big bore conversion

[gsnewbie]

is a big bore conversion out of the question for gs500. i was thinking this would be a pretty easy way to increase the torque. it seems to work pretty well with otherwise mundane 4 strokes. my only experience was with four wheelers. we did 727 kits on 660's and it made a huge difference! everyones thoughts would be great. I'm sure this has been discussed a gazillion times but i thought id revive it.

PS help on how to post pictures would be greatly appreciated as well.
thanks everyone

[burning1]

A number of people have over-bored the cylinders and installed larger pistons. A quick search will turn up a bunch of threads on the topic.

[KlaXon]

Cant find any threads about things like that.
Any links?

[Big Rich]

Search for GR650.

[gsJack]

Search "wiseco pistons" and you'll find the big bore threads.

[gsnewbie]

when i search wiseco pistons the only thing i get is the message telling me to search wiesco pistons nothing else comes up.
thanks

[mike__R]

http://gstwins.com/gsboard/index.php?topic=14401.0

Looks like you need to go out to the main forum area to search in order to get this kind of result.

[gsJack]

when i search wiseco pistons the only thing i get is the message telling me to search wiesco pistons nothing else comes up.
thanks

I entered wiseco pistons right here and got 3 pages of posts:

http://gstwins.com/gsboard/index.php?action=search

Just did it again and got same results.

[BaltimoreGS]

Anyone here have experience with the long term durability of the GS engine with a big bore kit?  The only GS engine I've dealt with that had an overbore kit in it broke the crankshaft.  Don't know if that was a direct result of the big bore kit or other abuse.

-Jessie

[The Buddha]

I have some reliable sources that say no more than 569 if you dont want to break crank shafts. And that is in a race bike, street bikes take a lot more abuse IMHO, they dont get to run 10 miles every other weekend and take it easy and get fussed over the rest of the time.
However they also were running a high compression motor. Wonder what would happen if we dropped the compression to maybe 8.7 or so and bored it to say 580 ...

The GR can be bored to 851 like my friend did, but of course he machined everything on it ...
Cool.
Buddha.

[redhenracing2]

I want to say thee were some people using pistons out of the old 1100 kawasakis . . . .

[redhenracing2]

Yay, searchings

http://gstwins.com/gsboard/index.php?topic=14401.msg123943#msg123943

[burning1]

And that is in a race bike, street bikes take a lot more abuse IMHO

I disagree with this. My race GS gets about 15MPG; worse than my K1300GT around the track. I go through brake components at an alarming rate, and burn oil at a rate of about 1 quart per 300 miles. It may only do 10 miles at a session, but it does most of those miles WOT, or hard on the brakes. The thing sees some serious abuse, way beyond what most street bikes will see.

they dont get to run 10 miles every other weekend and take it easy and get fussed over the rest of the time.

I agree with this completely. Smart racers go through their bike several times a year, and the guys running major over-bores do it expecting to rebuild the engine on a yearly basis.

[The Buddha]

And that is in a race bike, street bikes take a lot more abuse IMHO

I disagree with this. My race GS gets about 15MPG; worse than my K1300GT around the track. I go through brake components at an alarming rate, and burn oil at a rate of about 1 quart per 300 miles. It may only do 10 miles at a session, but it does most of those miles WOT, or hard on the brakes. The thing sees some serious abuse, way beyond what most street bikes will see.

they dont get to run 10 miles every other weekend and take it easy and get fussed over the rest of the time.

I agree with this completely. Smart racers go through their bike several times a year, and the guys running major over-bores do it expecting to rebuild the engine on a yearly basis.

Street bikes get lugged in too high a gear, they get cold started and rode away, they dont get oil checked as often as it should, 1/2 clutching when riding instead of down shifting, plus they suffer from long strings of newbie owners with it being a GS. New to riding, new to maintaining, new to everything. That kinda abuse I meant. I mean we both know the maximum engine wear occours @ cold start up, and long term damage inflicted by lugging can kill bearings in a matter of a few miles. Come on man, you've seen the noob's. Its general abuse of everything, just from being young and broke and clueless.

You I am sure run 0 wt synthetic oil, never ride without it being fully up to temp, and your oil use is mainly a function of the high rpm and the fact that its 0 wt. It will slip past anything, that's what you need.

Cool.
Buddha.

[burning1]

Fair enough. There's no abuse like the neglect of a careless owner.

[Pelikan]

For the cost of boring out and the hit to reliability, it might make more sense to just buy a bigger bike.

[redhenracing2]

it might make more sense to just buy a bigger bike.

Beating a dead horse around here.

[burning1]

Simple way to make a GS500 faster than a stock 2011 Suzuki GSXR 600.

1. Install rain tires.
2. Wait for a rainy day at your local track.
3. Register for the C group.
4. WOT down the front straight.