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Author Topic: Can't keep coolant in radiator  (Read 1509 times)

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Re: Can't keep coolant in radiator
« Reply #25 on: July 03, 2013, 03:03:01 pm »
Quote from: Dezsled on July 02, 2013, 03:48:07 pm
I just had the '88 cyl head /cyl modified by Jerry. He can machine out imperfections up to a point then your head becomes a conversation piece. It's not cheap as the coolant passages are reduced on the exhaust side, squish /dome modified, sealing surface milled flat, oring lands machined in. It came with orings. Expect to spend two Benjamin's  +k2

Yes its money well spent and a critical mod/upgrade for the 500's. Send it to Jerry............
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Re: Can't keep coolant in radiator
« Reply #26 on: July 04, 2013, 06:21:17 am »
I will get hold of Jerry after the holiday. I have a spare head that I cxan send him. Looks to have only minimal damage to the gasket surface.

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1999 Honda 400ex
1997 Yamaha Banshee
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Re: Can't keep coolant in radiator
« Reply #27 on: July 04, 2013, 03:05:22 pm »
Jerry, I think I remember you talking about heli-coils for head studs to repair damaged threads.
Is that the thread insert you prefer for head studs?
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Re: Can't keep coolant in radiator
« Reply #28 on: July 05, 2013, 08:07:41 am »
This is the extra head I have.




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1999 Honda 400ex
1997 Yamaha Banshee
1994 Polasis Sportsman 400
1989 Suzuki LT250R Quadracer
1987 Suzuki LT500R Quadzilla
1982 Yamaha YZ125
Buncha more cool stuff

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Re: Can't keep coolant in radiator
« Reply #29 on: July 05, 2013, 08:31:53 am »
Quote from: WestTexasKing on July 04, 2013, 03:05:22 pm
Jerry, I think I remember you talking about heli-coils for head studs to repair damaged threads.
Is that the thread insert you prefer for head studs?

I prefer Heli-Coils to repair threads in aluminum.  We see too many problems with "Time sert or Keen Sert" staying in place. 
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Re: Can't keep coolant in radiator
« Reply #30 on: July 05, 2013, 08:34:12 am »
Quote from: Mtsnieg on July 05, 2013, 08:07:41 am
This is the extra head I have.




The head looks like it would be a good head after the gasket surface is machined.  You may have problems with the head gasket sealing on this head gasket surface. 


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Re: Can't keep coolant in radiator
« Reply #31 on: July 05, 2013, 09:40:31 am »
Im not using this head now. Its an extra that came with the Z when I bought it.  If this head is a good canidate for you to work on on I dont have to to rip apart the Z right away.
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1999 Honda 400ex
1997 Yamaha Banshee
1994 Polasis Sportsman 400
1989 Suzuki LT250R Quadracer
1987 Suzuki LT500R Quadzilla
1982 Yamaha YZ125
Buncha more cool stuff

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Re: Can't keep coolant in radiator
« Reply #32 on: September 27, 2013, 07:00:01 am »
Problem fixed. I sent the head to Jerry to be o-ringes and the squish fixed. Top notch work there! The last head stud on final torque pulled up in the head. Un believable. I checked them for holding torque before I sent it to HPR, and HPR checked too. Called them up and was told how to fix. Lucky I have a friend close by with a mill and a nice assortment of heli coils.
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1999 Honda 400ex
1997 Yamaha Banshee
1994 Polasis Sportsman 400
1989 Suzuki LT250R Quadracer
1987 Suzuki LT500R Quadzilla
1982 Yamaha YZ125
Buncha more cool stuff
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