Z1OwnersClub GB

Posted: **Tue Jul 19, 2011 9:54 pm**

Can anyone tell me what the largest bore size is that i could go to without resleeving

Posted: **Wed Jul 20, 2011 4:38 am**

The standard 1089cc block (72.5mm bore) can be taken out to 1170cc (75mm bore) and doesn't require the crankcases to be opened out.

Posted: **Wed Jul 20, 2011 11:37 am**

MANY THANKS !

Posted: **Wed Jul 20, 2011 12:01 pm**

london calling wrote:The standard 1089cc block (72.5mm bore) can be taken out to 1170cc (75mm bore) and doesn't require the crankcases to be opened out.

Wiseco only list a max capacity of 1105 though for that motor (73mm bore) :roll:

Posted: **Wed Jul 20, 2011 3:13 pm**

Will,
I don't want to start a row, but this is what I found listed for a 1984 KZ1100;

Part Number Price Boresize OverSize Attributes
4302M07500 $155.28 75.00mm 2.50mm Compression Ratio - Actual: 10.25:1
Displacement: 1170cc
Stroke: 66.20mm
Notes: Cylinder boring required

4380M07500 $155.28 75.00mm 2.50mm Compression Ratio - Actual: 9.5:1
Displacement: 1170cc
Stroke: 66.20mm
Notes: Cylinder boring required

4304M07800 $155.28 78.00mm 5.50mm Compression Ratio - Actual: 10.25:1
Displacement: 1262cc
Stroke: 66.20mm
Notes: Cylinder sleeving required

http://www.wiseco.com/ProductSearch.aspx

Posted: **Fri Jul 22, 2011 11:53 am**

My 84 1100r has been bored to 1170 with 9.5:1 wiseco pistons.
Though despite the head also being flowed it produces no more power than when it was stock (measured on the same dyno).
So if you're looking for more power I guess you need to use the 10.5 pistons and change the cams and carbs
Guess I'll have to go for a 1325/1428 big block next :lol:

Brian

Posted: **Fri Jul 22, 2011 7:07 pm**

For the 1089 - 1170 is safest max :wink:

Z1OwnersClub GB

Z1100R 1984 BORE SIZE

Z1100R 1984 BORE SIZE