125fightingmachine Posted November 28, 2016 Share Posted November 28, 2016 Hi guys, This is actually the first time ever my bike has refused to start! So I stick choke on, start her up, she'll tick over fine for about 3-4 seconds then suddenly cut out.. Last night I was going to do a valve clearance adjustment - took all the timing caps etc off then realized my feeler gauge is all rusted and I can't see the numbers so I stuck all the caps back on and left her. Do you think this could in some way be related to my problem? All help grately appreciated. Happy riding, Louis Link to comment Share on other sites More sharing options...
Malky Posted November 28, 2016 Share Posted November 28, 2016 Hi Louis, probably unlikely it is related to the valve clearance as you say you didn't do anything so, if it was running before but not now it is more likely to be petrol or electrical. Your problem may be too much choke and flooding the engine. When the engine starts can you turn off the choke halfway and see what happens? Does the bike still splutter to a halt or does it shut down quicker? It may be with the colder weather the bike's choke may not be shutting down fully so in that case the bike is getting enough fuel to start but not to keep running or.... The fuel pump may not be working properly or the float is stuck in the chamber of the carb(s). What is the model number and age of the bike??? Good luck! 1 Link to comment Share on other sites More sharing options...
125fightingmachine Posted November 28, 2016 Author Share Posted November 28, 2016 Cheers for that malky, I've got a day off tomorrow as I'm ill so I'll get down to the bottom of it then! I'm fine with carbs etc so that's not an issue. It's a ybr 125 2007 model. Have just been outside to start her up -started on full choke, dropped down to half and instantly died.. Link to comment Share on other sites More sharing options...
jimmy Posted November 28, 2016 Share Posted November 28, 2016 It's been cold of late, so start on full choke and leave it for a couple of minutes. If you hear the bike start to rev then gently close the choke off as bit Link to comment Share on other sites More sharing options...
125fightingmachine Posted November 28, 2016 Author Share Posted November 28, 2016 It's got a carburetor btw, sorry forgot to mention that. Jimmy, I've started her on full choke and she cuts out after about 3-4 seconds.. That's the problem in hand. If I give her a very wee amount of throttle she'll stay running a little longer but will splutter like mad! Link to comment Share on other sites More sharing options...
jimmy Posted November 28, 2016 Share Posted November 28, 2016 51 minutes ago, 125fightingmachine said: 14 minutes ago, 125fightingmachine said: I've started her on full choke and she cuts out after about 3-4 seconds.. Have just been outside to start her up -started on full choke, dropped down to half and instantly died.. Are you cutting it down to half choke, if so just leave it for a few minutes or until the engine starts to race. I don't use my bike much in the cold weather, but when I do I will leave the choke on for about the first 1 - 1.5 miles Link to comment Share on other sites More sharing options...
125fightingmachine Posted November 28, 2016 Author Share Posted November 28, 2016 I'm sorry jimmy but your missing the point bud (maybe I wasn't explaining myself clear enough) - I start her on full choke but she cuts out after 3-4 seconds Almost like she's not getting enough choke Link to comment Share on other sites More sharing options...
125fightingmachine Posted November 28, 2016 Author Share Posted November 28, 2016 I can now keep her running only on full choke at full throttle but all I'm smelling is unburned gas Link to comment Share on other sites More sharing options...
125fightingmachine Posted November 28, 2016 Author Share Posted November 28, 2016 I've also got an oil fouled spark plug Link to comment Share on other sites More sharing options...
125fightingmachine Posted November 28, 2016 Author Share Posted November 28, 2016 PROBLEM SOLVED - spark plug had died which led to it getting covered in fuel, and that also explains the unburned fuel.. Link to comment Share on other sites More sharing options...
Malky Posted November 30, 2016 Share Posted November 30, 2016 Funny, I was just about to write check the plug as I was working my way down the posts. Glad you got it fixed. 1 Link to comment Share on other sites More sharing options...
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