Author Topic: Yamaha DT2MX clutch actuator rod length and bearing size.  (Read 2486 times)

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Offline firko

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Yamaha DT2MX clutch actuator rod length and bearing size.
« on: August 13, 2013, 10:00:13 pm »
I've got three different length clutch actuator rods and two different sized ball bearings. What's the correct length for the rod and OD of the ball bearing please?
'68 Yamaha DT1 enduro, '69 Yamaha 'DT1 from Hell' '69 DT1'Dunger from Hell, '69 Cheney Yamaha 360, 70 Maico 350 (2 off), '68 Hindall Ducati 250, Hindall RT2MX, Hindall YZ250a , Cycle Factory RT2MX flat tracker, Yamaha 1T250J, Maico 250 trials, '71, Boyd and Stellings TM400, Shell OW72,750 Yamaha

Offline OverTheHill

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Re: Yamaha DT2MX clutch actuator rod length and bearing size.
« Reply #1 on: August 14, 2013, 09:04:26 am »
tryin t think, long ago--mushroom clutch end is bigger than pushrod Firko & has a 5/16 ball between it & pushrod. Not sure of pushrod length but diameter is 1/4 by memory [6.5mm] & is a reasonable fit through the shaft so it sits pretty good against the 5/16 ball as it operates the clutch. In saying that--there's a 1/4 ball recessed into the lifter arm which sometimes gets out [on the bench] if the little punch marks wear off. for length i [if stuck for genuine bits like me] just fit it all up with a longer rod than necessary, sit lifter cover against it & measure the hap to shorten up & re-harden the end. I do a similar measuring trick when making throttle cables--solder end on lightly, fit it up, pull outer cable to seat everything, then measure the gap to the adjuster or carb top bit.
That should start the ball rolling & if my memory's up the creek hope someone puts me right. Cheers.

Offline firko

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Re: Yamaha DT2MX clutch actuator rod length and bearing size.
« Reply #2 on: August 14, 2013, 10:32:04 am »
Thanks Morley, the ball diameter was the main thing I needed. Because I'm using a Crockett and Son Racing Specialties YZ-A replica clutch actuator, the longest of the rids I've got seems to be one that'll make the final cut. I'll run down to the bearing place this afternoon and buy a handful of 5/16 or 8mm ball bearings.
'68 Yamaha DT1 enduro, '69 Yamaha 'DT1 from Hell' '69 DT1'Dunger from Hell, '69 Cheney Yamaha 360, 70 Maico 350 (2 off), '68 Hindall Ducati 250, Hindall RT2MX, Hindall YZ250a , Cycle Factory RT2MX flat tracker, Yamaha 1T250J, Maico 250 trials, '71, Boyd and Stellings TM400, Shell OW72,750 Yamaha

Offline yamaico

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Re: Yamaha DT2MX clutch actuator rod length and bearing size.
« Reply #3 on: August 14, 2013, 11:49:58 pm »
Thanks Morley, the ball diameter was the main thing I needed. Because I'm using a Crockett and Son Racing Specialties YZ-A replica clutch actuator, the longest of the rids I've got seems to be one that'll make the final cut. I'll run down to the bearing place this afternoon and buy a handful of 5/16 or 8mm ball bearings.
Probably best you drive down Mark, what with those dicky knees and all...

Offline OverTheHill

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Re: Yamaha DT2MX clutch actuator rod length and bearing size.
« Reply #4 on: August 15, 2013, 09:14:53 am »
yamaha have a way of, listing things that help id sizes sometimes. have a look at yam parts through the link on our 'livewire vmx' site, go to links then down to yam parts & find your way to dt2mx. clutch mushroom ball shows a 5 at end of first numbers then a 16 as first two of second row which means 5/16 or [8mm], yam numbers can be quite helpful sometimes. Cheers. ps, i'm sure you knew all that Firko, so i won't pull the 'Mr Know It All' line haha.

Offline firko

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Re: Yamaha DT2MX clutch actuator rod length and bearing size.
« Reply #5 on: August 15, 2013, 09:26:33 am »
I didn't know that Morley and feel free to remain Mr Know-it-all mate, it's always good to learn new stuff.
'68 Yamaha DT1 enduro, '69 Yamaha 'DT1 from Hell' '69 DT1'Dunger from Hell, '69 Cheney Yamaha 360, 70 Maico 350 (2 off), '68 Hindall Ducati 250, Hindall RT2MX, Hindall YZ250a , Cycle Factory RT2MX flat tracker, Yamaha 1T250J, Maico 250 trials, '71, Boyd and Stellings TM400, Shell OW72,750 Yamaha

Offline Davey Crocket

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Re: Yamaha DT2MX clutch actuator rod length and bearing size.
« Reply #6 on: August 15, 2013, 09:41:53 am »
KTM are the same with p/n, if you know how to read them you can work out all sorts of things.
QVMX.....Australia's #1 VMX club......leading the way.

Offline GD66

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Re: Yamaha DT2MX clutch actuator rod length and bearing size.
« Reply #7 on: August 15, 2013, 09:59:32 am »
tryin t think, long ago--




Morley spotted at a Gisborne beach race on his 250 Yamaha in 1973.

Looking good, son !  ;)
Nostalgia's not what it used to be....

Offline firko

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Re: Yamaha DT2MX clutch actuator rod length and bearing size.
« Reply #8 on: August 15, 2013, 10:03:23 am »
Groovy sideburns Morley. 8)
'68 Yamaha DT1 enduro, '69 Yamaha 'DT1 from Hell' '69 DT1'Dunger from Hell, '69 Cheney Yamaha 360, 70 Maico 350 (2 off), '68 Hindall Ducati 250, Hindall RT2MX, Hindall YZ250a , Cycle Factory RT2MX flat tracker, Yamaha 1T250J, Maico 250 trials, '71, Boyd and Stellings TM400, Shell OW72,750 Yamaha

Offline OverTheHill

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Re: Yamaha DT2MX clutch actuator rod length and bearing size.
« Reply #9 on: August 15, 2013, 08:47:43 pm »
god damn it, where do ya find these things. There's more hair on those sideburns than on my head now--thank for reminding me!!