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TOPIC: Fly-Wheel threads destroyed

Fly-Wheel threads destroyed 11 Jan 2019 11:12 #1

  • monel12
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Anyone have advice as to how to get a flywheel off of a 1969 CT 1, where the threads are all buggered up?
When I tried to screw on the puller, it just pulled itself out.

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1971 RT 1B
1971 RT 1B
1970 RT 1
1970 RT 1
1969 CT 1
1971 DT 1
1974 100MX
2016 BMW F700 GS
1982 Yamaha Towny
1971 CT 1
1975 DT400

Fly-Wheel threads destroyed 11 Jan 2019 11:30 #2

  • asco
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Left hand threaded puller must go on several turns until it stops.

The thread title should say “internal threads”
The puller needs to go back on — much deeper.

a

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YAMA-LAND
818-521-2109
MINIBIKESERVICE@AOL.COM 1971 125cc AT1-C (DOROTHEA) 1971 175cc CT1-C (BRANDY) 1970 250cc DT1-C (MONICA) 1973 100cc Hodaka Combat Rat (ABBY NORMAL) 1975 DT400 (BONNIE BELL)

Fly-Wheel threads destroyed 11 Jan 2019 12:08 #3

  • DEET
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Usually the first couple of threads are the problem.
Grind them off and go on to the deeper ones which should be good.

And, just to be sure, you know they are left hand threads.....

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Yamaha@nc.rr.com

Where the Yamaha Enduro is still a current model...

Fly-Wheel threads destroyed 11 Jan 2019 12:28 #4

  • monel12
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Yes, I did thread on left handed, but I will try going even deeper. Thanks.

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1971 RT 1B
1971 RT 1B
1970 RT 1
1970 RT 1
1969 CT 1
1971 DT 1
1974 100MX
2016 BMW F700 GS
1982 Yamaha Towny
1971 CT 1
1975 DT400

Fly-Wheel threads destroyed 11 Jan 2019 14:39 #5

  • Capt.Dave
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I ground off the first couple of threads of my puller so it bottoms out.
Dave

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Fly-Wheel threads destroyed 11 Jan 2019 15:21 #6

  • monel12
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I did that with my old one, but could not get it turned down deep enough. Bought a new one, and still having problems turning it down. Just ordered a wrench to hold the flywheel in place while turning it down. Will see if that helps. Thanks for your input.

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1971 RT 1B
1971 RT 1B
1970 RT 1
1970 RT 1
1969 CT 1
1971 DT 1
1974 100MX
2016 BMW F700 GS
1982 Yamaha Towny
1971 CT 1
1975 DT400

Fly-Wheel threads destroyed 11 Jan 2019 15:29 #7

  • Schu
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You do have the center extractor bolt backed out all the way or better yet, removed so that it doesn't contact the end of the crank? Because that will prevent you from fully engaging the left hand threaded portion of the device.
Don't ask me how I know this........

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Schu

"If it's possible to do it two ways, do it the other way first to save time"

Fly-Wheel threads destroyed 11 Jan 2019 16:34 #8

  • RT325
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Make sure both washers are out--spring & thick flat washer to get the deepest engagement possible. & as said already back the bolt right back or can hit the crank before fully home in the reverse thread. Had to shorten my favorite puller as threads had just been used to much. Is a very deep puller so had plenty to play with. Actualy i think 'that one' i put 3 grind marks at the start of the puller to use as a "poor man" Tap to clean up the damaged flywheel threads where the puller fits. Been lucky so far but suppose when the time comes i'd try a two legged strong puller in the slots & hope for the best.

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Fly-Wheel threads destroyed 11 Jan 2019 16:54 #9

  • monel12
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I was thinking about a 2 legged puller also. If I can find one to fit....

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1971 RT 1B
1971 RT 1B
1970 RT 1
1970 RT 1
1969 CT 1
1971 DT 1
1974 100MX
2016 BMW F700 GS
1982 Yamaha Towny
1971 CT 1
1975 DT400

Fly-Wheel threads destroyed 11 Jan 2019 18:04 #10

  • MarkT
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Be very careful with the two legged puller in through the slots. It's very easy to damage/destroy the stator coils under the flywheel... especially if the flywheel turns as you're tightening the puller.

:Buds

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1963 YG1-T, 1965 MG1-T, Allstate 250, 1970 CT1b, 1971 R5, 1973 AT3MX, 1974 TS400L, 1975 RD350, 1976 DT175C, 1976 Husqvarna 250CR, 1981 DT175G, 1988 DT50, 1990 "Super" DT50, 1991 RT180, 2017 XT250
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