1999 Honda VT 1100 C Shadow Spirit Logo
Posted on Apr 28, 2009
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Cruises fine for 30 minutes then starts to lose power and backfir

I own a 1995 honda shawdow VT1100 ace and after I cruise for 20-30 minutes I lose power, starts to backfire and forces me to pull over, after it starts to idle again smoothly I can start back out and go for another 3-5 minutes and the cycle repeats itself. If I go into a town and just run around in the first 3-4 gears it seems alright. The bike only has 2,400 miles on it, I bought it last fall with only 1350 miles and since spring I've riden another 350 miles and now this has started.

Thanks for any help yo can give, Jerry

1 Answer

tombones

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  • Master 3,567 Answers
  • Posted on Apr 28, 2009
tombones
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Joined: Mar 11, 2009
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Drain the carburetors. There should be a screw on the lower side of each carb float bowl. Remove the screw then replace it after the fuel drains. Remove the water trap bowl at the bottom of the petcock, (gas valve). Is there any water or trash in the bowl? Drain a cup of gas from the tank. Is there any water or trash in the cup? Dump it, clean it and re-mount it, (not all bikes have a water trap bowl). Turn the gas back on and wait a minute for the carbs to fill with gas. If the bike doesn't start and run properly then shut off the gas and remove the carburetors from the engine.

FOR EACH
carb > Remove the float bowl and clean the entire carb with a spray carb cleaner from the auto parts store. Wear protective goggles to avoid getting spray in your eyes. Spray into all the little airways and fittings in the carb. Remove the idle screw and the air screw on the outside throat of the carb and spray into the screw holes as well.
< < READ CLOSELY > >
Be sure to put these two screws back in the same hole they came out of. IMPORTANT > do not tighten these two adjusters down. Only screw these in until they LIGHTLY seat. Now turn each adjuster one and one half turns outward. Put the rest of the
carb back together, clean the air filter and install the carb. Before putting the slides back in the throat of the carbs, Install an in-line fuel filter. Also, sync the carbs such that the slides on both carbs move at the same exact instant when the gas is slowly increased from idle speed. Let the float bowl fill then start the engine. This process should get you back on the road.

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