83 gpz1100 cam compatibility

  • ned37
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83 gpz1100 cam compatibility

23 Aug 2019 10:51
#809693
tearing down my 83 gpz1100 to replace cyls back to stock. when i pulled the cams, the wear pattern on the bearing shells tells me the exhaust cam is bent. (i always thought it sounded a bit noisy).
i'll be looking for a replacement and if the gpz cam is hard to find (or comes too dear), is it possible to go with a kz set as an alternative. would the f.i. computer balk at it? is it a direct replacement? anybody have info about this?
'83 GPZ1100, '97 Triumph Trophy 1200, '08 Husky TE610
Verde Valley, AZ

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Re: 83 gpz1100 cam compatibility

23 Aug 2019 14:21
#809700
I did some measurements during my GPZ 1100 cam swap.
The GPZ1100 cams had a 28,25 - 28,30 mm base cycle (IN and EX cam). The Z1B IN cam had a 26,70 mm / the EX cam had a 27,45 mm base cycle.
So you need thicker shims if you want to run Z1 / KZ cams.

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Re: 83 gpz1100 cam compatibility

23 Aug 2019 15:49
#809704
I've got a good set of GPZ1100 cams if your interested.
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Re: 83 gpz1100 cam compatibility

24 Aug 2019 06:35
#809736
The Z1B IN cam had a 26,70 mm / the EX cam had a 27,45 mm base
?? i thought the cams were the same from intake to exhaust. what about an '82 kz1100?
'83 GPZ1100, '97 Triumph Trophy 1200, '08 Husky TE610
Verde Valley, AZ

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Re: 83 gpz1100 cam compatibility

24 Aug 2019 06:37
#809737
I've got a good set of GPZ1100 cams if your interested
pm me about it. thanks
'83 GPZ1100, '97 Triumph Trophy 1200, '08 Husky TE610
Verde Valley, AZ

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Re: 83 gpz1100 cam compatibility

24 Aug 2019 20:06
#809790
the wear pattern on the bearing shells tells me the exhaust cam is bent.

i rigged up a crude v-block setup and found the runout on the intake cam was less than .001"- lookin good. ( max allowed is .004)
when i did the exhaust, i expected it to be out of tolerance, but max appears to be around .003". but i'm tired (didn't get my nap) and will do it again tomorrow.
'83 GPZ1100, '97 Triumph Trophy 1200, '08 Husky TE610
Verde Valley, AZ

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Re: 83 gpz1100 cam compatibility

25 Aug 2019 17:18
#809845
.00325 it is, so i guess that's what new cam bearing shells look like after 500 miles with a slightly bent cam.
all the journals are within spec, too.
'83 GPZ1100, '97 Triumph Trophy 1200, '08 Husky TE610
Verde Valley, AZ

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