Question about Suzuki GSX-R 750 Motorcycles

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When I roll into the throttle, it feels like the clutch disengages. The RPM's rise, but the road speed doesn't.

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You have a severe case of a badly worn clutch but in all honesty i have no idea how to change it in this model ,unlike a 1957 bsa that we put new corks into the plates outside a pub in 1968 on the way to southend on sea ,sorry

Posted on May 27, 2010

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Car surging


Is the car equipped with the Automatic Transmission?
If so, read on.
Otherwise skip to the end and answer some questions.

POSSIBLE SCENARIO:
I have observed a condition where my car surges slightly when the torque-converter clutch (TCC) cycles between lock and unlock when driving on an uphill grade.
First some basics and history that will explain why the TCC is used.

Engine, Torque Converter, TCC, and Transmission relationship--
The TCC allows for a solid connection between the engine and transmission which allows the input to the transmission to rotate at the same speed as the engine.
Without a TCC, there is slippage between the engine and automatic transmission. The slippage is greatest at low engine RPM. That is what allows the engine to run with the automatic transmission in gear, like when you first shift into gear or stop at a stop sign. When the throttle pedal is depressed, the engine RPM begins to increase and the torque converter begins to slip less and less the more the engine RPM increases. The car moves. But even at cruising speeds the torque converter slips slightly. Engine RPM is greater than transmission input RPM, which is realized as slight decrease in fuel efficiency.
When acceleration is complete and a constant speed is being maintained, the engine power output is reduced to the point where the TCC can engage and eliminate any slippage between the engine and transmission. If the car has a tachometer the engagement of the TCC can be verified when a slight reduction in engine RPM observed without a corresponding change in vehicle speed.
One method used to test the operation of the TCC is as follows:
Find a flat section of road where it is safe to perform the test.
Reach a steady speed and keep the gas pedal depressed with one foot. While observing the tachometer (or listening for an increase in engine RPM), with the other foot depress the brake pedal enough to activate the break light switch but not enough to engage the brakes. When the brake light switch activates, the TCC receives a signal to disengage. With the gas pedal being held steady, release the brake pedal and the engine RPM should decrease when the TCC engages.
Old cars with Automatic Transmissions did not use a TCC. I believe the TCC was put in use in an attempt to increase fuel economy.

MY EXPERIENCE WITH SIMILAR SYMPTOMS
The condition that causes that issue on my car is this:
- A slight uphill grade increases the load on the engine.
The car tends to gradually slow and it is necessary to depress the gas pedal to maintain speed.
- Depressing the throttle pedal (manually, or automatically with cruise control engaged) signals the torque converter clutch to unlock when the load increases slightly. (A more drastic load increase would signal the Transmission to downshift to a lower gear.) The corresponding increase in engine RPM and output is enough to compensate for the reduction in speed. When the vehicle speed, engine RPM, and throttle position stabilize to the point that the TCC will engage and the engine RPM will reduce in correspondence with TCC engagement. Now, if the road conditions have not changed, power output is not enough to maintain vehicle speed. With the increased load caused by full engagement between engine and transmission, and the cycle (surging) repeats itself until the road conditions change.

Does that help?
If not:

QUESTIONS
Please define the symptoms.
What are the road conditions when the surge occurs? (A slight uphill grade?)
What is the frequency of the surge?
Does the engine power output have a noticeable surge?
Is there a speed change related to the surge?
Does the tachometer move up and down with little or no change in vehicle speed?
Are all instrument indication in the normal range?
What else has changed?

Good luck!

May 24, 2014 | Subaru Impreza WRX STi Cars & Trucks

2 Answers

Electronic throttle control


I have a 2008 Road King Classic with (the first year) TBW (Throttle By Wire - replacing throttle cables) and have no problems with it, and it doesn't do as yours does, but acts smoothly like a cable system.

My first suggestion is to take the twist grip off (you have to remove the master cylinder and switch housing) and check it's bore, and the handlebar end it rides on, for any built up crud (rust, dried up lube, etc.).

Oct 20, 2013 | Harley Davidson Motorcycles

1 Answer

Engine revs up and down when airconditioning is on


The ac compressor takes around 5 hp to drive so when the clutch engages the idle speed will drop around 250rpm amd when the clutch dis-engages the rpm will rise 250 rpm If you have a efi computer controlled vehicle the computer should automatically adjust the rev difference to maintain a constant rpm. If you have a carby vehicle there is a electric over vacuum control that you can fit to the accelerator lever that when the clutch activates the power to the switch from the clutch opens a valve that allows vacuum to pull the throttle open and maintain a constant rpm

Aug 01, 2013 | Air Conditioning and Heat for Pontiac G6

1 Answer

Car shimmys while idles


the throttle body idle lever can wear out causing cars rpm to drop-chec gauge to confirm-wil be around 500------also motor mounts wear-need to test using emergency brake and watchn engine rise n fall

Jul 08, 2013 | 2002 Pontiac Grand Am

1 Answer

How can you tell the clutch is slipping ?


If the revs rise but the speed doesn't seem to increase when the engine is under load...it's slipping.
Does not always mean a new clutch is needed though...try adjusting it first.

Apr 02, 2012 | 2007 Yamaha Road Star Silverado

1 Answer

Bike surges at all speeds, not sure if its a fuel issus or a clutch issue


Surging is usually a fuel problem. To prove it, put the bike in one gear lower than the top gear. You didn't say what year or model bike you have. If it's a five speed, put the transmission in fourth gear. Do a full throttle roll-on acceleration with the transmission in that gear on a long uphill grade. If the engine RPM's climbs suddenly and drastically without the speed of the bike doing the same, it's a clutch slipping problem. More than likely, you are feeling the surge due to a lean fuel air mixture. This makes it very difficult to maintain a steady cruising speed in all gears.

Good Luck
Steve

Sep 13, 2011 | Harley Davidson FLHR-FLHRI Road king...

1 Answer

I have a 1998 Lincoln Mark VIII. It was overheating and my diagnostics stated sensor had low input. I replaced the sensor and the thermostat. It idles fine with no overheating, but as soon as I go down the...


Carefully raise the engine RPM above 2000 and observe the Radiator hoses for collapse. Have your cap checked for holding pressure.

The electric fans usually are 2 speed units. Check with Autozone or Oreillys for the relays which switch to high speed. Some rely on a second temp sensor; you may have changed the dash gauge temp switch and not the fan speed temp switch.

Then if no success you need to get the Fan clutch checked with a timing light. The fan clutch is designed to lock at higher temps. It is suppose to slip in cold weather. A mechanic would take a timing light with a RPM scale and compare the crankshaft RPM with the fan RPM to see if the fan clutch is bad.

Aug 25, 2010 | 1998 Lincoln Mark VIII

1 Answer

I put the bike in gear but when i pull the clutch lever in, it wont disengage and stays in gear??


if the clutch lever feels it has plenty of tension, it may just be the clutch plates stuck together from sitting.

Roll start it and ride around while holding in the clutch, vary the throttle, and they usually unstick. Give it an oil change when it warms up.

May 18, 2010 | 2004 Honda CRF 250 R

1 Answer

Loss of power


Clutch slippage would be a possibility. While rolling in 5th gear mid-range in the rpm band give the bike a lot of throttle. Do the rpms rise significantly without the speed of the bike increasing? If so you may need a new clutch or possibly just new springs. If you have put any oil additive it is possible your clutch friction plate(s) became contaminated.

Jan 03, 2009 | 2000 Honda NSR 125

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