Question about Suzuki RM 125 Motorcycles

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Is the power valve on a 86 rm 125 supposed to be open at startup, or does it open up gradually as throttle increases

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Posted on Jan 02, 2017

  • 71 Answers

SOURCE: 2005 RM 85 fouling plugs every ride.

obviously theres way to much oil in the mix. Speak to your local bike shop and ask them on the best mix for the bike

Posted on Nov 28, 2008

  • 3567 Answers

SOURCE: 2003 Suzuki RM 125 with no power band.

Scatter gun approach > thoughts to check out > > >
Clean and dry the air filter? Go back to a stock main jet, at least to check things out? Are "O" ring seals on the main jet going bad?Partial internal collapse in exhaust (remove exhaust pipe & do a quick run down the alley), Install a new stock NGK spark plug, Be sure battery connections are clean and tight, Be sure intake manifold and carb are good and tight.

Hope this helps!

Posted on Apr 04, 2009

  • 4 Answers

SOURCE: spark plug size in a 86 rm 125?


Posted on Apr 21, 2009

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SOURCE: i want my powerband to come in at a lower rpm. it comes in at 3/4 qt throttle! 96 rm 125

You can experiment with different expansion chambers. The cone shape of the chamber bounces a sonic shock wave back to the exhaust port. The wave forms a pressure "wall" at the port to "seal" the exhaust port so intake gasses don't escape. Change the wall timing and you change the powerband. This is the expensive way and with no guarantees. The bike may already have the best possible chamber.

I suggest you go a different route. Just go up about four teeth on the rear sprocket or down one tooth on the front sprocket. This will mean the bike will have a lower top speed but more torque and earlier powerband relative to mph speed. Bottom line is you will come out of the hole quicker with higher revs and reach the powerband sooner. The loss of top speed is overcome by the speed out of the corners. Generally, more time is spent in first, second and third than the brief moments spent in fifth or sixth.

Please consider a top rating for this solution. Thanks!

Posted on Jun 01, 2009

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SOURCE: how to change throttle cable on 2005 rm 125

The carburator will need to remove the seat and gas tank.The top of the carb will turn off counter clockwise, then you can pull the "slide" up out of the carburator. Note which is the front for re-assemble. There is a spring between the slide and cap, and look into the slide to see if your cable clips in, or may have a phillips screw and plate to remove to get the cable free. I use needle nose pliers to hold the spring back to remove and replace the cable.
The throttle end is easier. Remove the plastic cap and unthread the adjusting worm nut. The cable end "ball" will come out with the help of needle nose pliers also. Pull the cable slack up to rotate the "ball" out of the throttle tube.
Hope this helps!

Posted on Jul 19, 2009

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I own a bajaj discover 125 cc dtsi the pick up has fallen drasticaly on increasing the throttle the engine rpm seems not to increase after the speed of 45 kmph.please suggest the problem.....thank u

Hi, Sudip966 and the usual suspects are:
1. Severely drained or faulty battery.
2. Faulty regulator/rectifier or high output coil.
3. Faulty power valve, solenoid or installation.
4. Clogged air filter or exhaust.
5. Cracked or incorrect float level.
6. Float needle is not seating.
7. Faulty reed valve.
For more information about your question please visit the website below. Good luck and have a nice day.
Manual Kawasaki Bajaj Wind 125 Documents

Aug 13, 2011 | 2006 Bajaj Wind 125

1 Answer

I have an automatic, toyota 4runner. The RPMs are high when driving normal (like 4) going 80+ kph (im in japan, hence the kph). I know this isn't normal. Sometimes, it will "shift" gears and go...

The transmission depends on input from the vss, crank sensor, and tps for shift points. Assuming the speedometer is working, I recommend you run the test below on the tps. Also put the connector back on the tps and check the voltage on terminal VTA with the key on by probing the back of the connector. Open the throttle gradually and verify that the voltage increases linearly with throttle opening. If not, replace the tps.

Throttle Position Sensor OPERATION Throttle position sensors are usually mounted on the side of the throttle body. The sensor detects the throttle valve opening angle. The voltage of terminal VTA increases in proportion of the opening angle of the throttle valve. The ECM judges the driving conditions from the input signals of the terminals, and uses them as one of the conditions for deciding the air/fuel ratio correction, power increases and fuel cut-off control.

TESTING 3VZ-E and 1FZ-FE Engines
  1. Confirm that the throttle valve is fully closed.
  2. Connect an ohmmeter to terminals IDL and E2.
E2 is the bottom terminal, while terminal IDL is positioned directly above it.
3. Insert a 0.020 in. (0.50mm) thick feeler gauge between the throttle stop screw and lever. Check for continuity between terminals IDL and E2 of the sensor. Continuity should be present.
4. Insert a 0.031 in. (0.80mm) thick feeler gauge between the throttle stop screw and lever. Check for continuity between terminals IDL and E2 of the sensor. Continuity should not be present.


Aug 07, 2017 | 1994 Toyota 4Runner

1 Answer

Does the RM 125 have a power valve? The mechanic said that the power valve is broken.If you can show me a diagram of the engine I would know what to look for when I go to buy the parts. thank you

It depends on what model the bike is. They didn't start putting them in until 1986 so if its newer than that then it has one. Go to a place like and look at Suzuki parts, pick your year and model and look for exhaust valve.

Feb 20, 2010 | 2005 Suzuki RM 125

1 Answer

Hi i got a rm 125 06 the bike starts and rans but it wont power band at all wat could it be

First check the exhaust and air box are in good condition no holes or cracks ,as either will ruin the fuel mixture especially on a 2 stroke . all so try a new plug as this can foul up and is a cheap starting point. Put fresh fuel in and drain carb if req. Also check air filter is clean and set fuel mixture properly,cleaning the carb or injection nosel may help. If a power valve is fitted check it is moving ,remove valve cover and exhaust at the barrel then pull the cable the valve must compleatly expose the exhaust port at fully open. Finally if this does not work the piston or bore may be worn very common on 2 strokes ,look down the exhaust port and look for scores down the barrel.and replace if worn.

Feb 12, 2010 | 2005 Suzuki RM 125

1 Answer

What causes compression loss on a 1998 yz125? could power valve stick open or closed causing this? it was running fine and gradually has to be pull started. once i get it running it will not open up. it...

Pull started? on a YZ 125?
The power valve will not allow high RPM power if it is gummed up.
Low compression is due to bad rings, a different problem.
You may have both problems.

Jan 15, 2010 | Yamaha YZ 125 Motorcycles

1 Answer

Not idleing not running smooth when excelerating and no powerband.

First, do a compression test (Throttle wide open during this)
Make sure the air filter is CLEAN!!!
You may have an issue with...
power valve sticking
crank seal leaking
worn out rings
dirty carburator

Dec 21, 2009 | 2003 Suzuki RM 125

1 Answer

Do you know how many pounds of compression a 2002 rm 85 should have?

Air filter clean, hold throttle wide open, and kick until the compression gauge stops climbing.
100 psi at a minimum.

Nov 04, 2009 | 2003 Suzuki RM 125

1 Answer

Suzuki RM 85 exhaust valve adjustment

I will come back to you with the method for adjusting this.
If you set the power valve to open at a higher rpm or restrict the vavle from opening to its maximum then your problem will be solved.

If you do the latter though you will definately lose your power at high rpm.

Aug 04, 2009 | 2003 Suzuki RM 125

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