[Healeys] carb problem

[Healeyguy]

Jim
BJ8 with HD8 carbs should have 0.125 diameter jets and needles marked UH (standard).  The top step (largest diameter that inserts in the jet) of the needle should be 0.124 inches. Note only 0.001 difference.  If you replaced the needles and they are for the 0.09 or 0.10 diameter jet then you can and will have the overflow problem you describe.  The part of the needle that inserts in the piston is the same size, 0.125 inches. To much gap in the jet will allow the flow of air over the jet/needle orifice to suck up a lot of extra fuel. Learned this one on a Jag Mk2 that had a set of rebuilt HD6 carbs.  Problem was the HD8 diaphragms that had been installed in the carbs with the proper HD6 needles. Only took a couple weeks to figure that one out.  
Aloha
Perry



In a message dated 02/25/08 19:19:15 Hawaiian Standard Time, healeymanjim at hansencc.net writes:
need help.  helped a club member rebuild a set of bj8 carbs that had a lot of 
gunk and corrosion in them.  jets were frozen to the tube and rubber 
disintegrated when we took it apart.  put new kits in and everything looked 
good.  after putting them on we get lots of gas coming out of the manifold 
drains.  kept leaning jets until could not go further but gas still kept 
draining and engine was running rough with lots of smoke.  needle valves are 
working correctly and fuel pump was not changed.  could the kits have had too 
large of jets or would changing to larger needles in the pistons lean it out? 
TIA   hjim 
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