Chrome bore replacement. V7 850 GT |
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Dukedesmo
Senior Member Joined: 17 Apr 2015 Location: Leics Status: Offline Points: 856 |
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I've had Ducati cylinders replated due to wear and another set bored/plated both by Langcourt, both are working fine. They can make worn or damaged cylinders as good as new for significantly less cost than buying new and you get to keep the bike original... I fitted a (big bore) Gilardoni kit to my LM2 when I had a valve to piston interface but only because it was the pistons that were damaged and I couldn't find any new 850cc pistons (the cylinders were actually OK but I would have been happy to repair if not), the Gilardoni kit was a straightforward fit and works very well but it is an expensive way of replacing the cylinders, assuming everything else is OK.
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Le Mans 2
Ducati 916 Ducati M900 |
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italianmotor
Senior Member Joined: 14 May 2014 Location: UK Status: Offline Points: 2101 |
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I've looked into replating several times over the years, and quite recently too as I have another 750 S3 that needs an engine rebuild, (and I have some sets of worn chrome barrels on the shelf) but have come to the conclusion that the amount you save is just not really worth it, I think it was about 60 quid or so - that said, the cost of the kits has gone up slightly because of the less favourable exchange rate. The original pistons going back in need to be perfect, as do the rings, and sets of rings are not cheap nowadays either. The S3 will need a complete rebuild so I think the Gilardoni kits give peace of mind on what (one day...) will no doubt be a costly restoration.
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Guzzi lover doing my own thing: http://www.italianmotormagazine.com
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ReggieV
Senior Member Joined: 12 Oct 2014 Location: Leeds,Yorkshire Status: Offline Points: 456 |
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Dave P wrote; "May one ask where this bike is/was advertised? I 'd like butcher's myself. "The (bikes) were at "Made in Italy motorcycles."
They have a V7 850 California, 2 X red V7 850 Gt's of which one isn't shown on their site and they also have an 850 T3 California and an 850T. It's a great showroom full of interesting bikes. Sorry about the late reply but I don't seem to have had emails saying that there have been more replies?
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ReggieV
Senior Member Joined: 12 Oct 2014 Location: Leeds,Yorkshire Status: Offline Points: 456 |
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Also they had 2 X Le Mans 1's, the one advertised which I would describe as reasonable and also a really nicely and obviously well cared for LM1 which for some reason isn't being advertised yet, a V7 sport and a Convert plus a "Radical Guzzi" which I believe was built in Germany.
Definitely a worthwhile trip to see all of these bikes plus some other Italian (and 2 x British) exotica.
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kateguy
Senior Member Joined: 24 Nov 2014 Location: uk Status: Offline Points: 984 |
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And John Fallon is a very hospitable chap...he gets the kettle on and has a natter if the fone aint ringin...
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Moto Guzzi Club GB.....
850 LE MANS...1 & 2....V7 Loop Frame..V7 Sport replica...Guzzi Daytona...Ducati 900ss Bevel not belt.....Laverda 3C ....and an MZ... |
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Lemsteraak
Falcone Joined: 12 Jan 2017 Location: Tiverton ,Devon Status: Offline Points: 76 |
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Dave,which part of the barrels have Gilardoni stamped on them again?
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Moto Guzzi 1970 V7 Special
Laverda 1973 GT750 Laverda 1970 SF750 Laverda 1986 RGA1000 Sprint |
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Dave P.
Senior Member Joined: 12 Jan 2015 Location: Northants Status: Offline Points: 5573 |
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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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ranton_rambler
Senior Member Joined: 13 Feb 2015 Location: Stafford Status: Offline Points: 1147 |
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I think mine has still got it's original chrome bores. Some people are paranoid about it but I'm not going to do anything about it until something goes wrong. No bits in the sump last time I dropped it, and I'll be doing it again shortly.
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Dave P.
Senior Member Joined: 12 Jan 2015 Location: Northants Status: Offline Points: 5573 |
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I replaced the pots on both of my Loops.The 750 ones were worn out anyway, no flaking though.The 850 I did as a matter of course having read V7 Johns'account of what happens when the chrome lets go.My fear would be that finding chrome in the oil could be a signal that says "too late!!"
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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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jmee54
Senior Member Joined: 28 Nov 2014 Location: Cornwall Status: Offline Points: 1469 |
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I have replaced with Gilardoni sets, on both my Eldorado and Ambassador. If a bike has been standing for some time it is prudent not to start it till the bores have been checked. Once chrome has been circulated around the engine it is a major strip down to check and remove it, with all the costs of bearings and seals etc. Generally if a bike is well used and its history is known well, it stands a good chance of being ok - BUT if like me you are importing something you are unfamiliar with it is worth the money for peace of mind. One of my bikes had good bores, the other not!
I think, after reading all the posts on the "Loopframe_Guzzi" Yahoo site, by people in the US who are vastly experienced in Loops, Charlie "Amboman" on this site being one, I fall into the category of the "paranoid" owner. It is just not worth the risk. |
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Dave P.
Senior Member Joined: 12 Jan 2015 Location: Northants Status: Offline Points: 5573 |
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I think the only "middle way" might be to remove the heads and check the bores for lifting chrome.You will be able to see most of the area swept by the top ring but not the lower part swept by the other rings, also bearing in mind that some pistons had a fourth ring .
Having said that I wouldn't take that course of action. I agree entirely with jmee54 above. Of course, if you do remove the heads, you may as well just pull off the pots and have a proper look. Edited by Dave P. - 27 Jan 2017 at 12:44 |
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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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Lemsteraak
Falcone Joined: 12 Jan 2017 Location: Tiverton ,Devon Status: Offline Points: 76 |
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Well mine are original,it"s a very clean looking engine,4700Kms but now I ve sold my TS1200 I ll go ahead and order the Gilardonis next week,I ve had the bike ticking over so I ll do an oil change and see.
May need some help on the process though.... |
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Moto Guzzi 1970 V7 Special
Laverda 1973 GT750 Laverda 1970 SF750 Laverda 1986 RGA1000 Sprint |
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Dave P.
Senior Member Joined: 12 Jan 2015 Location: Northants Status: Offline Points: 5573 |
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Good decision Shaun.When you remove the pots you will be able to check the cam followers too.Top end work on a Guzzi is much simpler than on a Laverda.
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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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Lemsteraak
Falcone Joined: 12 Jan 2017 Location: Tiverton ,Devon Status: Offline Points: 76 |
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do I need any special tools ?,sorry if this sounds dumb, rings clamps for instance etc.I ve the online download for Chilterns but will wait until Johns hard copy is with me.
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Moto Guzzi 1970 V7 Special
Laverda 1973 GT750 Laverda 1970 SF750 Laverda 1986 RGA1000 Sprint |
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Dave P.
Senior Member Joined: 12 Jan 2015 Location: Northants Status: Offline Points: 5573 |
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Yes, one piston ring clamp and er...thats it.
I found the easiest way to fit the new barrels is to fit the piston to the pot on the bench first with just enough of the skirt projecting out of the bottom of the pot to make the gudgeon pin hole accessible.Have the rearward circlip in place already, slide the barrel /piston assembly down the studs, line up the rod with the gudgeon pin hole and push the pin home.Fit the remaining circlip.....push the barrel home. That's also the easier way with Laverdas,IMHO. |
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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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