Question about 1991 Suzuki GSF 400 Bandit

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The bike will not take throttle, refuses actually, carbs are clean and in sync, Bike idles perfectly, but when any throttle is given, the engine is restricted to 2k rpms. Stock jetting, and a slip on pipe.

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I think the fuel filter inside the tank is dirty, or the fuel on the float bowl of the carb is low that when you give gas the fuel in the bowl runs out.

Posted on Feb 05, 2011

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Left carb backfiring thru carb after it warm up


The carbs are probably out of sync. Set the carbs so that both slides crack open at exactly the same moment. Next, balance the carbs by disconnecting one spark plug then turning the throttle screw on the runing carb to a slower and slower rpm until the bike stops idling on one cylinder. Now reconnect that plug and disconnect the other. Do the same thing to the point the engine dies trying to run on one cylinder. Now start the bike up with both sparkplugs in place. The idle speed will be high, but now the carbs are in balance. Turn each throttle screw down in equal portions until proper idle speed is attained. It would be a good idea to set the valve lash also. If the backfire continues, chances are the valves need to be re-seated. Re-sync and balance the carbs after the valve re-seating. Please rate my answer. Thanks.

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Idling engine dies with even slight throttle twist.


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I need tuning specs for my 1982 suzuki gs 750.


You need to fix the fueling first - without fuel it won't run!
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Jun 28, 2009 | 1981 Suzuki GS 750 L

1 Answer

No idle falls on face


Sounds like time to clean the carbs.
ALWAYS have a fire extinguisher at hand when working on carburetors.
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 and install the carb. Sync the carbs such that the slides on the carbs move at the same exact instant when the throttle is slowly turned from idle speed. Clean or replace the air filter and install an in-line fuel filter. Let the float bowl fill then start the engine. This process should get you back on the road.


Also, Google " 1978 XS 650 SE " There is a lot of stuff out there for your bike. Go to the site below where you can see a parts diagram for your specific bike. You will select the actual brand, year, model, etc., once you go to the site. Part numbers and prices are also shown. You can order parts from this site. In the event no price is shown on a particular part, the part is not in stock.
www.babbittsonline.com/pages/parts/viewbybrandand/parts.aspx


Top rating for this answer? Thanks!

May 24, 2009 | 1978 Yamaha XS 650 SE

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