Question about 1978 Suzuki GS 750 E

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I have to have full choke when I start bike, warm or cold.I've cleaned carb,s and passages seem clear. I,ve been running bike with air cleaner off, will that make a differance? GS 750 - 1978

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Your engine will **** in an average of almost a teaspoon of dust an hour of running without a airfilter on. this dust wears out the rings in your engine and everything else it touches in your engine. Lower compression and partially clogged jets lower the vaccum that your carbs pull in. Your bike should have a vaccum operated petcock that allows the fuel into your carbs. My guess is that you have low vaccum pressure. You might just need to replace a vaccum line or a petcock. Try pulling off the vaccum line from the front of the second carb and sucking on it until you see the fuel line fill up a little (don't worry, gas doesn't go threw the vaccum line so you won't get a mouth full of gas). Once you see the line about half full of gas or better. Try starting it up without the choke (engine should already be warm). The reason why I think this might be the problem is because when you choke a engine on these carbs, you increase the vaccum in the lines. Let me know if when it is warm, before you start it, if it already has about half of the gas line filled up. Good luck and let me know how it works out.

Posted on Sep 13, 2009

Testimonial: "Thanks for the tip,I'll let you know what happens, I'll need a few days thanks rustycb"

  • onstar37 Sep 18, 2009

    one other thing is that you have a vaccum operated system and it needs little restriction inorder to function properly. My bike was almost completely unable to run when I took its filter off. I had to leave it choked to keep it running.



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2003 CRF150f that I can't get started.

As long as you have spark and compression i would go back to the carb and pull the low speed jet out make sure it is clear and also the passage way its in this is the most common problem if a bike sits for some time the gas tends to gel and the tiny jet will easily clog up make sure its clear or the bike just wot run correctly at all.

Aug 28, 2012 | Honda Motorcycles

1 Answer

The bike wont stay running without the choke pulled out a bit, even after its warmed up. what could be causing this?

It sounds like your bike is running too lean, which is to say that it's not drawing enough gasoline through the carbs to match the air that's coming in through the air intake. Pulling out the choke reduces the amount of air coming in, creating a richer air/fuel mixture.

The most common cause for this problem is that one or more jets have gummed up slightly and so aren't able to pull through the right amount of gasoline. This happens a lot with modern gasoline if the bike has been permitted to sit for a while without being run (I've heard it can happen in only a few weeks; I've experienced it if I let my bike set 2-3 months). The idle jets that use use when you first start the bike or when the bike is just, well, idling, have the smallest diameters and are most prone to clogging.

The comprehensive solution to this problem would be to pull the carbs and completely clean them out. The whole bike will run better after you do that. The faster solution would be to clean only the idle jets, which occasionally can be removed from a carburetor while it's still in place on the bike. You might be able to do that for the two outer carbs on your bike, but I question whether you'd be able to do that with the inner 2 carbs.

Cleaning the jets themselves is the easiest part of the process--getting to them is the problem. The jets are made of soft brass, so you can use a a toothpick and/or a piece of very thin copper wire (it's softer than brass) to clear the jets. Simply using compressed air and/or carb cleaner is unlikely to get the crud out, though you can use all of these things together to get the job done. I sometimes soak the jet with cleaner, then poke it clear, then blow some air through it to get out any residual particles.

Pulling and reinstalling the carbs may require them to be re-synchronized. This, too, would make your bike idle and run better. However, if all you've done is remove, clear, and reinstall the idle jets, you may not have to synchronize the carbs, as you've done nothing to change their present settings.

Good luck!

Sep 11, 2011 | 1980 Suzuki Gs 550 L

2 Answers

After my bike warms up good it gets real sluggish. It takes about 15 minutes for this to occur. When it happens I have to rev the bike real high or it will die out like its not getting or getting to much...

You didn't say what year or model your bike was but if it runs better when it's cold than it does when it's hot, this is an indication that it's running rich. Does the bike start up and idle without the use of the choke or very little use of the choke? If so, another indication that it's rich. Take the air filter cover and element off, leave the backing plate on, and take the bike for a ride. If it runs better, yet another indicator that it's running too rich. What type of carb is on the bike? This is unusual as most bikes,unless they've been rejetted, are jetted lean and have a nasty habit of spitting back from the carb.


Aug 08, 2011 | Harley Davidson XL 1200 L Sporster Low...

1 Answer

A fterI warm up my 01 rm 250 my bike don't start

Possibly the choke is getting stuck internally, Even thoug the leaver may be in the closed (normal) position, it may be sticking internally. Try removing the choke and cleaning the passage with some carb cleaner, then replace the lever. The bike could run with a partially cloged choke but would be tough to start when warm due to too much fuel. Another thing to check, when it is hard to start, just after kicking it over a few times, remove the spark plug and see if it is wet with gas. My guess is that's it's soaked. Good luck.

Apr 04, 2010 | 2003 Suzuki RM 250

1 Answer

High excelaration when starting bike,also must use choke to turn bike on, if choke is reduced bike will turn off

Your carb or carbs need cleaned. Remove them from the bike and disasemble them completly and make shure all jets and passage ways are free of dirt and grime. Use a good carb cleaner and compressed air.
Readjust float and air/fuel screw should be 1 1/2 turns out from seat.

Nov 24, 2009 | 2004 Yamaha YZ 450 F

2 Answers

This bike is a 2007 and is extremely cold blooded

check for air leak where carb meets intake manifold.air cleaner element must be in good condition and prpoerly seated.

Sep 22, 2009 | Yamaha TT-R 125 L Motorcycles

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1200 bandit choking up under 3000rpm

Sounds the pilot passages and or the needl jet air passages are blocked on the carb for that cylinder that is not fireing. The carb should be removed from the bike and disassembled and dipped in carb cleaner. What I think works best for cleaning carb is Yamaha's Carb Dip I mix it 50/50 with warm water. All the rubber parts must be removed as they will be swell and be damaged by the dip. After you dip the carb will need to verify all passages with spray carb clean to make sure the fluid will make it through the intended passage.

May 25, 2009 | 1999 Suzuki GSF 1200 Bandit S

1 Answer

Wont run /idle

i'd start with removing the carbs and giving them a thorough cleaning as when bikes sit for so long, the carbs begin to get gummy/varnished from the old gas.

check for blocked holes in the pilot jet & main jet and look for "hard & dried up" gas in passages. be careful of the float bowl gasket as to not tear it or you will need a replacement.

Mar 03, 2009 | 1999 kawasaki ZR-7

1 Answer

Suspected problem with choke.

hey apparently and did are two different stories draining the float bowls and cleaning the carbs are two different things the fact that the choke dosent change suggest the carbs are stopped up after sitting for 1 year clean the carbs let them soak in carb cleaner and blow them out with high pressure air, keep notes of the adjustments befor you dissasemble them (air screws)

Jan 09, 2009 | 2001 Suzuki VS 800 Intruder

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