Engine 17.5k topics

Camshaft, cylinder head, valves, cylinder block, pistons, exhaust, crankshaft, clutch, transmission, engine lubrication system, etc.
48 Replies

ZX7/Z1 Oil Cooler

Category: Engine Topic started 18 Nov 2015 14:46, by SWest
35.6k Views
Last Post by SWest 28 Feb 2016 16:49
0 Replies

Tech Forum Rules

Category: Engine Topic started 18 Jun 2007 20:45, by KZQ
29.8k Views
Last Post by KZQ 18 Jun 2007 20:45
 
42 Replies

Blown motor

Category: Engine Topic started 28 Jan 2026 06:55, by Larry G
637 Views
Last Post by daveo Today 18:01
80 Replies

Terrible motor swap idea kz440

Category: Engine Topic started 22 Dec 2025 07:42, by bound
1919 Views
Last Post by Wookie58 Yesterday 00:23
9 Replies

HELP!!!! Engine block fisured!!!!!

Category: Engine Topic started 02 Feb 2026 12:55, by Ilfrid
233 Views
Last Post by daveo 04 Feb 2026 07:45
3 Replies

Porting the Z1 by Joe Hooper

Category: Engine Topic started 02 Feb 2026 14:45, by KZQ
210 Views
Last Post by KZQ 04 Feb 2026 05:50
21 Replies

Piston rings set

Category: Engine Topic started 24 Sep 2025 14:00, by Tjpgi
1954 Views
Last Post by Tjpgi 02 Feb 2026 10:58
7 Replies

Unusual cam wear

Category: Engine Topic started 30 Jan 2026 16:35, by danam
168 Views
Last Post by asphalt900 02 Feb 2026 04:30
3 Replies

Cam chain tensioner play

Category: Engine Topic started 01 Feb 2026 14:22, by danam
114 Views
Last Post by asphalt900 02 Feb 2026 04:18
92 Replies

Top-End Reassembly

Category: Engine Topic started 24 Oct 2025 00:16, by daveo
4654 Views
Last Post by zed1015 01 Feb 2026 12:58
4 Replies

Z1 Transmission Bearing

Category: Engine Topic started 30 Jan 2026 20:20, by JT-NZ
176 Views
Last Post by Cra-z1 01 Feb 2026 09:33
9 Replies

ID me

Category: Engine Topic started 27 Dec 2025 23:18, by Mr. E
388 Views
Last Post by Street Fighter LTD 31 Jan 2026 07:56
3 Replies

anyone familiar with Gemini exhausts?

Category: Engine Topic started 17 Dec 2005 20:57, by MkII
2248 Views
Last Post by gd4now 30 Jan 2026 10:59
6 Replies

Slotted J cam sprockets

Category: Engine Topic started 29 Jan 2026 07:39, by Wookie58
151 Views
Last Post by Wookie58 30 Jan 2026 00:27
20 Replies

Upgrading a KZ400 engine with 440 cylinders and oversize pistons

Category: Engine Topic started 28 Dec 2025 05:36, by quantity
707 Views
Last Post by quantity 28 Jan 2026 15:36
3 Replies

Z1 Kickstart Cover

Category: Engine Topic started 24 Jan 2026 19:38, by JT-NZ
175 Views
Last Post by JT-NZ 25 Jan 2026 23:12
11 Replies

Wiseco 810 piston rings

Category: Engine Topic started 11 Jan 2026 12:36, by turboguzzi
292 Views
Last Post by turboguzzi 25 Jan 2026 01:49
16 Replies

Cam End Plugs + Stripped Valve Cover Threads

Category: Engine Topic started 05 Jan 2026 15:22, by tobeerortobike
620 Views
Last Post by bry195 23 Jan 2026 17:20
11 Replies

One simple question

Category: Engine Topic started 13 Jan 2026 10:01, by lovethemkzs
215 Views
Last Post by lovethemkzs 16 Jan 2026 11:03
13 Replies

650/750 engine in Z1 frame?

Category: Engine Topic started 12 Jan 2026 08:32, by Sixten
476 Views
Last Post by sf4t7 13 Jan 2026 16:13
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