Medium valve with B10 jetting

[rutgery]

I've slowly been collecting pieces to convert my V7 sport to a more sporty machine (coming from a stock 949cc cali 3 engine). These include a set of higher domed pistons, ''medium'' (44/37mm) valve heads, a B10 camshaft and 36mm PHF carbs. This means that the engine layout will be the same as a SPIII with B10 cam or an opened up LMIII with B10. This setup might be the same as later 1000S' but I'm not sure about that. I'm using K&N pod filters and a LM1000 Lafranconi competitione exhaust. 

As for the jetting, starting with the stock jetting for a SPIII engine and working towards a LM1000 jetting might be a good idea, but I was hoping someone could give me their setup and jetting? Any input is greatly appriciated!

[Turin]

Sounds like this would be a great set up. Have you bought the B10 and carbs yet? you could get a lot more aggressive. Consider porting the heads?  What / where are the pistons from ?

Seems like a shame to put a square head hot rod motor in a V7 sport.

[1down5up]

Following with interest, I have a similar set up that is nearing completion (850 lemans with 949cc, high comp Pistons and a cam a bit bigger than a B10)

At the moment I have
K5 needle
265ab needle jet
145 mains
60/3 slide

Havnt run it yet to verify or tune it yet

[Turin]

Bigger than a B10... P3, X9 or X10 ?

My lemans SE has a 94mm bore, with high comp pistons, and a X8 cam ported heads. I will idle once it gets up to temp.

[rutgery]

Sounds like this would be a great set up. Have you bought the B10 and carbs yet? you could get a lot more aggressive. Consider porting the heads?  What / where are the pistons from ?

Seems like a shame to put a square head hot rod motor in a V7 sport.

Yes I've already got the parts, the pistons, heads & carbs are from a 1000 SP III but that doesn't originally run a B10 cam. The plan is to increase the power output a bit without decreasing the practical use and everyday drivability of the bike.

The bike is not a real V7 sport but a converted Cali 3, so it already has a square fin engine in it. Makes modifying the bike a little less of a shame
Here's the link to the build log of this bike: https://wildguzzi.com/forum/index.php?topic=95184.0

Following with interest, I have a similar set up that is nearing completion (850 lemans with 949cc, high comp Pistons and a cam a bit bigger than a B10)

At the moment I have
K5 needle
265ab needle jet
145 mains
60/3 slide

Havnt run it yet to verify or tune it yet

Thanks for the info. I've yet to recieve the heads back from the machinist but I'll keep you updated.
How did you decide to start with this jetting? I was considering starting with the following as it's a ''updated'' jetting for the SPIII
''K18 needle with clip on 3rd notch, idle jet 50, main jet 142, needle jet 268AB'' as mentioned here:
https://wildguzzi.com/forum/index.php?topic=88660.0

[1down5up]

Thanks for the info. I've yet to recieve the heads back from the machinist but I'll keep you updated.
How did you decide to start with this jetting? I was considering starting with the following as it's a ''updated'' jetting for the SPIII
''K18 needle with clip on 3rd notch, idle jet 50, main jet 142, needle jet 268AB'' as mentioned here:
https://wildguzzi.com/forum/index.php?topic=88660.0

Nothing to scientific, its pretty similar to my 850 lemans base settings, which I always thought was a bit on the ritch side. It's up a bit on the mains

[Turin]

when I put phf36's on my sportified 850T, I kept the jetting they came with ( spIII ? ) ran well. ran better with the Norris S cam, and even better after the head porting and compression ratio increase via head and base gaskets. I don't remember what jets are in there, but stock jetting wasn't far off.
Post a pick of your bike!

[rutgery]

when I put phf36's on my sportified 850T, I kept the jetting they came with ( spIII ? ) ran well. ran better with the Norris S cam, and even better after the head porting and compression ratio increase via head and base gaskets. I don't remember what jets are in there, but stock jetting wasn't far off.
Post a pick of your bike!

What kind of manifolds did you use on the 850T if you don't mind me asking? There are many who swear using 36mms on stock small valve heads won't produce significant gains while others claim the exact opposite. I know HMB makes the tapered manifolds which may or may not help. Did you use copper gaskets to increase the CR?

Here she is:

[pete mcgee]

Are the carbs the lean burn type off a mk 3 lemans ( they have a brass semicircular shroud around the needle jet apature On the floor of the carb body) or the ones without?
My mk 3
Mains 122
Pilot 58
Needle k18 3rd notch
Needle jet ab 268
Standard float height
In running foam airfilters,  staintune exhaust
Twin plug heads

[Turin]

Delrin manifolds. available from the usual suspects.
Copper base and head gaskets https://coppergaskets.us/. I'm at .044 squish.
I did a home Dremel port when I installed the carbs just to eliminate the lip. When I switched over to gilardoni's, I had the heads fully refreshed and fully ported by a pro. She pulls really well now. Still running the stock flywheel.

I was after a mild, fun street engine.  You can go a heck of a lot further, and still have a streetable bike.

[rutgery]

Are the carbs the lean burn type off a mk 3 lemans ( they have a brass semicircular shroud around the needle jet apature On the floor of the carb body) or the ones without?
My mk 3
Mains 122
Pilot 58
Needle k18 3rd notch
Needle jet ab 268
Standard float height
In running foam airfilters,  staintune exhaust
Twin plug heads

I assume your 36' are lean burn? What exactly changes with the jetting of lean burn vs normal carbs, only a smaller main jet? Mine are not lean burn, as these are european delivered motorcycles.

[moto-uno]

  Any of these jettings will have it running ok to great , but nobody has asked about what altitude you live and ride at ?
The mains might be a bit small from my experience at mostly sea level riding . However I have an old BUB system with 1 5/8 "
header pipes and 40mm dellortos . It's a LeMans2 with 89mm high compression Wiseco pistons with a Mega Cycle cam ,
(the duplicate of an old Norris SS cam) and twin plug heads . Had a B-10 cam previously and on the street it wasn't all that
noticeable , power wise . Runs well ( and strong over 4000 rpm ), but low speed performance is kinda soft , what else would
one expect really . In some previous post I showed the dyno figures from it . Got 70 rear wheel horsepower and have been
driving it for over 150k kilometers this way . I rode a friends Le Mans 2 which only had stock headers and Lafranconis' and
K&N air filters , plus professionally ported heads and it was almost a fast as mine (for an awful lot less money) and ran great
throughout the rev range . I'd have done mine differently if I'd ridden his first  , Peter

[rutgery]

  Any of these jettings will have it running ok to great , but nobody has asked about what altitude you live and ride at ?
The mains might be a bit small from my experience at mostly sea level riding . However I have an old BUB system with 1 5/8 "
header pipes and 40mm dellortos . It's a LeMans2 with 89mm high compression Wiseco pistons with a Mega Cycle cam ,
(the duplicate of an old Norris SS cam) and twin plug heads . Had a B-10 cam previously and on the street it wasn't all that
noticeable , power wise . Runs well ( and strong over 4000 rpm ), but low speed performance is kinda soft , what else would
one expect really . In some previous post I showed the dyno figures from it . Got 70 rear wheel horsepower and have been
driving it for over 150k kilometers this way . I rode a friends Le Mans 2 which only had stock headers and Lafranconis' and
K&N air filters , plus professionally ported heads and it was almost a fast as mine (for an awful lot less money) and ran great
throughout the rev range . I'd have done mine differently if I'd ridden his first  , Peter

Thanks for the heads up about the altitude Peter! I live in the Netherlands so you probably won't get closer to sea level than in this country. Did your friend ride his LM2 before the port job with the same exhaust and filters? I'm wondering about how much of an impact porting the heads will have. I do know proper filters and exhaust (especially the Lafranconi's) add a surprising amount of power.

[moto-uno]

  The fellow with the other LeMans 2 actually worked with me at one of the motorcycle dealerships in Ottawa . We both
owned them from new ( and bone stock ) . Actually they were painfully slow accelerating stock , but given enough highway
they could build up a good top speed . We both started spending money on performance at the same time . He went straight
to the exhaust and air filters plus porting . I went with the same exhaust (Lafranconnis) and air filters , but I also went with the
40mm dellortos and b-10 cam . His was disturbingly faster accelerating . The next year I had bigger cylinder sleeves installed and
the cases bored (I had thicker sleeves installed) , and 89mm high compression pistons fitted and twin plugged the heads . Then
mine would accelerate a bit faster ( more torque , I figure from the 990cc displacement) , but I don't think it had any more top
speed . So  what I'm suggesting is much more bang for the buck comes from professional head porting , if they don't have a flow
bench , I'd be a bit hesitant . Unfortunately , most of the big names in Guzzi performance when I was doing this are long gone .
Peter