I don't have a Dyno Hill so...

robs ss

robs ss

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...there's a relatively quiet 3.5 km straight with a short downhill at one end (the Start),
...and I, amazingly, have no demerit points against my license.
So - yesterday did a speed trial with my cNw (#134) Mk2 850 Interstate (cNw belt drive and 22 tooth front) with just under 13,000 miles on it.
For the last 0.5 km saw 133mph (my best estimate) at 7500rpm - what a hoot!
Matt (@cNw ) sure builds a great machine - not one leak or seep on the whole bike. At 80kg I am still sometimes embarrassed, left standing on the "immovable" long RGM kickstarter.
@KiwiShane 's help with jetting & settings on the FCR35's was so valuable too!

I may mature one day - but, at 66 now, I doubt it.
Cheers
 
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robs ss said:
...there's a relatively quiet 3.5 km straight with a short downhill at one end (the Start),
...and I, amazingly, have no demerit points against my license.
So - yesterday did a speed trial with my cNw (#134) Mk2 850 Interstate (cNw belt drive and 22 tooth front) with just under 13,000 miles on it.
For the last 0.5 km saw 133mph (my best estimate) at 7500rpm - what a hoot!
Matt (@cNw ) sure builds a great machine - not one leak or seep on the whole bike. At 80kg, I am still sometimes embarrassed, left standing on the "immovable" long RGM kickstarter.
@KiwiShane 's help with jetting & settings on the FCR35's was so valuable too!

I may mature one day - but, at 66 now, I doubt it.
Cheers
Click to expand...
That’s impressive !
 
I did a very similar speed on my Suzuki GS850 shaftie in 1979 with my girlfriend on the back - but that's not the point - it's still FUN!!
Been WAY faster on my mate's Honda VFR1000 in 1983(?) - 270kph - sooo fast!!
But the Commando still puts the smile on my dial!
 
robs ss said:
...there's a relatively quiet 3.5 km straight with a short downhill at one end (the Start),
...and I, amazingly, have no demerit points against my license.
So - yesterday did a speed trial with my cNw (#134) Mk2 850 Interstate (cNw belt drive and 22 tooth front) with just under 13,000 miles on it.
For the last 0.5 km saw 133mph (my best estimate) at 7500rpm - what a hoot!
Matt (@cNw ) sure builds a great machine - not one leak or seep on the whole bike. At 80kg I am still sometimes embarrassed, left standing on the "immovable" long RGM kickstarter.
@KiwiShane 's help with jetting & settings on the FCR35's was so valuable too!

I may mature one day - but, at 66 now, I doubt it.
Cheers
Click to expand...
Rather you than me pal 😬 cNw #134 is one seriously beautiful bike and clearly more than a show bike in your hands.
 
Was that GPS mph?
I don't have a Dyno Hill so...
 
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robs ss said:
...there's a relatively quiet 3.5 km straight with a short downhill at one end (the Start),
...and I, amazingly, have no demerit points against my license.
So - yesterday did a speed trial with my cNw (#134) Mk2 850 Interstate (cNw belt drive and 22 tooth front) with just under 13,000 miles on it.
For the last 0.5 km saw 133mph (my best estimate) at 7500rpm - what a hoot!
Matt (@cNw ) sure builds a great machine - not one leak or seep on the whole bike. At 80kg I am still sometimes embarrassed, left standing on the "immovable" long RGM kickstarter.
@KiwiShane 's help with jetting & settings on the FCR35's was so valuable too!

I may mature one day - but, at 66 now, I doubt it.
Cheers
Click to expand...
OK, need to know a lot more about what Matt did. 7500 RPM with stock diameter tires, stock gearing except 22T front sprocket is indeed 134 MPH. Doing that without a fairing, with 80kg on board ain't gonna happen with a standard engine even laying on the tank. NOT doubting you - just want to know more!
 
The gearing in the primary with the belt drive is probably a little higher that stock as well. 133 mph would be tough, but doable for somebody in good shape with little or no fear, or worry about blowing up the engine.

Also where are the cable driven tachs and speedos are not reliable indicators comments? ;)
 
robs ss said:
I amazingly, have no demerit points against my license.
Click to expand...


Demerits - fingers crossed for you mate :cool:


robs ss said:
At 80kg I am still sometimes embarrassed, left standing on the "immovable" long RGM kickstarter.

I may mature one day - but, at 66 now, I doubt it.
Click to expand...


God I wish I was still 80 Kgs its been a few decades since I last saw that figure on the scale, nobody mention waist measurements .. Lol !!

Mature my ar*se ... who was it on this Forum who said about Clint Eastwood and keeping the old man out / away ? Keep taking the advice !
 
Schwany said:
How about listing the FCR jetting changes you made?
Click to expand...
Mains now 145 - down from 152
Needle 3rd clip from top
Air jet (adjustable type) 1.75 out
Fuel idle 1.25 out
I have disabled the pumper by putting a shorter rod in (not that it is relevant)

The engine has long rods and light pistons (don't know whose) and gapless rings. I told Matt I didn't want higher compression.
I also asked for the crank to be dynamically balanced.
It has the "boxed" reed valve on the rear of the cases.
Other than that I believe the engine to be stock

Speedo & Tach are Smiths electronic
I have calibrated the speedo with GPS
 
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It is not the speed which is the worry, it is the sudden stop. A 500cc Manx on the IOM can probably get near 140 MPH. Some of the kids here love Phillip Island race circuit. If you get on there with a modern bike, you can go like buggery. It is smooth and flowing and you can ride around the curves flat out. The suspension pumps down and everything feels absolutely lovely. However, you do not need to make a mistake. Any crash there is a really big one. I would not take my Seeley 850 there - to get around the bends at very high speed, I need to keep accelerating fairly hard.
On most race circuits, I have never noticed the speeds. If the bike is quick enough to keep up with the leaders, I am happy. If my bike was much faster than them, I would sell it.
 
robs ss said:
Mains now 145 - down from 152
Needle 3rd clip from top
Air jet (adjustable type) 1.75 out
Fuel idle 1.25 out
I have disabled the pumper by putting a shorter rod in (not that it is relevant)

The engine has long rods and light pistons (don't know whose) and gapless rings. I told Matt I didn't want higher compression.
I also asked for the crank to be dynamical balanced.
It has the "boxed" reed valve on the rear of the cases.
Other than that I believe the engine to be stock

Speedo & Tach are Smiths electronic
I have calibrated the speedo with GPS
Click to expand...
Thanks for posting the jetting. Sounds close to BrianK's tune. It is a little lean for my engine and exhaust. The main in particular. I use the accelerator pump too. Only thing negative about my using the pump is the plugs get a dark ring at the base of the threads riding around at low RPM.

Excellent engine setup. If using gapless rings you probably have Carrillo long rods and Wiseco pistons from JSM. They work really well at high RPM. 👍

I'm famous for being irrelevant. One of my many super powers. ;)
 
Schwany said:
Thanks for posting the jetting. Sounds close to BrianK's tune. It is a little lean for my engine and exhaust. The main in particular. I use the accelerator pump too. Only thing negative about my using the pump is the plugs get a dark ring at the base of the threads riding around at low RPM.

Excellent engine setup. If using gapless rings you probably have Carrillo long rods and Wiseco pistons from JSM. They work really well at high RPM. 👍

I'm famous for being irrelevant. One of my many super powers. ;)
Click to expand...
There is one other negative about the pumper as @Fast Eddie pointed out.
Passing wankers may be prone to twist the throttle on your parked bike - washing the bores. He had taken to putting his helmet over the bar at that end.
👍👍
 
robs ss said:
There is one other negative about the pumper as @Fast Eddie pointed out.
Passing wankers may be prone to twist the throttle on your parked bike - washing the bores. He had taken to putting his helmet over the bar at that end.
👍👍
Click to expand...
One of these would stop all those shenanigans…

www.ebay.co.uk

TWIST GRIP THROTTLE SET WITH LOCK AND KEYS 7/8" HANDLE BARS - BSA TRIUMPH NORTON | eBay

Compatibility: BSA, Norton, Royal Enfield, Triumph, Universal. PRODUCT RANGE: Our high quality range of classic motorcycle spares and accessories covers all great British makes -AJS, BSA, MATCHLESS, NORTON, TRIUMPH, ROYAL ENFIELD, VELOCETTE, VINCENT.
www.ebay.co.uk
 
robs ss said:
There is one other negative about the pumper as @Fast Eddie pointed out.
Passing wankers may be prone to twist the throttle on your parked bike - washing the bores. He had taken to putting his helmet over the bar at that end.
👍👍
Click to expand...
TBH this is a concern I have even if it’s a mate having a quick leg over. The previous owner had fitted a crude ‘cruse control’ on the throttle, I do wonder if it was to lock the throttle when unattended. Matt removed it before shipping but will be in the box of bits with the Corbin King/Queen seat. I may well use an Oxford combination zip lock with my helmet on the throttle.

I don't have a Dyno Hill so...
 
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Café au Lait said:
TBH this is a concern I have even if it’s a mate having a quick leg over. The previous owner had fitted a crude ‘cruse control’ on the throttle, I do wonder if it was to lock the throttle when unattended. Matt removed it before shipping but will be in the box of bits with the Corbin King/Queen seat. I may well use an Oxford combination zip lock with my helmet on the throttle.

I don't have a Dyno Hill so...
Click to expand...
I did post elsewhere that I rigorously tested, under a wide range of conditions, for adverse effects after disabling thinking I might have to change back,
To my surprise I could find no ill effects at all.
Does not appear to have harmed top end either.
I still carry the original "long" rod in my kit bag - just in case. It's a 2-3 minute job to change.
Cheers
 
Café au Lait said:
TBH this is a concern I have even if it’s a mate having a quick leg over. The previous owner had fitted a crude ‘cruse control’ on the throttle, I do wonder if it was to lock the throttle when unattended. Matt removed it before shipping but will be in the box of bits with the Corbin King/Queen seat. I may well use an Oxford combination zip lock with my helmet on the throttle.

I don't have a Dyno Hill so...
Click to expand...
That is a simple, effective throttle lock to reduce rider fatigue when riding more than 15 minutes to the coffee shop. I currently have a (all plastic) similar one fitted on my Commando. Kaoko on my Tiger 1050, Atlas on the Rocket III. I use it every day, for warm-ups at slightly elevated idle, hold throttle so I don't get hit from behind while I zip my jacket, etc.
They used used to make an ALL CHROME VandaCruise for those demanding bedazzled accesories.
All plastic for those not interested in making a fashion statement.

These devices go back 50+ years. Longer if you include set screw friction.

Vista Cruise
VandaCruise
Kaoko
Atlas

Some say crude, I contend clever.

Form
Follows
Function


JMWO
 
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