Hey everyone got a problem with my brothers bike. He asked me to do some work, fork seals, chain sprockets etc but then decided to tell me it wasn't running properly. It would only run on the choke and wouldn't tick over, as soon as you touched the throttle it would cut out. I drained the carbs and removed them and gave them a quick clean made sure the jets were all clear. Refitted them and couldn't get it running. After leaving it overnight it fired straight up and revved really high for 2 seconds then wouldn't fire again. If you leave it for a period of time it will start or attempt to start for a couple of seconds then nothing. It does turn over and spark fine it's just not getting fuel. The float chambers are full of fuel. Any help much appreciated .
Is it definitely not getting petrol, or could it be an air leak with too much air?
Working with choked air could point to that.
Try starting it then whip a plug out and see if it's wet with petrol, or dry, which will determine whether petrol is getting through or not.
If it's wet then maybe check the carb rubbers for cracks, and make sure they're refitted and seated properly.
More people are born because of alcohol than will ever die from it.
It ran on the choke before the carbs came out now the choke doesn't have any effect. If you leave it for a period of time it will fire straight away and rev to about 6000rpm for two seconds then dies then won't fire again unless you leave it for half hour. Whilst it does run twist the throttle has no effect. Checked over everything again and again and can't see anything out of place or damaged.
Check the air and fuel filters
Rule out the obvious first
Fuel filter replaced and air filter checked.
Is the tank breather hole clear, that could cause fuel starvation?
More people are born because of alcohol than will ever die from it.
Yep all clear. But surely that wouldn't explain why it will run for 2 seconds when it's been left for half hour then not run at all? It's baffling me. I think the carbs are gonna have to come back out
14-11-15, 10:42 PM
(This post was last modified: 14-11-15, 10:43 PM by celticdog.)
(14-11-15, 12:58 PM)darrsi link Wrote: Is it definitely not getting petrol, or could it be an air leak with too much air?
Working with choked air could point to that.
Try starting it then whip a plug out and see if it's wet with petrol, or dry, which will determine whether petrol is getting through or not.
If it's wet then maybe check the carb rubbers for cracks, and make sure they're refitted and seated properly.
It's also worth looking at the position and condition of the fuel switch under the tank and the fuel pump. It the floats have fuel I'd say it's a carb problem. Have you checked to see if your getting fuel in the cylinders?
Treat everything in life the way a dog would- if you can't eat it or foc it, forget it.
So far I've checked that there's fuel going through the filter into the pump. The pump is working as it should. And the float chambers are full I just really don't understand it.
Right had the carbs out again and took the top covers off and removed the diaphragms and needles then removed the float chamber bowls and made sure the jets were all clear. Checked over everything I could see and rebuilt them and fitted them back on the bike. Managed to get it running and without the choke so was mightily relieved. However later on went back out started for a second then died and won't fire. So back to square one.
What did you set the pilot screws to?
Everything is set as it should be according to manual. As it was before I fettled with it.
Is it a foxeye or boxeye?
you didnt get the main jets mixed up with the blanked off jets did you??
they are the same size and shape as the mains.
although it should still run on the choke (enrichment circuit)
try leaving the fuel cap open. This will confirm if you have a breather problem.
Another ex-Fazer rider that is a foccer again
If the carbs are full, fuel starvation sounds unlikely. Have you followed up on Darrsi's suggestion and taken a look at the plugs?
Flooding can be due to dirt, damaged needle valve tips or seats, failure of the o-ring seal around the brass valve body, mis-adjustment of the float arm or leaky floats.
Out of curiosity did you put the fuel pipe from the tank to the fuel filter under or over the frame rail?
It is supposed to go under the rail as going over the rail could cause it to be squashed by the tank limiting the fuel flow.
Hi all sorry for the delay had some unexpected health issues since my last post. Fingers crossed I can get this bloody bike going now. Just been out this evening and turned the bike over. The fuel pump primed straight away But made no attempt to fire. Checked all spark plugs and getting good spark. At a complete loss.
Did you try it with the choke on or off?
