to big valve or not to big valve my +R head

[storminnorman07]

Naturally its my decision to make in the end. Just wanted some outside opinions cause 99% of the work I do is high performance based and the more hp that can be provided within the allotted budget the happier the guy/gal is. With this build the g/f is unsure if she wants more powe cause she don't understand what it will do. When I try to explain i apparently am to technical in my explanation. From what I see of her riding I feel she could use it. And again cause ur prolly thinking then y the hell did u start this poll. Well I wanted to get some outside views what u guys would if u were in my position. Just so we are clear I wasn't burnt a smart ass when I said bigger valves would make more within the curtain. Alot of guys think big valves always = more top end. Was just simply elaborating that you can oversize valves and make more bottom and mod if setup properly. So if u took offense to my post please don't it wasn't meant as anything other tha you can oversize the valves and maintain the bottom end it has or make it better as well as opkther protiona in the curven

[PlanetMinis.com]

[geezer]

LOL wasnt thinking that! but sometimes I and up answering my own questions in the transmission busniess.I like youre post.

[geezer]

Come on, lets get this going again. Id like to know more about this combo.

[storminnorman07]

well poll is almost over and looks like majority votes go to BV this puppy . so that is what imma gonna do. thank you to everyone that placed votes.

i didn't give much details about everything cause the engine is being stuffed in a honda trx 90 and this is a crf 50 section and i didn't want to hear some smartass tell me you know this is a crf 50 section. but since i have sparked an interest for a few i'll give details and post the progress of it on here.

chassis as stated already is a trx 90 that has been widened and long travel suspension on it.
prior engine setup
-takie +r head w/ 35 cam and my port work
-keihin 22 or 24mm carb
- trx 90 bottom end was used and only thing done to it was heavy clutch springs
- 54mm tb piston
- lifan OR ignition
- and light bore pro circuit exhaust
- 54mm x 49.5mm puts cc at 113.37cc

New engine setup

-bore will get upped to 57mm i'm going to use a tb 57mm piston simply cause its cheap and easy/quick to get. it is going to require me to do some flycutting to the valve notches. but i'm going to oversize the valves so more than likely i would had to oversize valve notches any how and w/ the stroker crank i'll have to take a lil off timing edge to establish the deck height i want.
-stroke will be upped to 57mm also. i will use a takie 54mm offset stroke to 57mm
-carb will be either a pe 28 or pwk 28 not sure which one i will use. it will depend what tuning length i can get w/ manifold in the trx chassis
-will still use the lifan OR
-will get a CR 4 speed trans
-will get a manuel clutch
-head will get a full over haul. new guides, oversize seats, oversized valves to 30/24, valve springs i'm not sure if i'll change yet or not. once i check seating and nose pressures i'll make that decision
-exhaust will eventually get change haven't decided if i wanna build a custom tuned exhaust for it or take the easy route out and just pick up a chp
-i'm going to try the s35 cam for now simply cause i sold all my other cams for this head.

[LongMooie]

i think its about time she learnt to ride a proper bike and get rid of the quad
CRF150Rb will do nicely

[storminnorman07]

takie 54 stroke to 57mm
oil pump shaft clearanced for 57mm crank. yes it will live have done it before w/o failures

tight quarters eh
klx 30mm +R valve sitting on the factory seat
forgot i started bv-ing this SE head. big ole 31/25 valve. if i only was a kitaco type of guy lol
valves for the se head but the +R will look real similar

[storminnorman07]

i think its about time she learnt to ride a proper bike and get rid of the quad
CRF150Rb will do nicely

lol i have tried her and 2 wheels go together like oil and water.

[50race]

lol i have tried her and 2 wheels go together like oil and water.

Remember how well a water pump can mix oil and water when a seal fails and make milky white water oil.

[SwapperMX]

Damn dude, you really dont mess around. That is SWEET !!!

[taz69]

Hey Chad where did you get that cylinder?

[storminnorman07]

Hey Chad where did you get that cylinder?

That's a resleeve I have done. But I believe shark is the companies name that has them already done.

[storminnorman07]

lab top has been on the fritz finally got it to upload some pics.

counting counterbores for oversized seats
intake seat dropped and cut
3 angle valve job. may change to 5 whenever valves finally come in
intake port roughed in. going to throw some epox in there i didnt like the burn pattern in the combustion chamber when i pulled it apart. so a lil epox to change up short turn and entry angle should to the trick
exhaust seat dropped
ready for valves

[storminnorman07]

almost done. finished head tonight, got cases assembled, machined piston for the deck height i want. all thats left to do is check piston valve clearance may or may not have to flycut and i'm not tickled pink w/ how the drive gear on crank lines up w/ clutch basket gear so i'm going to machine a spacer and do a lil work to get everything where i want it. here are some more progress pics

timing edge of piston machined to give the deck height i want w/ big stroker
valve/seat/guide work all done and assembled in head
white diamonds valves head ods turned down/margins thinned/ 45 seat face ground back in/ O.A.L cut/ stellite tipped/ and grooved
factory +r intake weight
kibble intake valve weight. same weight as klx +R intake valve
factory +r ex weight
oversized kibble weight
never valve spring set up
factory valve spring setup

[LongMooie]

The bigger valves will make more hp within the curtain over the factory 28.5/23.5 setup. When I get off work ill check and see if I still have any dynos of factory sized valves to oversized valves.

got any for the 106 +R im sure i need new piston and rings in my +R, how much would a valve job be?

[Jordo]

Storminnorman07. Nice work! I'm happy to see your educated and resourced well. (tooling) I too have done simular motors and I lol'ed a few times while reading your posts. I just finished up a project where i stuffed the intake port to increase the velocity for a change in power delivery. Most people here don't have the background we have and I find it challenging to educate people on physics 101 every time I suggest a pipe or carb size. And omg I'll never comment on a "race fuel" thread ever again! lol. Anyway it's nice to know there are others alike on PM and it's not all 15 year olds talking nonsense.

I see your from PA too! Do any big bike Moto in D6?

[storminnorman07]

got any for the 106 +R im sure i need new piston and rings in my +R, how much would a valve job be?

sorry don't have any 106 R pistons. wish i did this really could use the 106 57mm scut +R piston. i thought the Tb would work out nice but...not so much, intake top ring land is real thin. valve job 60 bucks plus the ride home.

[storminnorman07]

Storminnorman07. Nice work! I'm happy to see your educated and resourced well. (tooling) I too have done simular motors and I lol'ed a few times while reading your posts. I just finished up a project where i stuffed the intake port to increase the velocity for a change in power delivery. Most people here don't have the background we have and I find it challenging to educate people on physics 101 every time I suggest a pipe or carb size. And omg I'll never comment on a "race fuel" thread ever again! lol. Anyway it's nice to know there are others alike on PM and it's not all 15 year olds talking nonsense.

I see your from PA too! Do any big bike Moto in D6?

thanx jordo. as with any forums you gotta pick and choose when you discuss and when to just leave it be. lol dont forget we too were once knuckle head 15 year olds thinking we knew everything and had engine building by the horns

i haven't raced since 2003 and even then i was a atv racer. never was one for the 2 wheel scene until i rode a pitbike. these sketchy lil fockers are so much fun to ride.

[storminnorman07]

she fired up on the first pull now the fun begins of putting plastics all back on and tuning it in

[taz69]

So what piston did you endup going with or what did you have to end up doing to that TB piston to get it to work with the +R head Chad??? Thanks..

[storminnorman07]

So what piston did you endup going with or what did you have to end up doing to that TB piston to get it to work with the +R head Chad??? Thanks..

Depends what's ur definition of work..lol its in there piston and valve clearance on intake side is slim to none. So one hick up and this bad boy will be a paper weight. Im just going to run it until I can get a piston in for it.