mike_dt125r Posted August 2, 2009 Share Posted August 2, 2009 I have recently bought a Dt125 R 2001 2 stroke, which I am having trouble with. When I bought the bike it was in a pretty poor condition but the engine seemed to run ok. I have been running the bike daily and it had really poor acceleration and bottoms out at 55 mph I have checked the air filter, changed the oil, clutch plate and cable and also fitted the correct spark plug (as some fool was using the wrong one). Also changed the oil settings, as it was really drinking oil and checked the boost valve settings. The bike seems to run better and is quicker, but I still don't think its as quick as it should be and still bottoming out at less than 60mph A friend of mine seems to think that it might be oil in the exhaust system from poor oil settings and also it might need de-chocking but i have no idea how to do this? Any suggestions on what to use? The bike seems to do about 100 miles on a full tank? is this right? Also I have noticed, if I have the full beam on and I break I practically loose my main beam! Is this normal? I figure its the battery which needs replacing, Could the 2 issues be related? Any suggestions would be great! Am going out of my mind! lol Link to comment Share on other sites More sharing options...
jordanscycles Posted August 3, 2009 Share Posted August 3, 2009 a bike with a happy battery will always work better, try charging it. Link to comment Share on other sites More sharing options...
Rudi Posted August 3, 2009 Share Posted August 3, 2009 The bike seems to run better and is quicker, but I still don't think its as quick as it should be and still bottoming out at less than 60mph Maybe its still restricted, they have a reed switch in the speedo that stops the revs from incrasing once the speedo hits 60mph, a quick way to work out wether you still have this or not without taking apart your speedo is to read the revs that the bike usually tops out at then remove the speedo cable where it attaches to the speedo drive at the wheel, then take it out for a ride and see if it passes the rev it usually stops at(of course this time they should go higher because the speedo wont hit 60 because its not connected), once you have determined if you have got the restriction refer to this page http://www.dtr125.net/tuningf.htm for instructions on how to remove it along with other restrictors. Link to comment Share on other sites More sharing options...
mike_dt125r Posted August 3, 2009 Author Share Posted August 3, 2009 Thanks Rudi. If the bike was restricted would that affect the 0-60 as well as the top speed? Link to comment Share on other sites More sharing options...
pete79 Posted August 3, 2009 Share Posted August 3, 2009 Thanks Rudi. If the bike was restricted would that affect the 0-60 as well as the top speed? hey check the piston rings i had same problem on a tzr new rings solved the prob like new bike take off and top end Link to comment Share on other sites More sharing options...
pete79 Posted August 3, 2009 Share Posted August 3, 2009 hey check the piston rings i had same problem on a tzr new rings solved the prob like new bike take off and top end exhaust maybe or will be restricted baffles and cat removal helps Link to comment Share on other sites More sharing options...
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