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Author Topic: Remove rotor using armature puller bolt  (Read 2687 times)

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Offline wrightm

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Remove rotor using armature puller bolt
« on: February 27, 2011, 02:50:27 PM »
Looking for help and advise (i.e. just tell me what to do ) I am on page 28 of the manual - step 4 - remove rotor using armature puller.  I have searched the topic. Thanks to retaRD, Bluesix, rgrant stroke2 and others for the posts  but the rotor is still on the engine ( 77 rd400 ) I thread in the armature puller into the threads the rotor bolt and cam came out of until it bottoms out.    I am holding the rotor and turning the bolt clockwise with what seems to be considerable force and nothing is happening. obviously I am doing something wrong. Doesn't bode well Thanks
1977 Yamaha RD400
2003 Suzuki DRZ400S
(more pending)

Offline wrightm

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Re: Remove rotor using armature puller bolt
« Reply #1 on: February 27, 2011, 02:58:18 PM »
Cancel that request.  I re-read other posts on the topic and they did say " considerable force.  I was putting things away and calling it a day and I decided in my frustration to use " considerable force" and it poped off as predicted.  Thanks :woop:
1977 Yamaha RD400
2003 Suzuki DRZ400S
(more pending)

Offline m in sc

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Re: Remove rotor using armature puller bolt
« Reply #2 on: February 27, 2011, 03:53:07 PM »
love it when a plan comes together...    :clint:
get off my lawn.

Rock Hill, SC

Offline sesshomaru

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Re: Remove rotor using armature puller bolt
« Reply #3 on: February 28, 2011, 07:38:54 AM »
Another tip:

I snug it up to about 25 ft.lbs. and then tap on the bolt with a hammer; it usually pops right off with minimal bullshit and swearing. :laugh: Less chance breaking a bolt off into the rotor too, which I've seen happen.
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Offline yam3narthur

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Re: Remove rotor using armature puller bolt
« Reply #4 on: February 28, 2011, 11:40:21 AM »
i use one of the exhaust rear mounting bolts.
same technique. find the point where it bottoms out then give it a quick whack.
Narrow city streets, winding country roads and the open highway belong to you astride the rugged and powerful YAMAHA RD350

------------------------------------------------------------
Yamaha RD350A 1974 uk. 
Puch M50 sports  1973
Kawazaki ZX6R 2000
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Offline Daveo

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Re: Remove rotor using armature puller bolt
« Reply #5 on: February 28, 2011, 12:11:38 PM »
Tight + hammer worked for me too!
'75 RD350

Offline Makin Treehugrs Mad

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Re: Remove rotor using armature puller bolt
« Reply #6 on: February 28, 2011, 05:39:39 PM »
Good tip about the hammer. I have a little story about that ....

A buddy of mine brought me a V-star 1100 to fix a bent valve. This all started as a simple starter sprag replacement ... :lol:

Before he screwed up the valve timing, he was trying to remove the rotor with a puller. He puts it on tight by hand, then HAMMERS the piss out of it full bore with a 700 ft.lb. impact gun! :aaa: The crank end opened up like a flower. 3 "petals" peeled back that I had to pound back into shape & weld. After that, he hogged on an American SAE thread die! So now it has this huge nut that requires a 1-1/4" socket ... I feel for the next tech that gets this bike. :laugh:

I still had to pull the engine to remove the head. That was one hell of a job myself. Another reason to love 2-strokes! :thumbsup:
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Offline danfr

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Re: Remove rotor using armature puller bolt
« Reply #7 on: May 27, 2011, 09:29:21 PM »
I'm really struggling trying  to remove the armature from my 73 RD350. Just to clarify, I am tightening down in the larger, shallower threading, verses the deeper skinnier thread that i believe threads into the cam. And i am striking the hammer on the head of the bolt i thread in, towards the engine?

can't figure out what i'm doing wrong here....
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1973 RD350
1973 CB350K
1974 CB350F
1974 CB750K

Offline whodat

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Re: Remove rotor using armature puller bolt
« Reply #8 on: May 27, 2011, 09:52:11 PM »
Towards the engine? That doesn't make any sense. All you have to do is insert a bolt into the threaded portion of the rotor and tighten it down. If the rotor doesn't come of easily, then you should give the wrench a wack with a hammer in a clockwise direction.

Offline RLB454

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Re: Remove rotor using armature puller bolt
« Reply #9 on: May 27, 2011, 10:10:49 PM »
Yup, a small whack with a hammer to the end of the bolt. You dont want to whail on it, but that little jar with most often be just the ticket to get it to pop off. Think of an impact driver, same principle.
« Last Edit: May 27, 2011, 10:11:30 PM by RLB454 »
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Offline whodat

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Re: Remove rotor using armature puller bolt
« Reply #10 on: May 27, 2011, 10:26:51 PM »
Whacking the bolt itself is not the same principle as an impact driver. Whacking the wrench is. Smacking the bolt head with a hammer could damage the threads of the rotor. Hitting the wrench handle will not, as you are not directly impacting the threads.

Offline CR750

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Re: Remove rotor using armature puller bolt
« Reply #11 on: May 28, 2011, 12:20:18 AM »
This method is not about using the bolt to "jack" the rotor off with a rattle gun or by wacking the spanner!

It's about using the bolt to introduce tension between the rotor and the crank taper, then using the "shock" of smacking the bolt firmly but gently TOWARD the primary drive gear on the other end of the crank!
Pinching up the bolt, and just one wack is usually enough to complete the job. You don't need to be Sampson. This is quite a gently thing to do. Gentle both on the crank and on the tools.

This is a correct and tried and true method for dislodging taper locks.
« Last Edit: May 28, 2011, 12:23:14 AM by CR750 »
'73 RD 350 - Yamaha
If it's stuck, force it.
If it breaks, it needed replacing anyway.

Offline danfr

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Re: Remove rotor using armature puller bolt
« Reply #12 on: May 28, 2011, 01:56:42 AM »
K, well tomorrow I'll wack away and see if it'll pop off. Thanks..

Daniel
----------
1973 RD350
1973 CB350K
1974 CB350F
1974 CB750K

Offline danfr

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Re: Remove rotor using armature puller bolt
« Reply #13 on: May 28, 2011, 11:53:56 AM »
No luck. Would it be too much to lock the rotor in with a boa and use an impact wrench?
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1973 RD350
1973 CB350K
1974 CB350F
1974 CB750K

Offline whodat

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Re: Remove rotor using armature puller bolt
« Reply #14 on: May 28, 2011, 12:31:38 PM »
You could run the risk of mushrooming the end of the bolt with an impact wrench. You might be able to get away with it, but I would be super careful. Set it to it's lowest torque setting and just use short bursts of the trigger if you are intent on using it at all. I wouldn't recommend it though.
If you do decide to try it, and the rotor doesn't pop off after the first few pulls of the trigger, stop and find another way to get it off.
« Last Edit: May 28, 2011, 12:45:05 PM by whodat »