Individual / single heads from another Yamaha

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David de Botton
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Individual / single heads from another Yamaha

#1 Post by David de Botton » Mon Dec 11, 2017 6:56 am

What other heads can be used as an individual cylinder head.
YZ125
TZR250 ?
Stud pattern looks the same

Cheers

Ade SYM
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Joined: Wed Sep 15, 2010 4:48 pm
Location: Lecicestershire

Re: Individual / single heads from another Yamaha

#2 Post by Ade SYM » Mon Dec 11, 2017 10:26 am

David de Botton wrote:What other heads can be used as an individual cylinder head.
YZ125
TZR250 ?
Stud pattern looks the same

Cheers
I believe the TZR250 3XV SP ones will work but there is a little work to be done on the waterways. But good luck in finding a full set of 4 as i have been looking for a while!
Thanks Ade

Vinpg
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Re: Individual / single heads from another Yamaha

#3 Post by Vinpg » Tue Dec 12, 2017 1:08 am

Not being nosey but what's the end game? Looking for head mod?

Ron57
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Re: Individual / single heads from another Yamaha

#4 Post by Ron57 » Wed Dec 13, 2017 5:38 am

Hi came across these billet heads on ebay.
https://www.ebay.com/itm/RZ500-RD500-RZ ... Sw42dZDWTc" onclick="window.open(this.href);return false;

BigGuy
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Re: Individual / single heads from another Yamaha

#5 Post by BigGuy » Wed Dec 13, 2017 9:39 am

Ron57 wrote:Hi came across these billet heads on ebay.
https://www.ebay.com/itm/RZ500-RD500-RZ ... Sw42dZDWTc" onclick="window.open(this.href);return false;
Hi, sorry to hijack. I've also noticed those heads and wondered what advantage they are over the stock ones? Anyone have these fitted and if so why? Just curious.
Shake "N" Bake!

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ns86
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Location: ontario canada

Re: Individual / single heads from another Yamaha

#6 Post by ns86 » Wed Dec 13, 2017 1:21 pm

One of the Costin/Micoproducts bikes if I recall correctly. Awesome looking and the cooling circuit is improved also. Busy plowing out from a snowstorm but I can try and find it later
1985 RZ500
1986 RG500
1986 RG500 C
1992 RGV500 WW ATR
1992 RGV500 LS
1985 NS500 Spencer p
1989 TZR500 Biaggi p
1984 RZV500 Rainey p
1994 NSR250sp R
1983 NS250 p
1987 RG250 WW p
1983 RG250 p
1988 YSR50 p

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Jeff B
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Location: Wisconsin

Re: Individual / single heads from another Yamaha

#7 Post by Jeff B » Wed Dec 13, 2017 3:25 pm

ns86 wrote:and the cooling circuit is improved also.
I'd like to see proof of that. I just don't see how the upper cylinders would push coolant down into the jugs any better than stock. Especially without the headgaskets that the stock heads use to help control flow. It does appear to be well made and has other advantages over stock.

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phildu31
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Location: Toulouse France

Re: Individual / single heads from another Yamaha

#8 Post by phildu31 » Wed Dec 13, 2017 7:13 pm

In the upper/rear cylinders, coolant enters at the center of the heads.
I can't see this in these heads !

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ns86
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Location: ontario canada

Re: Individual / single heads from another Yamaha

#9 Post by ns86 » Wed Dec 13, 2017 10:41 pm

I always thought these are 3ma sp heads not 3xv's which are quite different. One year only 1990 sp version, so very rare. Pretty sure this is Mick Costin's Doohan NSR500 engine with the modded 250 sp heads

Image

Image

Image

Image
Last edited by ns86 on Thu Dec 14, 2017 1:45 am, edited 5 times in total.
1985 RZ500
1986 RG500
1986 RG500 C
1992 RGV500 WW ATR
1992 RGV500 LS
1985 NS500 Spencer p
1989 TZR500 Biaggi p
1984 RZV500 Rainey p
1994 NSR250sp R
1983 NS250 p
1987 RG250 WW p
1983 RG250 p
1988 YSR50 p

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ns86
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Location: ontario canada

Re: Individual / single heads from another Yamaha

#10 Post by ns86 » Thu Dec 14, 2017 12:21 am

Other heads I have seen include the individual set of 4 on eBay from aikasot64. Gus [ the crank guy] had a one piece billet unit like the stock ones with removable domes a few years back. Once again If? I recall correctly. I have also seen sets of 4 from a company called Sodertal Racing?

Image

These may be from Gus? His were similar to these.

Image

Not sure about these? Similar to aikasot64 Image
Image

Individual heads on eBay from aikasot64 https://www.ebay.ca/itm/RZ500-RD500-RZ- ... 0005.m1851" onclick="window.open(this.href);return false;

And a complete conversion kit if you have not seen his stuff.

https://www.ebay.ca/itm/RZ500-RD500-RZ- ... 0005.m1851" onclick="window.open(this.href);return false;
1985 RZ500
1986 RG500
1986 RG500 C
1992 RGV500 WW ATR
1992 RGV500 LS
1985 NS500 Spencer p
1989 TZR500 Biaggi p
1984 RZV500 Rainey p
1994 NSR250sp R
1983 NS250 p
1987 RG250 WW p
1983 RG250 p
1988 YSR50 p

RC45
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Re: Individual / single heads from another Yamaha

#11 Post by RC45 » Thu Dec 14, 2017 1:21 am

3MA SP heads are one source- - that's what the engine in the Costin YZR use. Or George (of the dry clutch kit fame) from Greece - the Bay auction.

I just think they look the part and are of course lighter.
CBR1000RR SP2 HRC WSBK
TZ500V/OW53 Track bike
YZR500 OW81 Clone
OW69 Daytona 200 Replica - 784cc Monster
NS400 Track Bike
RS250R NF5
TZ250T 2KM
TZ250B 3YL
TZR250 3MA Track Bike
427ci C5 Z07

jeff10
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Re: Individual / single heads from another Yamaha

#12 Post by jeff10 » Fri Dec 15, 2017 9:11 am

Originally Costin used DT125 heads ; not sure of the head gasket arrangement though .
The genuine / aftermarket headgaskets are somewhat shit ( big time ) and really f*****g expensive . A better alternative is splitting the originals & O ringing the cylinders . The coolant runs between the front of the cylinder banks and exits thru the bottom cylinder inlets & between the uppers .The bike in question needs a GSXR 1000 radiator to cope with the foolishness . Pictures to follow .
Sorry for the tease .. engine is coming out for frame mods & I shall post / explain the logic & execution .
Coolant inserted at exhaust ; thru the heads exiting rear of barrels ...
A .Graham Bells ( & mine ) wet dream .

Vinpg
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Re: Individual / single heads from another Yamaha

#13 Post by Vinpg » Thu Dec 21, 2017 3:32 am

Yes I did and am again making the 1 piece Billit head again, and I believe they have a lot more cooling capacity over stock, in January I'm gonna machine up 20 sets. Gus

RC45
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Re: Individual / single heads from another Yamaha

#14 Post by RC45 » Thu Dec 21, 2017 7:30 pm

Vinpg wrote:Yes I did and am again making the 1 piece Billit head again, and I believe they have a lot more cooling capacity over stock, in January I'm gonna machine up 20 sets. Gus
Now this is tempting.
CBR1000RR SP2 HRC WSBK
TZ500V/OW53 Track bike
YZR500 OW81 Clone
OW69 Daytona 200 Replica - 784cc Monster
NS400 Track Bike
RS250R NF5
TZ250T 2KM
TZ250B 3YL
TZR250 3MA Track Bike
427ci C5 Z07

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ns86
Posts: 833
Joined: Sat Oct 30, 2010 9:46 pm
Location: ontario canada

Re: Individual / single heads from another Yamaha

#15 Post by ns86 » Thu Dec 21, 2017 8:29 pm

Gus, do you have a price for a set yet?
1985 RZ500
1986 RG500
1986 RG500 C
1992 RGV500 WW ATR
1992 RGV500 LS
1985 NS500 Spencer p
1989 TZR500 Biaggi p
1984 RZV500 Rainey p
1994 NSR250sp R
1983 NS250 p
1987 RG250 WW p
1983 RG250 p
1988 YSR50 p

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