250 2c gear selection improvement
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Thread: 250 2c gear selection improvement

  1. #1
    Member
    Name
    chris
    Member #
    13581
    Join Date
    May 2014
    Location
    northampton
    Posts
    83

    250 2c gear selection improvement

    Hi,

    I'm re-building my 2c bottom end & from what I remember when I used it years ago was that the gear selection was never good, graunchy with loooong lever travel to engage gears.
    Having looked at the selector drum detent plunger cone, I have decided to remove the end of & insert a 9mm ball bearing to see if this eases things, however if there is not enough detent then it may jump out of gear easier.
    I have rearsets so may be able to change lever lengths to reduce travel.
    Anyone made any gearbox improvements they recommend?

    cheers
    chris

  2. #2
    Member
    Name
    Tony
    Member #
    9962
    Join Date
    Feb 2010
    Location
    South Australia
    Posts
    96
    Hi Chris,

    I'm starting another rebuild soon so any hints on improving or smoothing gear selection would be appreciated.

    One thing I've mentioned on the forum previously is the roll pin on the selector fork shaft. The shaft which has the gearshift lever on one end and the selector fork on the other is prone to wear. This occurs in the tiny roll pin which holds the selector fork assembly to the shaft. In minor cases you can detect a little rotation movement in the selector fork assembly (in relation to the shaft) and in major cases the roll pin shears completely. My assumption is that the roll pin acts as a break point when some heavy footed person stomps on the gearchange. Better to shear a roll pin than the shaft and the whole thing is fixable without splitting the cases.

    Anyhow, if there is some wear, go up a size in the roll pin because any movement at all makes gear selection difficult.

    Cheers,

    Tony

  3. #3
    Member
    Name
    chris
    Member #
    13581
    Join Date
    May 2014
    Location
    northampton
    Posts
    83
    Tony,
    Thanks for the pointer on the pin, will deffo check this out.
    I'll post the result of the ball/detent mod, at least this can be changed/preload modified on an installed engine to get the best result.

    cheers
    chris

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