Reamer sizes for Commandos

APRRSV · Apr 18, 2020

Hi all,
I recently purchased a 7/8" reamer for the cam bushes for my Commandos. My question is what other reamer sizes are necessary for routine maintenance/rebuilding of Commandos? Thinking about swingarm, gearbox etc.
Thanks,
Ed

jimbo · Apr 18, 2020

to have a setup and reamer that would correctly ream both cam bushings would be very time consuming and expensive . Other ones are not needed IMHO

APRRSV · Apr 21, 2020

jimbo said:
to have a setup and reamer that would correctly ream both cam bushings would be very time consuming and expensive . Other ones are not needed IMHO

Thanks Jimbo. Knowing that other bushings don't need to be reamed is comforting.

Ed

htown16 · Apr 21, 2020

Valve guides. New guides tend to slightly collapse so ream to proper clearance.

baz · Apr 22, 2020

1st gear pinion in the gearbox usually needs to be reamed in my experience

dynodave · Apr 22, 2020

I feel neglected....I have been deprived of playing machinist.
Other than valve guides and swing arm once... in over 30 years I have never reamed a norton bushing.
Prep by cleaning, deburr, and press not bash to install.

maylar · Apr 22, 2020

baz said:
1st gear pinion in the gearbox usually needs to be reamed in my experience

Yup, 0.685. And if you buy a high output Sparx alternator the rotor needs to be reamed to .750"

acadian · Apr 22, 2020

jimbo said:
to have a setup and reamer that would correctly ream both cam bushings would be very time consuming and expensive . Other ones are not needed IMHO

Not necessarily, there are a few on this board who have fabricated alignment jigs. Timewarp and Jim S come to mind, I have my own but no pics at the moment

jimbo · Apr 22, 2020

maylar said:
Yup, 0.685. And if you buy a high output Sparx alternator the rotor needs to be reamed to .750"

you guys are better than me ,I bought a fine grit ball hone, made a half key and fitted the alternator rotor to a light tap on fit. Valve guides are a specialist's job , I farm those out. Cam bushings get the slit ended wooden dowel in a drill fine wet/dry sandpaper treatment.

Reamer sizes for Commandos

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