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Kz1000B4 Ground Up.

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13 Apr 2016 10:45 #720736 by DobbinsCMA
Replied by DobbinsCMA on topic Kz1000B4 Ground Up.
Time to start over!


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'80 Kz1000B4
MTC 1075 .375 webcams Mikuni RS34
KZ440 Project
81'KZ750E2 Project
Past- '81 Kz750H :(
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  • DoctoRot
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  • Oh, the usual... I bowl, I drive around...
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14 Apr 2016 13:37 #720966 by DoctoRot
Replied by DoctoRot on topic Kz1000B4 Ground Up.
Ouch. any insight into what you think the cause was?

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16 Apr 2016 16:51 #721289 by DobbinsCMA
Replied by DobbinsCMA on topic Kz1000B4 Ground Up.
No rev limiter, geared real low, stock springs because they were in spec, and too much pride on the high way with passenger.

'80 Kz1000B4
MTC 1075 .375 webcams Mikuni RS34
KZ440 Project
81'KZ750E2 Project
Past- '81 Kz750H :(

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16 Apr 2016 17:06 #721294 by TexasKZ
Replied by TexasKZ on topic Kz1000B4 Ground Up.
Dayum :pinch:

1982 KZ1000 LTD parts donor
1981 KZ1000 LTD awaiting resurrection
2000 ZRX1100 not ridden enough

www.kzrider.com/11-projects/620336-anoth...uild-thread?start=24

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20 Apr 2016 11:00 - 20 Apr 2016 11:01 #722018 by Dr. Gamma
Replied by Dr. Gamma on topic Kz1000B4 Ground Up.

DobbinsCMA wrote: Time to start over!


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Looks like dentonation to me. When the hole in the piston looks like it was done with a torch, that's pre-ignition. If the hole has jagged edges that's dentonation. Is the timing dead on?? Pump gas??

See if the top rings in the undamaged pistons are stuck in their grooves. Dentonation usually collapses the top ring land groove. Higher compression pistons and more lift and duration, I always go to like a B9ES sparking plug. Too much timing and pump gas will cause dentonation for sure. I set my advance unit to crank with a degree wheel. Loosen the advance unit bolt, and see how much it moves side to side!!! Bet it like 10 degrees or so!!!!

Pilot fuel /air screws by my RS Mikuni manual say you can set them from 1/8 turn out to like 1 1/2 turns out!!

1972 H2 750 Cafe Racer built in 1974.
1976 KH400 Production Road Racer.
1979 Kz1000 MK. II Old AMA/WERA Superbike.
1986 RG500G 2 stroke terror.
1986 GSXR750RG The one with the clutch that rattles!

Up in the hills near Prescott, Az.
Last edit: 20 Apr 2016 11:01 by Dr. Gamma. Reason: kan't speell

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25 May 2017 11:36 #762704 by DobbinsCMA
Replied by DobbinsCMA on topic Kz1000B4 Ground Up.
Def was a valve that hit it. The valves on two other cyclenders were touched a little and the piston have a littlw,mark. Well its rebuilt again haha leaking oil from places but I havent gone through and torqued all bolts to spec using my FSM. Most just guessed. I know my valve cover bolt is stripped. That was a fun find. I have some leaky fuel from my carbs too. I have to check the plugs too.

'80 Kz1000B4
MTC 1075 .375 webcams Mikuni RS34
KZ440 Project
81'KZ750E2 Project
Past- '81 Kz750H :(

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25 May 2017 11:38 #762705 by DobbinsCMA
Replied by DobbinsCMA on topic Kz1000B4 Ground Up.
Here it is

'80 Kz1000B4
MTC 1075 .375 webcams Mikuni RS34
KZ440 Project
81'KZ750E2 Project
Past- '81 Kz750H :(
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25 May 2017 11:42 #762706 by DobbinsCMA
Replied by DobbinsCMA on topic Kz1000B4 Ground Up.
Ha the tach cable wasnt meant to be a forever fix. Ill have to think of soemthing for that.

'80 Kz1000B4
MTC 1075 .375 webcams Mikuni RS34
KZ440 Project
81'KZ750E2 Project
Past- '81 Kz750H :(
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27 May 2019 01:17 #804661 by DobbinsCMA
Replied by DobbinsCMA on topic Kz1000B4 Ground Up.
Running well but allas there is an head gasket leak. Upon start up, it blows smoke from where the head meets the jugs on the left side. I think it seals up when it warms and the head bolts are all at 75, the recommended tightness for APE studs. Should i tighten them stone cold? Could extreme cold mess with this as I did store the bike in my hangar and it got -32 f this year. Also it is a copper HG with copper spray. Maybe i didnt spray it enough?

'80 Kz1000B4
MTC 1075 .375 webcams Mikuni RS34
KZ440 Project
81'KZ750E2 Project
Past- '81 Kz750H :(

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27 May 2019 01:21 #804662 by DobbinsCMA
Replied by DobbinsCMA on topic Kz1000B4 Ground Up.
also my RS-34 is leaking gas from the left most carb (carb 1). I broke them down and cleaned the whole carb, even setting the carb float to 17mm, but to no avail. I ordered new Needle Valve & Needle Seat N149.040 007-143 for that one carb so hopefully it works.

'80 Kz1000B4
MTC 1075 .375 webcams Mikuni RS34
KZ440 Project
81'KZ750E2 Project
Past- '81 Kz750H :(

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27 May 2019 22:10 #804689 by DobbinsCMA
Replied by DobbinsCMA on topic Kz1000B4 Ground Up.
Plus a new project!

'80 Kz1000B4
MTC 1075 .375 webcams Mikuni RS34
KZ440 Project
81'KZ750E2 Project
Past- '81 Kz750H :(
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