Factory X Racing head Question

Location
Indiana
Got this head and girdle bolts in a box of parts that I purchased. Does anyone have any experience with it? Was there a special head gasket or did it just use a stock gasket? The only O-ring is around the water jacket outside. Please share some info :)
Thx in advance!IMG_2087.JPG
 

Big Kahuna

Administrator
Location
Tuscaloosa, AL
Gonna say this is the same as the Greater Yamaha, Wamiltons heads, Think UMI made them, There have been a few others that were made with their on label on them.
 
Yes you need a head gasket because you need to seal on Yamaha sleeves. Most Yamaha dome heads the domes sit down a couple thou to hold compression on the press in sleev

Run a head gasket or you will be sorry.
 
Location
Indiana
Thanks guys, I figured that ( see my 1st post). I was wondering if it originally came with an aftermarket head gasket or if it was designed to use the stocker?
 
I've got a bunch of those since a local sacramento guy steve sabotnick was factory X racing. mike coe ran a lot of his stuff and he was a real guru. he made pipes too using a Coffman sizzler head pipe with a water adj mod like factory pipe and welded up his own chamber. most of the superjet stuff I got was early to mid 90s square and RN stuff, so yea, its very old school when the SJs first came out. that head is going to be very high compression and I would just run the thick stock head gasket to lower it some. its race stuff for sure and it probably used 3 base gaskets to raise port timing too. that head does not make sense with a waterjacket seal but no chamber seals. I've got some with dome Orings and 1211 for water jacket seal. I know they used to top deck the cylinders and maybe with 2 perfectly machined surfaces, they didn't need a head gasket. at least for 1 race anyway
 
Last edited:

Quinc

Buy a Superjet
Location
California
I've got a bunch of those since a local sacramento guy steve sabotnick was factory X racing. mike coe ran a lot of his stuff and he was a real guru. he made pipes too using a Coffman sizzler head pipe with a water adj mod like factory pipe and welded up his own chamber. most of the superjet stuff I got was early to mid 90s square and RN stuff, so yea, its very old school when the SJs first came out. that head is going to be very high compression and I would just run the thick stock head gasket to lower it some. its race stuff for sure and it probably used 3 base gaskets to raise port timing too. that head does not make sense with a waterjacket seal but no chamber seals. I've got some with dome Orings and 1211 for water jacket seal. I know they used to top deck the cylinders and maybe with 2 perfectly machined surfaces, they didn't need a head gasket. at least for 1 race anyway


You need to write the jetski bible.
 
Location
Indiana
I've got a bunch of those since a local sacramento guy steve sabotnick was factory X racing. mike coe ran a lot of his stuff and he was a real guru. he made pipes too using a Coffman sizzler head pipe with a water adj mod like factory pipe and welded up his own chamber. most of the superjet stuff I got was early to mid 90s square and RN stuff, so yea, its very old school when the SJs first came out. that head is going to be very high compression and I would just run the thick stock head gasket to lower it some. its race stuff for sure and it probably used 3 base gaskets to raise port timing too. that head does not make sense with a waterjacket seal but no chamber seals. I've got some with dome Orings and 1211 for water jacket seal. I know they used to top deck the cylinders and maybe with 2 perfectly machined surfaces, they didn't need a head gasket. at least for 1 race anyway
The same Mike Coe ( Team Honda) 3 wheeler racer back in the 1980's?
 
QUINC, its all insignificant/useless info.
chapter 1
genesis: they're all good when they run and junk when they don't.
revelations: they all die.
the end
The same Mike Coe ( Team Honda) 3 wheeler racer back in the 1980's?
world champion jetski racer on superjet and octane. not sure about 3 wheeler racing. if you google his name with jetski, the racing results come up from long ago. he now guides fishing trips in the sacramento area.
 

Quinc

Buy a Superjet
Location
California
QUINC, its all insignificant/useless info.
chapter 1
genesis: they're all good when they run and junk when they don't.
revelations: they all die.
the end

world champion jetski racer on superjet and octane. not sure about 3 wheeler racing. if you google his name with jetski, the racing results come up from long ago. he now guides fishing trips in the sacramento area.


You should take pics of all the parts you have with descriptions on who built them and who ran what on what ski etc.
 
Mike Koe with a K wasn't it?

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I knew that, but i'm getting senile in my old age.

You should take pics of all the parts you have with descriptions on who built them and who ran what on what ski etc.
HELL NO! I don't even want to take pix to list them on ebay for sale. why the hell would I want to waste my time listing info that doesn't make me money? if it doesn't have a dollar value attached to it, i'm not picking it up off the ground or even looking at it! i'm so lazy i'm surprised I wake up every morning.
 
Location
PNW
I knew that, but i'm getting senile in my old age.


HELL NO! I don't even want to take pix to list them on ebay for sale. why the hell would I want to waste my time listing info that doesn't make me money? if it doesn't have a dollar value attached to it, i'm not picking it up off the ground or even looking at it! i'm so lazy i'm surprised I wake up every morning.
Lazy bastard, get up and ride!

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Lazy bastard, get up and ride!

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at least my body isn't broke down so I can ride anytime I want. unlike somebody that's giving me crap.
that's all I want to do is ride! oh, and make easy money by picking up parts off the ground and handing them off for a pocket full of cash.
and I don't want to work on junk even when its broke. I had to replace the starter on that fake rickter today and I hated doing it! it aint no gravy job on that thing either. the best part was pulling the cherry like new OEM starter out of the starter pile.
 
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