Need some help 1988 FXSTC

Discussion in 'Transmission' started by lowered907, Jun 5, 2014.

  1. lowered907

    lowered907 New Member

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    Does anyone know how to troubleshoot and repair a 1988 FXSTC trans that wont move in gears 1-4 but works in 5th?
     
  2. Jack Klarich

    Jack Klarich Expert Member

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    Re: Diagnosing Transmission Problems

    I would take the top cover off and have a look at the shifter forks for starters
     
  3. lowered907

    lowered907 New Member

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    OK so im new at this. I pulled the compensator and primary to change the starter pinion gear. had some trouble getting the clutch adjusted using the manual. the problem seemed to be the ramp on the opposite side of the trans was stuck. I took it out for a shakedown run (about 20 minutes) and it ran great until a 1-2 shift. clutch seems to slip. the engine revs but the bike does not move forward in any gear 1-4. there was no abnormal noise of any kind, motor running or not. I pulled the primary cover and verified the clutch rotates when the engine is running. When I squeeze the handle the clutch hub moves. I pulled the primary all apart again, and noticed the input shaft does not spin in gears 1-4 with any load on the input shaft. however in fifth gear while spinning the tire by hand the input shaft turns as designed.
     
  4. Bodeen

    Bodeen Well-Known Member Staff Member Moderator Contributor

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    I merged these posts together in one place and deleted the cross post.
     
  5. lowered907

    lowered907 New Member

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    Thank you.
     
  6. fin_676

    fin_676 Experienced Member Staff Member Moderator Contributor

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    I am not a gearbox expert but I think that 5th gear is on the main shaft and connects directly to the main drive giving a straight through drive
    All other gears have gears on the main shaft and on the counter shaft that get locked together when selected
    So I think you may have a issue inside the gearbox which will need a wee bit more knowledge of the area than I have

    Brian
     
  7. Bodeen

    Bodeen Well-Known Member Staff Member Moderator Contributor

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    See Jacks suggestion at entry #2.