I got mine today! Actually, it's for my older brother.
Thanks Mark!
Thanks Mark!
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Show posts MenuQuote from: teazer on October 30, 2023, 07:02:47 PMWhen you press it out, check the shape of the O ring groove. It should be a square cross section to allow the round ring to deflect (squish) into the space and allow it to seal. if the groove is round it won't seal. Banshee inserts are usually machined correctly.Yep, it has a square cross section.
Quote from: teazer on October 28, 2023, 09:59:53 PMI have TZ heads with inserts and GT750 head with inserts (domes) and sealing them can be problematic. TZ is easy because it doesn't need a head gasket - just O rings. the GT is a different story and it uses an oversized gasket that the insert fits through and seals with o rings. best solution is BDK in the UK who do all O rings.No head gasket. I used Permatex Motoseal gasket maker. I looked at the head surface after taking it off. The seal or sealant looked got and no signs of leaking. It was just the top of the boss where it inserts in the head.
The second source of leaks is the same issue as here, sealing the insert against the shell of the head. Stock heads rarely have sufficient material to seal effectively with an O ring round the dome, like that Banshee dome. That's how Polaris and others used to seal their sled heads. And there's barely enough material to seal on teh top face of the insert against that flat surface, but that's all you have.
The reason they are a press fit in the head is probably to try to seal the head to the cylinder. They should not need to be a press fit in the head shell. Can you tell us what sort of head gasket you are using and what does the top of that insert look like?
Quote from: 1976RD400C on October 28, 2023, 05:07:56 PMHow about flipping it over and pressing it out from the other side?
Quote from: rodneya on October 25, 2023, 11:56:04 PMThat mod started on banshee heads so that guys could run different cc domes and 4 mil cranks and still keep the motor looking completely stock. Now stealth coolheads that look just like stockers are available that have orings to seal so you dont really see stock heads being cut up anymore.Thanks for the information. I may have to look into Wicked.
There are a lot less choices for RZ's though. Wicked and the place in Spain are the only ones Ive seen lately.
Quote from: 85RZwade on October 25, 2023, 10:08:25 AMWell, this is a new one for me; I haven't seen an OEM head modified for a removable dome before. I thought, from your first picture, that your head must be cracked! I think Mark's idea is on the money.I have never seen that either. To be honest I was surprised to see that mod when I got the motor back. I had no knowledge that was going to happen. (another story)
Who did the head mod?
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