Guesstimates for future baseline jetting?

[Guest]

I have no idea of carb setup for the future engine setup. Its a 1983 GS1100E that will have a ported, stock valve sized 1100 head, 1166cc, more than likely Webcam 340 (?). What's the best all-around timing for the cams? The biggest drawback is that it has to have the stock GS air box and a set of 1985 GS1150 exhaust pipes. The head and carbs are a done deal so its from there on. Is it worthwhile to put the 1150's valve into the 1100 head? Complete waste of time? There's gotta be some benefit somewhere? One fellow mentioned that the biggest hindrance is the stock airbox, but it can be improved (?). Anyway with such a build, where would one start with jetting and needles and others?

Any and all replays welcomed.

 

[posplayr]

I have no idea of carb setup for the future engine setup. Its a 1983 GS1100E that will have a ported, stock valve sized 1100 head, 1166cc, more than likely Webcam 340 (?). What's the best all-around timing for the cams? The biggest drawback is that it has to have the stock GS air box and a set of 1985 GS1150 exhaust pipes. The head and carbs are a done deal so its from there on. Is it worthwhile to put the 1150's valve into the 1100 head? Complete waste of time? There's gotta be some benefit somewhere? One fellow mentioned that the biggest hindrance is the stock airbox, but it can be improved (?). Anyway with such a build, where would one start with jetting and needles and others?

Any and all replays welcomed.

I put the 1150 valves(28mm intake v.s. 27mm) into my 1100 head and it does provide for noticeably improved flow compared to stock valves.

Not sure what you are trying to achieve with the mix. The standard settings for the 340 webcams are a good place to be for improved mid range.

What carbs are you going to use. The 36mm 1150 CV's are good. The jetting will need to be stepped up quite a bit from stock to account for the 1166 but more so to account for pods and pipe depending upon what you select. If you stick with stock airbox, are you going to go to a lower restriction air filter.

I think stock 1150 is Mikuni 122 with the 36mm , you probably dont need to change the stock needles with airbox and stock exhaust. 130 main would be a good place to start, maybe a little rich but plan on some where between 125-130.

More info on head work here

http://www.thegsresources.com/_forum/showthread.php?t=137631&highlight=high+performance+head

 

[Guest]

I do have a set of stock jetted 1150 carbs on hand (coming). And the ported 1100 head. The cams and pistons I don't have yet. But the stock 1150 pipes and stock visible part of the air box have to remain. Yes I know a lot of power is tossed out the window with the box and pipes, but that's part of the issue I have no idea of what effects it has on the jetting requirements.

*EDIT* are the top end oilers needed with the the 340's? Seems like many varying opinions on the topic.

 

[posplayr]

I do have a set of stock jetted 1150 carbs on hand. And the ported 1100 head. The cams and pistons I don't have yet. But the stock 1150 pipes and stock visible part of the air box have to remain. Yes I know a lot of power is tossed out the window with the box and pipes, but that's part of the issue I have no idea of what effects it has on the jetting requirements.

An 1166 with some head work, 340 cams, stock airbox and pipes will need to breath just a little more fuel than a stock 1150.

the 1150 mains are 120 (1&4) and 122.5 (3&4).

I have everything you plan on but have a 4:2:1/pods which is closer to a stock pipe as far as mid range as compared to the 4:1 and I am well tuned at 135 main.
That is why I suggest you will not need over a 130 main (and a 130 would only be with a free flowing filter in the box and the top off).
You will need to be in the 125-130 range more than likely.

 

[posplayr]

*EDIT* are the top end oilers needed with the the 340's? Seems like many varying opinions on the topic.

Exhaust cams have chronically low oil pressure, they are also the ones that get the hottest. You decide how many times you want to buy $400 cams.

 

[posplayr]

http://www.thegsresources.com/_forum/showthread.php?t=164565&highlight=AFR

Edit 5/20/2012
Bike is GS1100ED 1166, ported head, K&N pods, 36mm BS36, GSXR 4:2:1 Yoshi, 0.340 Webcams, Accel coils, coil mod ​

The final jet setting I arrived at are as follows. You can compare this with the various descriptions

Exhaust____4:1__________4:2:1
Type
Main jet_____140__________ 135
DJ needle__3 or higher_______ 2
Pilot jet_____47.5___________45
Pilot Air____stock?________stock?

A more normal jetting would probably be a 140 main (v.s. my 135) with the needle jet at 3 or higher (v.s .mine at 2). I'm attributing the leaner main and fatter needle setting to my 4:2:1 v.s. the more traditional 4:1. The 4:2:1 flows better at mid range but not quite the flow at the top end as compared to the 4:1.

http://www.thegsresources.com/_forum...3&postcount=12

 

[rapidray]

Why all you are doing but stock pipes & airbox?!!! Makes NO sense. Ray.

 

[blowerbike]

Why all you are doing but stock pipes & airbox?!!! Makes NO sense. Ray.

what ray said!

 

[posplayr]

I'm sure who the owner is wants to keep the stock look.

headsbikesmopars (stock airbox/pipes) with built/ported motor but he also had RS Flatslides and would spin rubber on a sweet stock looking 81 GS1100E.

 

[Guest]

Why all you are doing but stock pipes & airbox?!!! Makes NO sense. Ray.

Form over function here. Close to stock looks are paramount over performance. Given that the box and pipes have to stay - how about stock bore and stock cams with the head and 1150 carbs?

I'm sure who the owner is wants to keep the stock look.

Head of nail, meet hammer!

 

[Guest]

Ah, I think maybe he wants a sleeper, something run of the mill looking that will blow them away when he opens the throttle.

 

[Guest]

It has to look stock (as stock as an '83 with '85 1150 pipes and carbs can look. Choking off some horses has to happen, I know - but can the rest of the combo function decently or is it best to keep the stock cams and cast pistons for the pipes and box?