Help!!
My savage is running very rich.  Exhaust and exhaust port have a layer of balck soot, as does the plug.  Reving up produces a puff of balck smoke from the exhaust. Starts and ticks over fine.

I have tried:
New plug.
Valve clearence.
Cleaned carb.
Checked vac line with running on prime with the carb vac outlet plugged.
New petrol.

No evidence of carb flooding. Bike has been running fine until it developed a missfire at wide throttle openings (last 1/4).  None of the above has made any difference.

Specs in manual refers to main air jet, although cannot fine this on the drawing.  Could this be blocked?  Where is it?

Any suggestions out there?

Stu

Yes sorry, air filter, although not pristine, is pretty clean.  I have a straight through muffler with a small in-pipe baffle to keep the noise at a level that prevents me continuously being stopped by the police.  The bike is a early model, 1986 I think.  It may well have a 155 main jet but not really sure.  

Many posts suggest that a none-standard exhaust require bigger main jet but this seems at odds with my problem.

Stu

Hi out there

I was going to try a smaller main jet and spoke to the folks at www.nrp-carbs.co.uk who had supplied a new diaphram for my Kawasaki Z400.  They advised that it was more likely to be a worn needle and needle jet.  They suggested  I look carefully for signs of discolouration or wear on the needle, particularly at its rest position with the slide at its lowest point.
On examination, with a magnifying glass, wear was evident.  
To test the theory I lowered the needle with an additional spacer.  This eliminated the smoking exhaust and just about stopped the missfire.
I have ordered a new jet and needle (3 weeks from Japan).  Will keep you posted on outcome.  Note NRP also supply parts to repair your leaking petcock.

Stu