dont need choke to start

[crazypaint]

bike runs like a champ. needles on the 4th clip down 160 pilots. the other really little ones are a 50 i belivie or a 60- cant remember now lol. do i worrie about this or not? have pods an a 4 into 1 propipe thats it

[Steve]

When you say "160 pilots" are you talking about the "pilot AIR jet" in the intake of the carb throat?
I hope so, as that is the stock size.

If you have installed #160 "pilot FUEL jets", I don't see how the bike would run. The pilot fuel jets are the ones in the bottom of the carb, next to the main jet and under the rubber plug.

Your stock pilot FUEL jets are 45. With your pods and a Pro pipe, you might have had to go to a 47.5, so a 50 would be overkill. You probably don't need to have the mixture screws out very far for that combination, do you?

[GabrielGoes]

When you say "160 pilots" are you talking about the "pilot AIR jet" in the intake of the carb throat?
I hope so, as that is the stock size.

If you have installed #160 "pilot FUEL jets", I don't see how the bike would run. The pilot fuel jets are the ones in the bottom of the carb, next to the main jet and under the rubber plug.

Your stock pilot FUEL jets are 45. With your pods and a Pro pipe, you might have had to go to a 47.5, so a 50 would be overkill. You probably don't need to have the mixture screws out very far for that combination, do you?

exactly what i was thinking i got 125 main jets and thats a little crazy, i see people that haev liek 145 etc. but 160!! that would be sending fuel like the gufl oil spill down into the ocean

[Steve]

exactly what i was thinking i got 125 main jets and thats a little crazy, i see people that haev liek 145 etc. but 160!! that would be sending fuel like the gufl oil spill down into the ocean

No, you need to read it carefully and also realize that different bikes need different jets.

He stated that he had "160 pilots". The pilot FUEL jets are stock at 45. Usually, that is OK, at least until you do a lot of work that allows the engine to breathe a lot better, then you might have to increase them ONE SIZE, up to a 47.5. Later he says something about "the other really little ones are a 50 i belivie or a 60", which leads me to think that he might have a #50 pilot FUEL jet in there and a #160 pilot AIR jet, which is the stock size.

He never mentioned what size main jets are in there. Stock is 107.5, but with his pods and pipe, something in the mid-120s would probably be right.

.

[Flyboy]

He also mentions that the bike runs like a champ, therefore I think Steve is right in asuming that the #160's are air and the 50 or 60's are fuel, or as he said, the bike would not run.

If the bike is running well and you are happy, I would not worry about the fact that it does not need choke to start, mine never did either, but then again it is always warm and hot here.

[Turtleface]

I've got something similar going on right now with mine as well. She starts pretty well with no choke, and my DJ kit instructions say I need to bump the pilot air jet size up. I'm still mussing around with tuning though, so we'll see how it goes in the long run. The fact that the ambient air temp is anywhere from 100-115 degrees might have something to do with it, as well. Even though tuning for pods is turning out to be quite the chore, I'm learned more about carb circuits in the past month than I did in my entire performance car hobby.

[makenzie71]

I never need the choke...actually the bike almost seems to start preemptively.

What kind of jetting should I be looking at with pods and a full exhaust (no baffle sometimes) on a 1981 GS750?

[trippivot]

you are close to perfect - for your bike

no choke may be fine and dandy but what do the plugs look like ?

a bike like that and many short short little trips may eventually foul a plug.

but if EVERYTIME you ride it long enough to get the plugs up to and over 600 degrees you'll be fine.

sounds like you are right close to perfect. it runs like a champ-now in this weather. may be even get better in the winter time.

fat jetting is cooler but prone to spark plug fouling and fuel saturation in the oil. Don't forget that rich un-burned mixture builds up on the back side of the valves too

leaner jetting allows the plugs clean themselves much quicker

I like the bike to NEED the enrichener for immediate COLD start up and maybe 1 minute not much longer until it cleans up and revs and idles.

if there is heat in the engine==pulling the choke should kill the engine but should excite the starting event when cold.

you really do not have a problem and fine tuning is an option unless you do not always fully heat up your machine.

[boingk]

What kind of jetting should I be looking at with pods and a full exhaust (no baffle sometimes) on a 1981 GS750?

Check my 'tuning modificatyions & theory for intake and exhaust' thread in the 'Carbs & induction' part of the technical board. I'd start out with mainjets just less than 20% over stock (eg 110 mainjet becomes 130 mainjet), although many will tell you to just go and get a Dynojet Stage 3 kit - its up to you which direction you want to go... the kit (easy, all there, minor tweaking) or DIY (can be a pain).

I like DIY, but I won't recommend it unless you know the options.

On choke, the warmer weather will definitely be helping your bike start. When I go to start my bike in the morning at the moment (40'F/5'C) it'll only kick over on choke. I hold that for maybe 20 seconds, then hold idle with throttle and release choke, then keep engine revs the sane side of 5k when riding until the bike has warmed up. In warm weather, I would not worry about not having to use choke.

Cheers - boingk