selector drum shimming question

[ray bear]

Re shimming shift drum on  my eldorado 5 speed , the consensus seems to be approximately give or take a 1.00 mm shim at the front of the selector drum (clutch end) and then adjust the rear shims to allow drum to spin with no end float and measured with no gasket insitu . and then make adjustments to shims to centralise the sliding collar  between 1st and 2nd , this I have done but to obtain that setting I have had to put 1.15 mm of shims in the front of drum which may be too much  but sliding collar is central to 1st and 2nd in neutral and I have an equal clearance between the dogs of collar and 1st and 2nd dogs when engaged in each of those gears so forks are not bound up on collar when engaged and the fork is free to move in the sliding collar , the box snicks nicely between all gears and seem great just my front shim seems to be larger than the 1mm that most people speak of . what have others ended up with on front of drum shim. results were acheived with input and out put nuts secured and gasket in place and have read peter ropers and greg bender charlie cole greg field and karl hartmeyer literature , My Question is what dimension approxamately should the front shim normally be  thanks Ray

[Wayne Orwig]

The 1mm is just a starting point. So needing to add a little more is normal, right?
And you have no binding or excess play without a gasket.
That all sounds right.

[SIR REAL ED]

Does this apply to MG bikes with quick shifters also....

Enquiring minds want to know!!

[guzzisteve]

Haven't found a q-shifter yet that can out shift me, just sayin' it's all relative. In the end you loose the race. You can remove 1/2 the shifter dogs for a quick shift but then you'll be rebuilding it every couple races.

[moto-uno]

  " Mike's Machines" on YouTube is an excellent video on it , worked well for my LeMans 2  .

[Antietam Classic Cycle]

A "quick and dirty" way of determining "ballpark" shift drum shimming on an early 5 spd is to align the detent holes in the shift drum with the hole the detent plunger slides in. This does not work on later 5 spds with the milled slots, of course.

[ray bear]

Thanks everyone I have it finished and yes Charlie I did use that trick but in the end the shift collar was true centre with 1st and 2nd dogs and dog engagement between collar and 1st and 2nd dogs was identical measurement and you can slide the blunt end of a drill bit down the indent hole and slides straight in to the drum holes so it is a bit of a cheats method , ended up 0.96 at bottom and 0.91 at rear  total of 187 ,I installed as new used forks so did not have a starting point such as fork wear to go by, lot of shim grinding and messing about looking for a greater selection of shims than what Guzzi supply  but hey it works very smooth ,  thanks again Ray