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'76 V7Sport (750-S3) resto-mod project

ChopSauce

Tuned and Synch'ed
Joined
Jun 29, 2012
Messages
50
Location
So Paris (France)
Sorry for the purists! Please consider that I am trying to vitalise some dead parts, rather than dismantle a collectable:

- I received an incomplete collection of pretty damaged parts from a 750-S3 which had been the subject of severe abuse over the years. The back of the frame was warped (slightly, though), the engine was butchered, the electricity was ... well, let's say poor, and almost any remaining bit (heads, footpegs, levers, etc) had been crushed.

Under the pressure of Guzzi enthusiasts willing to preserve what they considered being an historical treasure, the bike has been for sale since 2005, but nobody sensible ever wanted to buy or trade her for a decent amount - hence this project.

My intention, now, is to build a (72) vintage looking road bike - no cafe racer, here - with the biggest engine I can afford.

So far I am willing to use an 1100 engine with a Ducati charging system but I am not aware of all the issues with this electrical system.

I wish you could educate my on this, please.

27D52FD2 B158 42BE B041 7A70830992F4
 
The Ducati alternator has two wires only; if you get a regulator/rectifier(preferably the better quality aftermarket types) that goes with it and you tie the charge wire to your battery, you should be set. Your original rectifier and regulator can go on the shelf. Crankcase venting might be a bit different as well, depending on what engine you decide to use. Other than that I don't see many obstacles.
Get the later type deep spline clutch plates and hub as well.
https://scrambler-cycle.myshopify.c...peed-big-twins-4mm-deep-spline-plates-and-hub
 
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Thanks for your reply and the clutch tip!

I saw I have many options, yes - including keeping the Bosch charging system(1) but I'm still not sure at which engine I would be better buying.

I found a cheaper 1000 Calif engine with a lower mileage. Less fun but it better fits my budget.

A 1000 engine should be a sensible choice for a road bike, too.

I have a few parts (sporty camshaft, 34mm carbs and V11 flywheel) to energize it a bit, anyway.

Still I'll have to post some pics. Too bad I can't link to my own images.
___

(1) Does it seem, but I couldn't find much details about the mod.
 
Thanks for your reply and the clutch tip!

I saw I have many options, yes - including keeping the Bosch charging system(1) but I'm still not sure at which engine I would be better buying.

I found a cheaper 1000 Calif engine with a lower mileage. Less fun but it better fits my budget.

A 1000 engine should be a sensible choice for a road bike, too.

I have a few parts (sporty camshaft, 34mm carbs and V11 flywheel) to energize it a bit, anyway.

Still I'll have to post some pics. Too bad I can't link to my own images.
___

(1) Does it seem, but I couldn't find much details about the mod.

If you use the V7 sport cam, make sure to chamfer the inner conrod bolts a few millimeter; or you will get interference at high rpm's due to camshaft flex, which will be expensive....
 
Er, sorry. I'm not sure I got it, but I have a kind of P3 (with an updated / more modern profile) so I'll check more than carefully, thanks!

You can, just make sure it ends in jpg, tif, etc... however, best to just upload to our server here. See; https://www.guzzitech.com/forums/threads/picture-uploads-gt-storage.17093/

OK: the images on my homepage have an uppercase extension prefix, which doesn't seem to be recognised.

One last thing. Speaking about the gauges pictured above, it seems that they are repro ones - with V7 needles - and V7 Sport like faces.

I've been willing to do the same thing.

I found a gauge builder, which could be able to make repro faces like above - but it is rather expensive (~190$/piece) if I don't order at least 10 of each - which would make around 45$/piece - but this is too much for just myself!

I'm sure some guys in the US are able to make repro faces and I look forward to reading about that, possibly.
 
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Problem with higher lift cams can be that you won't get interference between cam lobes and connecting rod bolt heads on the work bench, only at high rpm when the cam flexes, at which time it is too late. Simply grinding an angle on the bolt heads(can be done by hand with a bench grinder) can prevent an expensive oops. Once you assemble the engine and rotate it without cylinders you'll see what I mean. The cam lives in the V between the two connecting rods where space is tight when the crankshaft is in the 12 o'clock position
 
Slightly reworked an Agostini repro seat I wasn't very happy with

DSC05699

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The cordura on the back because I had it handy and couldn't find a matching vinyl fabric.

Once you assemble the engine and rotate it without cylinders you'll see what I mean.

I wasn't sure but yes, I'll do that! I would have done this is anyway, and had checked everything at least twice but this was worth mentionning - thanks!
 
Now that I can make the images appear, a few more details about the back.

Short rear fender with stainless steel hinge

DSC05627

and matching (pie cut, reweld) rear light / license plate holder - to accomodate the new fender slope

DSC05632

I can hardly wait to see how it looks - but I'll have to -
 
Finally, the engine will be a 950 square fins one, from a California II. The engine shows excellent compressions and was trustily (by TLM, NL) claimed having only 50 000 km, approximately.

It was fairly unexpensive, but it doesn't look nice at all.
DSC07815

I'm going to revamp it, somewhat.

The bottom end seems straightfoward (P3 style camshaft, V11 flywheel, brand new chain & tensionner, oil pump, tappets, etc) but I'm not sure about the distribution.

From just looking under the rocker covers all seems really fine - and the 12.5:1 compressions confirm - but I also have new replacement rockers and axles available at hand, that were originally bought to restore the 750 engine.

So, I don't know what's best:

- keep (approx) 50 000 km original Guzzi parts that seem to work just fine or put in new replacement(non original) parts - from Stein Dinse, Germany ?

Any advice/comments/criticism ?
 
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