RPM doesnt return idle when close throttle..stays at last rev rpm

[0401897D]

hi guys....

 

my bike got prob afte prob...sorie for this long post

 

dis time its like dis...

 

when warming up the engine...for a few mins..den close throttle...the RPM doesnt decrease to idle speed...instead it "carry on" the same RPM as the last i rev.

 

means..if the last time i rev high..den close the throttle..the RPM is high

 

of the last time i rev moderate/low..den close throttle..the RPM is still moderate/low.

 

in short..it doesnt goes back to iddle rpm.

 

to counter dis..i rev higher than the 1st rev..n it goes back per normal..

 

as i urgently need to use the bike...i no choice but on the road when it happens i will clutch in...n rev higher to make it normal again(while riding)...these goes on for about 10 min of travelling...after tat it is normal...

 

these has been going on for about 2 times..the last 1 is last tuesday( fuel in reserve)..but after refuel...its perfectly fine...no prob..till today where fuel is low again

 

the last time i had SIMILAR situation is when, according to my mechanic, water goes into my fuel tank, but the pass few days it was not raining and i already fix the problem by covering my fuel cap.

 

i say it as SIMILAR coz..tat time the RPM will keep increasing like mad..unlike dis time..just stay but at higher RPM.

 

the only other stuff tat i put into my fuel tank...bside fuel is a few mothball..which works well b4 my skidd accident..

 

my guess will be either the throttle cable?? float/carb dirty??...or is it coz of the mothballs??if yes..how much roughly will it cost?..

 

any brightminds can help?...

 

frankly speaking..RXK is my dream bike..n would keep it at any cost..but the cost is begining to make a whole in my pocket...

 

TIA..

Edited August 28, 2010 by 0401897D
edit

[mfaisalby]

i face the same problem as you when i was riding my rxz last time. sent to workshop and they told me its carburator problem. did a carb service (wash and tune) and bike is back to normal. carb service cost ard $15.

 

and err.. one thing i wanna clarify... you put mothballs inside tank? those mothballs that is meant for cupboards is it? what function does it give when put inside tank? sorry ar first time hearing this. keen to know more.. thanks bro...

[ezzyoiler]

hi guys....

 

my bike got prob afte prob...sorie for this long post

 

dis time its like dis...

 

when warming up the engine...for a few mins..den close throttle...the RPM doesnt decrease to idle speed...instead it "carry on" the same RPM as the last i rev.

 

means..if the last time i rev high..den close the throttle..the RPM is high

 

of the last time i rev moderate/low..den close throttle..the RPM is still moderate/low.

 

in short..it doesnt goes back to iddle rpm.

 

to counter dis..i rev higher than the 1st rev..n it goes back per normal..

 

as i urgently need to use the bike...i no choice but on the road when it happens i will clutch in...n rev higher to make it normal again(while riding)...these goes on for about 10 min of travelling...after tat it is normal...

 

these has been going on for about 2 times..the last 1 is last tuesday( fuel in reserve)..but after refuel...its perfectly fine...no prob..till today where fuel is low again

 

the last time i had SIMILAR situation is when, according to my mechanic, water goes into my fuel tank, but the pass few days it was not raining and i already fix the problem by covering my fuel cap.

 

i say it as SIMILAR coz..tat time the RPM will keep increasing like mad..unlike dis time..just stay but at higher RPM.

 

the only other stuff tat i put into my fuel tank...bside fuel is a few mothball..which works well b4 my skidd accident..

 

my guess will be either the throttle cable?? float/carb dirty??...or is it coz of the mothballs??if yes..how much roughly will it cost?..

 

any brightminds can help?...

 

frankly speaking..RXK is my dream bike..n would keep it at any cost..but the cost is begining to make a whole in my pocket...

 

TIA..

 

it could just be a simple case of bad throttle cable..

any idea when was this cable oiled or repaced?? or the spring return koyak..

[ezzyoiler]

moth balls?..u listen too much of snake oil salesman

[crazydj]

Listen to the engine. If its louder, means its the engine. If it feels like idling sound, its your tachometer.

 

This both scenarios happened to me before. First one i got the magnetic coil fixed, the second time i just change a new tachometer.

[Lim Ah Wan]

Mothballs?? In Fuel Tank?? Im Curious. Something New Here.

[0401897D]

i face the same problem as you when i was riding my rxz last time. sent to workshop and they told me its carburator problem. did a carb service (wash and tune) and bike is back to normal. carb service cost ard $15.

 

and err.. one thing i wanna clarify... you put mothballs inside tank? those mothballs that is meant for cupboards is it? what function does it give when put inside tank? sorry ar first time hearing this. keen to know more.. thanks bro...

 

thank you faisal..really appreciate it...

 

yes it the one for cupboard..its function is to "clean" the engine..end result will be less smoke out of ur pipe.

 

tested n proven for old engine...those uncle2 using vespa also do dis..

 

nt sure bout new engine thou

it could just be a simple case of bad throttle cable..

any idea when was this cable oiled or repaced?? or the spring return koyak..

 

moth balls?..u listen too much of snake oil salesman

 

thank your ezzyolier...nt sure when it is replace or oiled...but i confirm tat the throlle goes back to its place..just that the RPM stays..will check tat up wif my mechanic

 

Listen to the engine. If its louder, means its the engine. If it feels like idling sound, its your tachometer.

 

This both scenarios happened to me before. First one i got the magnetic coil fixed, the second time i just change a new tachometer.

 

err..wat is the price of chancing the magnetic coil???

[crazydj]

So, the engine sounds loud? For me, it was free cause the bike still under one month warranty from the shop. I asked them before for YBR, it costs about $130 including labour like that.

[Aalex82]

Listen to the engine. If its louder, means its the engine. If it feels like idling sound, its your tachometer.

 

This both scenarios happened to me before. First one i got the magnetic coil fixed, the second time i just change a new tachometer.

 

u mean magnetic coil or ign coil??

magnetic coil dun influence the rpm..

[crazydj]

u mean magnetic coil or ign coil??

magnetic coil dun influence the rpm..

 

My bike the tachometer is electrically controlled not through a mechanical cable like others.

[Pandoras Kitten 3]

@ TS - is it possible to reduce your idling temporarily as the bike warms up? This is the simple, zero cost fix. Of course, you will then need to use the choke to start in cold weather/mornings.

[testamant]

hi guys....

 

my bike got prob afte prob...sorie for this long post

 

dis time its like dis...

 

when warming up the engine...for a few mins..den close throttle...the RPM doesnt decrease to idle speed...instead it "carry on" the same RPM as the last i rev.

 

means..if the last time i rev high..den close the throttle..the RPM is high

 

of the last time i rev moderate/low..den close throttle..the RPM is still moderate/low.

 

in short..it doesnt goes back to iddle rpm.

 

to counter dis..i rev higher than the 1st rev..n it goes back per normal..

 

as i urgently need to use the bike...i no choice but on the road when it happens i will clutch in...n rev higher to make it normal again(while riding)...these goes on for about 10 min of travelling...after tat it is normal...

 

these has been going on for about 2 times..the last 1 is last tuesday( fuel in reserve)..but after refuel...its perfectly fine...no prob..till today where fuel is low again

 

the last time i had SIMILAR situation is when, according to my mechanic, water goes into my fuel tank, but the pass few days it was not raining and i already fix the problem by covering my fuel cap.

 

i say it as SIMILAR coz..tat time the RPM will keep increasing like mad..unlike dis time..just stay but at higher RPM.

 

the only other stuff tat i put into my fuel tank...bside fuel is a few mothball..which works well b4 my skidd accident..

 

my guess will be either the throttle cable?? float/carb dirty??...or is it coz of the mothballs??if yes..how much roughly will it cost?..

 

any brightminds can help?...

 

frankly speaking..RXK is my dream bike..n would keep it at any cost..but the cost is begining to make a whole in my pocket...

 

TIA..

 

Hallo Bro,

 

I had a problem once with my Yamaha 125z,at a blip of the throttle the rpm will goes up and remain at around 2~2.5k rpm even though i balanced out the air and fuel mixture on the carbs.I did found out that the compression is leaking in the clutch internal rubber gasket.went to malaysia to get it quoted for 40 ringgit..like most bikers i was a happy guy..but the unhappy part is that for 125z, in order to fix the problem ,the leaking gasket was in the inner engine unlike rxz..so overhauling the whole engine must be done in order to get through the problem... after that the problem is gone.do check that on your bike.....funny thing is malaysian they do know a thing or 2 about reed valves and minor issues. =) good luck bro..

[0401897D]

@ TS - is it possible to reduce your idling temporarily as the bike warms up? This is the simple, zero cost fix. Of course, you will then need to use the choke to start in cold weather/mornings.

 

yes its possible..but y bro..need to reduce the iddling temporarily?..i mean ..wat would be the cause of it?...

Hallo Bro,

 

I had a problem once with my Yamaha 125z,at a blip of the throttle the rpm will goes up and remain at around 2~2.5k rpm even though i balanced out the air and fuel mixture on the carbs.I did found out that the compression is leaking in the clutch internal rubber gasket.went to malaysia to get it quoted for 40 ringgit..like most bikers i was a happy guy..but the unhappy part is that for 125z, in order to fix the problem ,the leaking gasket was in the inner engine unlike rxz..so overhauling the whole engine must be done in order to get through the problem... after that the problem is gone.do check that on your bike.....funny thing is malaysian they do know a thing or 2 about reed valves and minor issues. =) good luck bro..

 

thanks for ur sharing bro..

 

thanks guys.at least now u guys gave me an idea wat is the possible cause and the cost of it..thanks alot! really aprreciate it...

 

at least when i go the the mechanic..wat he say can understand the actual prob faster...thanks!

[0401897D]

back from the mechanic dis morning..he also say a variable of factors..so now he identify it as mayb the throttle cable nt enough lube..which is true..n say if it happen again..come back..den it may b to change the throttle cable...same as wat happen to my clutch cable..stuck stuck..

[Pandoras Kitten 3]

Good to know - sometimes the problem is from the most simple mechanism.

 

Btw I was having a bit of "overrunning" RPM issues sometimes due to my air filter not being changed after 10,000km. Amazing amount of crap everywhere! I changed the air filter out and whoa, like new bike. Don't put throttle also can accelerate. Got deafened before I reached 30kph.

[quikslvr]

Hahahah mothballs? Mythbusters prove that its plausible but i think it won't add any HP to your engine.Get rid of your mothballs.wont bring any benefits to it..

 

http://mythbustersresults.com/episode15

[Pandoras Kitten 3]

Hahahah mothballs? Mythbusters prove that its plausible but i think it won't add any HP to your engine.Get rid of your mothballs.wont bring any benefits to it..

 

http://mythbustersresults.com/episode15

 

My favourite is a statement I read that "a certain type of" mothball chemical will make the engine gum up and die. So if you buy the wrong type of mothball unknowingly.... Kaboom!!!