Kawasaki Sportsbike Riders Club - Australia - Online Forum

I heard today that there was a 1980's ZZR that was 305cc?? (Was it a 350cc not 305 maybe...sounded strange being 305cc)

Is that true?

Is this motor based on the current 250cc motor?

Does anyone know exactly the year, model and other details for this engine??

Would parts be still available for it?? Anyone know where I might find one?

Tack
there WAS a 305cc Kwaka Sportsbike in the 80's ('82 to about '90)
it was the GPz305 ...
yep big bro' to the GPz2fiddy....
there was no ZZR version..sorry

piccie attached

Tack wrote:Is this motor based on the current 250cc motor?

...no..its an air cooled twin, the current is water cooled..better

Does anyone know exactly the year, model and other details for this engine??

the model is EX305A and the bike was from '82 to about '90
the same emgine was used in the LTD cruiser model...

Would parts be still available for it?? Anyone know where I might find one?

why? this is an old engine, not as good as the current 250
parts? hard to find and expensive...


hth

cheers

Yes thanks smitty....I was hopin I might be able to use some parts to increase the capacity of the 250...I wonder what the piston size was??

Tack wrote:Yes thanks smitty....I was hopin I might be able to use some parts to increase the capacity of the 250...I wonder what the piston size was??

Dunno the piston size, but here's the part numbers:

Ref # Part # Description Qty Spec Code
11005 11005-1374 CYLINDER-ENGINE,F.BLA 1
11009 11060-1058 GASKET,CYLINDER 1
13001 13001-1116 PISTON-ENGINE,STD 2
13002 13002-1051 PIN-PISTON 2
13008 13008-1014 RING-SET-PISTON,STD 2
13024 13024-1052 RING-SET PISTON LL,O/ 2
13025 13025-1052 RING-SET PISTON L,O/S 2
13027 13027-1052 PISTON-ENGINE LL,O/S 2
13029 13029-1054 PISTON-ENGINE L,O/S 0 2
92033 92033-1151 RING-SNAP,PISTON PIN 4
92043 92042-031 PIN,DOWEL,12MM 2
92055 92055-1150 O RING,10MM 2

Tack wrote:Yes thanks smitty....I was hopin I might be able to use some parts to increase the capacity of the 250...I wonder what the piston size was??

what you want miracles too??? hehehe
Tack
I am guessing here
but your barrels won't take a 305 pistons
even fully bored out
unless they also increased the stroke a lot to get to 305cc
why?
that will teach me for chucking the bloody manual
when i sold the GPz250

our mate ratmick has been a visiting BuyKawasaki
by the looks (thanks Mick)
but still no clue as to size

Tack
why not just a bigger bike or you like the 250....?

Smitty wrote:...our mate ratmick has been a visiting BuyKawasaki
by the looks (thanks Mick)
but still no clue as to size

Mate, I'm just getting warmed up...

Here's more info:

~~~~~ ENGINE SPECIFICATION ~~~~~
GPZ305A
Bore: 61.0mm
Stroke: 52.4mm
Comp: 7.7-12.0kgcm2

~~~~~ CLEARANCES ~~~~~ (cold)
Piston to: -
in valve: 0.14-0.19mm
ex valve: 0.21-0.26mm
Cylinder: 0.030-0.057mm

~~~~~ IDENTIFICATION OF MODEL ~~~~~

(MAR 83) EX305A1 (EX305A-000001) Introduced with a double cradle frameand Unitrak rear suspension, a small handlebar fairing and 5 spoke alloy wheels, Finished in Red with Black chrome silencer on both exhausts and a Black finish engine, Chain Driven

(JAN 84) EX305B2 (EX305B-002501) Replaces the EX305A1 with an additional Silver finish and now new Belt Drive.

(OCT 84) EX305B3 (EX305B-004601) Introduced similar to the EX305B2 but with modified crankshaft and new style clutch lifter and passenger grab strap

(FEB 85) EX305B2 (EX305B-004600) Discontinued

(JAN 86) EX305B4 (EX305B-006701) Introduced same as the EX305B3 but with new finishes in Red or Black

(MAR 87) EX305B3 (EX305B-006700) Discontinued

(MAY 87) EX305B5 (EX305B-006701) Replaces the EX305B4 same

specification as the EX305B4 and finishes, frame numbers also follow the sequence

(APR 91) EX305B8 (EX305B-014001) Introduced with the same specifcation as the EX305B5/B4 and the same finishes

(OCT 91) EX305B5 Discontinued

(JUN 93) EX305B9 (EX305B-017001) Introduced with no changes from the EX305B8 except factory fitted anti icing equipment and it only comes in the finish Red

(NOV 93) EX305B8 (EX305B-017000) Discontinued

(MAY 94) EX305B10 (EX305B-018001) Replaces the EX305B9 new finish in Navy Blue with Red/Mauve stripes

well done Mick...

still think it wont work.....unless..hmmm
maybe swapping barrels and rods/pistons might work on an older GPz250
think that works...

pretty sure though
won't work on later water cooled2fiddys though...

and one thing...
you MUST get the valve clearances correct on these engines
otherwise you burn the valves...I know!


Mick
what else ya got..?

cheers

hmm welcome back to "nerdsville" mick...long time no nerdiness!!

OMG is that thing ugly as a hat full of butt holes or what.. ROFL.. hahaha

sounds like it's abit to much effort to me...
IMO do the exhaust, air filter, tweak the carbs and just pray for a new 600 to come along

Dan wrote:OMG is that thing ugly as a hat full of butt holes or what.. ROFL.. hahaha

Dan
in '82 they were the ducks guts.....

So you're telling me in bike terms it is Pate' (Pron: Pat-ay)

Dan wrote:So you're telling me in bike terms it is Pate' (Pron: Pat-ay)

bwhahahahaha
you mean foie gras....
I prefer chicken patè myself...


actually....
'the ducks guts' defn.... saying (slang)
"something very good or something approved"
source-
http://australian.lifetips.com/article/431/slang-d-s/

ya lesson for the day

Thanks for all the info....

The bottom line is that I have to stay on 250cc restriction for 12 months and I am not happy with the power......I reckon a push bike would have a better power to weight.....

thanks again

I know it's hard but if you can learn to ride the bike without worrying about the power you'll be better off when you finally get the power...and handling...and sticky tyres...etc etc etc