Hi Guys,
Wonder if I can ask for your expert advice/help.
I have a 1/5th Yama buggy which I got used 6 months ago but haven't started it up yet. It was stored in the loft with the fuel drained. Last week I topped it up with fresh fuel (oil mix 25:1), charged the batteries and went to start it. I primed the carb and fuel flowed into the bulb and out the return tube as expected. With the choke on I tried starting it and it spluttered a few times but would not start. I switched the choke off and tried again and same it spluttered a few times like it wanted to start but nothing.
I tried a few more times with the choke on and opening the throttle a little bit with my finger - it would start and run for 5-10 seconds then die. I tried again and when it started I would try revving it but when I opened the throttle the engine revs would die and if I closed the throttle quick enough the engine would continue to run roughly but would not rev.
After some more trial and error I could get it to 'idle' roughly by having the choke half open.
I decided to take the carb apart to inspect it and clean it out.
It has a Ruixing carb which looks very similar/clone of a Walbro 813.
Inside there was a few bits of dirt/debris on the wire mesh filter but the rest looked all good - the gaskets & diaphragm look good so I cleaned it with carb cleaner, checked the needle and reassembled.
Now it doesn't start at all - doesn't even make any spluttering like it is trying to start.
1. There are no leaks from carb or air filter/manifold gaskets.
2. The fuel lines are fitted same as before and fuel flows when the primer is pumped and returns to the tank.
3. The tank cap breather is clear.
4. The plug has been cleaned and gives a strong looking spark when tested.
5. There feels to be good compression with the plug out and finger pressed on the hole - finger comes off wet with petrol.
6. A quick spray of easy start down the carb throat and it will start, run at high revs for 3-5 seconds then dies.
7. The screws are set at H:1.5 & L:1.25 which I believe id the factory default.
Ideas and suggestions please.
Many Thanks.
Wonder if I can ask for your expert advice/help.
I have a 1/5th Yama buggy which I got used 6 months ago but haven't started it up yet. It was stored in the loft with the fuel drained. Last week I topped it up with fresh fuel (oil mix 25:1), charged the batteries and went to start it. I primed the carb and fuel flowed into the bulb and out the return tube as expected. With the choke on I tried starting it and it spluttered a few times but would not start. I switched the choke off and tried again and same it spluttered a few times like it wanted to start but nothing.
I tried a few more times with the choke on and opening the throttle a little bit with my finger - it would start and run for 5-10 seconds then die. I tried again and when it started I would try revving it but when I opened the throttle the engine revs would die and if I closed the throttle quick enough the engine would continue to run roughly but would not rev.
After some more trial and error I could get it to 'idle' roughly by having the choke half open.
I decided to take the carb apart to inspect it and clean it out.
It has a Ruixing carb which looks very similar/clone of a Walbro 813.
Inside there was a few bits of dirt/debris on the wire mesh filter but the rest looked all good - the gaskets & diaphragm look good so I cleaned it with carb cleaner, checked the needle and reassembled.
Now it doesn't start at all - doesn't even make any spluttering like it is trying to start.
1. There are no leaks from carb or air filter/manifold gaskets.
2. The fuel lines are fitted same as before and fuel flows when the primer is pumped and returns to the tank.
3. The tank cap breather is clear.
4. The plug has been cleaned and gives a strong looking spark when tested.
5. There feels to be good compression with the plug out and finger pressed on the hole - finger comes off wet with petrol.
6. A quick spray of easy start down the carb throat and it will start, run at high revs for 3-5 seconds then dies.
7. The screws are set at H:1.5 & L:1.25 which I believe id the factory default.
Ideas and suggestions please.
Many Thanks.