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Trying to increase displacment

  • Thread starter Thread starter Anonymous
  • Start date Start date
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Anonymous

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i helped a guy with a 360 kawasaki triple put the jugs off of a 750 triple on top of his 360 motor. I was thinkin about tryin to fit the jugs off of an 1000 or 1100 gs onto my 850 any ideas on how well they will match up. Haven't worked on a gs bigger then my 850 so not sure exactly how motors match up for stroke or dimensions.
 
Re: Trying to increase displacment

gzone said:
i helped a guy with a 360 kawasaki triple put the jugs off of a 750 triple on top of his 360 motor. I was thinkin about tryin to fit the jugs off of an 1000 or 1100 gs onto my 850 any ideas on how well they will match up. Haven't worked on a gs bigger then my 850 so not sure exactly how motors match up for stroke or dimensions.
Click to expand...
those kawas are two strokes arent they??
 
Re: Trying to increase displacment

SLOWPOKE/SCOTTY said:
gzone said:
i helped a guy with a 360 kawasaki triple put the jugs off of a 750 triple on top of his 360 motor. I was thinkin about tryin to fit the jugs off of an 1000 or 1100 gs onto my 850 any ideas on how well they will match up. Haven't worked on a gs bigger then my 850 so not sure exactly how motors match up for stroke or dimensions.
Click to expand...
those kawas are two strokes arent they??
Click to expand...

Yup.
 
Trust me, it won't work; the strokes are different.
I'd love to get my hands on a Kawa triple though...
 
jojo said:
Trust me, it won't work; the strokes are different.
I'd love to get my hands on a Kawa triple though...
Click to expand...
JO JO my neighbor had 2 750s in his garage--one ran and the other as a parts bike--He moved just befor i had a chance to steal the good one. :( :( :(
 
most of the differance between the 850 and 1000 is the stroke, the gs 1000 pistons are only 1mm larger than the 850's and the 1100's is 2mm larger than the 1000's
 
focus frenzy said:
most of the differance between the 850 and 1000 is the stroke, the gs 1000 pistons are only 1mm larger than the 850's and the 1100's is 2mm larger than the 1000's
Click to expand...
Whats the redline on a stock 85 or 1000? Higher than 9k? Do you (or anyone) have a list of bore/stroke/rod_length/deck_height/valve_sizes/stock_cam_specs/etc? Or any of the above?


-=Whittey=-
 
The red line on my 79 gs1000E tach reads 8500,, but I know this motor will survive just fine with an occasional trip past 9000,, She's getting older so the trips are fewer these days,, But I've owned it for 7 or 8 years and might of had it up to 10 on a missed shift.. that I wouldn't recommend! 8O
 
Thats....wierd... A shorter stroke and a lower redline? Perhaps the bearings don't like it, or they were afraid of valve recession? Hrm. Perhaps they didn't think they could get a proper lowend if they had a tall top end? Wierd...


-=Whittey=-
 
Whittey said:
Thats....wierd... A shorter stroke and a lower redline? Perhaps the bearings don't like it, or they were afraid of valve recession? Hrm. Perhaps they didn't think they could get a proper lowend if they had a tall top end? Wierd...


-=Whittey=-
Click to expand...

The big concern is valve float...don't need those valve things meeting up with those piston things! Get stronger valve springs and you can raise your redline a little BUT you lose some horse power due to the extra energy needed to open and close the valves and there will be an increase of wear and tear on the valve gear.

So you get more aggressive cams to offset the power loss, then new carbs and header to handle the increase on air flow, port the head to take full advantage of the new flow capabilities, weld the crank to insure that the bottom end stays together, beef up the clutch housing to insure it does not fly apart on you due to the extra strain from the additional HP, back cut the transmission gears to handle the extra shock the additional HP will place on the transmission, put in a big bore kit because, heck, you have the engine torn down any way, add an oil cooler to get rid of the new excess heat you are generating, replace all your bearings, replace the chain, gears, and tire because they are wearing out a lot faster now, build up a cash reserve for the additional tickets you will be getting...

Oh...you just wanted to rev a little more...

Hap :roll:
 
Hap is right, the GS has a roller crank, so actual RPM's don't really hurt it except in the valve float department. Even with 'heavy duty' type springs, there is a limit......
 
Does anyone here know what the seat pressure is at installed height on a stock 1100 or 850? What is it on some of the newer engines with redlines up past 12k? I'm assuming the newer bikes don't use nifty things like pneumatics, etc. When you can get an OHV engine to spin up to 9k rpm, a DOHC should be pretty easy to get to spin much faster, yes?


-=Whittey=-
 
thanks that was my biggest question was if the difference was in the stroke or bore size.
 
Newer bikes you are talking about have 4 valves per cyl, lighter smaller valves that don't require excessive spring pressures to keep them closed It doesn't matter if it is single or dual overhead cam
 
gzone said:
thanks that was my biggest question was if the difference was in the stroke or bore size.
Click to expand...

Another concern will be cylinder spacing...I am not sure if the GS850 engine is closer to the GS750 or to the GS1000.

Hap
 
specs

specs

How 'bout bigger jugs for a 450??

Where could one obtain all these specs, online maybe? Hate to buy a manual for every model!! Maybe there should be a page on this site listing said specs for all the GS engine sizes??
 
Re: specs

Re: specs

Frank B said:
How 'bout bigger jugs for a 450??

Where could one obtain all these specs, online maybe? Hate to buy a manual for every model!! Maybe there should be a page on this site listing said specs for all the GS engine sizes??
Click to expand...
I dont think the rod spacing would allow you to make the bike much larger. It is hard enough to get a 750 and an 1100 to have a larger displacement. Look at the percentages. an 1100with a 1166 kit only goes 91cc over stock. I believe that is 8 %
Take the 450 out by 8% and you get 486cc--if there is enough meat in the jugs to do it--of cours if funds are un limited and you own a machine shop then the sky is the limit.
 
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