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John Stevenson30/10/2015 10:19:39
5068 forum posts
3 photos

This post /forum for all general motorcycle related topics as requested.

Don't have time now but I'll add my input to it tonight.

Nick_G30/10/2015 10:40:33
1808 forum posts
744 photos


OK I will add to this thread with a question.

I understand how centrifugal force works. But I am informed that when a motorbike is cornering it is centripetal force that keeps the machine and rider (hopefully wink. ) shiney side up.!

I have tried google to understand this but TBH it goes over my head. Can anybody explain to me in dunce type language how centripetal force works.?

Cheers, Nick

KWIL30/10/2015 11:00:38
3549 forum posts
70 photos

Centrifugal force is the force acting outwards due to circular motion (of bike or any other object). Centripetal force is the tension in the string preventing the stone (or other object) from flying outwards away from centre of rotation.

In the case of the M/C, having the weight of the rider and bike inwards and downwards from the point of contact with the road applies a rotational force opposite to the centrifugal force. Small riders lean further in!

Hopper30/10/2015 11:02:13
6197 forum posts
321 photos

And when you have done that, explain to us which is better: synthetic oil or dino.laugh

As I understand it, if you swing a ball around on the end of a string, centrifugal force tries to hurl the ball outwards. Centripital force is the string that stops it from going outwards. Which I guess would be the traction of the motorcycle tires. But there is no end (literally) of variations on the theme.

Great idea for a thread by the way. I had thought of raising the possibility before when looking at the aircraft discussion thread. Here is a pic of my latest project (long term, little progress of late times), a Harley WLA engine in a Norton Featherbed frame. Upsets the purists on both sides. devil

HasBean30/10/2015 11:23:01
141 forum posts
32 photos

I was always taught that centrifugal force doesn't actually exist, only centripetal force which is preventing the body from moving in a straight line which it is want to do.




Oh, and to try to keep on thread 


(not everyone's cup of tea though I guess...)


Edited By HasBean on 30/10/2015 11:33:34

Nick_G30/10/2015 11:45:35
1808 forum posts
744 photos
Posted by HasBean on 30/10/2015 11:23:01:

Oh, and to try to keep on thread


And I will do the same. smiley

I am thinking of getting a bigger bike though. Not because I want to go faster. (Even a Hornet is far quicker and capable than I will ever be.) It's just that bigger bikes are more 'planted' on the road and are easier to ride. Especially if you have some totty on the back.

Taken in Howth, Just south of Dublin.


michael cole30/10/2015 11:46:43
165 forum posts

Counter steering, feels weird but it works. ie turn the bars one way and the bike goes the other .


only got a BMW R100t now.

JA30/10/2015 11:53:07
1345 forum posts
80 photos
Posted by HasBean on 30/10/2015 11:23:01:

I was always taught that centrifugal force doesn't actually exist, only centripetal force which is preventing the body from moving in a straight line which it is want to do.




Yes, I was taught that at school along with "every force has an equal and opposite reacting force".

Both exist.

Got four bikes taxed and a failed hip. Very unhappy.


Edited By JA on 30/10/2015 11:55:20

Gordon W30/10/2015 11:58:39
2011 forum posts

Have had loads of bikes, but now age and wife stopped it all. Ps never liked anyone on the back, not moving anyway.

GarryC30/10/2015 13:25:58
740 forum posts
1043 photos

Heck you're going to need a bigger server if we can upload bike pics now as well smile


Involute Curve30/10/2015 13:31:06
337 forum posts
107 photos

We should have had a thread for this ages ago, real busy at the moment but will try to contribute something relavant later.


Nick_G30/10/2015 13:56:24
1808 forum posts
744 photos


And for all you affectionados of British bikes here is some video of my friends restored Norton.


Cornish Jack30/10/2015 14:04:39
1219 forum posts
171 photos

But what about this?? - I thought Honda had one already!!



Edited By Cornish Jack on 30/10/2015 14:05:15

Nick_G30/10/2015 14:08:19
1808 forum posts
744 photos
Posted by Cornish Jack on 30/10/2015 14:04:39:

But what about this?? **LINK** I thought Honda had one already!!



Edited By Cornish Jack on 30/10/2015 14:05:15


Well I hope it's better than Hondas latest F1 engine offering. wink



Edited By Nick_G on 30/10/2015 14:09:12

colin hawes30/10/2015 14:28:13
557 forum posts
18 photos

I've got a 250 ohv twin BSA Sunbeam scooter (in pieces) which I intend to restore in the future. One problem is likely to be sourcing a new white/grey rubber floor mat. Colin

Neil Wyatt30/10/2015 15:26:17
18990 forum posts
734 photos
80 articles

+1 to what Paul says - if a bike unsticks, it goes forwards in a straight line, it doesn't fly outwards.


OuBallie30/10/2015 16:25:25
1164 forum posts
662 photos

Love that Norton, and the difference between old and new cars/bikes overloaded with computers.

Mention of RC motorcycles, I sold an RC model, of a Honda I think it was, in my shop in the '80s.

Everyone was sceptical, including myself, until that is I built one and tested it.

It worked a treat, with the 'steering' servo tilting the whole body of the bike aft of the front forks.

Here's my contribution, not mine I hasten to add, but it reminded me of my CB350 Twin I bought in 1972.

2015 and still in Ex-factory condition:

Honda 175

License disc says it all:

Honda 175

Even more so the odometer!:

Honda 174

Can confirm what Mike said about counter steering, it's the quickest way to put a 'bike down or get into a corner fast.

It went against the grain until tried, but too much and you are down.

Geoff - 4 wheels for me now, though I miss the feeling of freedom!

Bezzer30/10/2015 17:06:36
156 forum posts
13 photos

Bloody typical, a bike thread is started just as I have had to call it day after 40 odd years of biking crying, knees and back have forced it on me. Can't even face carrying on with my Kettle project and not being able to use it so that's just gone as well. At least I can keep in touch making bits for others as I've done for a few years and seriously consider the unthinkable of getting a scooter for knocking about on, I HATE cars with a passion, won't use the wife's unless I really have to.

jim'30/10/2015 17:13:41
72 forum posts
6 photos


Roger Williams 230/10/2015 17:29:41
346 forum posts
3 photos

Did anyone see the Rossi - Marquez saga from Sepang on Sunday !!. I reckon Marquez was asking for it.....

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