think about it..changing oil will do nothing, oil is in the bottom end, valves are top end...not adjusting it could wear it out quick, and they just plain wear out man...riding it hard will do it...

 

Is this same bike that has the pipe and air box mods that is at the bottom of your posts. If so how much did you go up on your jet size when you made these changes?

 

Did he give you the valve that was shot? What did it look like? Did he say it was burnt up, bent, etc...?

Did you have the valve clearance checked after it was broken in?

Tony

 

The first thing you need to do is to take an extended course in remedial reading, language, and sentence construction. a vocabulary improvement to eliminate the thinly disguised obscenities would't hurt either.
You're 14 years old, for heaven's sake!
Then people would have a clue to what you're saying!

 

the oil has alot to do w/ the valve train. also if the valves were out of adjustment possibly the pistion kissed that valve a time or 2.

 

sorry hot shoe, by the way i am 15, but anyways, i gotta find out all the info bout the valve i am going to go pay him a visit, once i do that ill get back to you, but i went up and down a few times (jets)on the quad, i am at a 124 right now because the air lid is not completely off so i didnt jet to a 128, it just has holes, so it was aat 118 , then a 128 with no air box lid, then to a 124 now, with holes

....ill try to fix the spelling crap for ya hot shoe

 

I knew you could do better

HAPPY BIRTHDAY!
As I have discussed with you several times in PMs or e-mail, you need to do a test ride & plug read rather than just guessing in order to know whether or not the engine is lean. One of the primary causes of burned valves is a lean air/fuel mixture. The lean mix causes an overheated engine, which burns valves and also pistons. Worst case is a broken piston with pieces falling into the bottom end...major bucks!

Once you do the test ride with a new plug & read rhe plug you'll know what to do, if anything, in regard to jetting. You may also find out why you need a new valve or two.

 

im not sure if you got the valve fixed yet or not, too lazy to read about it, but on my xr i didnt' ever adjust the valves...and when bodge said it might "kiss" the valve a time or two, their is no second time after the piston touches the valve...unless it literally brushes against it like .0001 away...i jammed a valve straight into the piston, i don't think u have that big of a problem w/1 valve being burnt, just replace it and remember to get the thing checked every couple of months...bodge, have u ever even been inside a fourstroke engine? ah yes...the good ole xr80

i remember that thing...what ya need their ian is a two stroke...problem solved

 

i actually was lookin at this nice 250r race rady 250r, no engine mods, never raced, clean as hell mint, just a pipe, and some other goodies, i was ready to sell the damn 300 and get it....ya hot shoe, u were right i was wrong, i should have listened to u, but i am stupid your smart, i am ugly u are good looking, i am alwasy wrong, u know wut your talkin about....

...anyway, i will do the plug read again, i am just glad to find the problem....and tell my freind he is a damn idiot saying my engine wont be hurt if it runs lean....but will my vavles still burn if fat? or jsut lean? gotta know, casue i just go the machine in may

 

my xr80's piston has indents in it from just tuching the valves

. the valves r messed up on it also gotta replace them damnit. and josh is right ian u need a 2 stroke, a 4 stroke like an xr unless bought new n taken care of is a time bomb

 

Ian, no, you won't hurt a thing if you jet a little or even a lot on the fat side. It's always better to re-jet on the fat side when rejetting and drop down a size if the plug indicates. The worst that can happen is a fouled plug and that's rare on a 4 stroke.I'm betting that a lean mix is the reason for the burnt valve.

 

bodge, believe me, them indents you see AREN'T FROM TOUCHING THE VALVES you idiot...can someone else please explain to numbnuts that those indents are always their on fourstroke pistions....

 

the valve pockets? yep there should be one for each valve milled intot he piston...a valve only touches the piston once in its life....

 

yup....

 

oh ya!! jsut got like 6 in or more of snow...i am goin to take out the quad now! y am i talkin to u guys? haha later

 

This has got to be the funniest post I have ever read. We have the correction of spelling and gramatical errors. We have Birthdays and even have vavles and pistons smacking together, Burnt valves, riding in 6 inches of more snow, etc... Damn this was a good one......

Btspyder

 

so my dad just scared my mom...she has a 98 chrystler concord, and he has his chevy lumina mini van...nehow, he wants to trade his van in for a jeep, really bad, but doesn't know if he wants the extra payments..so he comes home today with a 2000 cherokee sport(mom's car is nowhere to be seen)..and he comes in he's like josh look out in the driveway, im like oh [bleep]...mom goes out and he was goofin off runnin away, she's like u better run! lol, where's my car?? and he's like well we wanted to trade it! she's like for a 300M! not a damn jeep! nehow, he was just taking it for a test drive to see if he wanted to trade his van for it or not...he went and took it up the backhill in the snow already to see how the 4x4 worked....i was like dad dude...ya know, u can just give me the jeep, go get mom's car, keep your van, and we'll all be happy

IN MY DREAMS

 

ill take some pics of the piston n the valves.

 

[image]http://[/image]

 

piston

 

on the left side. it is where the valve met the piston.

 

now tell me the left one isnt deeper than the right.

 

u gotta point

 

i'd say that has something to do w/intake or exhuast valve dropping down further or something...brian, BELIEVE me, if your valve connected w/your piston hard enough to freaking dent the piston your valve WOULD NOT STILL BE IN PLACE!!! think about it, the stem on it is like the size of a tooth pick...i mean, maybe by some miracle a valve could stay in place after that impact if like it dropped straight down, but it's even at an angle, it would just snap the valve off...believe me dude....

 

and yea, brian, we do need two strokes...lol, but our daddy's won't go out and buy us one after a little persuasion...even if we do work for them afterwards....