Question about 2000 Yamaha YZF-R6

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Clean Carbs Is there any stuff on the market that can clean my carbs without having to take them off?

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Internally or externally? If you mean inside then you can use lucas, shevron techron, or deep creep (from sea foam). It is slow working but it will clean the inside of your fuel system. If you have some type of blockage then you may need to pull the carbuator off.

Posted on May 13, 2009


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It backfires when i slow down and it wont idle when it is warm

1. vacuum leaks at the back side of the carb spigots or other vacuum lines off/broken. Remove the carbs and spigots from the head and clean with acetone/laquer thinner afterward sealing the spigots to the head with gasket maker/silicone rtv.
2. Carb idle and low speed jets may be plugged up and carbs need a correct cleaning.
3. Carbs need rejetting to match the after market mufflers. Take it to a shop with a motorcycle chassis dyno and they will be able to tune the after market pipes.

Jan 22, 2013 | 1991 Suzuki GSX 600 F (Katana)

2 Answers

#3&4 cyl. Have spark and fuel but air idle screws don't do anything. When warming up backfired out exhaust and carbs

Check the valve lash-sounds like valves are tight in those cylinders. Idle air screws won't do anything if the valves are tight, the motor doesn't develop vacuum when the cylinder doesn't seal. And without vacuum, carbs don't work. If the valve lash is within specs, run a compression test, most "rockets" run a minimum PSI of 150 to be within spec. Good luck!

Jun 11, 2011 | Suzuki GV 1400 Cavalcade LXE Motorcycles

1 Answer

Why does my suzuki gs 450 l leaking gas from the carbs over flow as soon as i start it ?

The fuel petcock for your gas tank has a vacuum bladder in it. If there's no engine vacuum, fuel is supposed to stop flowing out of the tank, preventing carb overflow and accidental draining of the tank. However, once the engine starts, fresh gasoline will begin to flow out of the tank into the carbs. I believe but am not certain anymore that the vacuum cutoff mechanism is disabled when you turn your fuel petcock to "prime" or "reserve." If that is correct, you should be able to duplicate the carb overflow with the petcock in one of these positions.

As for the specific cause, it sounds like one or both of your carb floats may be sticking in position, preventing the fuel shut-off needle from seating correctly. This can easily happen if you haven't ridden the bike for a while--the most volatile compounds in the gas in your carbs will evaporate, leaving behind an increasingly gummy and sticky substance that will eventually harden into varnish if it's not cleaned out. That gummy stuff seizes up the pivot points for the carb floats, so they don't move correctly. Gummy gasoline residue can also build up over time, even if you ride the bike often, though this usually happens after the bike has been sitting. The fix for this is to clean out your carbs. On an early (1982) GS450, I was able to do this once by removing the carb bowl without removing the carbs from the motorcycle and spraying the float pivot points with a heavy-duty gum cutter (Berkebile 2+2--it's like carb cleaner on steroids, but it will also damage paint).

By the way, if I remember correctly, your carbs have a crossover tube to ensure that both carbs have the same gasoline level in them. This keeps the fuel mixture even for both cylinders and keeps the engine running smoothly. However, that also means that a single carb with a stuck float will flood both carbs equally.

May 28, 2011 | Suzuki GS 400 E Motorcycles

1 Answer

Carb re-jet

I would rejet the carbs. I would go one size up on the jets. That should clear up the problem.

May 07, 2010 | 2000 kawasaki Zephyr 750 RS

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Just looking for a mechanics manual to clean out the carburator. for some reason if it sits for a week or two it clogs up. Have taken it to the shop twice and been charged $270 each time for a carb...

The biggest thing you should do is find out why the carbs keep getting clogs in them. Most likely, there is some type of residue in the fuel tank. That must be checked first before you spend any more money on cleaning the carbs.
After cleaning the tank, cleaning the float bowls is simple. Just remove the four screws holding the float bowls on and the float bowl will be free. Clean any residue from the bowls then run fuel through the lines to purge the 'bad' stuff from them before reinstalling the bowls.

Oct 27, 2009 | 1999 Suzuki VZ 800 Marauder

2 Answers

My honda 2hp outboard won't rev fully without half choke.

Yep, the carb (only one) needs to be cleaned. Do not dip in acid. The carb has a special coating on the outside that will be damaged if dipped. It should be cleaned in an ultra sonic cleaner. If that is not avaiable, general a non corrosive solvent sprayed through the various passages ( like brake clean) can get you going. Use compressed air when finished (a can a compressed air used to clean computers works good for little carbs)
Good luck!

Apr 20, 2009 | Sport & Outdoor - Others

1 Answer

This bike in a gray import from the US it is a midnight silverrado xv1700 and it run,s not well do i need to change the jet,s and have the timeing re-maped for the UK

First thing > install a new set of the stock NGK spark plugs for your bike. Clean or replace the air filter. Go ahead and drain the carbs. There should be a screw on the lower side of each carb float bowl. Remove the screw then replace it after the fuel drains. 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 both
carbs > 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 two screws on the outside throat of the carb and spray into the screw holes as well.

Be sure to put these two screws back in the same hole they came out of. IMPORTANT > do not tighten these two screws down. Only screw these in until they LIGHTLY seat. Now turn each screw one and one half turns outward. Put the rest of the
carb back together. Remount the carbs.

Remove the water trap bowl at the bottom of the petcock, (gas valve). Any water or trash in the bowl? Drain a cup of gas from the tank. 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. Be sure to balance and sync the carbs when finished. If you don't know how to balance and sync the carbs, get back to me after you do the stuff mentioned above. This process should get you back on the road.

Mar 30, 2009 | 2005 Yamaha Road Star Midnight Silverado

2 Answers

Rebuilt carbs-starts and idles but wont rev up without choke on

sounds like the main jets are partly pluged, you must remve all brass jets and seats including needle jet and its slide soak in carb cleaner and blow out with compressed air only.. hold up to bright light to verify if all are clean. jim

Mar 29, 2009 | 1984 Suzuki GS 700 ES

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