83-84 GPZ 1100 cams

I love the way my 1150 11:1 runs from 3000revs and up. It pulls like a monster. I have a bit of a fat lower end so i have some popping until I get to 3K when everything starts to happen. Even with the high gearing I have it wants to bring the front end up once it hits that 3K+ range. I have run a few different combinations over the years and this one by far has the most power for its size. But also this is the first engine I have built with a Bathtub head, and ported at that. This thing flows like crazy and is not over carbureted.

GPZ750 cams have no tach drive either they use electric tachs. There is a line on the exhaust cam that lines up with the flat part of the head on the exhaust cam and just dots on the exhaust & intake but no flat line on the exhaust at least thats the way my 82 GPZ750 is.

GPz750 cams. Intake on the left, exhaust on the right.

Buda has a 82 "J" series 1000/1100 motor. That is what we are covering here. The 650/750 cams are totally different and will not work. The configuration of the cams is also completely different. The cams he was asking about are GPz1100 cams. These are not even close to the GPz750 cams. The 750 cams are physically much smaller in every way.

otakar wrote:

Buda has a 82 "J" series 1000/1100 motor. That is what we are covering here.

My bad.

guitargeek wrote:

otakar wrote:

Buda has a 82 "J" series 1000/1100 motor. That is what we are covering here.

My bad.

Don't feel bad, I just know what he has. He may have been a bit more specific in his title. Such as " 83/84 GPz1100 cams" That is actually what he was asking about. He got himself a set of the hottest cams ever put on that motor from the factory and is trying to put them on an earlier motor.

Sorry for the confusion..but the cams are working out very nice. Way hotter than the j cams I had in it before.

FYI 1983 / 1984 GPZ 1100 cam specs:

INTAKE CAM .354 lift 238 deg

EXHAUST CAM .338 lift 239 deg

hope this helps.
Barry

That sounds a bit too mild to me. I thought the intakes were much closer to .380. If that is the case than they could easily be used as drop in cams for any KZ900/1000 1973-80 just by using a APE conversion sprocket and not requiring any grinding on the KZ head at all. My Yoshimura Bonneville cams that i put in my Z1R had a .360 lift with no head mod requirements.

Me too, thought they were.385.

DFIGPZ wrote:

FYI 1983 / 1984 GPZ 1100 cam specs:

INTAKE CAM .354 lift 238 deg

EXHAUST CAM .338 lift 239 deg

hope this helps.
Barry

The Megacycle diagrams tend to agree with you. I know that the standard "J" series intake cams are about .330 because I just measured them. These came from an CSR, that I just measured. Boy that makes me feel really radical, running .420 intakes and .410 exhausts. with 38.5mm intake valves, on my every day rider.

It is a good drop in cam for Z1 900 or KZ1000 stock Z1 900 cam specs :

INTAKE 327 lift ? 237 dur
EXHAUST 296 lift / 229 dur

also you have to remember 83/84 GPZ 1100 had the highest flowing stock cyl head available, also had to run within the constaints of the DFI system and the factory redline was 9,500 rpm. so in other words it DID NOT need extreme cam size on account of head flow. This made for a wide broad power curve. hope this makes it understandable .
Barry