Big Bore for KZ1000P / KZ1000J?

Big Bore for KZ1000P / KZ1000J? 30 Jan 2006 22:51 #20673

415ZR1
Topic Author
Offline
User
Posts: 12
Thank you received: 0

Did a forum search...and saw a post by APE Jay about 1076 for CHP bikes. Is that about it for J motors? Also had a look at APE KZ page but am not KZ savvy enough yet to know what fits.

What's available to increase displacement on a '95 KZ1000P-14? Will GPz blocks bolt-up? Big blocks like APE? Splitting cases and machine work is not a deterrent...

Currently running a Murray X-pipe (but sometimes a bastardized V-H 4-1, 2.5" collector, 2.5" core Summit Racing shorty glass pack muffler), Keihin CR Specials, Accel coils. Have GS-E swing arm and 4.5" Kosman widened stock wheel to bolt-on. Bike is sound, looks good and runs great. Would like to build a street-only, foot-boarded, police-faired sleeper/parts runner.

Post edited by: 415ZR1, at: 2006/01/31 09:17

Post edited by: 415ZR1, at: 2006/01/31 14:42

Please Log in or Create an account to join the conversation.

Big Bore for 1KZ000P/KZ1000J? 30 Jan 2006 23:01 #20675

RacerZ Offline User Posts: 39 Thank you received: 0	Have a look. www.mtceng.com/piston_kaw_jmodel.htm
	Please Log in or Create an account to join the conversation.

Big Bore for 1KZ000P/KZ1000J? 30 Jan 2006 23:06 #20676

415ZR1 Topic Author Offline User Posts: 12 Thank you received: 0	Doh! Didn't even think to check MTC. Thanks.
	Please Log in or Create an account to join the conversation.

Big Bore for 1KZ000P/KZ1000J? 30 Jan 2006 23:40 #20679

APE Jay Offline Banned Posts: 1403 Thank you received: 58	1076 is as big as you can go just boring the stock sleeves. 1260 in a stock block with big sleeves, Over that, 1500cc is the limit with one of our blocks. Jay www.KZzone.com
	Please Log in or Create an account to join the conversation.

Big Bore for 1KZ000P/KZ1000J? 31 Jan 2006 10:54 #20734

Spock
Offline
User
Posts: 32
Thank you received: 1

I have been waiting for this topic to show up.
Is there a concern for the J Model Engine as far as the Compression Ratio?
The stock compression is 9.2 to 1.
MTC offers 10.5 to 1.

I have heard that the 81 and later KZ-1000 head is prone to detonation when the compression is increased.

I asked about this some time ago and only pre 81 bike owners responded to say that they were happy with increased compression.

Is this concern just driven by a few owners that did not re-jet their carbs?
or, is there a real concern for increasing the Compression Ratio on 81 and later KZ-1000s.

Is the solution to use several cylinder base gaskets to take the compression down a bit?

Spock