Gs500e - Carburation Probs after cleaning carbs

veeeffarr · Super Spammer Joined: 22 Jul 2004 Karma :

Hi guys,

Just had the carbs off of my GS to give them a good clean, blasted through the mains and pilots on the LEFT and reassembled the unit.

One of the float bowl screws on the right had been rounded off by a previous owner so I had to put the bike back together without cleaning the right, I also couldn't get the needle jet guide out of the left hand carb.

I seated the air mixture screws and backed them out 1 & 7/8 turns.

When I start the bike up, it runs at about 4k on full choke, then when I bring it back down it idles roughly, but when I apply throttle the revs climb a tiny bit then the bike bogs down and dies? Have I set the air mixture wrong?

Cheers,

T

veeeffarr · Super Spammer Joined: 22 Jul 2004 Karma :

Update

I fiddled with the mixture screws and got it idling like shite

I think one of the carb boots isn't on properly, I could see daylight at the carb mouth if I took the air filter out and peeked through the airbox.

Only problem is that the circular clip that goes around the rubbers is at full tightness.

Any suggestions?

T

Paddy Blake · World Chat Champion Joined: 29 Jun 2006 Karma :

You could try a cable tie instead of the clip if you have one.

Paddy.

veeeffarr · Super Spammer Joined: 22 Jul 2004 Karma :

veeeffarr · Super Spammer Joined: 22 Jul 2004 Karma :

Ok got the cable ties and sorted that out.

Using the tip of an interchangeable screwdriver I can sort of adjust the idle screw, but not accurately enough, I need to get a stubby screwdriver I think.

It idles now, but backfires if I pull the throttle back and splutters at about 2-3k, then climbs up the revs.

veeeffarr · Super Spammer Joined: 22 Jul 2004 Karma :

Also if anyone knows an easier way to adjust the mixture screw than using a screwdriver bit please let me know Very Happy

T

SilvaRizla · Spanner Monkey Joined: 30 Apr 2006 Karma :

Check your plugs, there's a guide knocking round somewhere. Definatley does sound like a mixture problem though
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veeeffarr · Super Spammer Joined: 22 Jul 2004 Karma :

SilvaRizla · Spanner Monkey Joined: 30 Apr 2006 Karma :

https://www.bikechatforums.com/viewtopic.php?t=37506&highlight=fuel+air+mixture

Now you'll know!

Covered in oil is too rich, brown deposits is too lean
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I'm Ivan Dobski the Meatsafe Murderer only I never done it, I only said that I done it so they'd take the truncheon out of my bottom

veeeffarr · Super Spammer Joined: 22 Jul 2004 Karma :

hmmmnz · Super Spammer Joined: 22 Aug 2006 Karma :

the carbs are a bastard to get in right, if there is an air gap, she will back fire and crap,
loosen all the screws off and try and wobble the carbs in properly, use wd40 to make the carbs slippery so they go in easier once you think that you have got it start the bike and spray wd40 athe the carb boots, if the revs change, then you still have an air leak.

to adjust the mixture screw on the fly, get a screw drive bit that you would use in a drill,
https://66.77.255.87/Images/BOSCHCATHERO/SCREWDRIVER2_CAT_HERO/CAT_HERO/SCREWDRIVERBITS_CAT_HERO.jpg

thats what i use and they are sweet as, just put a wee mark on one of the edges so you know when you have done a complete turn
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veeeffarr · Super Spammer Joined: 22 Jul 2004 Karma :

Method · World Chat Champion Joined: 02 Nov 2004 Karma :

I had that problem with mine last summer,

I just fitted an oversized race exhaust to it and blamed the popping on that.

Thumbs Up

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veeeffarr · Super Spammer Joined: 22 Jul 2004 Karma :

The bogging down issue is fixed.

A hose had come loose at the petcock (The one that attaches to the grey pipe that sticks out from it)

But still when I rev it it holds at about 4k and then SLOWLY climbs down to idle... I have no idea what's happening there Sad

T

hmmmnz · Super Spammer Joined: 22 Aug 2006 Karma :

no 2 turns out. or rather just under 2 turns out
when the revs hang it means its running rich,
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veeeffarr · Super Spammer Joined: 22 Jul 2004 Karma :

hmmmnz · Super Spammer Joined: 22 Aug 2006 Karma :

pop and fart when lean Very Happy

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the humans are dead
I kick arse for the lord
Wiring Diagrams BIDNIP it bitches

veeeffarr · Super Spammer Joined: 22 Jul 2004 Karma :

stinkwheel · Bovine Proctologist Joined: 12 Jul 2004 Karma :

Haven't got an air leak at the inlet manifold have you?

Get it idling then spray WD40 or EZ* start over the inlet manifold area. If the revs increase, you have an air leak and it'll never run right.

*Remember, highly flammable so keep it away from the header pipes.
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veeeffarr · Super Spammer Joined: 22 Jul 2004 Karma :

SilvaRizla · Spanner Monkey Joined: 30 Apr 2006 Karma :

The new bogging down still sounds like a mixture problem as it can't maintain the current rate of firing, the more revs you do the worse the gap between correct and lean/rich. Get those plugs out mate and adjust accordingly.

Do the plugs seperatley (take one out and do that carb first) its better to get the mixture right for each rather than adjust each screw the same amount if you know what I mean. It could be that you're running rich on one and lean on the other or something.
____________________
I'm Ivan Dobski the Meatsafe Murderer only I never done it, I only said that I done it so they'd take the truncheon out of my bottom

SilvaRizla · Spanner Monkey Joined: 30 Apr 2006 Karma :

further thought, are you firing on all cylinders?
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I'm Ivan Dobski the Meatsafe Murderer only I never done it, I only said that I done it so they'd take the truncheon out of my bottom

veeeffarr · Super Spammer Joined: 22 Jul 2004 Karma :

hmmmnz · Super Spammer Joined: 22 Aug 2006 Karma :

put it back to standard 1 7/8 complete (360') turns out, then take it to the bike shop and get them to balance it for you, a little lean down low isn't going to hurt it,
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SilvaRizla · Spanner Monkey Joined: 30 Apr 2006 Karma :

Yeah I'd take it the garage. Is the accelerator cable ok? Could be that its sticking and then not returning at the proper rate after you've disconnected it. Other than that I don't know what to suggest.

Does it rev further than 4000?
____________________
I'm Ivan Dobski the Meatsafe Murderer only I never done it, I only said that I done it so they'd take the truncheon out of my bottom