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Thread: 1986 atc 250r transmission upgrade?

  1. #1
    Join Date
    Jan 2006
    Location
    Huntersville, NC
    --
    106

    1986 atc 250r transmission upgrade?

    I have just picked up my 2nd atc250r parts engine, I am catalogging all the parts I've purchased and I have found that one of my shift drums are thinner and also found an extra shaft with 3 forks on it.

    I am confused, It looks as though (from other pics) this thinner one is from a banshee or trx250r but I dont know.

    Is there a site that describes in depth the 250r trans? Or can anyone shed some light on my confusion.
    10 Buy it
    20 Beat it
    30 Break it <----- Sometimes this is the end of the routine
    40 Fix it
    50 Sell it
    60 Goto 10

    Current
    1985 @TC 350x, 1986 @TC 600x <---need to make a 250r into a 500r next.

    Past
    81 KLT 200 ,82 ATC 185S Restored, 84 Tri Moto 125,
    84 200es Big Red, 85 250es Big Red
    85 1/2 TRI-Z 250 Fully Restored 2nd place in competition @ Metrolina bike show March 2011
    85 350x, 86 350x
    86 250r Restored ,87 250es Big Red, 87 200x Restored

  2. #2
    Join Date
    Jun 2004
    Location
    potsdam ny
    --
    1,227
    all of the trannies are the same, everything is interchangable. the wide shift drum could be from a banshee, ut the trx drum is about half the width of a banshee.
    1985 Honda ATC250R drag trike with s/t kit and full drag CR hybrid motor and drag chassis...
    1986 Honda ATC250R daily rider fully modded engine, +4 swinger,etc...
    1997 Polaris Storm 800 triple, boyesen reeds, dg individual silencers, 240 studs, 123mph on radar...

  3. #3
    Join Date
    Jan 2006
    Location
    Huntersville, NC
    --
    106

    transmission woes

    Hey thanx for the reply, I have catalogged all the parts needed for the buildup of the 250r motor, If the bearings are all good not too loose and none grinding I should only need oil seals and gaskets?
    10 Buy it
    20 Beat it
    30 Break it <----- Sometimes this is the end of the routine
    40 Fix it
    50 Sell it
    60 Goto 10

    Current
    1985 @TC 350x, 1986 @TC 600x <---need to make a 250r into a 500r next.

    Past
    81 KLT 200 ,82 ATC 185S Restored, 84 Tri Moto 125,
    84 200es Big Red, 85 250es Big Red
    85 1/2 TRI-Z 250 Fully Restored 2nd place in competition @ Metrolina bike show March 2011
    85 350x, 86 350x
    86 250r Restored ,87 250es Big Red, 87 200x Restored

  4. #4
    Join Date
    Jul 2005
    Location
    Richland WA
    --
    808
    Replace at least the crank and counterbalancer bearings. WAY too much work to go that far adn not change them. Side play should only be about 15 thousandths of an inch on any of those bearings.

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