Leaded head conversion

chris-red · Have you considered a TDM? Joined: 21 Sep 2005 Karma :

Struggling to find much info on the net.

Anyone have a rough idea how much a leaded head conversion would cost for a 2 valve per cylinder twin?

Also where is good? Somewhere in Essex would be Ideal.
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MarJay · But it's British! Joined: 15 Sep 2003 Karma :

You want to take out hard valve seats and replace them with soft ones that require unleaded petrol? Confused

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chris-red · Have you considered a TDM? Joined: 21 Sep 2005 Karma :

.Chris. · World Chat Champion Joined: 09 Jun 2007 Karma :

I had a car head reconditioned and converted to unleaded at Cambridge Rebores about 5 years ago. Cost about £150, which included new valves and guides. That was for an 8 valve cast iron head.

Little bit of a trek from Essex, but not too far depending on where in the county you are.
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Chris
1985 Kawasaki Z550F

Kickstart · The Oracle Joined: 04 Feb 2002 Karma :

Hi

If for a bike worth asking SEP possibly:-

https://www.sep-kegworth.co.uk/page1.htm

To be honest if it were for a limited use bike I would just use one of the fuel additives until such a time as the seats needed attention anyway.

All the best

Keith
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chris-red · Have you considered a TDM? Joined: 21 Sep 2005 Karma :

Kickstart · The Oracle Joined: 04 Feb 2002 Karma :

Hi

Surprised it killed it that quickly.

What engine is it? Presume some old British air cooled twin.

All the best

Keith
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Traxpics, track day and racing photographs - Bimota Forum - Bike performance / thrust graphs for choosing gearing

chris-red · Have you considered a TDM? Joined: 21 Sep 2005 Karma :

Babba · Banned Joined: 05 Jan 2012 Karma :

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

Surely you want an unleaded conversion rather than leaded?
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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.

Kickstart · The Oracle Joined: 04 Feb 2002 Karma :

chris-red · Have you considered a TDM? Joined: 21 Sep 2005 Karma :

chris-red · Have you considered a TDM? Joined: 21 Sep 2005 Karma :

stinkwheel · Bovine Proctologist Joined: 12 Jul 2004 Karma :

I would surmise that it is not a valve seat failure but some other problem.

If the valve seats had receeded, the tappets would have kept closing up and you'd lose compression. It would almost certainly come on gradually with a steady loss of compression, an increasing tendancy to pop and bang on the overrun and blueing of the header pipes.

By all means get hardened seats done but I'd have a carefull look first because your problem almost certainly lies elsewhere.

After 1000 miles, there would probably still be quite a bit of lead/substitute hanging about. I also know people with much older brit bikes who say the whole conversion thing is a waste of time and just carry on running them in standard trim on unleaded.

Easy enough to check anyway. Exhaust valve seat recession should be easy to see if you whip the head and valve off.

SRM will charge you £94.82 + VAT to fit hardened exhaust valve seats to a Triumph twin. A good friend had a lot of serious tuning work done by them on his A65 and it was top quality. I have personally been overtaken by it while I was flat-out on my GPZ500.
https://www.srmclassicbikes.com/
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chris-red · Have you considered a TDM? Joined: 21 Sep 2005 Karma :

I'll whip the head off and have a look this weekend cheers.
____________________
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.

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