gsx 250 problem

[andington]

hi all..i resently bought a 1980 suzuki gsx 250 that had been stood for a few years.well when i got it home i cleaned the carbs out put some petrol in the tank.when i bump it it starts ok ticking over but as soon as i rev it it cuts out? i thought it was a petrol problem at first but ive double checked the carbs and there not blocked.another thing is the battery is not holding its charge and wont even turn the engine over when i press the start button! all it does is lights the ignition lights up. could it be the battery not giving it enough power to rev? or does anyone no what else it could be? cheers

[DingDong]

I think its a carb problem... things to try
check the chokes not on
Remove and clean the air filter
Make sure there is new fuel and that the fuel runs freely and clean from the tank
Clean the plugs
If all that fails, you'll need to pull your carbs out, check the float levels,needles and clean the jets. If you not sure you can do this find someone who can...
You should also check the diaphram at the top of the carbs, carefully remove and check for holes (dirt is a give away)

This whole process should only take an experienced person 2hr max :yes:

[GROOMER]

I take it you've put new plugs in after it was sitting?
These bikes are VERY prone to fouling plugs, especially when carbs arent quite tuned/balanced properly or they've been sitting.
Do the plugs, flush tank completely, clean jets etc thoroughly, and get a new battery.

[myvice]

You can ues a car battry and jumper leads if you cant get a good bike battry, also the car ones dont go flat too fast when it has hard starting, winding over for too long can overheat your starter so just shortsh bursts are best.
Bikes can be a real bitch when thay dont get full power from a battry or the charging system plays up, so get a multy meter and when the bikes running see how many volts you are getting accros the battary, should be 13.whatever and remain constant thru the rev range.
Other than that its back to your carbs.
Good luck!

[Teflon]

You can ues a car battry and jumper leads if you cant get a good bike battry, also the car ones dont go flat too fast when it has hard starting, winding over for too long can overheat your starter so just shortsh bursts are best.


I advise not to start the car.

[andington]

managed to get it started today and it actually revved up (spluttering) took it for a spin round the block and it seemed to get better once it warmed up. at first it needed the choke to run but now it doesnt once ran for a for abit..still abit splutery tho im thinking now it maybe the mixture? does anyone know how many turns on the screw on each carb from screwed fully in? cheers

[hondacmx450]

get some one with a flow meater to tune them proply or you r just pissing in the wind

[andington]

ok where would i get one of them from? thanks

[FROSTY]

did ya clean the tank out
good chance thers bad gas still in there -try dumpin all the gas and pullin fresh gas in

[Drew]

hi all..i resently bought a 1980 suzuki gsx 250 that had been stood for a few years.well when i got it home i cleaned the carbs out put some petrol in the tank.when i bump it it starts ok ticking over but as soon as i rev it it cuts out? i thought it was a petrol problem at first but ive double checked the carbs and there not blocked.another thing is the battery is not holding its charge and wont even turn the engine over when i press the start button! all it does is lights the ignition lights up. could it be the battery not giving it enough power to rev? or does anyone no what else it could be? cheers
I got some bad news bro. The GSX have got real weak charging systems. As soon as they have a slightly older battery, its curtains for the regulator/rectifier, after that goes, the stater cooks, and you are left with no charging at all.
Also, if the battery was connected the whole time it sat, as soon as you turn it on and give it some juice via jumper cables, good night nurse.
$200 bucks is a real good price to have the stater rewired, $100 for an after market regulator/rectifier, and about $50 for a new battery.
Also, yes, that would cause it to not rev. easy way to see, when its going with the jumper cable off, ease the throtle a touch, and if the neutral light dims, you gettin no charge.
I speek from experience, I've had two 250's and I just had all these probs with a mates 750 that I rebuilt for him.
pm me if you want anymore advise.
hope I'm wrong tho, good luck.

[andington]

ive bought a new battery today and its starting fine now just still abit spluttery when i rev it? now ive looked at the carb and the fuel pipe is conected but there is 2 more tubes for pipes to go on..on the carb would this be anything to do with it?
and yes i have put new plugs in it and drained the old fuel.
i also noticed that the airbox was loose and there was a slight gap between the carbs and the box so it must be gettin to much air :weird:
i think im gonna take it to a bike shop to get the mixture set properly.
1 more thing is theres 2 pipes coming off the tank 1 is the main fuel outlet and the other seems to do nothing? ive blown down it and it seems blocked?

[DingDong]

the second is usually an overflow, it should exit under the bike.

Its hard for anyone to know what the problem is without seeing the bike running, more than likely a simple problem but it could be any of the suggestions above.

The gap between the air box could cause a miss fire... an air leak on the inlet side will make the bike back-fire when decell ans splutter on idle, un ballanced or stick float needles (which is what I think you have) in your carbs will make you bike hard to start, stall, idle at different speeds an inconsistant performance.

Your in the UK so we cant come and have a look... but there must be someone, the old creapy guy down the street might have a clue.

[MSTRS]

2 hoses coming off the fuel tank-tap? 1 will be the fuel to carbs, the other is probably the vacuum tube & will go to somewhere on one of the carbs or to the manifold between carbs & engine. Engine starts on fuel that is in the carby bowls & once it is going, then the vacuum in the manifold? thru the 2nd hose causes the tap to feed fuel to the carbs.