23t gearbox sprocket. Problems or not. (2013)

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My 850 runs 3800 at 70mph. Exactly what gearing I don't know because it has a BNR belt and a TTI five speed with a lower
first gear set.
The rpm at cruise is fine on a level playing field for a wee lad flying solo. As I live in hilly country long pulls really need to go down to 4th but it isn't absolutely necessary just thinking of the load on the engine etc. If you are a hotshoe then it really is a tad too high. My T150v Trident runs 4200 at 70 but it is heavier and more of a revver .
So much depends on how you ride, where you ride and how much your all up weight is. If your riding covers the whole spectrum then you make your choice on which area gets the most time.
 
I’ve got two mates with Enfields but they both have open pipes of different kinds. I wouldn’t have thought that made much difference, but maybe it does?
They need revs though. And when you rev them, they go.
If you were to put your single carb Commnado on the Dyno I think you might be surprised how much power it actually makes at 5,000 - 5,500rpm, like 30 sumthin…
 
Onder said:
My 850 runs 3800 at 70mph. Exactly what gearing I don't know because it has a BNR belt and a TTI five speed with a lower
first gear set.
The rpm at cruise is fine on a level playing field for a wee lad flying solo. As I live in hilly country long pulls really need to go down to 4th but it isn't absolutely necessary just thinking of the load on the engine etc. If you are a hotshoe then it really is a tad too high. My T150v Trident runs 4200 at 70 but it is heavier and more of a revver .
So much depends on how you ride, where you ride and how much your all up weight is. If your riding covers the whole spectrum then you make your choice on which area gets the most time.
Click to expand...
I once raised the gearing on my stock T160. The intention was to lower the rpm at a fast cruise.
I did John O Groats to Lands End with a mate on a modern Triumph. No motorways.
But the gearing made it so flat that I ended up doing most of the entire ride in no more than 4th gear to keep the revs up so the thing would go !!
DOH!
 
You neglected to bore to 850! And a T150v is lighter anyway.
But I rode 150 miles last week on my T150v A and B roads Kernow to North Devon and back. Most riding was less than 60 mph.
Cool temps low traffic but I don't ride these roads everyday so unsure of what is around each corner in addition to the possible
gravel, mud (they are plowing now) floods pushbike fanatics and suburban visitors in SUVs. You can stay in high gear most of the time but grabbing fourth will wise at times.
This was only an afternoon ride not a long journey where you need to keep your speeds up. Again, all depends on what kind of riding you do.
 
Onder said:
You neglected to bore to 850! And a T150v is lighter anyway.
Click to expand...
Not so fast cowboy…

I fitted a Neil Beadling 850 kit and got Neil to port the head shortly afterwards!

And with the e start detritus all removed, along with other none value add detritus, I doubt it was heavier than a T150 !
 
Oh dear, another stealth T160! Well then you need to back away from the deserts table! Poor old thing having to drag you about with tall gearing. What final sprockets were you running? Any idea of final weight of bike after lightening?
 
Fast Eddie said:
I’ve got two mates with Enfields but they both have open pipes of different kinds. I wouldn’t have thought that made much difference, but maybe it does?
They need revs though. And when you rev them, they go.
If you were to put your single carb Commnado on the Dyno I think you might be surprised how much power it actually makes at 5,000 - 5,500rpm, like 30 sumthin…
Click to expand...
I'm usually well below 5,000rpm. At nearly 50yo, I can't bring myself to rev it beyond that, it doesn't seem fair!

At 3500 revs at 70, in top, it accelerates fine to overtake when needed. Amazing how little power is needed, good torque curve I guess. The Enfield has a DNA filter, I can't remember which slip-ons. Sounds very nice. It still drops back though. We're not racers / track day experts. Just noticeable on parts of a ride where we press on, on our favourite local roads. When we do, I've not found the higher gearing hampers my enjoyment and my bike doesn't embarrass! It makes me grin.
 
Onder said:
Oh dear, another stealth T160! Well then you need to back away from the deserts table! Poor old thing having to drag you about with tall gearing. What final sprockets were you running? Any idea of final weight of bike after lightening?
Click to expand...
‘‘Twas a few years ago. Can’t really remember any details other than you’re right in that my lard undoubtedly increased the load !
 
Mart UK said:
I'm usually well below 5,000rpm. At nearly 50yo, I can't bring myself to rev it beyond that, it doesn't seem fair!

At 3500 revs at 70, in top, it accelerates fine to overtake when needed. Amazing how little power is needed, good torque curve I guess. The Enfield has a DNA filter, I can't remember which slip-ons. Sounds very nice. It still drops back though. We're not racers / track day experts. Just noticeable on parts of a ride where we press on, on our favourite local roads. When we do, I've not found the higher gearing hampers my enjoyment and my bike doesn't embarrass! It makes me grin.
Click to expand...
Sounds to me like your riding style suits the big sprocket. Riding the torque curve rather than chasing the power. And nowt wrong with that (assuming you’ve already done the lay shaft bearing that is)?!
 
Well that usually indicates a successful marriage! :)
My T150v is very stock appearing and I'd love to do up another as a lightweight version. My Rickman Enfield really opened my eyes to weight shedding.
 
Fast Eddie said:
Sounds to me like your riding style suits the big sprocket. Riding the torque curve rather than chasing the power. And nowt wrong with that (assuming you’ve already done the lay shaft bearing that is)?!
Click to expand...
Yes, I'm not a 4cyl fan really. Great engineering, but wrong feel, for me. Layshaft bearing point wasn't something I was aware of when I bought my bike. It looks like it is important, so I checked the POs restoration accounts. It was replaced 5,000 miles ago with a roller bearing (from RGM, IIRC). Had a new gearbox case at the same time, due to wear at that point. So, fingers crossed!
 
Mart UK said:
Yes, I'm not a 4cyl fan really. Great engineering, but wrong feel, for me. Layshaft bearing point wasn't something I was aware of when I bought my bike. It looks like it is important, so I checked the POs restoration accounts. It was replaced 5,000 miles ago with a roller bearing (from RGM, IIRC). Had a new gearbox case at the same time, due to wear at that point. So, fingers crossed!
Click to expand...
Sounds like you’re sorted !
 
Fast Eddie said:
I’ve got two mates with Enfields but they both have open pipes of different kinds. I wouldn’t have thought that made much difference, but maybe it does?
They need revs though. And when you rev them, they go.
If you were to put your single carb Commnado on the Dyno I think you might be surprised how much power it actually makes at 5,000 - 5,500rpm, like 30 sumthin…
Click to expand...
Add some black caps and I doubt she would crack 30!

At least that is what the hill is telling me.
I would love to try out a single carb on the hill sometime.
I guess we already know from Comnoz testing.
Somewhere around 35 -37rwhp with a single carb.

Glen
 
worntorn said:
Add some black caps and I doubt she would crack 30!

At least that is what the hill is telling me.
I would love to try out a single carb on the hill sometime.
I guess we already know from Comnoz testing.
Somewhere around 35 -37rwhp with a single carb.

Glen
Click to expand...
Careful we are drifting into single carb verses dual carbs again!!
Then I will have to bore everyone with how good a tm 40 is and how bad a VM 34 or 36 is in comparison again!!!!! :rolleyes: :rolleyes: :D:D:D
 
Getting slightly more on topic. Anyone have experience with a 20T or 21T on a '72 vs. 19T. Want to keep it near stock (performance wise), but don't think i need/want 19T
 
TomU said:
Getting slightly more on topic. Anyone have experience with a 20T or 21T on a '72 vs. 19T. Want to keep it near stock (performance wise), but don't think i need/want 19T
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I runna 21 with a std ratio belt drive primary and like it better than a 19. It runs about 4000 rpm at 70 mph. It dropped about 500 rpm at cruse. It still starts off ok even 2 up. I would not go back to a 19 as it just has the motor running to fast for my liking.
 
worntorn said:
Add some black caps and I doubt she would crack 30!

At least that is what the hill is telling me.
I would love to try out a single carb on the hill sometime.
I guess we already know from Comnoz testing.
Somewhere around 35 -37rwhp with a single carb.

Glen
Click to expand...
Glen,

Have enjoyed reading your stator heat and 'Dunstall and others' exhaust tests on Dyno hill. Respectfully suggest doing a similar thread for single/twin carbs, Amal mk2, SU, Mikuni, Concentric would make for brilliant real world reading! Ok thread derail over...
 
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