You probably need to shift more. The engine wasn't really designed to run well below 3,000 but . . .
First determine if the engine behavior is caused by being too rich or too lean. If it does it more when it is cold it is too lean. If it does it more when it is hot it is too rich. You can control the mixture to some extent below 4,000 rpm with the idle bleed screws. The are in a boss on the bowl side of the carb under an aluminum plug. Drill a small hole in the plug and use a screw to remove the plug. The screw a set at about two turns out from the factory but you can go out as far as 3 1/2 turns.
You can also control mixture below 4,000 rpm by altering the float level.
Chains come in two basic flavors, with o-rings and without o-rings. Don't buy a chain without o-rings, it won't last very long. Also I would not get a chain with a clip style master link. Get the shop to put a rivet style link in or buy a tool and do it yourself.
First determine if the engine behavior is caused by being too rich or too lean. If it does it more when it is cold it is too lean. If it does it more when it is hot it is too rich. You can control the mixture to some extent below 4,000 rpm with the idle bleed screws. The are in a boss on the bowl side of the carb under an aluminum plug. Drill a small hole in the plug and use a screw to remove the plug. The screw a set at about two turns out from the factory but you can go out as far as 3 1/2 turns.
You can also control mixture below 4,000 rpm by altering the float level.
Chains come in two basic flavors, with o-rings and without o-rings. Don't buy a chain without o-rings, it won't last very long. Also I would not get a chain with a clip style master link. Get the shop to put a rivet style link in or buy a tool and do it yourself.
