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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: 29 Dec 2020 at 15:51
Hmm, that's interesting Norm'. You got me wondering so I've just been down to the shed to check the boxes that my Gillardoni kits came in. On the boxes for the 850GT kit is a label stating 83mm bore for T3 and V7850GT. The boxes that the V7 Special kits came in have no model identifying labels.I assumed that they were and probably are correct, but even if they had been 82.5mm piston and bore would that have made any difference to fitting and running them?
Charlie ????
TO LIVE OUTSIDE THE LAW YOU MUST BE HONEST.

1971 V7 Special. 1972 850GT.
1970 T120 Bonnie. 2009 500 Bullet.
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Normskii View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Normskii Quote  Post ReplyReply Direct Link To This Post Posted: 29 Dec 2020 at 17:19
If the pistons are the right height shape etc then being .5mm undersized in corresponding bores shouldn’t matter. I’ve never felt that having a 20thou rebore made a noticeable performance increase other than that from correcting previous wear. 
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james58 View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote james58 Quote  Post ReplyReply Direct Link To This Post Posted: 31 Mar 2021 at 20:42
Hi Amboman is it true that v7 sport cylinder kits will fit a v7 special HMB guzzi gave out this info. What would be the difference between the 2 kits I know the specials size is an 83 m and the sport 82.5 would the compression be different ?

Thanks James
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Amboman Quote  Post ReplyReply Direct Link To This Post Posted: 01 Apr 2021 at 14:11
Yes, I've installed V7 Sport kits in an Ambassador engine and they worked well. The only real differences are the V7 Sport pistons have a relief in the crown for intake valve clearance and the compression ratio is slightly higher (9.6:1 vs. 9.2:1 if I remember correctly).


Charlie
'69 Ambassador,'71 Ambassador,'73 Eldorado,'75 Eldorado police,'76 Convert,'77 Morini 3 1/2 Strada,'81 Ducati 500SL Pantah

http://www.AntietamClassicCycle.com
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james58 View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote james58 Quote  Post ReplyReply Direct Link To This Post Posted: 02 Apr 2021 at 09:22
Thanks for that Amboman

 Is there any reason you fitted the sport kit does it give you a little better performance ?

What are the most compatible big ends you could get eg I think the original setup is a little hard to come by I think MG says that the ones he sells the holes don't line up, any idea on this ?

Thanks James
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Amboman Quote  Post ReplyReply Direct Link To This Post Posted: 02 Apr 2021 at 14:49
The reason I used the 'Sport kits instead of Ambo kits was due to the latter being unavailable at the time with no ETA on the next batch. It did give a little better performance, which was handy since the bike had a huge sidecar attached.

These are the connecting rod bearing shells I use:

These could be used as well, one would just need to drill the oil hole if necessary:
Charlie
'69 Ambassador,'71 Ambassador,'73 Eldorado,'75 Eldorado police,'76 Convert,'77 Morini 3 1/2 Strada,'81 Ducati 500SL Pantah

http://www.AntietamClassicCycle.com
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