Gs1000 jetting question

[THUNDER]

I'm restoring a 1979 GS1000 chopper, was wondering what jetting rage I should be in with 4 straight open pipes

thank you
tony

[Steve]

That is pretty much unknown (and unwanted) territory around here, so the only suggestion I can give is: read your spark plugs, richen up until they look good.

What part of the world are you blasting through, so I know where to avoid?

.

[THUNDER]

Steve,
unwanted?... dam that is going to leave a mark
northern new jersey...where else am I going to get info to keep this classic alive? most are Honda 750 chops I found a real unique machine with a gs1000 motor in it..thought it was cool

T

[OldVet66]

Most of us here love these GS motorcycles because they are reliable and handled really well for bikes manufactured 30 years ago, and like to bring old classic machinery back to life. Inflicting the noise of straight pipes on innocent bystanders is not usually part of that. The inline four makes obnoxious noise with opened pipes. Opened pipes are all obnoxious in my book, but at least the Harley, being a two cylinder section of a odd fire radial aircraft motor has a nostalgic sound with a pleasing cadence. Love those old War Birds! If I ride with my buddy with his Harley with opened baffles, he rides behind me so I don't have to put up with the noise. If you like choppers that, by the way, destroy a bikes handling characteristics, more power to you, but I would bet you would get a lot more help if you made some cool looking pipes that were suppressed and had enough back pressure so the motor could be jetted to run more or less as it was designed to. I understand stock Harley mufflers can be had really cheap, bet you could make something really cool using them.

[srsupertrap]

+1 OldVet66:

No offense Mr. THUNDER but by an large when the GSer community reads a thread on a GS Bobber or in your case a GS1000 chopper most of us know that GS has reached or is nearing the end of its road. You of course may be the exception to that rule

vm26 Main jets are normally bumped to 107.5 -112.5 with 4 INTO 1

[OldVet66]

My bike with 4-1 Vance and Hines exhaust and K&N pods uses a Dynojet 3304 stage 3 jet kit. I use the Dynojet 142 jets (Mikuni 132.5 jets), so you would start out with at least a 130-132.5 jet with some back pressure on each exhaust if you also use the pods. Hint, used Harley mufflers on the exhaust.

[Big T]

I was going to say start with 127.5s, you'll end up somewhere in the 130 range with open pipes, I'd guess

You may have to bump the pilot jet to 17.5.
I'd go slightly over one turn out on the fuel screw and 2+ turns out on the air screw


Plug chops are your friend

If you want open pipes, have your open pipes. Some people on the forum are just sticklers for normalcy

[THUNDER]

thanks guys, i respect the trational thing... i'm just trying to keep this old girl alive....(I'd go slightly over one turn out on the fuel screw and 2+ turns out on the air screw
Plug chops are your friend? )

[Steve]

Steve,
unwanted?... dam that is going to leave a mark
northern new jersey...where else am I going to get info to keep this classic alive? most are Honda 750 chops I found a real unique machine with a gs1000 motor in it..thought it was cool

T

Ssosrry, that may have seemed a bit harsh, but OldVet66 replied with pretty much what I was thinking.

IIf you want open pipes, have your open pipes. Some people on the forum are just sticklers for normalcy

It's not just "normalcy" that I crave, it's also the freedom of being able to ride a motorcycle. I have actually been to some places where motorcycles are not allowed. When asked why, the reply was something along the lines of "they make too much noise". After a hot rod with rather open pipes rumbled on in, I fired up my GoldWing and tried to go in, but was turned away. After all, the ban was not on 'loud vehicles', it was on 'motorcycles'.

I still voice my opinion, but I have learned to temper the tone a bit. However, I do still refuse to give tech advice that would help get such a machine back on the road.
Usually, you would not know that I am avoiding that thread, this time, I let it slip.

Thanks for letting me know to avoid northern New Jersey. Last time I was there I was shown around some of the area by a young muffin maker on a nice, quiet 750, had a wonderful time.

.