Snapped cylinder stud

[Medicinal_Motocross]

Along with the other problems i have with my bike today whilst tightening the stud nuts (cylinder onto crankcases) one gave way and snapped the stud half way up I wasnt overly tightening so i put it down to being a weak one the rest had the same amount of pressure with no problems...

In a nutshell what options do i have to repair this without removing the whole cylinder ? Im pretty sure a weld would do it but im clueless. The cylinder is still sitting as it was guessing the other 3 nuts being tight will hold it securely but my question is without the one nut is it going to cause me any issues if i left it as it was? I ran it briefly sounded exactly the same but im hoping a 2stroke fanatic can shed some light on this before the bike ends up in the nearest canal ?

[Medicinal_Motocross]

I do have another stud on my spare engine but im just trying to improvise without removing all the top end, draining coolant, 2stroke etc etc

[Nobby the Bastard]

I'll avoid pointing out that you overtightened it (you did, that's why it snapped) and ask if enough of the stud is left for you to balance a nut on it with the cylinder in place.

If yes, you can weld a nut to it to aid removal.

From your description, you won't be able to, though. There is no alternative apart from stripping the top end.

The only issue is, why were you fucking with the head studs? You state that you'll have to drain coolent so this wasn't part of a top end rebuild.
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[kramdra]

Why were you tightening the cyl head nuts

If you run it, the head will warp and be fucked. Head comes off, stud might be easily removed if protruding, everything back together in an hour or two.

Studs not expensive, why ruin another engine?

Stay away from bikes

[-]

You will not repair that without removing the cylinder. It needs removing with a stud extractor and replacing. With only 3 it will leak coolant.

No amount of gaffer tape or blue-tac will work.
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[Pete.]

Buy four new studs and strip the top end. Really, you can dismantle that in 15 minutes how can that be too much trouble?
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[kramdra]

Studs should not be reused. Did you even use a torque wrench?

https://www.bikechatforums.com/viewtopic.php?p=4124980#4124980

[Medicinal_Motocross]

The nuts are in such a position a torque wrench cannot be used (so i believe) but yes im aware i overtightened. Il put it down to experience.

Would it really warp the head in such a short running time?

Theres no stud sticking out from the cylinders hole just my luck it was the shorter front stud of them

It should be possible to remove the top end with engine in frame only thing i might struggle with the engine being in frame is to line up the piston ring grooves, i dont have a stud extractor can the use two nuts on it to lock them together work does anyone know?

It worked on my exhaust studs

[Medicinal_Motocross]

Yes i will order 4 new studs, are they easy to remove/fit ?
Can anyone show me a link of the exact stud tool i need, does the stud extractor extract aswell as fit the stud?

[sickpup]

[Medicinal_Motocross]

Will i get away with just replacing the one stud sickpup?

Havent heard of everyone replacing studs every time theyve done a top end rebuild, it will save me money from buying the studs & extractor tool if i can get away with not using it?

[chris-red]

You might be able to tap it round with a small drift, I did something similar with a clutch spring bolt I managed to snap when my Torque wrench broke (it stopped clicking). I should have listened to my gut rather than the torque wrench. Now every time I use my new one I put a bolt in a vice and test it first.

Try to find a raised part of the snapped face of the stud put a drift or small screw driver up against it then GENTLY tap it anti clockwise. Be careful not to damage the thread.
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[Medicinal_Motocross]

That sounds logical but my question is will it catch onto the stud?

Also if i use the extractor tool/set with my stud snapping around half way down will the tool grip on to it?

Is this what i need ?

https://www.ebay.co.uk/itm/Stud-Extractor-Remover-Set-6-8-10-12mm-manifold-exhaust-Stud-Extracting-Removal-/251232367180?pt=LH_DefaultDomain_3&hash=item3a7e9db24c

[Aff]

Have people actually been looking at the pictures he put up?

There is no way he's gonna be able to weld anything to the stud or tap it out with a punch.

However, it's a 2 stroke, it really isn't much effort to pull the head off and replace the stud.
Don't worry about a stud extractor, just put a couple of nuts on it, or attack it with a pair of vice grips. There should be plenty sticking out to play with.
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[Medicinal_Motocross]

I tried the two nuts on one of the spare studs i have now they wont come off, even wen put back in because if the nuts come off the studs in secure and wont come out

So i think a stud extractors the most theoretical option ? I take it they dont damage the stud thread in any way when extracting/putting in?

The extractors dont need a certain amount of bolt being there to fit do they?

[chris-red]

[chris-red]

[chris-red]

I'm not sure if the OP has consented to taking the head off yet so that might be a bit harsh. If you whip the head off I wouldn't be surprised if you can undo it with you bare fingers. Mole grips certainly would sort it.
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Well, you know what they say. If you want to save the world, you have to push a few old ladies down the stairs.
Skudd:- Perhaps she just thinks you are a window licker and is being nice just in case she becomes another Jill Dando.
WANTED:- Fujinon (Fuji) M42 (Screw on) lenses, let me know if you have anything.

[Vincent]

[Pete.]

[Medicinal_Motocross]

With the cylinder on i have bob hope of getting anything inside to tap it round, i could possibly drill into the snapped stud to spin it out but for the sake of taking the barrel off id rather that than loads of metal filings inside my crank area

The extractors you sent a link of on Amazon the easy outs, i have some and they are shite even for the simpliest bolts in my experience of using them

I think i am going to order : https://www.ebay.co.uk/itm/Impact-Stud-Extractor-Removal-1-2-Drive-For-6-13mm-Studs-Bolts/201190374937?_trksid=p2047675.c100005.m1851&_trkparms=aid%3D222007%26algo%3DSIC.MBE%26ao%3D1%26asc%3D31103%26meid%3D23c7bd340b494aaca31a82429d1de428%26pid%3D100005%26rk%3D1%26rkt%3D6%26mehot%3Dpp%26sd%3D360412933231&rt=nc


Having seen a video of using them on a car cylinder it gripped onto the broken stud well and turned straight out with a ratcher

Can they be used to re fit a stud without damaging the thread? Has anyone used one to put a stud in ?

Chris-red i meant as in would the half the stud (approx 1cm) be enough to grip on to it but im going to order one and hope for the best

Corby parts diagram says : STUD,8X28 but i get a reading of 44.79mm of the whole stud (including bit thats inside the case when fitted) and 22.11 approx of the bit that will stick out

[Vincent]

You'll be better off with one of these type of extractors:-

https://i77.photobucket.com/albums/j71/Drewskovitch/Jap%2070s%20bike%20toys/Bike%20toys/P6052809_zps69b66bbe.jpg

https://i77.photobucket.com/albums/j71/Drewskovitch/Jap%2070s%20bike%20toys/Bike%20toys/P6052811_zpsf8a9d013.jpg

You'll need at least 10 to 15mm of stud showing.
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[Medicinal_Motocross]

I did see them on eBay for around the same price but will i get away with using the one i purchased? Seems to tighten/loosen to fit different size studs.

Am i ok to use it to re fit the stud do you know?

[Vincent]

[Vincent]

One thing, the quicker you loosen off the other three nuts, (if you havn't already), the less chance you have of warping the head
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