GS1000G - Carb Jetting

[salty_monk]

Link to continuation thread http://www.thegsresources.com/_forum...d.php?t=117397

[salty_monk]

I might take you up on that.... Might need new airbox boots too I guess. I'm going through a crazy month at the moment but I might get to you in October.

Cheers,

Dan

[chef1366]

Bring your bike to me and I'll dip your carbs. Bring an o-ring kit from Mr. Barr. Plus you can get your windshield.\\/

[salty_monk]

Weird huh.... I guess without tearing it down I probably will never know!

I guess I could seafoam it....

Dan

[KEITH KRAUSE]

I'm not sure why your bike needs the mixture screws set to richer than normal settings. Your very first post, where you mentioned what the mechanic did to the carbs, has me wondering why he did those things.
Typically, excessive mixture screw adjustment would be a form of compensation for poor fuel flow or a semi-blocked pilot circuit passage somewhere.

[salty_monk]

Seems we are ok at the minute thanks Keith.
The needles may be rich but certainly not hugely so, with the new K&N inbox they seem about right. When I put the 115's in I think that should be about perfect, maybe a 117.5 because of the ethanol in the fuel here......

More of a question is the pilot circuit, it won't run with less than 3 turns on the screws. Very strange. Anyway, I'll be looking at it all as soon as possible & will give you a shout if I need any help. During normal usage the plugs don't look too bad. Interestingly Nessism who lives local to me also needs 3 turns on his 550! Strange huh?

Dan

[KEITH KRAUSE]

OK. Been away on vacation and I've missed a lot. I thought I read that you had 1/3 to 1/2 throttle position problems besides a too large main jet for a stock bike? If I remember correctly, you had a jet kit (or adjustable needles from Canada) and it seemed they were set too rich. I'll try to help if needed.

[salty_monk]

No more news, running strong with the K&N, just ordered a new tool to make the upside down jet removal a bit easier & I'll give that a go asap, drop the 115's in.

Dan

[KEITH KRAUSE]

Been away on vacation. Any news?

[salty_monk]

Just a quick update, K&N seems to do as expected. Has lost the hint of bog at pull away & seems to run very strong through the needles. Still bogging down on WOT though.

I think I might run it for a week or two & see what happens, it seems to have found some more power. I think I might try doing the upside down bowl removal & fitting the 115's Kent gave me & see what happens.

Be interested in your thoughts on the pilot circuit.....

By the way, how do I check the float bowl levels?

Dan

[salty_monk]

Keith,

Here's an interesting one..... I got a K&N from a fellow GS'er today. I warmed up the bike, pulled the side cover & pulled out the old filter.

Started her up, fine. twist of the throttle - same as with the filter in (no load though...) twist further (on the needles now) it goes COMPLETELY flat, doesn't even want to run. Twist again to WOT it takes off like a rocket

Anyway, I stuck the K&N in & rode around the car park, seems fine. I'll get it on the road later today.

I guess though from this I can say:

1. The pilot circuit is rich (but it won't idle if I wind the screws in further than 3 out) so something must be wrong in that circuit somewhere. Any thoughts on the cause? Float levels? Someone messed with the air screws?

2. The needles are likely fine & if they've been adjusted then it's not by much.

3. The Main Jets are rich as we knew.

Anyway, just a little update. I'm working on a circuit bike or car so I can pull these carbs & open them up!!
Kent sent me a set of stock jets to play with too.

If I put a 4:1 on there & raise the needles up a bit more he & I would be on similar jetting (he has K&N in box & a 4:1 V&H) so that could be my next plan

Dan

[salty_monk]

Ok, just a thought. Thanks!

Dan

[KEITH KRAUSE]

Just thought to mention that my carbs have no pipes on the vent T's. Just the vent T's pointing up. I take it this will not really have any large effect unless they are blocked?

Dan

Off to work so no time for explanations.
The rule is...if you run pods, or modify the air box with significantly large extra holes, remove the float bowl vent lines to avoid various degrees of fuel starvation (fuel starvation from inadequate venting varies a little from bike to bike apparently).
If you have a totally stock air box, leave the vent lines on. I really don't know if removing the lines on a bike with stock intake has any negative effects. If any doubt, get some lines (about 18") on there and route them under the seat as the factory does.
I don't see how no lines on a stock bike could have anything to do with your richness problem, if that's what you're thinking.

[chef1366]

I know the answer but Keith does such a better job in explaining it.

[salty_monk]

?? Would they remove the pipes when doing that then?

Dan