frankbarb

Hi Harry, I am rebuilding a 1999 1100stx Motor. The motor need new pistons and a bore so I was thinking of cleaning and matching
up the Exhaust manifold to the Cyl. This is a stock ski is it worth the effort.
also what specs should I use for the piston clearance. I am using Weisco 81mm
pistons.

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2003 - Ultra 150
1999 - STX 1100
1988 - X2 - Winter project
1993 - 750 SX
1989 - 650 SX - 750 Small pin Ported 44 Buckshots, WC Pipe,Solas Prop, ETC
1996 - ZXI 900 RIP
1989 - 650 TS

Group K

Frank,
The ex manifold matching is always nice to do.... but on a stocker won't make a "big" difference. For a stock 1100, you get the biggest bang for the buck by milling the head (we do it for $190) to get 150-160 psi. The boring is a great idea .... .004" clearance is good with a long (2 hour) break-in.

DO NOT raise the exhaust ports on your 1100 cylinder. Also, if you have the CV carbs KEEP the entire stock flame arrestor.

Respectfully, Harry Klemm

__________________
Unless otherwise stated, responses to all forum posts are based on my personal experiences working within the PWC industry, and developing high performance PWCs since 1987.

www.groupk.com

frankbarb

Thanks Harry, Iam going to pickup a extra head and send it out after I put some time on. I also have a zxi 900 that my buddy Big Wave Dave milled the head on. This Woke up the ski right up... BTW why the stock flame arrestor.

__________________
2003 - Ultra 150
1999 - STX 1100
1988 - X2 - Winter project
1993 - 750 SX
1989 - 650 SX - 750 Small pin Ported 44 Buckshots, WC Pipe,Solas Prop, ETC
1996 - ZXI 900 RIP
1989 - 650 TS

Group K

The CV type carbs used on later 1100s "need" the restriction of the stock flame arrester to have the right signal strength to meter safely at 70% throttle. With free-er breathing aftermaket arrestors, you will develop a 70% throttle lean condition that cannot be jetted out.

Respectfully, Harry Klemm

__________________
Unless otherwise stated, responses to all forum posts are based on my personal experiences working within the PWC industry, and developing high performance PWCs since 1987.

www.groupk.com

frankbarb

Thanks Harry......

__________________
2003 - Ultra 150
1999 - STX 1100
1988 - X2 - Winter project
1993 - 750 SX
1989 - 650 SX - 750 Small pin Ported 44 Buckshots, WC Pipe,Solas Prop, ETC
1996 - ZXI 900 RIP
1989 - 650 TS

Nefarious

Harry,
I noticed you said not to raise port timing. Why is that?

__________________

Group K

1100s are basicly a 750 with another cylinder added. The 1100s carry "alot" more exhaust port timing than any standup .... and in my minds eye, the ragged edge of what is needed or benificial.

Respectfully, Harry Klemm

__________________
Unless otherwise stated, responses to all forum posts are based on my personal experiences working within the PWC industry, and developing high performance PWCs since 1987.

www.groupk.com

Nefarious

Thanks for the info.

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