starr870 Posted July 14, 2013 Report Share Posted July 14, 2013 Hi I tried starting my 98 250 techno this morning and had no joy, it started fine last week after I had changed the gearbox oil and air filter. It has fuel as the plug is wet when I take it out, but it also has a spark as ive had the plug laid on the head and turned it over by hand. I have had the plug in the bike since last October and its always started first or second kick, I hav'nt got another plug to try at the moment, what could be wrong? Andy. Quote Link to comment Share on other sites More sharing options...
boghopper350 Posted July 14, 2013 Report Share Posted July 14, 2013 How old is the fuel? Quote Link to comment Share on other sites More sharing options...
starr870 Posted July 14, 2013 Author Report Share Posted July 14, 2013 The fuel is from a can I filled at the petrol station about a month ago. Quote Link to comment Share on other sites More sharing options...
starr870 Posted July 14, 2013 Author Report Share Posted July 14, 2013 The plug in the bike when I got it was a ngk bp5es, is this the one I should replace the old on with? Quote Link to comment Share on other sites More sharing options...
boghopper350 Posted July 14, 2013 Report Share Posted July 14, 2013 Is the carb a mikuni? If it was running ok on that plug and if it looked the right colour, there should be no need to change it. My son has an old synt and that runs fine on the plug you mentioned. Quote Link to comment Share on other sites More sharing options...
starr870 Posted July 14, 2013 Author Report Share Posted July 14, 2013 Yes it has a mikuni carb, I did see fuel leaking from a small brass pipe by the side of the float bowl last week but it seems ok now. Quote Link to comment Share on other sites More sharing options...
boghopper350 Posted July 14, 2013 Report Share Posted July 14, 2013 I think that you could have flooded it, possibly by leaving the fuel on while it stood? We had the same thing happen on the synt. The float bowl keeps filling sometimes and runs into the crank an it wont start whatever you do. The only thing that worked for us is, cable tie the front brake, remove the spark plug, get two of you to lift the back wheel up and keep going until you go past the vertical. Then kick the engine over with the kick start. You should see a lot of petrol coming out of the plug hole. It sonds like a mission... but it worked for us. He doesn't leave the petrol on any more while the bike stands. Quote Link to comment Share on other sites More sharing options...
0007 Posted July 14, 2013 Report Share Posted July 14, 2013 Probably a leaky needle and seat, mine hydraulic locked it flooded so bad Once the plug has fouled it's junk, huck it and replace with a fresh one Quote Link to comment Share on other sites More sharing options...
starr870 Posted July 17, 2013 Author Report Share Posted July 17, 2013 Changed the plug for a new one today and it started after three kicks, it was a bit rich to start with but cleared after a while. I think it must of been a combination of a duff plug and being flooded after I left the tap on. Won't be doing that again, I did notice fuel coming out of a small brass tube which hangs down below the float bowl, i'll have to get the carb off and have a look at that. Thanks for the replies and help. Andy. Quote Link to comment Share on other sites More sharing options...
boghopper350 Posted July 19, 2013 Report Share Posted July 19, 2013 Glad you got it sorted. :-) Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.