1000 big bore

[Jd Powell]

Trying to gather advice or what is the best way to substantially increase the displacement of a 1980 GS1000G. What overbores are available and what are their pros/cons. Also, what about 1100g swappability?

[aosmith]

You could possibly use the 1100 pistons (iirc) but keep in mind you could also do a stroker and gain some torque

[Jd Powell]

I haven't heard of any stroker GS's. Is this an aftermarket crank, or a direct swap from another bike? Keep in mind I am looking for serious information from those who have done this and know. Not random guesses or assumptions.

[aosmith]

the stroker was a random guess but there are companies that make rods/cranks to spec

[The Fiddler]

I just tried searching for any kind of stroker kit for Suzuki GS motorcycles but came up dry. Sounds like a good idea but it seems these kits are either more for smaller displacement atv engines, or full size auto engines.

Anyone know of a GS stroker kit?

F

[80GS1000]

Trying to gather advice or what is the best way to substantially increase the displacement of a 1980 GS1000G. What overbores are available and what are their pros/cons. Also, what about 1100g swappability?

Wiseco makes 1085 and 1100 cc piston kits for the GS1000. You'll need to get your cylinders overbored. http://www.gszone.biz/pistons.html Give APE a call, they've done this a million times and can sell you the pistons plus do the machine work.

[JohnnyV]

Poked around there awhile sounds like they modify your crank to make it a stroker. Just the lightening and balancing would help big time.

http://www.aperaceparts.com/crankwork.html

[Nessism]

8 valve GS engines (except for 650) use a roller bearing crank. Not sure but stroker roller cranks sound more difficult than a plane bearing crank. Ape would know.

[SqDancerLynn1]

You do NOT stroke a roller bearing crank. If you have enough money I bet you could use a Giant 1400cc racing block

[first timer]

i have never seen a stroked gs before, i think tht is harley talk. If you want more displacment go with a wiseco kit, they are the only company that makes piston kits for your bike. i am also guessing since it a shafty and not a race bike you don't want to spent 3500 on building a engine. So just do the piston kit and don't mess with the crank, maybe just check it for trueness and get it welded. Other then that don't waste your money.

[aosmith]

It was harley but when i think of "chopper" huge torque not huge hp comes to mind right?

[first timer]

usally yes, HD's have large amounts of torque because they have lots of displacement and rotating mass. a 1800cc HD may make 100hp with about 100 ft/lbs if they are lucky, as compared to a 998cc gsxr1000 that will make about 175 hp and 85 ft/lbs.

HD motors aren't designed to spin very fast so the only way they can get power is by increasing displament and once you can't bore any bigger the oly think left is longer stroke.

The Gs motors love to spin, the shorter stroke the better usally that lets them spin quicker and when they spin quicker they make more HP.

so like said, don't mess with crank (stroke) because noone really does around here you get a bigger bang for your buck by just going a few cc's bigger in bore size.

[Jd Powell]

Thanks this bike is my only transportation and no dragbike. I'm just looking for a reliable boost in performance to keep up in the 21st century. I'll do some more research as to the differences between the1085 & 1100.

[chef1366]

If you want some ideals look below. No random guesses here.