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774cc

dale decrescenzo

Tuned and Synch'ed
Joined
Sep 4, 2020
Messages
54
Location
Mo
Has anyone replaced a late model V7 crank with a V9 ?
Looking at the parts list, just about every thing is the same.
Con Rods, Crank beairngs, entire valve train....

the best i can figure is that a 1.5mm shim under the cylinders, and the same value added to the push rod length should net a 774cc engine.
 

Louisv97

Cruisin' Guzzisti
Joined
Jul 24, 2019
Messages
265
Location
Orange County
Has anyone replaced a late model V7 crank with a V9 ?
Looking at the parts list, just about every thing is the same.
Con Rods, Crank beairngs, entire valve train....

the best i can figure is that a 1.5mm shim under the cylinders, and the same value added to the push rod length should net a 774cc engine.
I’ve been trying to look for a used v9 engine with no luck
I’m curious too but my intentions are different
 

GTM®

Administrator
Staff member
GT di Razza Pura
Joined
Jul 1, 2009
Messages
12,460
Location
Malibu
Has anyone replaced a late model V7 crank with a V9 ?
Looking at the parts list, just about every thing is the same.
Con Rods, Crank beairngs, entire valve train....

the best i can figure is that a 1.5mm shim under the cylinders, and the same value added to the push rod length should net a 774cc engine.
I can't imagine you'd find even one, unless they swapped the entire motor... as the amount of work to do this is pretty immense. Question is why? The longer stroke motor is lazier. The GTM 820 pistons are drop in, and makes for a snappy fun motor. @Louisv97 has one, along with a few others here. Best bang for the $ you can do.

My next project is to drop a V85TT motor into a V7 frame, and mate it to the V9 swingarm/FD. Just in case Guzzi doesn't for 2021. 850 Le Mans, here we come. ;)
 

dale decrescenzo

Tuned and Synch'ed
Joined
Sep 4, 2020
Messages
54
Location
Mo
while trolling on E-Bay, I spotted a late model V7 crank assembly, and it got me wondering, so i thought i would ask.
I also found a V7 crank with solid big end con rods, like a 2 stroke ? what year/model was so equipped ?? and why ??
 

GTM®

Administrator
Staff member
GT di Razza Pura
Joined
Jul 1, 2009
Messages
12,460
Location
Malibu
I’m wondering if lighter connecting rods would help make the v7 rev a little quicker
No, that takes a lightened crank and flywheel. I did this in the 90's on Honda Hawk GT race motors. You don't want lighter and weaker con-rods. Either way, you'll have to rebalance the entire assembly. Again, anything can be done, just how much time and money to throw at it.
I was hoping you'd comment on how much fun the 820 kit is.
 

PokeyGuzzi

Tuned and Synch'ed
Joined
May 11, 2019
Messages
58
Location
Rhode Island
My next project is to drop a V85TT motor into a V7 frame, and mate it to the V9 swingarm/FD. Just in case Guzzi doesn't for 2021. 850 Le Mans, here we come. ;)

I’m eager to see how this turns out. Out of curiosity, what benefits do the V9 swingarm and final drive bring to the table?
 

Louisv97

Cruisin' Guzzisti
Joined
Jul 24, 2019
Messages
265
Location
Orange County
No, that takes a lightened crank and flywheel. I did this in the early 90's on some Hawk GT race motors. You don't want lighter and weaker con-rods. Either way, you'll have to rebalance the entire assembly. Again, anything can be done, just how much time and money to throw at it.
I was hoping you'd comment on how much fun the 820 kit is.
Oh the 820 kit is amazing. It does wonders to what felt a neutered engine. Brings it to life. By far the best mod i've done to my III.
I would never give up my III for anything. It's a keeper.
My issue is coming from myself, in that I want bring my III to a higher peak. Crazy I know, but it's something I want.
Which is why I was wondering where more power could be found.
@dale decrescenzo if you want more power without much fuss, Get Todd's kit. Believe me and the other guys on here who have posted reviews, it's the real deal
 

PepperoniBros.

Tuned and Synch'ed
Joined
Jul 29, 2011
Messages
57
Oh the 820 kit is amazing. It does wonders to what felt a neutered engine. Brings it to life. By far the best mod i've done to my III.
I would never give up my III for anything. It's a keeper.
My issue is coming from myself, in that I want bring my III to a higher peak. Crazy I know, but it's something I want.
Which is why I was wondering where more power could be found.
@dale decrescenzo if you want more power without much fuss, Get Todd's kit. Believe me and the other guys on here who have posted reviews, it's the real deal
Sounds like you want a cam.........
 

GTM®

Administrator
Staff member
GT di Razza Pura
Joined
Jul 1, 2009
Messages
12,460
Location
Malibu
If there was such a thing
There is, but unless you’re going racing, it’s pointless really. The stock cam is a really good street cam. The V7 III stock cam with my 820 kit and free-flowing exhaust, would be a touch over 60 rwhp. The V85TT has 66.7 rwhp stock, as shown below. Chris’ 820-4V I built makes 67.3 rwhp using the stock cam. Also shown below.

C0C9E24E-E19C-44A1-A1F4-A8C4D2BB958E.png

GTM V7-820-4V
683599EB-51CE-46EB-B34B-FBA0E599FFFC.jpeg
 

Louisv97

Cruisin' Guzzisti
Joined
Jul 24, 2019
Messages
265
Location
Orange County
When it's time to rebuild the engine in my III, I want to see how much I can throw at it. I'm not looking for crazy numbers, but I do want to see how much can be extracted out of it.
 
Last edited:

GTM®

Administrator
Staff member
GT di Razza Pura
Joined
Jul 1, 2009
Messages
12,460
Location
Malibu
When it's time to rebuild the engine in my III, I want to see how much I can throw at it. I'm not looking for crazy numbers, but I do want to see how much can be extracted out of it.
My forecast, with $$$$ and a fragile durability, is close to 70 rwhp. I’ll add as your motor sits, rebuild needs won’t likely be for a few hundred thousand miles.
 

Mayakovski

High Miler
GT Famiglia
Joined
Dec 17, 2017
Messages
762
Location
Comox, BC, CANADA
My forecast, with $$$$ and a fragile durability, is close to 70 rwhp. I’ll add as your motor sits, rebuild needs won’t likely be for a few hundred thousand miles.
I am curious what you mean by "fragile durability", I take you are saying that at that level the motor is delicate. Is that correct?
 

GTM®

Administrator
Staff member
GT di Razza Pura
Joined
Jul 1, 2009
Messages
12,460
Location
Malibu
I am curious what you mean by "fragile durability", I take you are saying that at that level the motor is delicate. Is that correct?
Stock they are decently robust. There’s many 100k+ mile small blocks out there.
If you try to extract power beyond what it was designed for, it will become increasingly fragile. My 820 kit with forged pistons is an improvement on stock, not a deficit. Beyond that, increased revs/power mostly means a much shorter life.
 

Mayakovski

High Miler
GT Famiglia
Joined
Dec 17, 2017
Messages
762
Location
Comox, BC, CANADA
Stock they are decently robust. There’s many 100k+ mile small blocks out there.
If you try to extract power beyond what it was designed for, it will become increasingly fragile. My 820 kit with forged pistons is an improvement on stock, not a deficit. Beyond that, increased revs/power mostly means a much shorter life.
I was hoping that was it. That 820cc kit is on my list, along with a full GTM exhaust system.
 
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