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Post by trickbitspaul on Aug 9, 2015 13:10:09 GMT
Can anyone help with my petrol leak on my px?? I have changed gaskets and even tried new carb but still it's leaking petrol, can't work out if it's coming out of air mixture screw hole or under carb box, if not both. Ive tightened up all screws so it not that either. Please help!!
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Post by vespasco on Aug 9, 2015 18:16:59 GMT
Did you also replace the gasket under the carb box
If youve bought a new carb we can assume that s ok
Maybe its the carb box
Lap everything
New gaskets
Apply a very thin smear of grease on the gaskets
Torque everything correctly
If that doesnt solve it its likely coming from elsewhere... Start from the carb top.
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Post by trickbitspaul on Aug 10, 2015 9:13:15 GMT
Thanks for reply, yes I used a new gasket under the box. What do you mean by lap everything ? Torque is all correct, I was thinking of maybe using two gaskets under box to see if that helps. I will go and put a smear of grease on the gasket!!
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Post by vespasco on Aug 10, 2015 15:45:58 GMT
By lapping i mean sanding/grinding the flat gasket surfaces at the bottom of the carb and the bottom of the carb box....to ensure they are perfectly flat.
If over torqued these can warp causing similar symptoms
To 'lap' a carb youd need a clean piece of glass to use as a flat surface to work on
And also either some wet paste, around 320 grit or finer seems to be ok.
Or some fine grinding paste
I use a marker pen to 'colour in' the gasket face of the carb
In a figure of 8 motion i would then sand/grind down the bottom of the carb andnhave a look for any high/low spots/signs of warping.
Keep going until its perfectly flat
It doesnt actually take too long
Do the same to the bottom of the air box
Clean it all up
Thinly smear the whole gasket with a little grease
Torque down a little at a time, alternating between the two bolts/nutsnuts, until you reach 16 - 20 Nm
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Stovie
2nd Class Ticket
...living the dream since twenty 13!
Posts: 32 
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Post by Stovie on Aug 10, 2015 23:07:33 GMT
Guessing you have changed all the carb gaskets. One of the girls in our club had an issue like this on a run once, it was the gasket for the float chamber that was gone, took us a bit to discover, and took a couple of gasket chanes to resolve. Petrol was coming out the back of the carb.
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