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Heads and Cylinders All about your porting, compression, rings, cylinder and piston modifications to your bicycles engine

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Old 03-15-2017, 01:15 PM
dale_m dale_m is offline
Motorized Bicycle Newbie
Join Date: Feb 2017
Location: Canada
Posts: 1
Default Mixing cylinder bodies?

Hi all, I picked up a PK-style lower end (Z-L rod/low wrist pin piston combo) and I was wondering if anyone has ever made a GT5 cyl/head work on this bottom end with extra base gaskets? Or are the port timings too far off between the two? Looking to see if anyone has had success with this combo or if it's just a big waste of time. I tried to search and couldn't find anyone running this combo. Thanks for your input!
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Old 03-15-2017, 03:19 PM
crassius crassius is offline
Motorized Bicycle Elite Member
Join Date: Sep 2012
Location: USA
Posts: 3,071
Default Re: Mixing cylinder bodies?

this is always hard - one can measure height from base deck to head deck to determine how many gaskets and where, but then one must allow for that when measuring distances to ports to get that close to what it was

after that, there's the whole experimenting thing to see if moving gaskets around gives better or worse port timing

being old, I just start with matching stuff : (
Sometimes I sets and thinks, sometimes I jes sets.
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Old 03-16-2017, 06:20 PM
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sbest sbest is offline
Motorized Bicycle Elite Member
Join Date: Nov 2015
Location: Nova Scotia
Posts: 340
Default Re: Mixing cylinder bodies?

Yeah, like Crassius said!
I've swapped cylinders around using gaskets to make up the height difference.
I've also used basegaskets to play with port timing.
Got a bunch of heads with with different heights (I filed them) to get the squish gap right.

Experiment, play! You will learn lots.
That's a mighty noisy bike you got there, it must haul a lot of ass?
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gt5, pk80, skyhawk

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