Question about 2004 Honda VT 1100 C2 Shadow Sabre

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Bought bike had open pipes, old owner never had bike adjusted, added baffles for back pressure, runs 85% better, was wondering if it was possible to adjust carbs rather than rejetting?

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  • Patrick Logan Oct 16, 2010

    Power it has, it pops due to unburnt fuel hitting the hot exhaust. I am not mechanically inclined but it seems that less fuel going into the cylinder is what I'd need. That's why I was hoping there was an adjustment that didn't involve rejetting. I may be fighting an uphill battle, it may need to be rejetted.

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In order for your motorcycle to run correctly you will have to put in larger main jets. Most jet kits also come with a set of needles that have a different taper from the stock needles. If you want the power band of your motorcycle to accelerate smoothly and get rid of the flat spot/hesitation when you apply throttle , you should spend the $100 and put in a jet kit.

Posted on Oct 15, 2010

  • David Belcher
    David Belcher Oct 16, 2010

    Sorry , I assumed you were trying to stop a hesitation or flat spot. Adding baffles increases back pressure solving some of the lean conditions caused by the open exhaust. The popping is caused by air leaks in the exhaust system where the muffler pipe goes into the head and possibly where the muffler connects to the head pipe. Try replacing your head inlet pipe o-ring crush gaskets and the exhaust seal between the head pipe and muffler ( if it is a two piece system) to reduce the popping. If you continue to have problems with popping or misfiring next you want to take off and inspect the air cut diaphragms on the side of your carburetors. They turn off fuel going to the carburetors when you decelerate. If they get sticky or develop a pin hole , the air cut diaphragms can cause similar issues with popping or misfiring. Air cuts are located on the side of the carburetors under a flat plate held on by two screws. If new gaskets do not help, inspect the air cut diaphragms.

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