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#Post#: 1460--------------------------------------------------
Re: Preparing for a Long Trip
DIR By: banquo
Date: July 4, 2016, 5:50 am
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Yes, average speeds are often very surprising.
Like most modern cars, mine has a trip computer, and I'm always
amazed at how low the average speed is between filling the tank.
Even if you're doing 120 kph, stops have a very dramatic effect
on the average.
I remember reading an excercpt from Nick Sanders on how he
managed to do such long distances; the answer was that he didn't
ride fast; he just stopped for the bare minimum of time.
My comfortable speed on the Militare with the stock gearing is
only 80 kph though.
That's the speed it seems happiest.
#Post#: 1466--------------------------------------------------
Re: Preparing for a Long Trip
DIR By: krisztian_andre
Date: July 5, 2016, 11:46 am
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Some guy had to go up near my place and transported my bike in
his van for the price of fuel both ways so I'm happy with that.
6l/100km seems a lot at 100km/h I'll post my experience when I
get the papers for the bike.
I'm going to set the carburettor then. The book sais set the
idle to 1000rpm, then adjust the air-screw to max rpm. This
seems too lean to me...
#Post#: 1543--------------------------------------------------
Re: Preparing for a Long Trip
DIR By: cloggy
Date: September 3, 2016, 12:56 pm
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That's what you do on any old bike. Set the idle to optimum
chuffing revs with the throttle adjuster, normally found on the
carb. Then fiddle with the pilot air screw.If too lean or too
rich the revs drop. If the revs go up you just reset the idle
screw to lower the revs and then fiddle with the pilot mixture
screw again. Simples, as long as you have the correct pilot jet.
I set them up so it doesn't spit back or hesitate if I quickly
open the throttle.
I have an old Classic Bike article in which two Germans, or
were they Dutch, I can't remember? Pro mechanics anyway rebuilt
a pair of singles and toured to the TT. The article stated that
they cruised at 70mph. Quite fanciful I thought as the bike
feels happier at 55 than 60 and has less acceleration than my
old 18 had. It is also comparatively gutless at low revs,
possibly due to massive weight and a short stroke motor, but
then my other main roadbike is an M21 ....
Subsequently I popped down to St Davids and then came back in
part on dual carriageway. I was wandering along and wondered
what the top speed was only to realise I'd been travelling at 70
for at least an hour. It was smooth at that speed. Now I know
that it's economical cruising speed is lower but this is a
motor that can relatively easily be made to produce a lot more
power at higher revs without resorting to beefing up the bottom
end or gearbox. Standard at 70 it's piston speed is will be low
as it is very high geared. I very much doubt one would do any
harm to the motor but it's going to use fuel at a higher rate so
you may not get there any faster. All I noticed was oil mist
from the pitifully flimsy oil feed line to the head: and for
the last 30 miles cramp in my left leg...I did something like
500k that day.
#Post#: 1552--------------------------------------------------
Re: Preparing for a Long Trip
DIR By: huub
Date: September 6, 2016, 6:31 am
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i average 5 l/100 km on my NF.
mine has a longer gearing , that helps a bit, it also has the
legshields and the stock fairing ,
so its about as aerodynamic as my shed.
800 km/day is no problem, done that regularly.
overheating might be a problem if you run it at "high" revs for
a couple of hours ,
i experienced a dropped exhaust valve twice, both times after
spending a couple of hours on the highway.
#Post#: 1563--------------------------------------------------
Re: Preparing for a Long Trip
DIR By: cloggy
Date: September 7, 2016, 3:27 am
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My manual has the words air screw and throttle adjuster
transposed. The info is correct as long as you disregard the
terms. Throttle adjuster is the higher adjuster screw on the
carb.
What happens when a valve drops? I'd expect it to lunch the
piston and rod, but then the engine is so overbuilt and low
compression there may be room for it to rattle on top of the
piston. There are better valves available.
#Post#: 1564--------------------------------------------------
Re: Preparing for a Long Trip
DIR By: huub
Date: September 7, 2016, 4:08 am
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this is the result of a dropped valve, basically the top of the
piston gets smashed.
after this the rod and bigend bearing were fine,
the head was damaged but repairable.
[IMG]
HTML http://i1375.photobucket.com/albums/ag459/huubc1/foto0036_zps16ff474f.jpg[/img]
i've had it happen twice, first time with all the original parts
, the second time with upgraded valves ( 8mm stem ) and springs.
next time i'll try a pair of kibblewhite valves, if i can find
somebody in europe who sells kibblewhite blanks.
i am not sure what causes the valve to snap ,
probably be the valves expands so much it runs out of tappet
clearance ,
the valve hardly touches the seat and overheats.
really hot NF engines tend to have pretty little compression.
#Post#: 1565--------------------------------------------------
Re: Preparing for a Long Trip
DIR By: banquo
Date: September 7, 2016, 6:57 am
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Catastrophic failure I'm afraid; from previous posts on here,
valve goes through piston.
Whoops - huub beat me to it.... :-[
#Post#: 1566--------------------------------------------------
Re: Preparing for a Long Trip
DIR By: cloggy
Date: September 7, 2016, 10:13 am
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Haven't run out of compression, only way that can happen is if
the tappets set too tight. [short of seizing] The narrow stem
valves must come in two parts too, and then spun together: never
the less, think I'll stick to 60ish in future...
#Post#: 1567--------------------------------------------------
Re: Preparing for a Long Trip
DIR By: nick949
Date: September 7, 2016, 11:09 am
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mine stays relatively cool even on extended trips at 100 kph. No
overheating issues at all.
#Post#: 1569--------------------------------------------------
Re: Preparing for a Long Trip
DIR By: cloggy
Date: September 7, 2016, 12:17 pm
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Yes mine runs cool too. Takes ages to warm up. I'm running
Morris Vtwin oil.
One kick and the oil presure light goes out. I'll use upper
cylinder lead replacement lube in future just to be sure{r}. It
failed MOT due to a lighting short so that's being sorted this
week, maybe...
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