
    Germany
    Posts
    19
    Post Thanks / Like
    Hy Guys i got some problems with my 88cc yoshihead and 24 MJN Carb can anyone help me? I started with a 90 main jet and 15 pilot jet but i guess the monkey runs to lean. Now i end up with a 100 main jet and 15 pilot but i guess its still to lean. Am i on the right way?

  41. #41
    Senior Member Tinman's Avatar
    Join Date
    Jan 2013
    Location
    WESTERN AUSTRALIA
    Posts
    394
    Post Thanks / Like
    I'm running a 26 mjn on a Taki 106 at the moment and the pilot is 27.5 and a 97.5 main it runs very well
    I haven't fine tuned it yet but good so far

  42. #42
    P Plater
    Join Date
    Sep 2013
    Location
    Germany
    Posts
    19
    Post Thanks / Like
    Hy Tinman what needle position do you running?

  43. #43
    Senior Member Tinman's Avatar
    Join Date
    Jan 2013
    Location
    WESTERN AUSTRALIA
    Posts
    394
    Post Thanks / Like
    Quote Originally Posted by Mr.Monkey View Post
    Hy Tinman what needle position do you running?
    The MJN needle height is not adjustable, I have dropped the main back to 95 also as the plug was a little black

  44. #44
    Senior Member Alfie's Avatar
    Join Date
    Aug 2015
    Location
    Kelmscott Perth
    Posts
    153
    Post Thanks / Like
    Mr.Monkey I had my taki 106 4v engine dyno jetted with the mjn 24 carb, over up zorst and they dropped the stock pilot from 25 to 17.5 and they dropped the stock main from 95 to 89.

  45. #45
    Junior Member
    Join Date
    Feb 2017
    Location
    Gold coast
    Posts
    48
    Post Thanks / Like
    I’m interested to hear your feed back on how the vm26 stacks up compared to the yoshi.
    Are you going to back to back them.?

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •