Bizarre Exhaust installation Issue LM1 |
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simonnorthroad
Senior Member Joined: 16 May 2017 Location: Bath, UK Status: Offline Points: 156 |
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Posted: 15 Jul 2019 at 15:00 |
Then latest exciting instalment of my round-barrel LM basketcase buildup.
When I install my Keihan downpipes,there is not nearly enough stud protruding to even get the exhaust nuts started. Ive got tthe proper LM flared split-colletts with the flares seated in the grooves of the finned clamp and the other end of the collets butting up against the header flange but when I offer it up, Ive go no stud thread proud enough to put the nuts on Ive had to unwind the studs out till they are only, perilously, held into the heads by a few threads to be able to put the exhaust nuts on. The Keihan headers seem as well made as ever and the collets are correct and installed correctly, is this a common issue?
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GuzziPaul
Senior Member Joined: 10 Oct 2015 Location: Essex Status: Offline Points: 219 |
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Have you checked the header is seating all the way down without the collets in. I only have standard headers, but sometimes when refitting them they do seem to stick out ab bit more than normal making the nuts hard to get started.
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Brian UK
Moderator Group Joined: 13 May 2014 Location: Surrey Status: Offline Points: 17641 |
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I would agree. Make sure the header is fully seated. Under no circumstance should you try to pull it in with the nuts, you risk pulling the studs out of the head.
I assume you don't have the silencers fitted. |
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Brian.
Better 5 minutes late in this world than years early in the next. |
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Barry
Senior Member Joined: 02 Mar 2015 Location: Oxford Status: Offline Points: 2811 |
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I had that issue when I fitted Keihan downpipes to a 1000SP - and ended up getting longer studs. It was, and remains, a mystery.
Something suggested to me then (which wasn't applicable, in my case) has a PO used 'crushable' washers with their old downpipes, leaving the crushed part still in the head? Likely not, but worth a look! Others have reported oiking more than one old crushed washers out of their heads. |
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Dave P.
Senior Member Joined: 12 Jan 2015 Location: Northants Status: Offline Points: 5573 |
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Yep,seen that one on Laverda twins.
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TO LIVE OUTSIDE THE LAW YOU MUST BE HONEST.
1971 V7 Special. 1972 850GT. 1970 T120 Bonnie. 2009 500 Bullet. |
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Jerry atric
Senior Member Joined: 24 Nov 2014 Location: Wiltshire Status: Offline Points: 3367 |
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And on my Cali
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Oldrat
Senior Member Joined: 31 May 2014 Location: Harrow Status: Offline Points: 1659 |
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I’ve seen two sets of gasket rings fitted. Good luck
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iansoady
Senior Member Joined: 23 Jul 2017 Location: Redditch Status: Offline Points: 2402 |
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The studs on my V50 are on the short side as well. If I was in your position, I'd just get some longer ones. I'm not normally a fan of all-thread but that (in stainless) might be a solution.
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Ian
1952 Norton ES2 1986 Honda XBR500 1958-ish Greeves/Triumph in progress |
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BondEquipe
Senior Member Joined: 10 Dec 2014 Location: Summerzet Status: Offline Points: 1898 |
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Old exhaust gaskets can look like they're part of the head until you really dig them out. Been there . . .
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Stephen
Black & Gold LM2 + Other Bikes & Projects! |
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Mike H
Senior Member Joined: 21 May 2014 Location: East Anglia Status: Offline Points: 8733 |
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What he said. Or, the keihan flanges are too thick? Do you have stock MG ones to compare to?
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"Chicken nuggets don't dance on a Tuesday."
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jpc
Senior Member Joined: 06 Oct 2016 Location: Belgium Status: Offline Points: 651 |
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I have a few roundfin heads lying around, all have 26 mm studs, quite long enough even with 2 crush rings.
Don't know about Keihans though, and my finned clamps are flat-faced, no collet groove. Original flange 2.5 mm thick, collets 18 mm long.
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simonnorthroad
Senior Member Joined: 16 May 2017 Location: Bath, UK Status: Offline Points: 156 |
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Thank you all for your advice. Yes the header-pipe is fully home inn the port. There is no old gasket in the port and Im using a new gasket in each side. I dont have a std header to compare the Keihan one too to, but it doesnt look excessively 'deep' .
Good advice on not 'mullering' the nuts up too tight. I was tempted...
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Dave P.
Senior Member Joined: 12 Jan 2015 Location: Northants Status: Offline Points: 5573 |
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Are the studs original or have they been replaced with shorter ones?
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TO LIVE OUTSIDE THE LAW YOU MUST BE HONEST.
1971 V7 Special. 1972 850GT. 1970 T120 Bonnie. 2009 500 Bullet. |
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simonnorthroad
Senior Member Joined: 16 May 2017 Location: Bath, UK Status: Offline Points: 156 |
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The studs arent original. They are stainless from Gutsibits (I think I got them from). I dont have originals to compare them to. They have equal amounts of thread at both ends
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Kidneb
Falcone Joined: 24 Aug 2016 Location: Denmark Status: Offline Points: 70 |
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