Question about 2000 Yamaha DT 125 R

1 Answer

Hi,i have yamaha dt 125 lc.In time to time it makes hole on its piston and sometimes when the engine is working makes problems and it seems like loosing power or the spark from the candle is to weak cause the sound of the engine is like AK-47 or more like heckler-koch mp5 :).I will be very happy if you can help me to solve this problem on my bike.Thank you!!!

Posted by on


1 Answer

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points


    An expert that got 20 achievements.


    An expert that got 10 achievements.


    An expert that got 5 achievements.

  • Master
  • 3,567 Answers

This sounds like pre-ignition, ( also called 'detonation' and 'engine knock' ), Carbon buildup on the piston crown gets overheated and then causes the fuel to ignite before the spark plug even fires. This pre-ignition is VERY hard on the piston and crankshaft bearings. You will need to pull the cylinder head and de-carbon the piston and cylinder head..... but I would first go to the dealer and buy a spark plug that is one step colder than the stock plug the manufacturer supplied when the bike was new. Spark plugs control the cylinder temperature, colder plug = lower head temp = less or no pre-ignition. Problem solved? If not, then go to a higher octane gas. Problem solved? If not then install a lower heat range thermostat in your water cooled engine, i.e. go from a 180 degree thermostat down to a 160 degree thermostat.

Posted on Mar 13, 2009


1 Suggested Answer

  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

a 6ya Mechanic can help you resolve that issue over the phone in a minute or two.
Best thing about this new service is that you are never placed on hold and get to talk to real repair professionals here in the US.
click here to Talk to a Mechanic (only for users in the US for now) and get all the help you need.

Posted on Jan 02, 2017


Add Your Answer

Uploading: 0%


Complete. Click "Add" to insert your video. Add



Related Questions:

1 Answer

1990 Yamaha DTR 125

Hi, Jonathan after careful deliberation 4 out 5 Yamaha Gods give this one a thumbs up, but just to be on the safe side you should give your local dealer's parts/service department a call to confirm. Good luck and have a nice day.
Yamaha dt 125 1988 Service manual Download service repair owne
Yamaha Owner Manuals
Yamaha DT parts book list and service manuals free download
Yamaha DT 125 1991

Feb 07, 2016 | Yamaha Motorcycles

1 Answer

How to fix a dtr engine w/ broken piston ring?

Hi, Anonymous sorry you can't find the first and best tool you ever bought for your Yamaha despair, not for a mere $0 you can download another one. For more information about your issue and valuable "FREE" downloads that you will need please visit the websites below. Good luck and have a nice day.
Yamaha DT 125 2003
OEM parts for Yamaha

Apr 27, 2014 | 2000 Yamaha DT 125 R

1 Answer

Yamaha dt 125 re water temp sensor light flickers has if theres a fault but bike dos not over heat it runs fine

Hi, Www_daniel_k if your water temperature light comes on or flickers and the engine does not seem to be overheating the usual suspects are:
1. Faulty temperature sensor.
2. Loose light bulb wire in the instrument harness.
3. Chaffed or pinched wire in the bulb circuit making contact with a power wire.
For more information about your question and valuable "FREE" downloads that you will need please click on the blue links below. Good luck and have a wonderful day.
Yamaha DT125RE 2005 Service Manual
OEM parts for Yamaha
YAMAHA DT125R Owner Manual
Yamaha DT 125 RE 2004

May 30, 2011 | 2005 Yamaha DT 125 RE

1 Answer

My dt125 01 plate has blown a ring on 2 pistons in the same place, the remains of the ring goes out the exhaust but it hit the power valve on the way out scoring the piston, the crank area is now making a...

Hi, Weedman01604 motorcycle engine repair isn't rocket science or nuclear physics find a shop that knows what they are doing and has an excellent reputation for more information about your question and valuable "FREE" downloads that you will need please visit the websites below. Good luck and have a nice day.
Yamaha Motorcycle Parts Spares From Europes Number 1 MSP
Yamaha DT 125 2000

Apr 16, 2011 | 2001 Yamaha DT 125 R

2 Answers

Hi. no spark on my yamaha dt 125 lc ypvs from 87. New cdi box. but same problem

sounds like the stator coil in behind the flywheel there are some electric tests for the stator but not allways correct I would try a stator

Mar 21, 2011 | 2000 Yamaha DT 125 R

1 Answer

Can i put 2002 yamaha dtr engine 125cc in a 1995 dtr 125cc bike?

well at first in wont fit because the cooling (LC) system will not fit the 02, but with a little welding and some alum works, you will be able to fit it.

the only difference will be the placing of the mount, weld holes and drill holes on the frame, but before you do so, remove all electric components from the frame.

hope this helps.

May 24, 2009 | 2002 Yamaha DT 125 R

1 Answer

Cogs in a gear box

hi karen, that is right, i do have a DT 125 myself and same thing has to be done.

Usually this is balance the engine so that the moving parts will move to a limited place. this is also to avoid further block damage when the piston is moving up and down.

Jan 01, 2009 | 2002 Yamaha DT 125 R

Not finding what you are looking for?
2000 Yamaha DT 125 R Logo

Related Topics:

1,042 people viewed this question

Ask a Question

Usually answered in minutes!

Top Yamaha Experts


Level 2 Expert

281 Answers


Level 3 Expert

899 Answers

Steve Sweetleaf
Steve Sweetleaf

Level 3 Expert

1147 Answers

Are you a Yamaha Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides