z650 build

Performance discussion for other bikes

z650 build

Postby rangeroy » Thu Jan 17, 2019 1:39 pm

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got this of a mate 3years ago


had a hard time trying to get a reliable tickover would run great above 2k,cleaned carbs balanced them,changed plugs & did the wired george fix to get 12v to coils, changed pilots all to no difference,then just by chance checked the vaccum pipe & its full of fuel the tap diaphram had a split in it & the engine was pulling fuel thru just enough to kill the spark at low revs but not enough to affect performance above 2k
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Re: z650 build

Postby rangeroy » Thu Jan 17, 2019 5:16 pm

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hyvo motor
after running the single row cam chain engine for a while I swapped a similar bottom end for a hyvo chained bottom end, got hold of a hyvo cylinder head & put back together, I went down this route so I could use gpz 750 cams at some point.
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hyvo motor complete

of course then i had another plan!! shed rebuild
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old shed half gone

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all gone

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new base

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new shed

I ran this motor for a short while, then of course the starter clutch gave up & no kicker fitted :cry
Back to the drawing board & another plan, rebuild this motor with a gpz 550 six speed gearbox,zr7 starter clutch & oil pump, get hold of a set of z750 barrels & bore out to 810cc fit a gpz750 head & cams, upgrade with valve springs from APE & degree the cams, refit this motor after taking out a gpz750 unit thats in the frame now :cool: & then fuel inject using some gpz1100 throttle bodies & a megasquirt ecu :)
Attachments
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all done (nearly)
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hyvo motor fitted
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Re: z650 build

Postby mankam » Thu Jan 17, 2019 7:31 pm

:popcorn :popcorn :popcorn
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Re: z650 build

Postby rangeroy » Thu Jan 17, 2019 8:04 pm

IMG_20171003_133652.jpg
cam box off
this is the gpz motor that's sat in the z650 now

put a z650 sump pan back on the gpz motor because i dont need to run an oil cooler & gpz's have an oil level switch not a oil pressure like the z650, had to remove the blanking plug fom under the ignition rotor to fit a pressure switch
Attachments
IMG_20171004_101513.jpg
sump off nice & clean inside
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blanking plug
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pressure switch fitted
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gpz motor in frame
IMG_20180103_113211.jpg
then another project
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1975 mar 250 ossa
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Re: z650 build

Postby rangeroy » Fri Jan 18, 2019 8:30 pm

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various parts
so moving on
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&on

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& on

get to this
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get to this


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finished

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sold on the bay :beer
back to z650
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crankcase bolts

dry & tight as you like :shock:
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old starter clutch out
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Re: z650 build

Postby rangeroy » Sat Jan 19, 2019 8:37 pm

IMG_20181025_163808.jpg
gpz 550 6spd

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crankcase put together & gear shift checked

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zr7 starter clutch

zr7 starter clutch, secondary shaft & starter gear
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test fitting

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fitted with zr7 oil pump also

IMG_20181101_162041.jpg
rebored barrels back
:)
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Re: z650 build

Postby rangeroy » Mon Jan 21, 2019 8:13 pm

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z650 clutch on left v zr7 clutch, no real diff after 20yrs just friction plates thicker but steel thinner
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oil relief valves z650 on left

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ape springs :-)

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viton valve guide seals


all taking shape :) slowly
Attachments
IMG_20181125_134513.jpg
barrels torqued down to check deck height
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Re: z650 build

Postby rangeroy » Wed Mar 06, 2019 5:30 pm

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rev counter electronic

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strobe revs


back working on this motor now its a little warmer needed to sort out a electronic rev counter as the gpz head has no cable outlet, bought a Suzuki gsx750f rev counter off ebay for £15 pulled it apart & stripped out the manual workings off the z650 rev counter, rebuilt & a quick bodge to the battery & coil pickup the check readings with strobe to see if they match on the rev counter face (close enough for me)

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28mm mikunis

putting these on the rebuild to run the motor in before going down the injector route just to make sure all is good first

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looks okay
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bit tight underneath may have to make a manual cam chain adjuster :(
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