Question about 2003 Honda VT 1100 C2 Shadow Sabre
The carbs are fitted with the emission control stuff
Ok u have better fuel flow with the shortened exhaust you will most likely need to go up a main jet size ur running with too much air in ur mixture running hot and the backfires are when u get to top of ur gear range its starveing it of fuel runing too hot the exhaust is geting super heated and the backfires are as u decelerate right ? thats unburnt fuel hiting ur exhaust and going bang u may even notice flames at exhaust tip the new slightly larger main jet shuld fix this you may have to ajust the main needles up or down to compensate for the jet change asumeing they are adjustable the pilot jet shuld be fine no need to touch anything there
ok so as u running now ur fuel cat emission thing eats petrol and vice versa over fuel a lot the cat will be overwelmed and get eaten by the fuel ur at the other end too much air cat wont be effected but as ur running much hoter then needed your basicly eating your engine from the inside out from the aditional air the new main jet will allow more fuel from the start of midrange to top end u shuld find after this fix the bike will run stronger and faster and cooler from 600 rpm up primerily more at top end
the main jet is the fix as far as i see it but like i say ajusting that to allow more fuel means u also effect midrange to have more fuel more so the more u open the accelorator so you may need to make a minor adjustment positioning ur needles prehaps 1 clip up putting the needle its self a bit closer to the jet thus giving less fuel thats if you have ajustable needles if not u cant ajust midrange but to be honest just that pilot jet shuld put u so close to right u may not even need the midrange ajustment try it 1 size up on all main jets its at the least a big step in the right direction if not a total fix
hope this helps
Posted on Oct 30, 2012
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Posted on Jan 02, 2017
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