will switching off the engine when bike is hot cause damage?

[DeusExMachina]

Unnecessary. Waste of your battery.

 

The fan's function is to cool the coolant circulating through the radiator. If your engine is off, the coolant pump is not working, hence no coolant is circulating.

 

What is it cooling then?

[antartica]

Unnecessary. Waste of your battery.

 

The fan's function is to cool the coolant circulating through the radiator. If your engine is off, the coolant pump is not working, hence no coolant is circulating.

 

What is it cooling then?

 

noted... hadn't thought of it that way

next time i'll just shut down and leave, and not stand there like a ku-ku... LOL

[mild_slevin]

To add. Temps for a big bike are likely to be about the same after you've run it hard, or if you've let it idle around for 2 minutes. If you look at bikes like the R1, for eg.... it runs so hot that less than 30 secs after stopping at the traffic lights, it goes over 100C and the fan kicks in. When running it at high RPMs, temps are likely to stay in the 90s, due to air running thru the radiator cooling the circulating coolant.

 

So suppose you let the bike idle for a couple of minutes after you've reached your destination and let the temps build to a boil then turn it off.... what the hell is the difference from turning it off immediately after a hard ride???

 

Yes, agreed... it happened on my 919 too... idling would "cooked" the bike... I read up articles it matches wat Deus mentioned... poor air flow into the radiator... despite the fan still running... if I let the baby idle for 2 mins surely "fever" (upon touch down)

[DeusExMachina]

There is only one type of "cooling down" after a hard ride.

 

Say, you've been doing 299 on the NSH. So about perhaps 5km from the rest point, you might wanna slow down to 90kph and cruise the remainder of the distance to the stop point. This will lower the engine temps to normal.

 

But you'd still be advised to turn the engine off immediately when you reach the stop.

[prettymussel]

Yeah. This makes more sense.

 

Don't cover the bike after a ride. Let it cool in the open first.

 

I do that when I'm out.

But when going home at night, I just don't care. I cover it immediately and go home.

 

After all, I don't pay season parking.

And I'm too lazy to come back down after a half hour to find a fuccking parking ticket.

 

as far as possible i try to let it cool in the open..

 

but just as u said, at the end of a day, usually i will just cover immediately n go home cos a bit lazy to come back down again later!

[prettymussel]

to add on to the thread rather than start a new one

 

does any one turn off the ignition if you hear your fan running as you park?

 

for me, if i hear my fan running, i'd let it stop before turning everything off...

 

is that right or unecessary?

 

p/s riding spec III

 

ok i know i will sound rather dumb after saying this, but i didnt know specIII had a fan!

[ghost04]

i'll cut the engine but let the fan run for awhile if i reach my destination wit the fan on...

>104 deg...

[antartica]

ok i know i will sound rather dumb after saying this, but i didnt know specIII had a fan!

 

LOL

neither did i until i started riding one and heard it running... haha

[mild_slevin]

Hmmm I have a doubt in switching OFF the engine via the red engine kill button OR turn the keys to OFF... any difference? Its seems that the red button cuts off the electric supply to the spark plugs... as well as radiator fan...

[DeusExMachina]

Hmmm I have a doubt in switching OFF the engine via the red engine kill button OR turn the keys to OFF... any difference? Its seems that the red button cuts off the electric supply to the spark plugs... as well as radiator fan...

 

The red kill switch just cuts off power to the coil, preventing engine ignition. The electricals and fan are still active, at least for my bike.

 

I usually just turn the key, unless I still need the headlights for some reason.

[ben1112]

Tick tick sound is rapid cooling of metal parts, resulting in contraction. Is perfectly normal. May come from disc brake or exhaust.

[samuelftw5]

The red kill switch just cuts off power to the coil, preventing engine ignition. The electricals and fan are still active, at least for my bike.

 

I usually just turn the key, unless I still need the headlights for some reason.

 

any ideas whether switching off the kill switch before stationary will have side effect? Or either ways is the same? ty bro

[lunloon]

any ideas whether switching off the kill switch before stationary will have side effect? Or either ways is the same? ty bro

 

If u need an additional push before stop, you probably have to push with ur legs.

[DeusExMachina]

any ideas whether switching off the kill switch before stationary will have side effect? Or either ways is the same? ty bro

 

No effect. Why should it.

 

Looking at it logically, unless you're at high speed, turning off the engine won't hurt it or the bike. Just clutch in and coast to a stop.

[mepkoh]

the only thing that i know is that ..yeah you can switch it off...but do not turn it on again immediately after switching off..

the moving parts can bind...

ther are all sort of machineries that advises u that after turning it off ..do not attempt to turn it on immediately..wait for 5 minutes..

 

as to one bro mentioning the kill switch kills the coil..erhmm

the kill switch does not kill the coil..it direct the high tension voltage to earth rathert han to you spark plugs..thus killing the engine .

[samuelftw5]

Oh, thanks! Cause what i normally do is when it is about to stop, i will kick N and press the kill switch and let it roll till my slot.

 

So wondering any side effect. Thanks for the clarification!

[Orleng]

just my 0.02, using the kill-switch all the time can lead to loose contacts. might not be too amusing if your engine died on you on the expressway.

 

happened during my 2A training at SSDC. once in awhile at e-brake area, itchy finger, use kill switch so don't have to kick to neutral or hold the clutch while waiting for turn to move, esp when alota ppl.

 

one time, the bike refused to start back up after flipping the switch back to on pos. push all the way back to the training shed. one of the instructors came out to see the prob, and tried to start it by push-starting etc, but cannot. then another more familiar face (over here on sbf) came, took a go, and figured out it was loose contact at the engine kill switch. when he press down on it damned hard, the switch can make contact, and can start, but once let go, it will die again. so he advised me, next time when get own bike, try not to use the engine-kill, wear n tear might leave you with loose contacts and stranded on the highway!

 

he prolly also figured out i was being lazy and using the kill switch instead of holding the clutch in, but didn't scold me. just advised me not to use the kill-swtich when i got my own bike. ups for a kind n friendly instructor! he's on the forum by the by.

[samuelftw5]

just my 0.02, using the kill-switch all the time can lead to loose contacts. might not be too amusing if your engine died on you on the expressway.

 

happened during my 2A training at SSDC. once in awhile at e-brake area, itchy finger, use kill switch so don't have to kick to neutral or hold the clutch while waiting for turn to move, esp when alota ppl.

 

one time, the bike refused to start back up after flipping the switch back to on pos. push all the way back to the training shed. one of the instructors came out to see the prob, and tried to start it by push-starting etc, but cannot. then another more familiar face (over here on sbf) came, took a go, and figured out it was loose contact at the engine kill switch. when he press down on it damned hard, the switch can make contact, and can start, but once let go, it will die again. so he advised me, next time when get own bike, try not to use the engine-kill, wear n tear might leave you with loose contacts and stranded on the highway!

 

he prolly also figured out i was being lazy and using the kill switch instead of holding the clutch in, but didn't scold me. just advised me not to use the kill-swtich when i got my own bike. ups for a kind n friendly instructor! he's on the forum by the by.

 

:thumb:

[DeusExMachina]

Moving parts bind? How and why?

[antartica]

Moving parts bind? How and why?

 

loose switch? contacts?

 

but then again with the usage levels of school bikes vs personal machine... those are like prostitute vs life partners...

 

one anyone who pays can ride (limited time only)... the other one you never stop paying (for life !! !!! !!!!)............. haha

[Orleng]

loose switch? contacts?

 

but then again with the usage levels of school bikes vs personal machine... those are like prostitute vs life partners...

 

one anyone who pays can ride (limited time only)... the other one you never stop paying (for life !! !!! !!!!)............. haha

 

very true, about the usage.

 

then again, why tempt fate? sch bike loose kill-switch contacts, screw it, just change bikes.

 

personal bike, inconvenience (if urgently heading somewhere, wife about to give birth, late in sending migrating friend off) towing + repair fees.

 

ymmv.

[taaouicha]

Tick tick sound is rapid cooling of metal parts, resulting in contraction. Is perfectly normal. May come from disc brake or exhaust.

 

agree with this post, for my bikes its usually from the exhaust

doubt engine would make a tick tick sound

[ben1112]

after a long day of riding, i'd like to splash my bike with water and see it sizzle. Especially during heavy rain

 

Later ur metal parts crack then u heh heh.... Rapid cooling causes stress. Imagine the metal part very hot and expanded, then u pour cool water on it and the surface contracts much quickly then the other side. It can cause cracks to form and makes the metal brittle. Ever see how a sword smith heats up the sword and then quenches it in water? It changes the properties of the metal. Your exhaust is not a sword so there's no need to do that and its not a toy so its not funny to do that.

[Snoek]

If u don't switch off aft riding becos it's hot. I think your bike will nv get to switch off aft it hav been switch on. What a question leh........

[spirals]

When i was a technician during army, the regulars there told me like, to at least idle ur engine for a while, before turning the ignition key off. It is not about cooling the engine, rather it is to let everything else (i'm not sure) to settle down, before off-ing the engine. Then let natural cooling take its place.