[Healeys] A bit of tuning advice

Bob Spidell bspidell at comcast.net
Tue Jun 29 09:54:52 MDT 2010

Sounds like valve timing is off. You'll need to check the lift of the #1 intake valve at TDC to confirm, one way or another. 


Bob Spidell - San Jose, CA 

After having problems with the poor running of my BN4, I put an electronic 
ignition in the distributer (which was also overhauled) and rebuilt the carbs 
using a carb kit. However, I still can't seem to get any power. 

I am pretty certain that the timing is right (having checked it with a timing 
gun), all the electric connections (plugs, cables, etc.) seem to be sound and 
I cannot identify any specific problems with the carbs (ie leaks around the 
inlet manifold, etc.). 

So I think the trouble is with the setting of the carbs, but I have been up 
and down the adjustment nuts (rich to lean and back again) without any 

The symptoms are ... a smooth idle, smooth but very sluggish pick-up on 
acceleration accompanied by a loud machine-gun type rat-ta-tat-tat! 

Any ideas? 


Paul Leeks 


100/6 BN4 

Customs House, Customs Way, Preston, Lancashire, PR2 2UW 

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