Bigbore 2st cylinder identification help.

[ola_martin]

What is this top end for?
86mm chrome bore.

[ola_martin]

Cheers

[Krikey]

Must be some identifying marks on it? Anything other than the cc's?

[tony27]

Early KX500? Definitely not YZ465 or 490

[pokey]

That head screams KX and i think late 83 were 86mm


KX500 Cylinder diameter
1983 - New 86.000-86.015mm or 3.3858-3.3864" - Service Limit 86.10mm or 3.390"
1984 - New 86.010-86.025mm or 3.3862-3.3868" - Service Limit 86.10mm or 3.390"
1985-2004 - New 86.020-86.035mm or 3.3866-3.3872" - Service Limit 86.10mm or 3.390"

[ola_martin]

Thanks, it's a 84 KX500, I was fooled by the 83 and 84 having different reedblocks.

[Nathan S]

I saw the intake and thought "Yamaha!", which made me doubt myself.
But no, it is Kawi:
http://www.partzilla.com/parts/search/Kawasaki/Motorcycle/1984/KX500-A2+KX500/CYLINDER+HEAD-CYLINDER-REED+VALVE+%28'84+A/parts.html

[pokey]

Here is one on Fleabay for comparison

http://www.ebay.com/itm/1983-KX500-CYLINDER-VINTAGE-MX-AHRMA-83-KX-500-/121832750326?fits=Model%3AKX500&hash=item1c5dcc3cf6:g:lHUAAOSwNphWYrlU&vxp=mtr

[GMC]

Thanks, it's a 84 KX500, I was fooled by the 83 and 84 having different reedblocks.

Yes the 83 & 84 do have different reed blocks (you can fit a V force to an 83 but not the 84)
But the exhaust spigot on your barrel has the groove for a O ring which is typical of the 83 barrel.
84 model had the O rings in the exhaust rather than the barrel

[Bumper]

I have an 83 kx500 single plug bike and a 84 kx500 twin plug bike sitting
here in front of me now,83 6 bolt intake , 84 4 bolt intake ,but the 84 head
has 5 fins at the front and 3 at the back ,and look both the same as pokeys pic
not the sand cast head
BUMPER

[GMC]

Ah yes, twin plug head, I stand corrected, I missed that.
Still I wasn't aware the 84 barrel had a O ring groove in the barrel?

[OverTheHill]

http://www.partzilla.com/parts/search/Kawasaki/Motorcycle/1984/KX500-A2+KX500/IGNITION+%28%2784+A2%29/parts.html

twin plug coil