Individual / single heads from another Yamaha
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Individual / single heads from another Yamaha
What other heads can be used as an individual cylinder head.
YZ125
TZR250 ?
Stud pattern looks the same
Cheers
YZ125
TZR250 ?
Stud pattern looks the same
Cheers
Re: Individual / single heads from another Yamaha
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!David de Botton wrote:What other heads can be used as an individual cylinder head.
YZ125
TZR250 ?
Stud pattern looks the same
Cheers
Thanks Ade
Re: Individual / single heads from another Yamaha
Not being nosey but what's the end game? Looking for head mod?
Re: Individual / single heads from another Yamaha
Hi came across these billet heads on ebay.
https://www.ebay.com/itm/RZ500-RD500-RZ ... Sw42dZDWTc" onclick="window.open(this.href);return false;
https://www.ebay.com/itm/RZ500-RD500-RZ ... Sw42dZDWTc" onclick="window.open(this.href);return false;
Re: Individual / single heads from another Yamaha
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.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;
Shake "N" Bake!
Re: Individual / single heads from another Yamaha
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
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
Re: Individual / single heads from another Yamaha
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.ns86 wrote:and the cooling circuit is improved also.
Re: Individual / single heads from another Yamaha
In the upper/rear cylinders, coolant enters at the center of the heads.
I can't see this in these heads !
I can't see this in these heads !
Re: Individual / single heads from another Yamaha
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
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
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
Re: Individual / single heads from another Yamaha
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?
These may be from Gus? His were similar to these.
Not sure about these? Similar to aikasot64
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;
These may be from Gus? His were similar to these.
Not sure about these? Similar to aikasot64
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
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
Re: Individual / single heads from another Yamaha
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.
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
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
Re: Individual / single heads from another Yamaha
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 .
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 .
Re: Individual / single heads from another Yamaha
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
Re: Individual / single heads from another Yamaha
Now this is tempting.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
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
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
Re: Individual / single heads from another Yamaha
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
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