Monoblocks vs Concentrics 650SS

I've decided just to make life easy and just run concentrics like the later 650ss had.

Looking at filtration options now. The Atlas air cleaner would work but it looks like a PITA and heavy.

There is always the option of short belmouths with screens and gauze.
 
elefantrider said:
I've decided just to make life easy and just run concentrics like the later 650ss had.

Looking at filtration options now. The Atlas air cleaner would work but it looks like a PITA and heavy.

There is always the option of short belmouths with screens and gauze.
Click to expand...
Screening a belmouth is known to cause a richer mixture I believe?
 
What Mike said :) chopped on the 650ss before the Concentrics, I’m running brand new Amal chopped on mine with the insert sleeves to sleeve the intakes down had them on for 4 years n 4 winters n been great.

If you anyone gets new premier Concentrics for the 650ss make sure they fit the right pilot jets had me chasing my tail when I used to have them on the 650ss till I double checked them.

Switched over to the Monoblocs as mines a very late 66’ reg 67 she originally was spec’s with monoblocs

i bought from the original owner, had a single carb conversion on it. N stuck the premiers rejetted on my early 68 Commando​
 
Hi I believe no filter as an option, on my 1963 650ss I fitted a later Atlas filter, pain in but though, bugger all room.
Burgs
 
The Lawton Wilson Production race winning 650 1962 bike used 1 1/16 Monos wirh std bell mouths and steel manifold sleeves , Later pictures show it with 2 inch trumpets. It could well have had the Alcohol float valves .
 
Glen, are you using the "standard" commando K&N filter, or the thinner knockoffs that CNW (and British Cycle) sells for the CNW electric starter setup?
 
This is the one I used. It's a tight fit!

Glen
Monoblocks vs Concentrics 650SS
 
I think we have gotten away from the original posted question, Monoblock or Concentric, which is best on a 650SS? I have used both types, I like the Monoblock on single carb applications as it's just so easy to adjust the idle speed when the bike is a bit cold. On my 1967 650SS I have two 28mm Concentrics on it, they are new Amal carbs with the aluminium bodies rather than the monkey metal originals. The bike runs superbly and would not replace them with Monoblock's. Performance wise, buy a GSXR1000 if that's what's important to you. My old bike runs really well with smallish Concentrics on it .
 
savingclassicmotorcycles said:
What Mike said :) chopped on the 650ss before the Concentrics, I’m running brand new Amal chopped on mine with the insert sleeves to sleeve the intakes down had them on for 4 years n 4 winters n been great.

If you anyone gets new premier Concentrics for the 650ss make sure they fit the right pilot jets had me chasing my tail when I used to have them on the 650ss till I double checked them.

Switched over to the Monoblocs as mines a very late 66’ reg 67 she originally was spec’s with monoblocs

i bought from the original owner, had a single carb conversion on it. N stuck the premiers rejetted on my early 68 Commando​
Click to expand...
what were the jets that you had that made it run best?
 
They had one size to small compared to the Norton book settings so just went to that :) worth checking incase they are still sending the out wrong did that before switching to the monoblocs.
 

Similar threads

savingclassicmotorcycles
From 22 to mid 30s Norton Passion and Restoration Norton 1927 16H Flat Tanker, Norton RAF 1944 WD16H, Norton Commando 1968, Norton 650ss 1967
2 3 4 5 6 7
Replies
134
Views
9,641
savingclassicmotorcycles
savingclassicmotorcycles
P
Monoblocks throttle cables
Replies
5
Views
2,281
annajeannette
annajeannette
Britstuff
1962 Norton 650SS. Chopped 376 Monoblocs. Rough idle when hot. Change pilot jet?
2
Replies
36
Views
4,652
baz
baz
Britstuff
Twin Amal 376 Chopped Monobloc Carburetters connecting fuel line / tube. Norton 650SS
Replies
10
Views
2,240
Bernhard
B
D
Concentric carbs
Replies
9
Views
2,348
Dccycleworks
D
Back
Top