stevie16v Posted November 26, 2008 Share Posted November 26, 2008 Right, Story goes like this. I have been doing some work on a yamaha sr125 which has been sitting for a year. Finally got it (almost) up and running. Had it out a scoot last week and it was fine. i turned it off, 15mins later i went to go again, Made it about a mile and it started chugging then just died. re-started it. Made it about 50m, same again. This time i had to bump start it. Made it another 50m and it was a goner. so pushed it the mile home (yes it hurt)I put a new battery in it as i thought that was the problem. but no. I have stripped, cleaned and made sure the carb settings are all correct. Whenever i open up the throttle it will give a rev then nothing. Engine still ticks, i have to come off the throttle to do it again. When i go to move, it will do the same, Will build up speed to about 10mph, then theres no power, and it will chug again until it cuts out. This is my first bike and i have spent a fortune on parts, Im pretty downhearted by it. Can anyone suggest anything? Quote Link to comment Share on other sites More sharing options...
Bill_on_a_bike Posted November 26, 2008 Share Posted November 26, 2008 SRs (not just because I have one) are said to be quite reliable and generally problem free. There's not any kinda, running issue, that i'm aware of. The way I see it your options are to test and check everything again, see if you can find and fix the problem. Or if you can't be arsed and you're sick of the sight of it just cut your losses and sell it for what you can get. Quote Link to comment Share on other sites More sharing options...
stevie16v Posted November 26, 2008 Author Share Posted November 26, 2008 The thing is, I got it cheap, it was just the bits that have added up. and it is a nice wee bike, i'ev put alot of work into it. Wish there was some magic wee answer that could resolve it! Quote Link to comment Share on other sites More sharing options...
Guest Posted November 26, 2008 Share Posted November 26, 2008 suspect the cdi unit ... sr's are prone to cdi failure due to vibration.......mine would not allow me to go over 45/50 mph and then it just died change dit and wooomph off it went Quote Link to comment Share on other sites More sharing options...
stevie16v Posted November 29, 2008 Author Share Posted November 29, 2008 Well, After a lot of kicking tyres and moaning, I carried out more work on the bike, mainly cleaning parts etc, again i drained the fuel tank! This time, i remembered to put it onto reserve as opposed to just the fuel line. Fresh fuel and voila, like magic! Rode it home, bloody battery died again! Turned out my earth connection to the chassis should have been to the engine! so hopefully it will still be charged when i take it home after work tonight. Only problem i have left now is that. The book says idle screw, 1 1/4 turns out, mine is about a quarter of a turn out, if i bring it out anymore the engine labours way too much until it eventually cuts out, i also need to hold the choke out for about 3-5 mins before i can let it in or else the bike cuts out. Any suggestions? Quote Link to comment Share on other sites More sharing options...
Bill_on_a_bike Posted November 29, 2008 Share Posted November 29, 2008 Well, After a lot of kicking tyres and moaning, I carried out more work on the bike, mainly cleaning parts etc, again i drained the fuel tank! This time, i remembered to put it onto reserve as opposed to just the fuel line. Fresh fuel and voila, like magic! Rode it home, bloody battery died again! Turned out my earth connection to the chassis should have been to the engine! so hopefully it will still be charged when i take it home after work tonight. Only problem i have left now is that. The book says idle screw, 1 1/4 turns out, mine is about a quarter of a turn out, if i bring it out anymore the engine labours way too much until it eventually cuts out, i also need to hold the choke out for about 3-5 mins before i can let it in or else the bike cuts out. Any suggestions? Book / factory settings for carbs are often inaccurate once the engines old and things are dirtied up and not the same shape ect. Quote Link to comment Share on other sites More sharing options...
stevie16v Posted November 29, 2008 Author Share Posted November 29, 2008 Good stuff. I was concerned mayebe the carb was on the way out or even worse Well, After a lot of kicking tyres and moaning, I carried out more work on the bike, mainly cleaning parts etc, again i drained the fuel tank! This time, i remembered to put it onto reserve as opposed to just the fuel line. Fresh fuel and voila, like magic! Rode it home, bloody battery died again! Turned out my earth connection to the chassis should have been to the engine! so hopefully it will still be charged when i take it home after work tonight. Only problem i have left now is that. The book says idle screw, 1 1/4 turns out, mine is about a quarter of a turn out, if i bring it out anymore the engine labours way too much until it eventually cuts out, i also need to hold the choke out for about 3-5 mins before i can let it in or else the bike cuts out. Any suggestions? Book / factory settings for carbs are often inaccurate once the engines old and things are dirtied up and not the same shape ect. Quote Link to comment Share on other sites More sharing options...
Bill_on_a_bike Posted November 29, 2008 Share Posted November 29, 2008 Well, if you've ever got some spare time you can always clean the carb up. You can find companys that sell carb overhall kits, new seals and jets and stuff.If you find one for the SR lemme know, I may well do this over winter. Quote Link to comment Share on other sites More sharing options...
Guest Posted November 29, 2008 Share Posted November 29, 2008 check that all connections between carb & engine are airtight ( no splits/rubber perished and clips are tight)Clean the air filter before making any adjustments and adjust on a warm engine Quote Link to comment Share on other sites More sharing options...
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