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TOPIC: Z2 750 crank (Bossie the Kaw)

Z2 750 crank (Bossie the Kaw) 17 Sep 2015 05:55 #690462

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Swest, keep up the good work, she is going to purrrr like a wildcat and ask for more!

(cheerleading on the sideline)
'79 KZ650B3 (stock)
'79 KZ650B3 (parts bike)
'06 HD 883R
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Z2 750 crank (Bossie the Kaw) 17 Sep 2015 07:44 #690485

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Thanks. Just came in for the gaskets. TTYL :woohoo:
Steve
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Z2 750 crank (Bossie the Kaw) 17 Sep 2015 17:18 #690588

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Now, that's more like it. Exhaust note is much deeper, pulls stronger in low end and fith gear but it's running lean. Popping at idle and at speed. hesitates, then pulls strong. Went to the local store for some cigs and a nip. Havn't had one for months. I left my camera in the shed. Pics to follow.
It lives! :woohoo:
Steve
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Z2 750 crank (Bossie the Kaw) 17 Sep 2015 17:49 #690595

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Cool. I just pulled my cam cover and checked all my torque specs n clearances. I was surprised to find I could turn a few cylinder nuts at +330-360 in lbs.
All valve/shims are between .003" and .004" so I'll leave it.
1156 miles now.
Bruce
1977 KZ1000A1
2016 Triumph T120 Bonneville
Far North East Metro Denver Colorado

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Z2 750 crank (Bossie the Kaw) 17 Sep 2015 17:54 #690596

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Buttoning her up.



Couple marks at the top I can't get out. I have no idea what caused them.


Bad idea. Got stuck in the bores. Had to get them out and use the clamps alone.


I was so pissed, I forgot to show the deck height. It was even.




Tired of the end caps leaking. Was going to turn them around so the blue would show but they were discolored over time in the head. Had Manly stamped on them. I don't like advertising for someone else I don't know.


Had two tight valves. Had to use the 205 shim but the 235 I had on the intake needed a 220 and I have .002 clearance. Time for more shims. You can see the bat wing sticking out.
Going back together.






I wanted to take more time on this but my truck wouldn't start. The battery took a dump. It always happens when the weather changes. I'll dial it in tomorrow.
Steve
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Z2 750 crank (Bossie the Kaw) 17 Sep 2015 18:03 #690598

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BTW, I got rid of the APE adjuster and put on my old stock manual adjuster. I don't trust it.
Steve
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Z2 750 crank (Bossie the Kaw) 18 Sep 2015 12:08 #690715

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Changed the pilots from 60 to 65's. Also went to 130 mains up from 125's. Lean condition gone. I know it's a no no but I had it that way before and I wanted to get to town and back with no problems. It's over 100 today, so when it cools off, I'll check the plugs. If too rich, I'll go back to the 125's. Easy on these carbs. Sediment cap over the mains. B)
Steve
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Z2 750 crank (Bossie the Kaw) 18 Sep 2015 13:08 #690730

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... Sediment cap over the mains.

So that is the reason for the rubber plug over the main jets?

Good to see it all getting buttoned up, nice to just do it rather than talking about it for years like me!

UK /USA translator: 'Nip', is that booze? :ohmy:
1980 Gpz550 D1, 1981 GPz550 D1. 1982 GPz750R1. 1983 z1000R R2. all four aces

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Z2 750 crank (Bossie the Kaw) 18 Sep 2015 14:25 #690733

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No, they have a cap under the mains like the early Z1's. Easy to switch jets but no overflows. The ring compressors would've worked if I didn't have as much sticking over the top. Next time I won't. The 903 bored didn't have a taper on the bottom, so getting the rings in I had to use beer can metal to take up that 1mm space between the clamp screw area. With these stock 1015 bores it got caught in the taper.
Live and learn. :whistle:
I've been talking about doing this for two years. :dry: I lunched a new piston within 2000 miles. I didn't clean the oil peep hole and ran it out of oil. My fault. :angry: The valve guide seals were puking oil into the cylinders. You wouldn't have known it. It didn't smoke except at start up. A puff of smoke, then it ran like a raped ape. Fouled plugs tho. Finally back to where I started in 13. Better, the KZ bores don't get as hot and now it has a new valve train. Time to roll. :woohoo:
I used to be a heavy drinker. Depression I guess. I had to stop. My daughter and granddaughter came back from Oregon, I missed 4 years of her life, :unsure: got the bike back on the road and have clocked more than 20,000 miles in two years going to visit them and riding up north on business. I'll take a nip (1/2 pint) on special occasions. Last night after I locked everything up and had dinner, I had my nip. I still have 1/2 left. Got a buzz and planned out what to do next.
They say the 33's are hard to get right. The pilots only come in .5 increments. Now that I have my jet drills, I can drill the 60's to 62.5 higher or lower. Three sizes in between. Allen's on the bowls and time to dial them in. B)
With what I learned from Miller so long ago, and the patience of an Oyster, I can finally get it right, Maybe. ;)
Steve




Bulbous filter I got from Z1E. :sick:

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Z2 750 crank (Bossie the Kaw) 18 Sep 2015 15:04 #690741

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Swest, I've got a couple of these Emgo filters . Seem to work fine and don't melt. The clamps that come with them are impossible to use, though, I just use zip ties.
1997 KZ1000P (P16)
2001 KZ1000P (P20)

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Z2 750 crank (Bossie the Kaw) 18 Sep 2015 15:15 #690743

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There's a special tool for those clamps. I've been using these for years. When I got those bulbous filters from Z1E I was pissed. The ones I run have a porous stone filter element and are clear so I can see if I'm getting any gas. The one shown above has a screen. Don't like it.
I got mine at the local Yamaha shop.
Steve

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Z2 750 crank (Bossie the Kaw) 18 Sep 2015 15:27 #690746

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swest wrote: There's a special tool for those clamps. I've been using these for years. When I got those bulbous filters from Z1E I was pissed. The ones I run have a porous stone filter element and are clear so I can see if I'm getting any gas. The one shown above has a screen. Don't like it.
I got mine at the local Yamaha shop.
Steve


The Emgo filters have the same kind of sintered bronze element, not a screen. You can clean them, too, so theoretically it's a one-time purchase. You could also use clear fuel hose, but it also has some of the same longevity problems that the see through filters do. Whatever works.
1997 KZ1000P (P16)
2001 KZ1000P (P20)

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Z2 750 crank (Bossie the Kaw) 18 Sep 2015 15:31 #690747

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I had these on the bike when I parked it for 15 years. Cleaned out the tank and ran them until I got new ones. Only issue is they can break if abused.
Steve
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Z2 750 crank (Bossie the Kaw) 18 Sep 2015 18:20 #690768

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Steve and a few of his buddies trying to decide if this is the crank he's been looking for to eliminate any question about the 750 crank possibly
installed previously...



Bruce
1977 KZ1000A1
2016 Triumph T120 Bonneville
Far North East Metro Denver Colorado
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Z2 750 crank (Bossie the Kaw) 18 Sep 2015 18:26 #690769

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Must stuck working in the heat... I couldn't stand it myself.

Lookin good man. You are still at stock bore? 1015 Weisco's?
If I knew what I was doing all the time life wouldn't be any fun.

'80 KZ650 E 700cc, dyna ignition and coils, frame up restoration, daily driver
'81 KZ1300 A3 full restoration, custom big bore pistons, 1400cc 6 cylinder super bike
"77 KZ650 B1 - Barn Find, work in progeress
"74 Yamaha DT 400 Enduro...

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Z2 750 crank (Bossie the Kaw) 18 Sep 2015 18:57 #690772

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The heat just started today. Swamp cooler is acting up, had a box fan this morning while doing my jets. I have lots of low end. Coming home I was behind a plumbing truck. He wouldn't let me by. Instead of dropping down, I just rolled on the throttle and passed him. Can't wait for 500 miles to come. Using the power up and down, changing speeds etc. Has a deeper growl to her.
Yeah, 1015 and 10.25/1 pistons but with the 2.5mm drop, I'll bet it's more like 9-9.5/1. Good enough for me. :whistle:
Steve
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Z2 750 crank (Bossie the Kaw) 18 Sep 2015 18:59 #690773

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missionkz wrote: Steve and a few of his buddies trying to decide if this is the crank he's been looking for to eliminate any question about the 750 crank possibly
installed previously...




:woohoo: Now that's a crank. :lol:
Steve
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Z2 750 crank (Bossie the Kaw) 19 Sep 2015 04:47 #690802

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What's the deck height on that :laugh: Some of these marine deisel engines are the size of a block of flats, quite amazing really.


Yeah, 1015 and 10.25/1 pistons but with the 2.5mm drop, I'll bet it's more like 9-9.5/1. Good enough for me

I think about 1 point drop in CR for every 1mm, so down about 2.5 points? 10.25 - 2.50 = 7.75

Is it 8.5: 1 standard? If your head has been skimmed at all that will get some back. If the exhaust valve timing lines are just a bit higher than the gasket face it is one indication that the head has been skimmed.

About 3% power for every point of CR, so I guess you are down less than 10 percent. They do run nice and smooth though you have noticed.




Attachment Compression_Power.gif not found





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Z2 750 crank (Bossie the Kaw) 19 Sep 2015 04:54 #690803

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I'm going to do a compression test just to see.
Steve
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Z2 750 crank (Bossie the Kaw) 19 Sep 2015 04:55 #690804

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A comp test at 500 and at thousand miles will tell you the real numbers. Mines at 165 last check so thinking its right at 10/1 or a hair under.

Whoops too slow. :laugh:
1978 KZ650 b-2
700cc Wiseco kit 10 to 1.
1980 KZ750 cam, ape springs, stock clutch/ Barnett springs.
Vance and Hines Header w/ comp baffle and Ape pods, Dyna S and green coils, copper wires.
29MM smooth bores W/ 17.5 pilots, 0-6s and 117.5 main
16/42 gearing X ring chain and alum rear JT sprocket....

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