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Post by svint1 on May 11, 2022 6:10:28 GMT
If you flip the carb upside down, does the float lay parallel to the float bowl gasket surface like this?  Does the float move freely to this position when flipped over?  Yes, the float is paralel when carb is flipped over and opens freely when in normal upright position |
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Post by GeorgeS on May 13, 2022 6:54:42 GMT
With the carb fully assembled and off the bike, fit some tube to the fuel inlet.
Can you blow air through the tube when the abr is upright? Turn the carb upside down and confirm you can't blow air to verify the float has moved. Repeat the process the right way up to check float has dropped.
Recently I had a carb in a lammy which had a float that was fouling the body, it was either stuck open or closed.
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Post by svint1 on May 14, 2022 13:31:44 GMT
With the carb fully assembled and off the bike, fit some tube to the fuel inlet. Can you blow air through the tube when the abr is upright? Turn the carb upside down and confirm you can't blow air to verify the float has moved. Repeat the process the right way up to check float has dropped. Recently I had a carb in a lammy which had a float that was fouling the body, it was either stuck open or closed. Can blow in air when it is upright. -and not when it is upside down. So float and needle works as should. But the amount of air able to blow seems little… Even with thoroughly cleaned with carb/jet-cleaned and alot of air from the compressor. |
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Post by nickj on May 24, 2022 8:14:40 GMT
Dumb suggestion but have you got the right float needle?
Sometimes I’ve just given up and bought a new carb…..
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Post by svint1 on May 29, 2022 13:31:40 GMT
Dumb suggestion but have you got the right float needle? Sometimes I’ve just given up and bought a new carb….. No such thing as dumb suggestions at this stage! 😂 Yes, it’s the right needle. I’ve tried a brand new carb as well, and still the same issue. |
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Post by vinrouge on May 29, 2022 19:24:53 GMT
I’m thinking that if it’s not the carb, then maybe the fuel tap for what ever reason is causing an airlock or something
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Post by tzsteve on May 30, 2022 9:20:12 GMT
I know it sounds dilly but have you run it with the filler cap open
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Post by svint1 on Jun 2, 2022 11:06:09 GMT
I’m thinking that if it’s not the carb, then maybe the fuel tap for what ever reason is causing an airlock or something Tried two differen ones, and the result is the same. |
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Post by svint1 on Jun 2, 2022 11:06:35 GMT
I know it sounds dilly but have you run it with the filler cap open Yes, tried that, and the result is the same. |
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Post by tzsteve on Jun 2, 2022 13:13:36 GMT
Frustrating, you seem to have replaced or tested everything
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Yoshi
100 Sport
Posts: 75 
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Post by Yoshi on Jun 3, 2022 4:26:07 GMT
Could you take a video of how the engine behaves?
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Post by svint1 on Jun 3, 2022 7:24:11 GMT
Could you take a video of how the engine behaves? A bit hard to do now, as I'm awaiting parts. -new fuel tap (3rd) Also fitting a new bearing for piston (not related to the issue) But the main thing is that it fills up nicely to just above fuel bowl level and revs nicely and runs nice, but when the fuel level in the bowl sinks, I need to use the choke to make it run properly.... |
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Post by tzsteve on Jun 3, 2022 9:55:30 GMT
As you have run it with the filler cap open and the tank is not full of rust there are Only 3 possible things remaining, tap not working, fuel pipe twisted or kinked, float issue.
You'll kick yourself once you find the problem
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Post by svint1 on Jun 4, 2022 8:41:12 GMT
As you have run it with the filler cap open and the tank is not full of rust there are Only 3 possible things remaining, tap not working, fuel pipe twisted or kinked, float issue. You'll kick yourself once you find the problem He he, I’m already kicking myself. -without knowing the solution… Tried two different fuel taps. -both the same result Tried various fuel pipes and length and 100% sure not kinked/twisted. -same result Tried two different carbs. -same result. Waiting for yet another fuel tap to test, but I’m running out of options… |
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Post by vinrouge on Jun 4, 2022 11:47:41 GMT
Are you using anything like an in-line fuel filter or a quick release fuel line connector, trying a different make of fuel tapii. Does the fuel tap have a reserve, have you tried running on the reserve
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Post by svint1 on Jun 4, 2022 15:50:56 GMT
Are you using anything like an in-line fuel filter or a quick release fuel line connector, trying a different make of fuel tapii. Does the fuel tap have a reserve, have you tried running on the reserve No filter, no quick release… Tried different fuel taps, both with and without reserve. -same result with all… |
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Post by vinrouge on Jun 5, 2022 18:52:31 GMT
Reading through the post again, you've either tested, checked or replaced all items from the tank to the carb. Is it time to start looking at things it can't possible be, is the carb mounted at an angle so the needle gets stuck, try tapping on the float bowl to free it. Does the fuel pipe have a narrow internal diameter. Air leak at the manifold etc., no felt ring on the manifold, piston on the wrong way round.
Is the engine running lean at this time, spark plug colour, engine still running after switching off
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Post by tzsteve on Jun 6, 2022 8:46:46 GMT
Not all problems can be solved over the net,
It is time to let a buddy have a hands on look at this even if you have more experience than your buddy.
a second set of eyes could be what you need at this point
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Post by svint1 on Jun 6, 2022 18:23:43 GMT
Thanks for tips guys, but I’m the only one within a 300km range riding smallframe…
That said, I started to look at the engine itself a few days ago, and when I removed the cylinder cover, I found a massive leak.
-apperantly the head is severely warped, so a new is arriving tomorrow…
Hopefully that be the reason for need for choke, but the fuel issue is still present…
So I’m going to pre-fill the fuel line prior to connectiong it to the fuel tank and hope that does the work.
I’ll let you know.
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Post by tzsteve on Jun 7, 2022 15:14:27 GMT
A duff head can cause many problems, on a standard motor the noise is normally a give away
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