chris sutton 610 #1 Posted March 22, 2018 Its been running well the last few days and ive been driving it around, Started it this morning and after a couple of minutes it started running rich. I switched it off and found No2 plug black with soot. changed the plug and it wouldn't start, checked both plugs sparking, tipped fuel down plug hole and carb and still no go, After a cuppa and a battery recharge it started but started to run rough with-in a couple minutes with black smoke from exhaust and then stopped when I moved the throttle to idle. Any thought's guys ? 1 Share this post Link to post Share on other sites
Stormin 9,983 #2 Posted March 22, 2018 Sticking float needle, Chris? Carb flooding? 1 1 Share this post Link to post Share on other sites
chris sutton 610 #3 Posted March 22, 2018 29 minutes ago, Stormin said: Sticking float needle, Chris? Carb flooding? I'll take the carb off tomorrow and check that Norm Share this post Link to post Share on other sites
953 nut 57,871 #4 Posted March 22, 2018 If you have been running ethanol gas there is probably crud building up in the fuel system. After rebuilding the carb you should replace the fuel line and filter and run some Seafoam too. 2 Share this post Link to post Share on other sites
oldredrider 2,553 #5 Posted March 22, 2018 Also check the float for holes... 2 Share this post Link to post Share on other sites
chris sutton 610 #6 Posted March 22, 2018 50 minutes ago, 953 nut said: If you have been running ethanol gas there is probably crud building up in the fuel system. After rebuilding the carb you should replace the fuel line and filter and run some Seafoam too. Ive cleaned the fuel tank and replaced all the fuel lines and filter 1 Share this post Link to post Share on other sites
chris sutton 610 #8 Posted March 22, 2018 8 minutes ago, bitten said: Coil? I did wonder about that but the plugs seem to be sparking Share this post Link to post Share on other sites
bitten 134 #9 Posted March 22, 2018 Just the first thing I thought of. I have seen spark without running changed the coil and running. The first thing I would do is clean the carb like you have planned. Hopefully that takes care of it. Check your points for cleanliness and proper gap. Good Luck with it. 1 1 Share this post Link to post Share on other sites
chris sutton 610 #10 Posted March 23, 2018 Just had another look this morning, first thing i did was to turn the fuel tap off. It started straight away and ran sweet on the fuel that was in the system and as it started to miss i gave it a swirt of fuel with a bottle and it plcked up and ran on both cylinders. I then turned the tap on and it started to miss with black smoke from the exhaust untill it chocked and stopped, then it wouldn't start. Next job is to remove the carb and have a look at the needle valve, it must be jammed open and dumping loads of fuel in the engine 2 Share this post Link to post Share on other sites
953 nut 57,871 #11 Posted March 23, 2018 5 hours ago, chris sutton said: remove the carb and have a look at the needle valve, it must be jammed open and dumping loads of fuel Sounds like you have narrowed it down to a single culprit, quick inexpensive fix too. 2 Share this post Link to post Share on other sites
chris sutton 610 #12 Posted March 23, 2018 Had a look in my box of carb parts and found a new needle and seat and the gaskits. All back together now and ready to fit in the morning 3 Share this post Link to post Share on other sites
squonk 42,516 #13 Posted March 23, 2018 Is that in your kitchen Chris? 1 1 Share this post Link to post Share on other sites
chris sutton 610 #14 Posted March 23, 2018 4 minutes ago, squonk said: Is that in your kitchen Chris? Yes Mike, on the dinning room table. 1 1 Share this post Link to post Share on other sites
953 nut 57,871 #15 Posted March 23, 2018 Did you boil the carb out on the kitchen stove? 1 2 Share this post Link to post Share on other sites
stevasaurus 23,063 #16 Posted March 23, 2018 Sounds like you got it by the short hair Chris. 1 1 Share this post Link to post Share on other sites
chris sutton 610 #17 Posted March 23, 2018 2 minutes ago, 953 nut said: Did you boil the carb out on the kitchen stove? I was going to pop it in the Ultrasonic cleaner but its really clean inside so I didn't bother 1 Share this post Link to post Share on other sites
squonk 42,516 #18 Posted March 23, 2018 I'd be more inclined to use a salad shooter but that's just me! 1 2 Share this post Link to post Share on other sites
classiccat 548 #19 Posted March 23, 2018 Did you give the float a shake when you had it apart? Share this post Link to post Share on other sites
chris sutton 610 #20 Posted March 24, 2018 14 hours ago, classiccat said: Did you give the float a shake when you had it apart? Yes, first thing i checked. all looking good and quite clean. 1 Share this post Link to post Share on other sites
chris sutton 610 #21 Posted March 24, 2018 (edited) Carb all refitted now and a new manifold gaskit. It took a bit of encouragement to get it going but once running and tuned in it runs real sweet. Had it running for half an hour with no missfires or smoke so I'm pleased with that and its restarts easy. Edited March 24, 2018 by chris sutton 2 Share this post Link to post Share on other sites
953 nut 57,871 #22 Posted March 24, 2018 5 hours ago, chris sutton said: It took a bit of encouragement to get it going The fuel pump being on the top of the engine and tank under the seat was never a good idea to me. I have an electric fuel pump mounted low on the frame and it starts much better now. 1 Share this post Link to post Share on other sites
squonk 42,516 #23 Posted March 24, 2018 6 hours ago, chris sutton said: Carb all refitted now and a new manifold gaskit. It took a bit of encouragement to get it going but once running and tuned in it runs real sweet. Had it running for half an hour with no missfires or smoke so I'm pleased with that and its restarts easy. Hope you started it outside! 1 1 Share this post Link to post Share on other sites
chris sutton 610 #24 Posted March 24, 2018 1 hour ago, squonk said: Hope you started it outside! Nothing wrong with having a in the dinning room Mike. 2 1 Share this post Link to post Share on other sites
squonk 42,516 #25 Posted March 24, 2018 That's awesome! If I tried that , no one would ever see me again and the body would never be found! 1 3 Share this post Link to post Share on other sites
