Have cobra pipes on bike. I do not know if the carb was rejetted for these but am guessing I am running lean due to blueing on the pipes and always needing choke to start bike. About 3 years ago bike ran rough and high idle circuit in carbs seemed clogged "bike bogged down with more than 1/2 throttle". I ran seafoam through the tank and seemed to fix. Fast forward to now.... Bike always needs choke to start and fuel economy is horrible. I seem to get about 32mpg if I'm lucky. I'm a little fast on throttle but I shouldn't lose that much MPG. Bike also seems kinda quiet for having Cobra pipes. I just replaced the spark plugs with copper core and gapped them correctly and am wondering if a new air filter would help. I am looking at the K & N air filter or if I need to have my carbs rejetted or cleaned. Thanks for the help.
I have a 2007 Honda Shadow Sabre VT1100 and I also put after market pipes on it from Vance and Hines. I also have to keep it choked when first starting and sometimes even hold the throttle a bit while it warms up. The bike has two carburetors and the best solution I have found by lots of asking around of mechanics and bike folk is to get it rejetted through Dyno Jet. It is meant for bikes with after market exhausts and much less back pressure from the lack of those stiffling baffles in the stock pipes. I have also noticed the power loss in the middle torque range and backfiring because of the bike running in a lean condition. The Dyno Jet website is a good place to find the correct set and corresponding part number, but then I suggest finding a cheap place online so you avoid retail price :) Hope this helps. Oh, and don't forget to buy two kits...we have two carburators in our bikes.
SOURCE: how to change sparkplugs on honda shadow motorcycle
VT1100 has two spark plugs per cylinder, the sparkplug caps are snap-ons so they're fairly easy to remove. You need a spark plug socket wrench to remove and replace the spark plugs.
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