Start Of Big (Huge) Valve Xr 80 Head

[storminnorman07]

i started a thread that was going to lead up to this but someone got their panties in a bunch and got it locked so i'm going to try one more time. before i start this is not a service being offered purely just fun and games. ok now the disclaimer has be said as of lately i have had no urge to pi$$ with my mutant motor., so the mind has been wondering on other things to tear up. and being my new chit is the upright citizen motors i'm hell bent to make my two buddies mad that just drop a pile of money into the pretty lil takegawa +r kits for the xr 100. i'm going to use the stock head and put big ss valves in it with intentions of doing ti down the road if it makes the hp/tq i'm looking to get. stock valve sizing 24mm on the intake 20mm on the exhaust the new valve sizing 31mm on the intake 25mm on the exhaust. already cooked up some big stroker numbers if i'm not happy with it intial pulls. 60mm stroke with room to go even bigger and and bore 62mm putting cubes at 181cc-ish.

[PlanetMinis.com]

[storminnorman07]

had some time to do a lil tinkering between projects. in order to slim the valve stems to 4.5mm stem i had to make my own guides so i turned down a couple today. next step sink the snot out of the seats.

[zwieblekopf]

looks like a good start to a cool project. Going to take some work to get those monster valves in that small combustion chamber!

[storminnorman07]

had some extra time to piss around with the stock head tonight. finally got the seats in and started doing some roughing work to reduce shrouding.



after seats where installed no cutting







anyone need their horse bathed?



after some roughing work











valve in it











gives you a idea just how big the intake is. thats a 25mm valve vs the stock xr's 24mm and the bowls have opened up yet

[50rider340]

Holy crapola, and I thought I was all B-A$$ going to post up getting my lifan 150 finally done with the Takegawa f6 super head with all the miss matched YX valves lol. Great work shame to here ur other thread got the boot.



I got a few questions about replacing the seats/pressing them in. When you do that do you use nitrogen to cool them and pop them in?? or are u doing the traditional way of going same tolerance on both and a press? I would be interested in seeing a couple pictures of the set up and I'm sure a few others would to since prep is half the art of doing such a good job. Granted I will prolly have to wait for you to start another head lol. I say next time you take one of the High Dollar Takegawa heads and make it even better than what it is haha.



Second did you stick with the same valve angle? Never really looked into it but from the XL head I got for the most part they look like pretty darn flat compared to the traditional xr/crf heads.



Third have you come up with a good CaM to open up those puppies. I remember the last time I talked to you we discussed there were very few options, I wonder how hard it would be to make a Takegawa cam work or do they?



With the last comment being said since I havent seen you venture down that road have you considered making your own grind cam?



Keep it up Chad its a bummer there are only a handful of people on here with cool builds, and not the usual I got a bore kit.

[AngryDirtbikers17]

Chad these builds just make my jaw drop.



your work always turns out so sick

[storminnorman07]

Holy crapola, a bore kit.

nitrogen would of been nice but was too antsy in the pantsy to wait to make my life easier. cut for a .006th press fit had seats in the freezer and then pressed. i'm thinking about doing another one but instead of ss valves ti valves but not going to committ to that til i see how this one runs first. my set up was very basic, PITA, and time consuming. if i ever decide to do this on a regular basis i'm going to invest in better tooling. after guides where sized i used my pilot for my valve cutters to get center. i used a angle plate set it to appropriate angle then tied head down. after it was centered and tied down i used my boring head and started making passes on the exsisting seats til they came out. after the old seat was out i zeroed at the bottom of the existing seat bore then cut to the depth i was looking to get to. after that it was simply take passes and mic til i got to my press fit size. i didnt make my own seats so i used ones already made from kibble which where to tall so after pressing i jigged back up faced the seats down to the height i was going for then went back to the boring bar to open the ID of the seat up a lil bit. being the seats where sunk so much and i left guides long i couldn't really do all to much with bowl profiling on the exhaust side i had to endmill the guide shorter in order to get the valve to seat all the way down. after all that it was simply rough cut the valve seat angles so the valves will seat so i can get a idea what i was going to do with the combustion chamber. if i do committ to this other head i'll try and remember to snap some pics. i been trying to get my buddy let me hack up his takie head hes not hearing it though lol. i am however putting some thought into doing my old crf 50 + R cause when i took it off my bike and dropped it on the ol ladys 90 the valves where pretty much whooped



stuck with the stock angles. i was looking into doing something fancy to that nature. plugging and welding the guide holes, relocating the guides and changing angles. but afterthinking about all the work that was going to be needed to do so i bailed on the idea. this whole project came about cause my buddies are running the takie stage 3 heads and we where all standing around bsing and they were giving me hell about having to a mutant motor to beat their takie head. so as a joke i was like i dont even need a takie head i'll take that ragged a$$ stocker head from your old setup and make it beat your high dollar takie head. lol you prolly know how its goes between buddies and chit talking. well it was going strong after that statement. later that night it got me thinking about it and how it would be a fun project. so i started bringing it up here and there and havent had someone say 30+ mm valves are possible that the OS 26/22 kibble sells where hard to do. so that gave me the final push to jump into doing it. with all that said thats why i bailed on the whole relocating guides and changing angles. i dont really intend to keep this motor. more than likely it will go something along the lines bunch of time and money getting everything set up, once done dyno it compair graphs to the takie head, few ego drag races against the takie heads then try to sell my asking price will be questioned and said bike is only worth 500-700 if that. it will sit in my garage taken up space and getting in my way and then someone locally will end up buying it.





i had cam figured out before i even ordered parts. i'm going to use the web cam i have. jordan and i talked about something like this a while back. he was doing a 32mm/26mm +r set up on i think a 106 or maybe it was a 95. anyhow we got on the topic of cam selections and he was going to use a small cam instead of the big 30 or s35 cam. after a bunch of talk back and forth i started understand his method of madness. since that talked i have looked into it further and feel pretty good that the web cam will be plenty of enough cam for this setup. hell i think a stocker cam would even do fairly well. the stage 1 and stage 2 cams will work but it wont be a drop n go deal. i didnt put any thoughts into a custom grind cam for the stock head.

[storminnorman07]

Chad these builds just make my jaw drop.



your work always turns out so sick

thank you

[CHRIQ]

thank you

Youn wanna make me sumpthin sick for the "Hilbilly"?

[storminnorman07]

Youn wanna make me sumpthin sick for the "Hilbilly"?

what you have in mind and how bad do you wanna hurt yourself lol

[storminnorman07]

decided to do a lil playing with the bv stocker head tonight. got the ports roughed in pretty decent and epoxed. if reversion don't bite me i think she'll pull ok. didnt come out as i had it pictured in my head. really should of welded some in the ports. damn my antsy ways lol.

[50rider340]

Looks great chad, i can't wait to see what numbers this thing pulls on the dyno.

[storminnorman07]

mom my xr 100 has her big girl panties on now!....lol so since im STILL waiting on parts, powder to be done, and tranny to come back from treatment for my mutant motor i decided i need to get working some more on this bv stocker motor. after doing some talking with Dr frankinstein he had mentioned he does some work for a kid thats top in the 100 class and he would be willing to ring its neck for me and give me feed back how it compares to his 124 +r. seeing how i can no long race competitively due to old injuries i'm going to ship it off to him after i have my dyno fun with it with that said the class has a cc limit of 125 so i'm going to do a 63mm bore with a 40.1mm stroke giving it 125ccs on the nose. after the kid rings its neck for a while and i get it back then ill start pushing some stroke to her. if i havent figured the 62mill stroker out it will get a 57mm stroke making it a 178 if the 62mm stroker goes in 195cc



115cc 57mm piston and cylinder hasnt been bored yet. bore is only 61.5-62mm now thats talking dirty

[50rider340]

Man that head came out good. What do you think your compression ratio is going to be since its all filled in?



Man that is rough not being able to race anymore what were your passed injuries that caused for your retirement? I always tell myself thats it no more racing your hurt enough but I always end up still going haha.

[storminnorman07]

Man that head came out good. What do you think your compression ratio is going to be since its all filled in?



Man that is rough not being able to race anymore what were your passed injuries that caused for your retirement? I always tell myself thats it no more racing your hurt enough but I always end up still going haha.

i would like to get it between 11-12:5 range. terrys suppose to be sending me a 63mm piston once i get that in my hands ill be able to get a better idea what the cr will be. i just hope he dont send me one that i fly cut for him cause the notches wont need to be no where that deep for this head.



at times it fires me up and othere times it dont bother me. i loved racing but if i had my pick i would pick a group ride day at the track over racing. i would love for my injury story to be something of lines i was attempting this crazy a$$ jump and came up a lil short but mine was work related. i use to do roofing back then i was sicker than a dog that day and didnt wanna go into work but the forman kept on and on saying dude you know when winter hits and we start getting slow the guys that are working hard now will be the guys they let work first. so i loaded myself up on all kinda meds and went to work not the best idea being i worked on roofs. needless to say i was absent minded was laying a seam walking backwards towards the edge of the roof there was a tiny peripit wall that hung inwards towards the roof my heal hit that and i went head first towards the ground at about mid 30ft. i knew if i let my head hit at that height death was certain so i tried catching myself so it destroyed my right wrist tore a bunch of tendons and legiments broke some bones and fractured what the doctors say is my lower back but to me if feels like my hip. i was in and out of surgery for about 2 years til i was like i'm done its not getting any better the options your giving me now have more cons than pros im going to try to learn to live with the pain if it gets to bad ill be back if not ill deal with it. my last options where completely cut the end of the ulna bone off which there was literally 2 pages of complications or fusing my wrist so it had no movement well both options suck loosening the tip of the ulna makes everything super unstable so that means everything i like to do for fun would come to a end simple just cruizing through trails would be to much jarring and if i fused it i would have one hell of a time trying ride a bike. i wouldnt let them do any surgeries on my back i seen to many ppl get back surgery and none have gotten better seem like they get worse, and there first surgery would of been aggressive right off the bat they wanted to start fusing shit. so of course that got vetoed to



here was one of the many operations they shortened the ulna bone by 6mm now there is a ti plate that runs almost the length of my forearm. i often joke with guys and tell them my wrist has more titanium than a indy car

[geezer]

Damm nice work there! That will get er done! Amazing

[storminnorman07]

i almost have the head done. what a learning experience this has been. if i ever do another bv stocker head there will be a number of things i do differently. prolly number one thing would be weld up the ports so i can straigthen them out better and have nicer short turns. oh well you live and you learn right. all thats left to do is touch up the epox once it sets cut stem length cut keepers and harden tips and shes ready to be assembled. here are a few shots. yeah i know ports arent all that nice had to do what i could with them since i didnt weld prior to seating it.

[storminnorman07]

Damm nice work there! That will get er done! Amazing

thanks im gunning for that takie r head

[50rider340]

Man that came out so gnarly. What MM carb are you giong to go with to let that thing EAT!

[storminnorman07]

Man that came out so gnarly. What MM carb are you giong to go with to let that thing EAT!

it will get the classic pwk 28mm. whenever it gets big cubes it might get a 30-32mm pumper assuming i can cram it in there