TOPIC:

My 1100 engine internals are stock.
Are alternative mild camshafts available for stock J-motors, w/BS34 carburetors?

...

I know you can buy aftermarket cams for the j model 1000s. i believe you could use any 1000 cams in them. Just have to keep a eye on the tach drive gear on the cams and change sprockets. But not sure if they will work in the 1100s.

GPz 1100 cams will work - do you have the cam specs for the 1100-A2?

OnkelB

I have absolutely no knowledge of that. If engine performance can be improved by putting another set in the head without compromising engine life or changing anything else, I'd consider doing something. Just wondering what options are available.

Thanks...

You're welcome. Just asked for the specs for comparison with the GPz cams - I checked Kawasaki.com and your bike uses the same cams as most of the 1000P (Police) J's.

The 81 Gpz (KZ 1100-B1) will be slightly hotter, 82 GPz (KZ 1100-B2) a little hotter than the 81 and 83 and up GPz (ZX 1100) will be the hottest.

You may need to swap the cam sprockets and there may be some issues with the tach drive (the GPz's have electronic tach = no worm gear for the tach drive, not sure if your bike has a cable driven tach?), other than that it should be pretty much plug and play.

It's getting late over here now, but I'll post some numbers tomorrow after work.

Okay, here are some numbers for comparison - if anyone has the specs for the 12044-1027 cams please post them.


1982 KZ1100-A2, rated as 92 hp:

Intake (12044-1027):

Duration: 270 - Lift: Not exactly sure, but a little less than the 81 GPz.

Exhaust:

Duration: 270 - Lift: Not exactly sure, but a little less than the 81 GPz.

Used on:

KZ1000-K1 (LTD) (1981)
KZ1000-K2 (LTD) (1982)
KZ1000-M1 (CSR) (1981)
KZ1000-M2 (CSR) (1982)
KZ1000-P1 to P24 (Police 1000) (1982 - 2005)
KZ1100-A1 (Shaft) (1981)
KZ1100-A2 (Shaft) (1982)
KZ1100-A3 (Shaft) (1983)
KZ1100-D1 (Spectre) (1982)
KZ1100-D2 (Spectre) (1983)
KZ1100-L1 (LTD Shaft) (1983)
ZN1100-B1 (LTD Shaft) (1984)
ZN1100-B2 (LTD Shaft) (1985)



1981 KZ1100-B1 Gpz, rated as 102 hp:

Intake (12044-1031):

Duration: 280 - Lift: 8,4 mm (.330") - Open: 35 BTDC - Close: 65 ABDC

Exhaust (12044-1036):

Duration: 280 - Lift 8,8 mm (.346") - Open: 68 BBDC - Close: 32 ATDC

Used on:

KZ1000-J1 (1981)
KZ1000-J2 (1982)
KZ1000-J3 (1983)
KZ1000-R1 (Eddie Lawson Replica) (1982)
KZ1100-B1 (GPz) (1981)



1982 KZ1100-B2 GPz, rated as 109 hp:

Intake (12044-1037):

Duration: 288 - Lift: 8,8 mm (.346") - Open: 34 BTDC - Close 74 ABDC

Exhaust (12044-1037):

Duration: 288 - Lift: 8,8 mm (.346") - Open 72 BBDC - Close 36 ATDC

Used on:

KZ1000-R2 (Eddie Lawson Replica) (1983)
KZ1100-B2 (GPz) (1982)



1983/84 ZX1100-A1/A2 GPz, rated as 120 hp:

Intake (12044-1057):

Duration: 300 - Lift: 9,6 mm (.375")

Exhaust (12044-1057):

Duration: 300 - Lift: 9,6 mm (.375")

Used on:

ZX1100-A1 (GPz) (1983)
ZX1100-A2 (GPz) (1984)

OnkelB

That is a lot of information on cams. Would all of them work in place of the 12044-1027, without having to alter or change anything else on the engine, other than changing valve shims?
In other words, just bolt-in and go!!!

Powerstroke_fan

Any info about aftermarket 1000-J cam applications, relative to the 1100-J engine?

I gotta think there is an alternative...

After all, I mounted their header when V&H told me it "would NOT work". Boy were they wrong!
Albeit did require a squish/twist to the footrest mounting bracket, and a spacer on the slip-fit.

daveo wrote: Would all of them work in place of the 12044-1027, without having to alter or change anything else on the engine, other than changing valve shims?
In other words, just bolt-in and go!!!

Basically, yes, unless you want to degree the cams (in which case you'll need slotted/adjustable cam sprockets). In any case you will need to insure that the cam sprockets are mounted correctly and obviously that the cams are installed accordingly - the 82, 83 and 84 GPz's use identical cams for intake and exhaust, the orientation of the sprockets determine which is which.

daveo wrote: Powerstroke_fan

Any info about aftermarket 1000-J cam applications, relative to the 1100-J engine?

I gotta think there is an alternative...

After all, I mounted their header when V&H told me it "would NOT work". Boy were they wrong!
Albeit did require a squish/twist to the footrest mounting bracket, and a spacer on the slip-fit.

I dont really know alot. Iam running a J model head on a kz bottom end. Iam running kz cams in it with ape sprockets. I didnt run into any problems from switching cams but mine is a 81 with a tach drive. So iam not sure if the later models have the groove cut out in the heads where you could a run a kz cam with tach gears, or if it would rub. I could be wrong but i was once told that you can buy aftermarket sprockets to run the kz cams. But iam not sure on any of that. I have never attempted it or looked into, Just know what i ran into on mine.

I see the valve springs are a different part # for the GPZ vrs the LTD/ CSR etc.
APE sells a good replacement valve spring for the extra lift, I put those in mine.