Question about Yamaha DT 125 X Motorcycles

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Low compression after changing broken piston rings, dt won't start, and after bump start works very bad, low compression, low power

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  • Master
  • 1,101 Answers

Have you checked the valve gap if the valves are open this will cause low compresion if not there may be a crack in the head or cylinder but not to clever with bikes sorry

Posted on Nov 20, 2013

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6ya6ya
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Posted on Jan 02, 2017

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Benimur
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SOURCE: low compression after a overhaul???

Hi and welcome to FixYa,

Initially, check:
presence of spark at the sparkplug tip/electrode;
fuel entering the combustion chamber. You can check this by removing the air filter assembly and covering the mouth of the carb with the palm of your hand;
it may also just be that the combustion chamber has too much 2T oil, try replacing you sparkplug.

Good luck and Thank you for using FixYa. Happy New Year.

Posted on Jan 02, 2009

  • 221 Answers

SOURCE: rm125 power/starting problems

do a leak down test,and compression test,if your cyclinder is damaged you will have to bore it and replace your piston,and if you have an exhaust valve you may need to adjust or replace. check exhaust system could be clogged

Posted on Jul 03, 2009

  • 1 Answer

SOURCE: 2003 Heritage Starter Problems

I have an 03 FLSTC, same issue. Went through four starters before 70k miles. Problem solved when I had both the gear reduction and compression releases installed. Have 40k miles on my fifth starter and no problems.

Posted on Jul 26, 2009

  • 136 Answers

SOURCE: yamaha dt 125r power valve

Your barrel? LOL. Sounds like the valves need to be gone through. I would suggest taking and valve train apart and put it back together correctly then go from there.

Posted on Aug 08, 2009

  • 269 Answers

SOURCE: NO COMPRESSION

This could be a number of things, none of which will be solved without revisiting the motor again. Give some thought to the following:
Check cam and gear timing. Did you repace the cylinder and or hone it, bore it? Did you gap and offset your rings correctly? Have you checked the valve train to see if you have a valve not closing?
You see there are a number of possible causes for this...you will have to go through one at a time and eliminate them.

Posted on Oct 05, 2009

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2 Answers

What is a cylinder compression how much do it cost to replace it


If you have low (or no) compression in one or more cylinders, it can be due to broken/bent valves or valve seats, bad or broken piston rings, or mechanical timing way off. The cost to correct is very dependent on the specific cause. Best case is mechanical timing is way off (this will show up as low/no compression in all cylinders), assuming no other mechanical damage was done. Worst case is engine rebuild or replacement.

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Compressor motor runs but does not make compessed air


Some of the things for you to check are for any leaks anywhere, the valve plate assembly, the piston and cylinder assembly and the con-rod. If you have any leaks that let air out as fast as the piston is trying to pump it in you won't get any compressed air. Check the drain valve on the bottom of the tank and the air line from the pump to the tank. If any of the reeds on the valve plate assembly are bent or broken they won't seal the way they need to in order to compress air. If the cylinder is badly scored or the piston rings are scored or broken the piston won't pump compressed air into the tank. If the con-rod is broke the piston won't work at all.

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Leaking oil into the cylinder


This could be valve seals on these 2 valves. Or this could be bad alignment of the rings groves when they were installed. Have you done a compression test this is where i would start.And if you suffer low compression the compression rings could be broken or aligned improperly. If you need further help just ask me.Remember to rate my solution

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1998 nissan altima has low compression on one cylynder


Might be a bad cylinder head gasket at this cylinder. A radiator compression test can find the problem. Might be a bad valve, or a frozen (stuck) piston ring, or broken piston ring. To isolate the problem to the valves or rings, you have to add a little 30 weight oil inside cylinder through spark plug hole. Repeat the compression test. The oil temporarily seals the piston rings. IF the compression is still low then you have a bad valve. Good luck.

Oct 14, 2010 | Nissan Altima Cars & Trucks

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#2 cylinde r head bad. how to repair low compression


First thing you need to do is determine why the compression in that cylinder is low. Four possible causes are 1. blown head gasket 2.bad valve(s) in the head 3. broken compression ring, piston ring land or burned piston. 4. rounded camshaft lobes
One other possibility is a fuel washed cylinder (from leaking injector)
You are going to have to remove that cylinder head and do a thorough internal inspection, possibly involving oil pan and piston removal.
Once the cause has been found you can proceed to make an appropriate repair. Or if the damage is beyond your ability, replace the engine with a used or new one.
There is no quick easy fix to restore compression.

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1 Answer

Low compression on one side, one fowled plug


A compression leak down test would tell you where the compression leak is coming from, and you should call around to find a repair shop that knows what a compression leak down test is.

A burnt or bent intake or exhaust valve, warped cylinder head or faulty head gasket, or a damaged piston or piston compression ring could cause a compression leak, and a leaking intake manifold gasket that allows oil to enter the intake through the lifter valley could foul out a spark plug, and also it could be a damaged piston or broken piston rings that is fouling out the spark plug.

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Poulan wild thing leaf blower won`t start. Has


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1 Answer

Low compression on my kxf250.2004 bike doesnt kick,bike runs fine


It sounds like time to do a top end job. The head will need to come off, then the valves should be re-seated. Carbon should be removed from the head and piston crown. Since you did not mention any engine smoking, I assume the rings are okay. If you are going to do anything with the cylinder, piston and rings, now would be a good time. But remember, if it isn't broken don't fix it.

If you do the work yourself be sure to start with the piston on TDC compression. Note the timing marks stamped on the overhead cam. The piston and marks will need to be in the same position when reassembling.

Go to the site below where you can see a parts diagram for your specific bike. You will select the actual brand, year, model, etc., once you go to the site. Part numbers and prices are also shown. You can order parts from this site. In the event no price is shown on a particular part, the part is not in stock.
www.babbittsonline.com/pages/parts/viewbybrandand/parts.aspx


Jun 05, 2009 | 2004 kawasaki KX 250 F

3 Answers

Yz 250 wont kickstart


Hi!
You obviously look after your machine and very sensible when laying up, however as you are probably aware 2 strokes rely heavily on compression, A. to produce excellent combustion and B. to draw fuel into the chamber. So when you try kick starting you can't get enough revolutions to draw the correct amount of fuel into the cylinder, where as you push start you constantly turn over the engine increasing compression slightly and bingo it fires.
Can you remember how when kick starting it before this problem the feel on resistance when kicking over? has it now become a lot easier? if so you possibly have worn or broken compression piston rings.
A compression test will reveal this, I hope this sorts your query?
Press the Blue button please for my FREE effort,
Thank You!
Paul 'W' U.K.

Feb 06, 2009 | 2000 Yamaha DT 125 R

1 Answer

Yz 250 1992 wont kick start


check your compression I had a 94 yz that done that when i checked the compression it was really low so I put new rings on the piston and that's all it took to bring her back to life

Feb 03, 2009 | 2000 Yamaha DT 125 R

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