Ive seen worse welded up. its worth a shot, its a 50/50 thing, you might be lucky, you might not, i'd get a head just in case. You weld a little block on, drill it & tap it - i cant see that piece of broken rubbish being welded back on.

Morespeedvicar wrote:Hi, could you drill down a bit further and tap the hole and use a longer stud? you have to be mega carefull not to hit the water jacket/oil ways! maybe worth a try if heads nakered already.
Cheers
Ian

This may work if you use the header clamp to line the drill up? I fear access may be a problem tho...

Überbodge: Is there any way you can strap the header to the head by using a very long jubilee-clip arrangement around the exhaust & back of the barrels so the bike can still be ridden without the header blowing?

the header still has 3 nuts holding it on and i mate sure not to over tighten them so they pulled that part of the manifold away, so hopefully it will be ok for a short period of time.
The old man said there should be enough spare metal there to drill and tap it and just use longer studs.

I kinda want to avoid a new head as much as possible, as i neither have the time/skill nor the garage to drop the engine and replace the head. If i did i would have no form of transport for however long.
Im going to re-fit the rear pipes tomorrow as long as the weathers good and i'll check if/or how much its blowing.

You can swap the head with the engine in the frame...it is not as difficult as you think...

A dirty bodge for now but I'd be worried about further damage and cracks spreading with the additional vibration.

sort it in the summer..

CMSMJ1 wrote:You can swap the head with the engine in the frame...it is not as difficult as you think...

A dirty bodge for now but I'd be worried about further damage and cracks spreading with the additional vibration.

sort it in the summer..

Oh god im not leaving it until the summer, if i have to swap a head i will, it will be done by spring.
gives me a chance to do valve clearances too....first i need an abba stand though. Currently borrowing one of a friend, they are amazing!

I feel your pain I have the exact same problem on my right down pipe
I'm runnng a full tyga system so its blowing a lot

I did a rough repair job in august mines not as bad as yours I only lost half the thread
Did a weld job to fix this has now failed so I'm looking at a new head

And I just did my valve clearences so not happy
just wondering if you guys know wether all rear nc 30 heads are interchangeable i.e. a later head
on an 89 engine

Cheers alex

All heads the same.

If you want to ride down you can come and have a spare one of mine...todmorden in't that far away..

I'd repair it with some lumiweld etc rather than replace the cylinder head if you can't afford the time / expense of a stripdown.

http://www.frost.co.uk/item_Detail.asp?productID=8823

It will be more than good enough to hold the exhaust stud providing you dont' torque it up to the extreme.



Very similar to this kind of thing.

CMSMJ1 wrote:All heads the same.
</BR>
</BR>If you want to ride down you can come and have a spare one of mine...todmorden in't that far away..

That would be great I should be free this weekend if that's ok with you

Neosophist wrote:I'd repair it with some lumiweld etc rather than replace the cylinder head if you can't afford the time / expense of a stripdown.
</BR>
</BR>http://www.frost.co.uk/item_Detail.asp?productID=8823
</BR>
</BR>It will be more than good enough to hold the exhaust stud providing you dont' torque it up to the extreme.
</BR>
</BR>
</BR>
</BR>Very similar to this kind of thing.

I used lumi weld the to repair it first worked fine but its now failed I could do it again
but it will probably fail again

Cheers alex