GS850 Carb Upgrade Worth The Time??

[Adler]

Ok here's where the noob in me comes out....What the H is a plug chop?

Technically speaking, its when you take out your spark plug and cut it in half so you can see the color of the ceramic... Nobody does that though, so plug chops are really when you run the engine and then inspect the plug for color to ensure the mixture is correct.

[DanTheMan]

You can get the 34s to work it will just be more trial and error using plug chops.

Over, and over and over again.......

[Octain]

Rejet for the pods and exhaust and the 32's with a tried and tested jet kit from Dynojet and you have all the bike you will ever need.
PLus its EASY!
Bigger is not always better(in this case). If your engine isnt built up enough to burn it you're wasting time better spent riding or working on something else.

[Steve]

Technically speaking, its when you take out your spark plug and cut it in half so you can see the color of the ceramic... Nobody does that though, so plug chops are really when you run the engine and then inspect the plug for color to ensure the mixture is correct.

I heard somebody else allude to the "cut the plug in half" in reference to a "plug chop", but the way I learned it, you run the bike at specific throttle openings for a set period of time, then chop the throttle, pull the clutch and hit the kill switch, then coast to a safe place to pull over and read your plugs.

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[BassCliff]

Greetings and Salutations!!

Hi Mr. pressoneforenglish,

You'll find a lot of this terminology explained on my little website. Let me share some GS lovin'.

I just stopped by to welcome you to the forum in my own, special way.

If there's anything you'd like to know about the Suzuki GS model bikes, and most others actually, you've come to the right place. There's a lot of knowledge and experience here in the community. Come on in and let me say "HOoooowwwDY!"....

Here is your very own magical, mystical, mythical, mind-expanding "mega-welcome". Please take notice of the "Top 10 Common Issues", "Top 15 Tips For GS Happiness", the Carb Rebuild Series, and the Stator Papers. Now let me roll out the welcome mat for you...

Please click here for your mega-welcome, chock full of tips, suggestions, links to vendors, and other information. Then feel free to visit my little BikeCliff website where I've been collecting the wisdom of this generous community. Don't forget, we like pictures! Not you, your bike!

Thanks for joining us. Keep us informed.

Thank you for your indulgence,

BassCliff

[forenglishpressone]

Ok so its just about reading the plugs....You Suzuki guys and your lingo...

Bass- I've been all over your website already like a cheap suit, thanks for putting all that stuff in one pile it's been a huge help getting this POS as far as it is.
I'll have pictures up ASAP

Thanks guys.

[Steve]

Ok so its just about reading the plugs....You Suzuki guys and your lingo...

A quick Google search will show you that it's FAR from being exclusive to "Suzuki guys".

.

[chef1366]

Scroll down the page

http://www.thegsresources.com/_forum/showthread.php?t=154214&highlight=1230&page=13

[7981GS]

I had the 34's on my 850 with 4-into-1 exhaust for many, many years.
It ran frikin' great!
They both fit the same manifolds.
So why would you spend the SAME time/money on the 32's?

Daniel

[Octain]

I had the 34's on my 850 with 4-into-1 exhaust for many, many years.
It ran frikin' great!
They both fit the same manifolds.
So why would you spend the SAME time/money on the 32's?

Daniel

What jet settings did you use?
Ya see, this is key here. Many have jetted(including DJ) the 32's on an 850 with pods and 4 into 1 since this is how they come from the factory. But not so many with the 34's. Which makes the jetting process with the 32's much simpler.

[7981GS]

My memory tells me that the mains were 115's.
No change in pilot jet or needle.
Ran perfect. I was at close to Sea level.

Daniel

[Flyboy]

Daniel, did you not find that you lost a bit of mid range grunt with the 34's?
Normally going bigger will increase the top end nicely due to the better breathing, but you sacrifice mid range for it, and in my mind, that tree stump pulling mid range torque is one of the sweetest traits of the big GS motors.
Just thinking, maybe the 2mm is not that much bigger to make a notable difference.

[7981GS]

As any engine is an air pump, basically...
why increase the breathing at one end and not the other?
You gain more horsepower and torque throughout the ENTIRE power band
so where do you lose any low end grunt?
Are you changing the camshafts???

Daniel

[Flyboy]

No, not at all, stock cams, and I do understand the air pump pricipal, but there is more to it than that, it is about metered flow, as I have always understood it the bigger throat of the carbs will give you less of a vacuum signal, due to less restriction, thus compromising tractability at the lower rpm side of things, as the fuel metered into the motor is dependant on the vacuum drawing it into the motor, so a drop in vac wold constitute a drop in fuel flow.
Conversly a small intake would create a high vacuum situation and a very fast throttle response, but is pretty useless at high rpm due to the limited amount of air in can flow.
Obviously at WOT with the pots going up and down 150 times a second, and sucking in air like there is no tomorrow this does not apply.
Anyway, this has just been my understanding of it, what am I missing here?