Who own a 10R and a tank cam?

A dumb question but I haven't got one of these new-fangled twentyfirst
century bikes. I presume the speedo is driven from the gearbox as it
didn't slow down during those long wheelies. So can it be adjusted
if you change sprocket sizes?

 

That dear old chap, Champ tugged on his pipefull of old shag and said:

To be fair, speedo drives that read off the front wheel can also be
affected by different tyre profiles - although I suspect that the
rolling circumference of different makes of front tyre vary by a
smaller amount than back tyres.

 

<Points at Yellow Box & flicks VVVs>

--
Krusty
www.MuddyStuff.co.uk
Off-Road Classifieds

'02 MV Senna '03 Tiger 955i '96 Tiger '79 Fantic Hiro 250

 

Champ says...

On Saturday Danny's 10R with modified gearing was showing 182mph on the
speedo over the start line at Brands. I think the change in gearing
might have affected the speedo just a little bit. I told him to just
whip the speedo sensor out and cable tie it out of the way so the speedo
doesn't read at all. We'll try that at Donington on Friday to see if it
affects the engine performance in any way, because we know that some
ignition systems use the speedo sensor to be fitted as well.

 

Would you like to try that again, in English? I know it isn't your
first language, but some standards should be maintained, old chap.

 

Pip says...

Replace the word "use" with "require" and try again.

 

That was a nice straight bat

 

Champ says...

It's purely for my benefit as his spanner monkey. Removing the sensor
makes for one less bolt to undo and one less cable to faff around with
when I'm swopping front sprockets. Cable tieing the sensor away from the
cover permanently makes the job a bloody sight easier cos the sensor
does get in the way when I'm working in there and makes getting the
cover off a pain as the cabling is awkward to hook out of the way every
time.

 

http://www.speedohealer.com/eng/intro.htm

HTH
--

+-------------------------------------------------------------+
| Pete Fisher at Home: |
| Voxan Roadster Gilera Nordwest Yamaha WR250Z |
| Gilera GFR Moto Morini 2C/375 |
+-------------------------------------------------------------+

 

D'oh. I bet the 10R is cable driven isn't it?

 

says...

No, it's electronic. There's a sensor on the sprocket cover.

 

Ah, I should have read your post up there ^^^^ properly.

If all else fails, a permanent re-gearing on a cable driven speedo bike
could probably be corrected by the nice people at redial UK who did the
Tart KPH to MPH/KPH speedo conversion for me. I reckon if given an exact
percentage figure they could create a custom dial.

--

+-------------------------------------------------------------+
| Pete Fisher at Home: |
| Voxan Roadster Gilera Nordwest Yamaha WR250Z |
| Gilera GFR Moto Morini 2C/375 |
+-------------------------------------------------------------+

 

Nope. I've been toying with the idea of fitting a 16T front sprocket
on mine and had already had a look at speedo healers for fitting at
the same time.

What I need to do is work out how much I can alter the gearing by so I
can rev it through to the limiter in top and be right on the 186mph
point where allegedly the speed limiter kicks in. There's no point in
having revs being wasted at the top end when I can **** with the
gearing and make the bike faster off the line.

 

Doing hill climbs at venues with 64 foot timing lights is very
informative with regards to the 'launch'. 2 seconds is the target to
aspire to. I have even managed it a couple of times. Once on the
Husqvarna and once on the Nordwest. Not managed it on the Tart yet but
have got within a tenth.

Paul Jarrett on his R1 and Keith Cooper on the 1200 Suzuki find it
harder.

 

Using the patented Mavis Beacon "Hunt&Peck" Technique, Champ

<nods>

--
Wicked Uncle Nigel - Podium Placed Ducati Race Engineer as featured in
Performance Bikes and Fast Bikes

WS* GHPOTHUF#24 APOSTLE#14 DLC#1 COFF#20 BOTAFOT#150 HYPO#0(KoTL) IbW#41
SBS#39 OMF#6 Enfield 500 Curry House Racer "The Basmati Rice Burner",
Honda GL1000K2 (Falling apart) Kawasaki ZN1300 Voyager "Oh, Oh, It's so big"
Suzuki TS250 "The Africa Single" Yamaha Vmax Honda ST1100 wiv trailer

 

I can't quite figure out which bit you're agreeing too?

<snigger>

 

Or you may just have got older and greyer

 

It's supposed to be 'The older you get the faster you were.'

 

Perhaps I phrased that wrongly. I should have said the ability to do
stupid things in 2nd and 3rd gears without having to use the clutch.

 

64 feet in 2 seconds = 32 ft/s/s acceleration = 1G. All about finding
just the right amount of grip and not skying it. No 'reaction time'
involved, you break a start beam as in sprinting. Once the light goes
green you start when ready. The timekeepers don't like you fannying
around for too long before going for it though.

Some of the MX based machines have 'launch control' gadgets that keep
the forks compressed off the line. The rider lunges down on the forks
and hooks up catches that keep them compressed. Once they hit the
brakes for the first bend the forks compress even further and the
catches release.

It is reckoned that there is half a second to be gained or lost off
the line. At big meetings the top ten qualifiers can all be within
that margin of each other even over a long hill (Loton = 60 seconds
for riding gods).