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Makotosun

Stripped screw head on oil pump cover-

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Replied by msavitt on topic Stripped screw head on oil pump cover-

i would try to grab it with a small, pointy vice grips laid flat against pump before drilling, banging or chiseling.
this is how I recently losened same screws when it felt too tight for screwdriver

IGNORE ME - I SEE NOW ITS THE CASE AND NOT THE ACTUAL PUMP, DRILL AWAY I SAY!
Last edit: 08 Mar 2021 08:54 by msavitt.
08 Mar 2021 08:49 #11

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Replied by run103 on topic Stripped screw head on oil pump cover-

Get An impact driver and use it enen manually to get case screws out.  If they dont come out then take the right tight fitting bit and yap it with a hammer so it seats in the screw and then connect the impact handle and give it a firm hit.  This is the best tool ever for frozen screws and bolts
Doug
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08 Mar 2021 12:32 #12

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Replied by Grussell on topic Stripped screw head on oil pump cover-

This works good too. A necessity if your going to split the cases and do a rebuild. 
1978 DT400
1975 DT250
1976 YZ125X - my post vintage race bike
2022 KTM 300XCW - my race bike
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Last edit: 08 Mar 2021 14:17 by Grussell.
08 Mar 2021 14:16 #13

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Replied by RT325 on topic Stripped screw head on oil pump cover-

wonder if these are any good.
www.aliexpress.com/item/1005001707877026...02_,searchweb201603_
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08 Mar 2021 20:22 #14

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Replied by mdscott on topic Stripped screw head on oil pump cover-

those look interesting 
Thanks Mark
Roseville, Ca.

'03 ST1300
'75 Norton
'73 CB500K
'81 Honda CT110
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'64 McClane Edger
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09 Mar 2021 08:57 #15

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Replied by rodent on topic Stripped screw head on oil pump cover-

Sit a 6mm(ID) nut over it and mig weld in the middle and undo with a spanner :)
09 Mar 2021 10:35 #16

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Replied by RT325 on topic Stripped screw head on oil pump cover-

tapping the head of it back into shape with a flat punch works, then get a 'new' Number3 impact tip & tap it into the screw head the with a T bar handle & it'll come out easy. Danger in chizeling around is with long screws you could break out the cover as is a long hole it goes through.
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09 Mar 2021 13:54 #17

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Replied by Schu on topic Stripped screw head on oil pump cover-

Mark Ts post #9
I've done it successfully many times.
I can't image garage life without the hammer type impact driver.
Schu

CT1B, CT1C, JT1, JT2, DT360A, GT80B, DT100B, DT125B,
DT175B, DT175C, DT250B, DT400B, Z50, SCR950

Someday, you'll own some Yamahas
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09 Mar 2021 16:03 #18

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Replied by TheRiggs on topic Stripped screw head on oil pump cover-

I've had the same problem. I picked up this from the local big box store.
10 Mar 2021 18:01 #19

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Replied by principal282 on topic Stripped screw head on oil pump cover-

I had luck with both a hammer drill and using a small voice grip and one good whack. I replaced with genuine yamaha screws. Get a jis screwdriver too they make a difference.
 
10 Mar 2021 18:46 #20

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