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Z2 750 crank (Bossie the Kaw)
- SWest
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- 10 22 2014
Steve
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- Tyrell Corp
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I cant find nos old design wiseco rings for my GPz615 so I'm going to have to risk it and use 'quick seat' lube from total seal and some running-in oil.
Maybe check your installed ring gap to match the pistons to the bores as best you can, there is often a measureable difference - 4 thou on my last used set.
1980 Gpz550 D1, 1981 GPz550 D1. 1982 GPz750R1. 1983 z1000R R2. all four aces
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- RODZ
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Go big!swest wrote: It was a used set I got on eBay. Great shape, wasn't planning on using the pistons, that's when I found I lunched one of my good ones. I put it one used rings and all with a light hone. The bores have light scratches in them now. I honed them and they will work. I see a 1075 or 1105 in my future.
Steve
My curiosity : what kind of oil do you use?
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- SWest
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I'm using Rotilla oil.
I didn't want to use the old rings that came with the stock pistons but had no choice. The oil on the pistons is after two years of running. The bike ran like a scalded cat even tho it did have low compression. I figure with the 2.5mm drop, I was running at 7/7.5/1 compression. With these new pistons, I should be at around 9/9.5. Good enough for now.
Steve
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- SWest
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Good squish and combustion chamber design is worth a point in compression ratio all day imo. I think flatter top pistons have some advantages in an old- school design.
1980 Gpz550 D1, 1981 GPz550 D1. 1982 GPz750R1. 1983 z1000R R2. all four aces
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- SWest
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We'll see what it looks like tomorrow.
Steve
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- 80B4
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1980B4 1000
1978 Z1R
1978 B3 750
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- SWest
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Steve
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And when you get around to boring it out, the motor will become even more 'undersquare' .
What you lose in bottom end tourque I guess you could pick up more pm power.
Seems like with all that deck height you won't have any issues with valve/piston contact. Not sure if there are any other problems with the extra deck height. Valve to valve clearance seems very generous on mine. You could even get some slotted cam sprockets and tweak the valve timing for more overlap and some more retard for rpm power, or find hotter cams.
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www.hottr6.com/triumph/CamBasics.html
1980 Gpz550 D1, 1981 GPz550 D1. 1982 GPz750R1. 1983 z1000R R2. all four aces
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- SWest
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Steve
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