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Post by steve8274 on Jun 17, 2014 12:00:07 GMT -5
Took my carbs off today and found a screw missing out of bottom of carb. Luckily it was resting on bottom chassis rail in all the collected dirt:) Put the screw back. Not sure what it does. Maybe a jet. It had a spring with rubber washer on end. Pic below hopefully of its location   Anyone know what it does and how do I know how far to screw in. Have set it in roughly same as others. Will that suffice? |
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Post by weavo56 on Jun 17, 2014 12:25:06 GMT -5
That would be your idle needle sometimes they have a rubber plug over them when set at the factory.
It controls the fuel going in at tick over .
Not used when you are bombing along , very lucky steve .
It is normally set at 1 1/2 to 2 turns out from fully shut , then you fine tune them all to get the correct fuel/air mix and a smooth tick over .
Graham
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Post by steve8274 on Jun 17, 2014 12:35:53 GMT -5
I know. Very lucky. Would that have been making it pop and bang as I was driving tho? As I said to you, there seemed to be no loss of power but just backfired a lot. It was the tickover which sounded like it was running on 3 cylinders.
Everything else seems to move freely and was actually quite clean.
Mine seems to be about 4 screws from fully closed. This is roughly same on all of them. Do I alter all or leave as?
When I took car for mot, tester said it was running rich. Would this be reason? Should I turn them all in?
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Post by weavo56 on Jun 17, 2014 12:55:52 GMT -5
OH yes , 4 turns is a lot and the more you open them the more fuel goes in , also the spring is having a lesser effect at holding the needle in , that is why it worked loose . are any of the others loose ?
With out any test gear you won't know wether your rich or lean on the mixture .
If you look up " setting up bike carbs " there is loads of info , thats what I did .
But they say start at 2 turns , also check that your butterfly's are all set the same , tick over should be with the butterflys shut and its just on the idle jets and the needles .
G
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Post by weavo56 on Jun 17, 2014 12:57:26 GMT -5
But don't screw them in too tight just till it starts to feel tighter or you will damage the needle point .
G
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Post by steve8274 on Jun 17, 2014 13:24:36 GMT -5
Ok thanks. None of others seemed loose but they are all about 4 turns from closed.
The only problem I can see is once the carbs are back on the manifold, then I won't be able to get to these screws since the chassis rail is in the way.
The butterfly valves are all closed and with feeler gauges, they all appear to be same.
Not sure on what to do best. Car was running well and fuel consumption seemed ok. Do I alter these screws to maybe 3 turns so not as rich but run risk of car not running well. Even if I took to a garage, I not sure how they would do it due to access
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Post by weavo56 on Jun 17, 2014 13:28:34 GMT -5
I would try 3 turns , yes give it a go see if it makes a difference .
who did the set up originally ?
G
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Post by weavo56 on Jun 17, 2014 13:30:04 GMT -5
Some times if you have to have the needles that far out it means the idle jets are too small .
G
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Post by steve8274 on Jun 17, 2014 13:34:48 GMT -5
The carbs were rejetted and set up by GBS. Makers of my kit. And as I say, it has alway ran well until last week or so.
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Post by weavo56 on Jun 17, 2014 13:51:43 GMT -5
OK mate , just have a look with google for your carbs and how to set them up .
C U later G
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Post by steve8274 on Jun 20, 2014 16:25:30 GMT -5
Carbs cleaned and put back together and it sounds good again  Maybe still running rich but I can live with that for now. Thanks graham for the advice |
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