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Author Topic: 81 kz 650 csr?  (Read 2197 times)

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usccorbin

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81 kz 650 csr?
« on: March 08, 2011, 06:02:40 PM »

my first kz. first vintage bike too. trying tomodify it as simply as i can and the local shops have been no help. im mainly interested to know what the stock carb size is (so i can get a snug k&n) and where to buy rebuild and jet kits. bike is running rough due to the hacked exhuast (cut literally right as they turn back under the bike, also no air box or pod filters, just the sleeves). also having some sync problems. i am very noobish to carbed bikes so i can use all the help i can get. feel free to suggest anything that would be useful and also if u got some parts to sell let me know. u can see the bike in my other post titled new member, new project, 1st kz. thanks people
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TomD

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Re: 81 kz 650 csr?
« Reply #1 on: March 08, 2011, 07:40:19 PM »

Welcome aboard,
This is one newbie helping out another.  I too have recently acquired an old project bike; mine being a one owner 1983 KZ650 CSR with 6063 miles.  Unfortunately it was stored under a tarp for some years, but I have boiled out the carbs, re-jetted two sizes larger, and installed pods.  It passed the compression test and runs crisp, so now the rest of the cafe racer style rebuild will continue.  This forum is a wealth of information and I check it every time I have a question my Kawasaki repair manual can't answer.  For parts, I have purchased from www.z1enterprises.com and www.oldbikebarn.com

For carburetors, the 83 model uses Mikuni BS32 CV type, but earlier models use smooth bore.  You can search this site and you will find the answers you are looking for, plus answers to questions you have not even thought of yet.  Good luck.

Tom
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Massachusetts

current project: 83KZ650CSR (6K original miles)
unplanned current project: 1978 C2 with 1980 engine (3060 miles!)
next project: 1979 KZ650 B3 (14K original miles)
main ride: 2010 Concours14 ABS (absolute joy!)
others: Suzuki DR350S, couple of Suzuki Vinson 500 quads

Previous rides:
Suzuki T500
Yamaha XS650
Ossa 250
Can Am 250
Bultaco 370
Husqvarna 360
HD Dyna Super Glide

usccorbin

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Re: 81 kz 650 csr?
« Reply #2 on: March 09, 2011, 02:58:39 AM »

thats quite a find. mine is fourth owner "25000" or so. i have a bike guru helping but i am limited my time with him unfortunately so i am trying my best to do what i can with what i can. i appreciate the help and all the info. ive use the advice and it has helped so u have no benn ignored sir. good luck with your kaw. folow my project and send pics. i Frackin love kawa's!
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omgbossis29

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Re: 81 kz 650 csr?
« Reply #3 on: March 09, 2011, 07:48:43 AM »

Good find indeed!  I scooped up this 82 csr with 18,000 miles on it for $500 but the PO beat it up pretty bad.  The carbs are the bs32 carbs, direct swaps with the bs34s. 
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82 KZ650 bs34 carbs

rstnick

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Re: 81 kz 650 csr?
« Reply #4 on: March 09, 2011, 04:53:54 PM »

'81 CSRs may still have the VM24SS carbs:



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Rob

KZ650.info home page with tech tips, manual downloads, how tos, etc: http://kz650.info/

'77 C1 project - newest
'78 C2 Candy Apple Blue, 107 500 kms, 18" wheels front & back, Rickman fairing, Koni shocks, Progressive springs, braced stock swingarm, GSXR600 rear sets, ATK fork brace, SS brake lines, Kerker exhaust, K&N filter in air box, ported, 1st over bore, Kawi electronic ignition, bought in '84.
'78 C2 project 6 #s off other C2
'79 C3 frame with title & bits, was my brother's.

gd4now

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Re: 81 kz 650 csr?
« Reply #5 on: March 09, 2011, 05:01:26 PM »

I agree with Rob - from the research I have done on what carbs were used on which models all of the data I can find indicate the use of the BS32 carbs did not start until the 82 model year.  So if you do have an 81 and it still has the stock carbs and was a US bike then I am willing to bet they are VM24s with an accelerator pump.  Stock they most likely had a "92.5 "main jet, a 5CL30 needle, and a 15 pilot jet.
« Last Edit: March 11, 2011, 10:24:04 PM by gd4now »
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Bruce
1977 KZ 650 B1
This is my Z

omgbossis29

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Re: 81 kz 650 csr?
« Reply #6 on: March 09, 2011, 07:15:30 PM »

I stand corrected  :D  I thought they were 81-83, my fault.
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82 KZ650 bs34 carbs

TomD

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Re: 81 kz 650 csr?
« Reply #7 on: March 09, 2011, 09:44:28 PM »

The real reason I purchased this was for the engine; I figured one owner with 6063 miles should be safe.  I did have second thoughts as the condition was not what I expected, but I figured I could get my $500 back as long as the engine wasn't junk.  The bike was last registered in NH in 1988 and the majority of the storage time was under a tarp, thankfully under a barn overhang.  The rest of the bike is in pretty poor shape; tires leaked, chain rusted, chrome pitted, master cylinder frozen,...  After boiling the carbs and changing the main and pilot jets & installing pods, the engine sounds sweet.  Now pretty much every other part will be replaced.  I am using herrdeacons cafe as inspiration.  That thing is beautiful!  I just ordered a cafe seat and pan from www.airtech-streamlining.com while working on the front forks (cleaning, new OEM seals & wipers, Progressive Suspension springs).  I plan to install a flat black Kerker 4:1; that was the hot set up in the day.  I am so glad this forum exists as the ideas and helpful solutions are never ending.
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Massachusetts

current project: 83KZ650CSR (6K original miles)
unplanned current project: 1978 C2 with 1980 engine (3060 miles!)
next project: 1979 KZ650 B3 (14K original miles)
main ride: 2010 Concours14 ABS (absolute joy!)
others: Suzuki DR350S, couple of Suzuki Vinson 500 quads

Previous rides:
Suzuki T500
Yamaha XS650
Ossa 250
Can Am 250
Bultaco 370
Husqvarna 360
HD Dyna Super Glide

gd4now

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Re: 81 kz 650 csr?
« Reply #8 on: March 09, 2011, 09:56:32 PM »

When you can post some picks of your project - we all like to see the machines.
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Bruce
1977 KZ 650 B1
This is my Z

usccorbin

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Re: 81 kz 650 csr?
« Reply #9 on: March 11, 2011, 03:17:10 PM »

http://forums.kz650.info/index.php?topic=5090.0

 heres the link for pic on another forum post. so would you suggest a jet kit, carbs sync, pods or wompy5000 kit on this forum, spark plugs and wires, and full exhaust? just want the motor to be back at 100%
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herk

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Re: 81 kz 650 csr?
« Reply #10 on: March 13, 2011, 09:06:21 PM »

Just measure the OD of the carburetors where the pods are going to fit.  It would be a good idea to pull the carbs & check what size main jets & pilot jets are in there.  Stock is 92.5 & 15.  Pods & non-stock exhaust will require larger sizes.  Also, take a look at the Jet Needles to see if there are any grooves in them (I believe they don't have them).  With pod filters & a cut exhaust or 4-1 exhaust, you'll probably have to raise the needles.  If there are no grooves, you'll have to use shims (small washers).

Z1Enterprises.com has some of the stuff you need, including jets.  
To find the jets on the Z1 site do a search for main jet or pilot jet (singular, not the plural, jets).
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Competition, Sports & Road

usccorbin

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Re: 81 kz 650 csr?
« Reply #11 on: March 13, 2011, 11:25:40 PM »

as soon as i get my hands on a caliper i know the size. thanks again. starting to have a pretty good looking project coming together and this mechanically is all i need.
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