Paging the handling gurus

If a bike previously noted for its neutral steering (by one N. Champion
Esq.) suddenly developed a slight but noticeable tendency to understeer
in fast sweepers, where would you start the investigation:

(A) Tyres?
(B) Suspension?
(C) Rider?
(D) Quantum Physics?

Said motorcycle might be a little "odd" in the front suspension
department, in case you were wondering...

--
Wicked Uncle Nigel - Manufacturer of the "Champion-105" range of rearsets
and Ducati Race Engineer.

WS* GHPOTHUF#24 APOSTLE#14 DLC#1 COFF#20 BOTAFOT#150 HYPO#0(KoTL) IbW#41
SBS#39 Enfield 500 Curry House Racer "The Basmati Rice Burner",
Honda GL1000K2 (On its hols) Kawasaki ZN1300 Voyager "Oh, Oh, It's so big"
Suzuki TS250 "The Africa Single" Yamaha GTS1000

 

Wicked Uncle Nigel says...

Check the pressures.

 

Tyre pressures, assuming it was acting the same, whether in a left or right
hander.

 

Wicked Uncle Nigel emerged from their own little world to say

My tyres dropped a few psi with the cooler ambient temperature. My funny
front end doesn't like this.

Return of the teddy bear? Increase in BMI?

 

One of the things I've read about Omega-framed bikes, over the years, is
that they're hard on their tyres, and the handling goes off noticeably when
the tyre starts to wear. What does your rear tyre look like,
condition-wise?

 

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

OK, two from two had me just out in the garage checking again.

They're both spot-on (36/42) where they were when the RacerGod made him
"neutral handling" comment.

So it ain't that.

--
Wicked Uncle Nigel - Manufacturer of the "Champion-105" range of rearsets
and Ducati Race Engineer.

WS* GHPOTHUF#24 APOSTLE#14 DLC#1 COFF#20 BOTAFOT#150 HYPO#0(KoTL) IbW#41
SBS#39 Enfield 500 Curry House Racer "The Basmati Rice Burner",
Honda GL1000K2 (On its hols) Kawasaki ZN1300 Voyager "Oh, Oh, It's so big"
Suzuki TS250 "The Africa Single" Yamaha GTS1000

 

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

See up ^^^ there, I've just checked them and they're spot on.

Teddy seems firmly in his box at the moment, and I don't *think* I've
got noticeably lardier in the last few day. I can still get my trousers
done up, anyway.

--
Wicked Uncle Nigel - Manufacturer of the "Champion-105" range of rearsets
and Ducati Race Engineer.

WS* GHPOTHUF#24 APOSTLE#14 DLC#1 COFF#20 BOTAFOT#150 HYPO#0(KoTL) IbW#41
SBS#39 Enfield 500 Curry House Racer "The Basmati Rice Burner",
Honda GL1000K2 (On its hols) Kawasaki ZN1300 Voyager "Oh, Oh, It's so big"
Suzuki TS250 "The Africa Single" Yamaha GTS1000

 

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

Worn, but not excessively so. Not noticeably squared-off. I'd say it's
about half-way to done in.

I was about to chest-beat about its lack of chicken strips when I
remembered it's been whored-out as a CIHAGM steed, so it probably wasn't
me...

--
Wicked Uncle Nigel - Manufacturer of the "Champion-105" range of rearsets
and Ducati Race Engineer.

WS* GHPOTHUF#24 APOSTLE#14 DLC#1 COFF#20 BOTAFOT#150 HYPO#0(KoTL) IbW#41
SBS#39 Enfield 500 Curry House Racer "The Basmati Rice Burner",
Honda GL1000K2 (On its hols) Kawasaki ZN1300 Voyager "Oh, Oh, It's so big"
Suzuki TS250 "The Africa Single" Yamaha GTS1000

 

Rider position can influence understeer if the rider rotates around the tank
instead of leaning straight off.

Quantum physics effects everything, so that must be the answer... I blame it
on the quarks.

 

First thing I'd look at. If the front tyre is a bit flattish in profile
it tends to understeer. I take it you're talking about the GTS? In which
case, given the unknown (by me) characteristics of that suspension, your
guess is as good as mine.

 

Is the front wearing evenly on both sides? Maybe the camber adjustment.
Try 38 in the front, see what happens.

 

Rear suspension, causing the back end to sag, thereby increasing the
trail, and making it slower-steering.

 

In

or according to Heisenberg "yes" depending on how you look at it!

 

I've got the RSPCA on the phone for you: they say they've had complaints
about cats being subjected to excessive levels of uncertainty.

 

Are they calling from a phone box?

 

Maybe. Or maybe not.

 

The Older Gentleman wrote

I like that one. I shall remember it for future use.

 

Darn, regretting not turning up before 9pm now ...

Still at least the SOC car I was MIG welding [1](which made me late)
got through the MOT

P.

[1] Mr blobby welds [2] :/
[2] Welding to rust is never very pretty/productive !

 

Level 3 is welding to fresh air. More practice needed.

 

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

Seems to be. In fact, more evenly than most bikes I've owned.

36 *was* working fine. I think it's tyre wear.

--
Wicked Uncle Nigel - Manufacturer of the "Champion-105" range of rearsets
and Ducati Race Engineer.

WS* GHPOTHUF#24 APOSTLE#14 DLC#1 COFF#20 BOTAFOT#150 HYPO#0(KoTL) IbW#41
SBS#39 Enfield 500 Curry House Racer "The Basmati Rice Burner",
Honda GL1000K2 (On its hols) Kawasaki ZN1300 Voyager "Oh, Oh, It's so big"
Suzuki TS250 "The Africa Single" Yamaha GTS1000