Question about Yamaha DT 125 X Motorcycles
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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Posted on Jan 02, 2017
Hi and welcome to FixYa,
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
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
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
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
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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