BMW R100RS

King29 · World Chat Champion Joined: 18 Oct 2017 Karma :

I've a problem, can anyone suggest an easy fix. I've stripped the engine, done valve clearance and stripped a bolt putting the head back on. The thread is stripped in the engine. What is the easiest way to fix this? the bolt just spins. I've been a little too keen with the torque wrench.

Help.

MarJay · But it's British! Joined: 15 Sep 2003 Karma :

Yikes. How can you be 'too keen' with a torque wrench? The torque wrench is supposed to limit the torque you use, not incite you to monster it?

What bolt have you stripped? Is it one that goes through to the block or is it just a cover bolt? This is important information that will help us to tell you if you can helicoil it in situ or if you'll need to strip the motor.

You are lucky in the sense that it's a boxer so you have better access to the barrels and head than on many four strokes.
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British beauty: Triumph Street Triple R; Loony stroker: KR1S; Track fun: GSXR750 L1; Commuter Missile: GSX-S1000F; Cheap project: CBR900RR FireBlade
Remember kids, bikes aren't like lego. You can't easily take a part from one bike and then fit it to another.

Pete. · Super Spammer Joined: 22 Aug 2006 Karma :

R100Rs or R1100RS?

EDIT: 'Ang on - do you mean cylinder head or valve cover? You wouldn't take the cylinder head off to do valve clearances.
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a.k.a 'Geri'

132.9mph off and walked away. Gear is good, gear is good, gear is very very good Very Happy

BTTD · World Chat Champion Joined: 22 Nov 2012 Karma :

Seriously, pictures.

King29 · World Chat Champion Joined: 18 Oct 2017 Karma :

Yes on the case. I've about 400 pictures of the rebuild. I'll upload some.

BTTD · World Chat Champion Joined: 22 Nov 2012 Karma :

xX-Alex-Xx · World Chat Champion Joined: 12 Sep 2019 Karma :

Helicoils.

https://www.helicoil.in/helicoil.htm
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DILLIGAF

Robby · Dirty Old Man Joined: 16 May 2002 Karma :

Drill out the snapped bolt, helicoil if you need to.

Get decent drill bits, make sure you're really well centred on the bolt, take your time. Its one of those jobs where a small mistake at the beginning means it takes ages to get the job done right.

kramdra · World Chat Champion Joined: 28 Oct 2010 Karma :

You say the bolt spins, meaning only the thread into cylinder head is stripped, no bolt to remove. A helicoil or insert kit is the best option.

If the bolt is snapled, this video is relevant. Center on the chamfer, not the bolt. Dont try to do it cordless.
https://youtu.be/1sSqs5r9yXg