why does my rear wheel keep locking? - Page 4 - SV650.org

ophic · 17-08-04, 04:03 PM

aftermarket can will also reduce exhaust restrictions and therefore engine braking

17-08-04, 04:45 PM

Hmm, I would have thought the opposite.

.

17-08-04, 05:57 PM

If you think about accellerating thru the gears, the revs rise then when you change up, the revs fall due to the different size of gears then you accellerate again etc.
So apply the opposite when you are coming down thru the gear box, for every change down the revs must rise to match road speed/engine speed because of the different ratio of the gears, so to give the engine a blip, especially with v twins with the more excessive engine braking, helps match the revs to engine speed/road speed.
two strokes have no engine braking so you use the brakes more as there is no engine braking effect.

Hope this helps

ride safe.
Sean.

northwind · 17-08-04, 08:46 PM

Aftermarket can doesn't make that much difference, I was sliding the rear all over tonight... Blipping's as easy as clutchless changes- it's the same idea- and it's not likely to make you crash practicing... Most of the skids you get from engine braking sort themselves out pretty quickly.

Oh aye, engine braking won't make you lock the rear unless you stall entirely, all it'll do is drag the rear, causing a slide. It shouldn't lock completely, which is why it's so much more controllable than a rear brake lock.

17-08-04, 09:03 PM

Quote:

Originally Posted by keithd

i was traveling at about 55mph , changed down to 3rd or 2nd, (can't remember) the revs didnt go any higher than 8,000 (i dont think) but the wheel locked up momentraily.

I wouldn't bother with down changes at that speed or anywheree near those RPM. Ride the mid-range and practise good throttle control.

Chain tension is essential for smooth gear changes.

A throttle 'blip' before changing down should be quite small, somewhere along the lines of 500rpm matching engine and road speed for the appropriate gear.
Downchanging should be smooth and allow the engine braking time to settle the bike before going down another gear.
Don't load the engine, by downchanging, too much for slowing the bike, that's what brakes/closed throttle are for.

18-08-04, 04:36 AM

Blipping on 2 strokes? Hah! They don't have any engine braking, that's why the guys in GP just bang down through the gears when approaching corners and why slipper clutches are the standard in Moto GP.

The bit where you need to really practice is blipping the throttle while braking and downchanging. It takes a bit of practice to keep it smooth but feels really good when it is right.

Just reiterating that the purpose of the brakes is to slow/stop the bike (decelerator if you will) and the engine/throttle to accelerate.

Just downchange at the right time to keep the engine smack bang in the midrange so you can access all that lovely torque and rev it through on exiting the corner etc.

18-08-04, 08:16 AM

Quote:

Originally Posted by PeterM

Blipping on 2 strokes? Hah! They don't have any engine braking, that's why the guys in GP just bang down through the gears when approaching corners and why slipper clutches are the standard in Moto GP.

The bit where you need to really practice is blipping the throttle while braking and downchanging. It takes a bit of practice to keep it smooth but feels really good when it is right.

Just reiterating that the purpose of the brakes is to slow/stop the bike (decelerator if you will) and the engine/throttle to accelerate.

Just downchange at the right time to keep the engine smack bang in the midrange so you can access all that lovely torque and rev it through on exiting the corner etc.

cheers peter, and cheers to everybody else who's answered.

i think i just need to ride more, keep practising, get used to blipping, don't change down with too high revs...

oh and tighten my chain a tad!

when i passed my test my instructor said to me "now you can go out and learn how to ride. you never stop learning"

very true it would appear!

18-08-04, 08:33 AM

Cans have no effect on engine braking

18-08-04, 11:02 AM

Blipping will become a habit after a while.

I didn't know what it was called until now, nor did I know the reason for it but now I find that I have to concentrate on NOT blippin when changing down, it feels wrong not too.

Sometimes when travelling through a built up areas whilst trying to keep the noise from the can to a minimum I have to remind myself to try not to blip when changing down.

It has become a natural part of riding, expecially on a twin where I find the gear changes rather clunky.

18-08-04, 07:13 PM

Hello to all, I just came back from vacation, having made more than 1200 miles on the SV. Chicken strip on fron tyre reduced to 1cm in the process

I wonder why for so many people is this "moving" of the bike is so disconcerting when downshifting. Look at Supermotard: What the guys in supermotard do is downshift, release the clutch, and the back end goes out all the way to the apex. You can see also some MotoGP riders do it (to a less extent), most notably Rossi. It is a mistake to say that the rear wheel "locks" during the downshift as it does not, it is simply spinning with a speed less that the actual speed of the bike. This kind of sliding is almost impossible to take you out of control, unless you panick.
When I had a trailie bike I was trying to mimic what the supermoto guys are doing and found out that getting the back out durin turn-in by downshifting can be great fun and can give much satisfaction.
Admittedly, it cannot be done as well with a street bike but It is still enjoyable nonetheless....

17-08-04, 04:03 PM	#31
ophic Member Mega Poster Join Date: Jan 2004 Location: Whyteleafe Posts: 3,395	aftermarket can will also reduce exhaust restrictions and therefore engine braking __________________ Silver SV650SK3, Fuel exhaust

17-08-04, 08:46 PM	#34
northwind Moderator Mega Poster Join Date: Jan 2004 Location: In the garage where I belong Posts: 17,083	Aftermarket can doesn't make that much difference, I was sliding the rear all over tonight... Blipping's as easy as clutchless changes- it's the same idea- and it's not likely to make you crash practicing... Most of the skids you get from engine braking sort themselves out pretty quickly. Oh aye, engine braking won't make you lock the rear unless you stall entirely, all it'll do is drag the rear, causing a slide. It shouldn't lock completely, which is why it's so much more controllable than a rear brake lock. __________________ "We are the angry mob, we read the papers every day We like what we like, we hate what we hate But we're oh so easily swayed"

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17-08-04, 04:45 PM	#32
jonboy Guest Posts: n/a	Hmm, I would have thought the opposite. .

17-08-04, 05:57 PM	#33
Logie bear Guest Posts: n/a	If you think about accellerating thru the gears, the revs rise then when you change up, the revs fall due to the different size of gears then you accellerate again etc. So apply the opposite when you are coming down thru the gear box, for every change down the revs must rise to match road speed/engine speed because of the different ratio of the gears, so to give the engine a blip, especially with v twins with the more excessive engine braking, helps match the revs to engine speed/road speed. two strokes have no engine braking so you use the brakes more as there is no engine braking effect. Hope this helps ride safe. Sean.

18-08-04, 04:36 AM	#36
PeterM Guest Posts: n/a	Blipping on 2 strokes? Hah! They don't have any engine braking, that's why the guys in GP just bang down through the gears when approaching corners and why slipper clutches are the standard in Moto GP. The bit where you need to really practice is blipping the throttle while braking and downchanging. It takes a bit of practice to keep it smooth but feels really good when it is right. Just reiterating that the purpose of the brakes is to slow/stop the bike (decelerator if you will) and the engine/throttle to accelerate. Just downchange at the right time to keep the engine smack bang in the midrange so you can access all that lovely torque and rev it through on exiting the corner etc.

18-08-04, 08:33 AM	#38
zx6man Guest Posts: n/a	Cans have no effect on engine braking

18-08-04, 11:02 AM	#39
Ibanez7779 Guest Posts: n/a	Blipping will become a habit after a while. I didn't know what it was called until now, nor did I know the reason for it but now I find that I have to concentrate on NOT blippin when changing down, it feels wrong not too. Sometimes when travelling through a built up areas whilst trying to keep the noise from the can to a minimum I have to remind myself to try not to blip when changing down. It has become a natural part of riding, expecially on a twin where I find the gear changes rather clunky.

18-08-04, 07:13 PM	#40
Damoulianos Marios Guest Posts: n/a	Hello to all, I just came back from vacation, having made more than 1200 miles on the SV. Chicken strip on fron tyre reduced to 1cm in the process I wonder why for so many people is this "moving" of the bike is so disconcerting when downshifting. Look at Supermotard: What the guys in supermotard do is downshift, release the clutch, and the back end goes out all the way to the apex. You can see also some MotoGP riders do it (to a less extent), most notably Rossi. It is a mistake to say that the rear wheel "locks" during the downshift as it does not, it is simply spinning with a speed less that the actual speed of the bike. This kind of sliding is almost impossible to take you out of control, unless you panick. When I had a trailie bike I was trying to mimic what the supermoto guys are doing and found out that getting the back out durin turn-in by downshifting can be great fun and can give much satisfaction. Admittedly, it cannot be done as well with a street bike but It is still enjoyable nonetheless....