Where did you install the converter? It needs high temperature to function.An air injector may help,in the exhaust manifold.As close to the exhaust ports as possible.A clogged converter will put out a sulpher-rotten egg smell even with gasoline.Install a converter as close to the exhaust manifold as you can reasonably get it. Give your bio a boost with 5% methanol, ethanol,or kero. Work up slowly to a 10% mix only if needed and so on.You are not burning enough of the carbons. Your engine "may" be running to cool.Try the next higher temp thermostat. Do one thing at a time,chart the results. Start with the least expensive option,try a hotter thermostat first. Then try kero,it should mix better than the alcohols. stephen
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