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

    Superstar:

    An expert that got 20 achievements.

    All-Star:

    An expert that got 10 achievements.

    MVP:

    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

Add Your Answer

Uploading: 0%

my-video-file.mp4

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

×

Loading...
Loading...

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.
http://www.dirtntrial.com/tuning.htm
Yamaha DT 125 2003 http://www.dt125.cz/download/Owners_Manual-DT125X_RE.pdf
OEM parts for Yamaha
http://www.motogelnar.cz/manual/YAMAHA/DT125X_RE-05-Service_Manual.pdf

Apr 27, 2014 | 2000 Yamaha DT 125 R

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.
http://www.motogelnar.cz/manual/YAMAHA/DT125X_RE-05-Service_Manual.pdf
Yamaha Motorcycle Parts Spares From Europes Number 1 MSP
http://www.dt125.cz/download/Owners_Manual-DT125X_RE.pdf
Yamaha DT 125 2000
http://www.dirtntrial.com/tuning.htm

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:

1,038 people viewed this question

Ask a Question

Usually answered in minutes!

Top Yamaha Experts

Steve Sweetleaf
Steve Sweetleaf

Level 3 Expert

1128 Answers

D. E. Hev

Level 3 Expert

1059 Answers

mikeuk

Level 2 Expert

61 Answers

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

Answer questions

Manuals & User Guides

Loading...