The Rest of the Fuel System

The original carburetor that came with the 750 sport was no longer on the bike, it was replaced by the original owner with twin Mikuni carburetors from a Ducati 900ss.

It appears that the original Weber carburetor was not well suited for the bike and caused the bike to run poorly. For the 1990 year the 750 Sport was considered a parts bin bike and the Ducati factory used a Fiat automobile carburetor.

Since the tank and fuel filters were so dirty I figured that the carburetors were dirty as well. I took the carburetors to a local shop near work and had them rebuild the carburetors.

It took the shop three weeks to rebuild the carburetors.

I installed the carburetors, warmed up the bike and balanced them and took the bike for a ride.

The bike miss-fired at 5000 rpm.

This time I took the bike to the same shop that rebuild the carburetors and asked them to trouble-shoot the bike.

I waited another three weeks.

I went in to see the mechanic, he told me that the air filters were not fitting properly and too much air flow was affecting the fuel air mixture and they could not further trouble shoot the problem.

They also could not re-attach the fuel tank as the bolts used were the incorrect ones.

I rode the bike home with the tank bolts in my pocket.

I came to the conclusion that they did not want to trouble shoot the bike as too many items were not stock. The ignition system was not stock, The carburetors were not stock and the stock air box would not fit.

I came to the conclusion that the only way this bike was going to get fixed is if I did it myself.

I rolled up my sleeves and started in.