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Chrome bore replacement. V7 850 GT

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Dukedesmo View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Dukedesmo Quote  Post ReplyReply Direct Link To This Post Posted: 18 Aug 2016 at 18:25
Originally posted by Dave P. Dave P. wrote:

Have you any experience of using re-plated cylinders? It is an interesting alternative.
 
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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italianmotor View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote italianmotor Quote  Post ReplyReply Direct Link To This Post Posted: 18 Aug 2016 at 19:27
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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Post Options Post Options   Thanks (0) Thanks(0)   Quote ReggieV Quote  Post ReplyReply Direct Link To This Post Posted: 19 Aug 2016 at 22:08
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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Post Options Post Options   Thanks (0) Thanks(0)   Quote ReggieV Quote  Post ReplyReply Direct Link To This Post Posted: 19 Aug 2016 at 23:01
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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Post Options Post Options   Thanks (0) Thanks(0)   Quote kateguy Quote  Post ReplyReply Direct Link To This Post Posted: 20 Aug 2016 at 09:29
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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Lemsteraak View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Lemsteraak Quote  Post ReplyReply Direct Link To This Post Posted: 26 Jan 2017 at 17:59
Dave,which part of the barrels have Gilardoni stamped on them again?
Moto Guzzi 1970 V7 Special
Laverda 1973 GT750
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Dave P. View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Dave P. Quote  Post ReplyReply Direct Link To This Post Posted: 26 Jan 2017 at 18:18
just above the bottom fin.It's cast into the barrel facing outwards.

Edited by Dave P. - 26 Jan 2017 at 19:07
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1971 V7 Special. 1972 850GT.
1970 T120 Bonnie. 2009 500 Bullet.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote ranton_rambler Quote  Post ReplyReply Direct Link To This Post Posted: 26 Jan 2017 at 21:37
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. View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Dave P. Quote  Post ReplyReply Direct Link To This Post Posted: 27 Jan 2017 at 10:14
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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1971 V7 Special. 1972 850GT.
1970 T120 Bonnie. 2009 500 Bullet.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote jmee54 Quote  Post ReplyReply Direct Link To This Post Posted: 27 Jan 2017 at 12:24
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. View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Dave P. Quote  Post ReplyReply Direct Link To This Post Posted: 27 Jan 2017 at 12:35
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
TO LIVE OUTSIDE THE LAW YOU MUST BE HONEST.

1971 V7 Special. 1972 850GT.
1970 T120 Bonnie. 2009 500 Bullet.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Lemsteraak Quote  Post ReplyReply Direct Link To This Post Posted: 27 Jan 2017 at 12:54
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....Confused
Moto Guzzi 1970 V7 Special
Laverda 1973 GT750
Laverda 1970 SF750
Laverda 1986 RGA1000 Sprint
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Dave P. View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Dave P. Quote  Post ReplyReply Direct Link To This Post Posted: 27 Jan 2017 at 13:11
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.
TO LIVE OUTSIDE THE LAW YOU MUST BE HONEST.

1971 V7 Special. 1972 850GT.
1970 T120 Bonnie. 2009 500 Bullet.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Lemsteraak Quote  Post ReplyReply Direct Link To This Post Posted: 27 Jan 2017 at 13:18
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.
Moto Guzzi 1970 V7 Special
Laverda 1973 GT750
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Laverda 1986 RGA1000 Sprint
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Dave P. View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Dave P. Quote  Post ReplyReply Direct Link To This Post Posted: 27 Jan 2017 at 13:35
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.
TO LIVE OUTSIDE THE LAW YOU MUST BE HONEST.

1971 V7 Special. 1972 850GT.
1970 T120 Bonnie. 2009 500 Bullet.
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