1973 yamaha rt 360 build

Discussion in '2 smokers' started by crawler07, Nov 1, 2010.

  1. crawler07

    crawler07 Adventurer

    Joined:
    Oct 19, 2010
    Oddometer:
    70
    worked on the frame a bit
    [​IMG]
    #21
  2. Sniper X

    Sniper X De Oppresso Liber

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    Location:
    Central New Mexico, 7420ft above sea level
    Looking like it is coming along great!
    #22
  3. crawler07

    crawler07 Adventurer

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    Thank you Sir, I have just installed the rear wheel with a new sprocket. I dropped it a tooth due to it being geared a little low for me..
    I ordered some fork gaiters from a ttr125, I think they will work well.
    also ordered a front sprocket a gold non o-ring chain and some mesh to make a headlight guard from..And I only have a few more parts to strip in the sandblaster and then paint. And last but not least will be painting the motor (can someone suggest a paint in a spraycan for the motor??) and bore the cylinder...Im also looking for a working speedo and a tach if any one has any please PM me,,thanks
    #23
  4. crawler07

    crawler07 Adventurer

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    do you guys have any idea if their is a taper neck bearing available for these bikes??
    #24
  5. Sniper X

    Sniper X De Oppresso Liber

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    I know this is a tad late, But I asked a local 1 DAY Paint and body how much they would charge for painting a motorcycle frame gloss black with flex agent in it to allow it to be more durable, if I prepped it and they told me $40.00. I will never paint another motorcycle frame as long as I live! Shoot, the automotive paint I would use costs 80 bucks!
    #25
  6. Sniper X

    Sniper X De Oppresso Liber

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    I think you can get them at a bearing specialist if you have the dimensions of the stockers. OD ID thickness.
    #26
  7. crawler07

    crawler07 Adventurer

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    Wow, that is one hell of a deal.Unfortunately all the paint shop in my area are out of their mind asking 250.00!!
    I think my auto zone duplicolor will hold up just fine:D


    Thanks I found some on ebay for around 50.00. I will look into gettin some if I ever decide to take it apart again..


    My next big find looks like it will be a upper con rod bearing......Doesnt seem to be any out their???If anyone knows where one is please let me know......
    #27
  8. SOS

    SOS Ignorance is a gift

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    Very cool! I'm takin notes on the tank repair:deal
    #28
  9. crawler07

    crawler07 Adventurer

    Joined:
    Oct 19, 2010
    Oddometer:
    70
    havent made alot of progress,it seems the little thing consume large amounts of time.
    installed some fork boots from a ttr125 and started on a headlight mount with a little twist.
    This bike didnt come with a speedo or tach the previous owner said he lost them:cry so I had to come up with something to hold the key switch..
    [​IMG]

    [​IMG]
    the bolt holding the light bucket to the mount will be replaced by a wing nut and the light will be a quick release..

    also going to make this chain guide work, just think it looks cool:evil
    [​IMG]

    added some renthal twin tube bars and clamps.and made the turn signals work by switching the stems from side to side and making a few spacers.
    [​IMG]

    and an over all pic..
    [​IMG]
    #29
  10. crawler07

    crawler07 Adventurer

    Joined:
    Oct 19, 2010
    Oddometer:
    70
    I cleaned the center cases and had a good friend do a little powdercoating and blamo!!!!
    [​IMG]

    and the light mount is almost finished.
    [​IMG]

    Just a small list remaining.
    paint the exhaust
    install a bicycle speedo
    install chain
    build a seat pan ,cut some foam, and cover it
    make a tail light mount
    paint body work
    fix blinkers.......
    #30
  11. crawler07

    crawler07 Adventurer

    Joined:
    Oct 19, 2010
    Oddometer:
    70
    hey guys I have a question? I ordered a piston for this thing and when it got here I see that it doesnt have any ports in the skirt like the original did? So this bike also has reed valves so I dont know if I need the piston ports? Please if anyone has any insight give me a clue here.
    #31
  12. Sniper X

    Sniper X De Oppresso Liber

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    Probably for an early piston port model.
    #32
  13. Sniper X

    Sniper X De Oppresso Liber

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    I am guessing here, but I think the first few or couple eyars the 360 was out it was piston port. I seem to remember it wasn't until 1972 or 3 that it was a reed induction. I am betting they sent you a piston for the earlier model that was piston port.....but am guessing.
    #33
  14. Sniper X

    Sniper X De Oppresso Liber

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    Yep, 1972 was the first year for reed valves and that means 1968, 69, 70 and 71 were piston port.
    #34
  15. crawler07

    crawler07 Adventurer

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    thanks sniper, but I removed the original piston from the motor and the one they sent me didnt have a ported skirt. But it does have reeds, so do you think it would be ok to run the non ported piston in place of the ported one??
    #35
  16. Sniper X

    Sniper X De Oppresso Liber

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    let me do some checking....
    #36
  17. Sniper X

    Sniper X De Oppresso Liber

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    Nope, it won't work, the stock piston for yours HAS ports on the skirt, oddly enough, the one that is called piston port does not have them......
    #37
  18. crawler07

    crawler07 Adventurer

    Joined:
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    Oddometer:
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    I now have to remove the cylinder and add a few ports to the skirt of the one that is currently in their, unless you guys think it will be alright as is with the piston that doesnt have ports in it?? If I do add the ports to the piston my plan is to wrap the old piston with a piece of paper and transfer the openings to the paper and then to the new piston with a drill and a dramel...I will post pics of the process if you guys would like to see..
    #38
  19. spo123

    spo123 Man About Town

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    Oddometer:
    987
    Location:
    North Shore Mass. USA
    I think that IF you attempt to "modify" the ports into the nonport piston, you will have a NASTY surprise "down the road"!
    IF you get the machine to run decently, a seizure and or severe vibration (unless triple beam scale balanced) will occur.
    PERHAPS I am wrong......won't be the first time....
    SPEND the $325 or so and get the correct rings and the correct piston.....get the cylinder bored to match the new piston and go for a ride.
    Set the TIMING correctly......or be prepared for a seizure and another top end rebuild......I will not even mention CRANK SEALS and CORRECT carb settings!............Watch for air leaks, as well.
    The 360 is a nice motor.......Do it correctly.
    Why replace the piston?........Previous seize?..............Nasty bits can EASILY get into the lower end.......Ask my son!
    Good luck and I honestly wish you the BEST OF LUCK!
    Ride Fast and Safe!
    spo:deal
    #39
  20. crawler07

    crawler07 Adventurer

    Joined:
    Oct 19, 2010
    Oddometer:
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    Tank you for your opinion, but I have already had the cylinder bored out to fit the new piston so I think I will get this one to work. I dont see it giving me problems down the road,the piston with the ports in the skirt doesnt look any different aside fron the openings in the skirt. I looked on the inside for some type of ribbing that might have been added(for strengthening) to the piston that has the skirt openings and their isnt any and the solid skirted piston doesnt have them either. As for it having vibrations, have you ever ridden one of these? They have no counter balancer so their nasty little vibrating beasts to begin with. I only tore it down due to some piston slap the cylinder was not out of round and I only had to go half a mil over on it so I would like to keep from having to rebore it bigger.I have already added new crank seals as well as a complete engine gasket set from yamaha .I will be sure to post pics as I go and you guys can help with suggestions as I go! Thanks for your input Sir..I might also try to run it with the solid skirt piston and see how it acts, but I would like a opinion on weather or not it would hurt anything running it like that Im thinking it will just not have as much torque but to me these bikes already have alot of torque so it may be ok??...
    #40