[Luckiduc13]

Here are some pics of my Yoshi Head Pipe. I give up on worrying about if its lean or not. It has always been my understanding that purple stainless steel meant excessive heat, but who knows...

And here are some pics of my new start switch! Its really a kill switch off a RM250. Easy to install and cleans the bars up really nice!

 

[quadracer450 52]

Looks like my stock pipe. You run race gas? I have a cherry bomb, removed baffle, airbox lid.

 

[Luckiduc13]

Looks like my stock pipe. You run race gas? I have a cherry bomb, removed baffle, airbox lid.
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Im running 110 octane with a cherry bomb and airbox lid removed.

 

[benltr]

my stock header is the perfect color, dark brown.. and i think ACELTR have a full yosh and its brown too... we know that we are not running lean so...

 

[LTurboR450]

your head pipe will turn several shades of blue, purple and gold and that is completely normal if your ltr sees high rpm's frequently, despite what your yosh info sheet says about being lean. that sheet is not vehicle specific.

remember that just because it is stainless does not mean it can handle the heat that a head pipe sees every time you run it without at least changing colors. if it was a coated head pipe, it would not change, but it is not coated. uncaoted stainless exhaust manifolds and headers on the race cars, turbo cars and street bikes i build turn the same colors as well, it is completely normal for anything that gets a regular beating like race cars, street bikes and our ltr's.

and dont forget your yosh rs-5 spec and installation sheet clearly states that they strongly recomend the CRBM with thier exhaust on the ltr. if you didnt have it you would very likely be running lean. the CRBM actually adds fuel (among doing other things) to optimize power when running with an aftermarket air box or filter and an aftermarket exhaust (or both the stock air box lid and stock exhaust sparky removed). your pipe is identical to mine, and to everyone elses who is running the same mods as you. you are not running lean, trust me.

 

[SandJunkie]

Nuff Said!

 

[Luckiduc13]

I am running the cherry bomb. I didnt post this for someone's "knowledge" if im lean or not lean. I DONT CARE! Ill ride it till it quits then buy a new one! I will say that I know for a fact that stainless turns under extreme temps, We know that. I do think mine is a little more than it should be. I have seen a fellow racer with the same setup and his is not near as purple as mine! BUT no worries i have a Power Commander and will fine tune the bike when it gets here!!!!!!!!

 

[LTurboR450]

and i didnt post my "knowledge" for you to reply with a statement like that, it was a little overly hostile, dont you think? it wasnt my intention to piss you off with an explination, did it not occur to you that other people on this forum might want to know some of the things that i stated in my last post? when you said "...I give up on worrying about if its lean or not. It has always been my understanding that purple stainless steel meant excessive heat..." i was under the impression that you had decided you were too lean, and that is not true, so i took it upon myself to help you and others out by sharing my "knowledge." from now on if you dont like my "knowledge" feel free to ignore it, but dont get hostile.

and the logical explination for your pipe being more purple than someone elses is that you simply ran your ltr a little harder than that person has.

 

[Luckiduc13]

I apologize. I have become tired of the issue "lean or not lean". That is my reason for being a tad touchy on the subject. I know clone ran his and it had perfect A/F ratio and thats awesome. I do however work around ong time mechanics who I trust and a few motor enthusiast on this and another site will agree that in a normal situation stainless turns different shades under extreme heat. These smaller cc motors might be something totally different but surely same theory would apply.

It was explained to me this way. A lean condition will heat the head up rather quickly and above normal (spec) operating temps. In return this aids in heating the headpipe. When stainless reaches a certain tempature, not sure what it is, the metal turns shades of blue and purple.

I am no trying to discredit anybody, but just state my opinon as well. The possibility of the head pipe being extremely thin has also entered my mind. Less metal means quicker heating and cooling. And allows the metal to reach higher temps.

Again I am sorry for the bashing. I realize we are one big happy family and in this together.

 

[LTurboR450]

ah its no problem at all, i know the lean/not lean subject has been beat to death here and everywhere else for that matter, and im sure we are all getting a little tired over the subject. but one more thing before we end our discussion.

what you mentioned about our head pipes being thin is absolutely right. normal car headers are more than double the thickness of the head pipe that came with my RS-5 and some turbo car manifolds (especially aftermarket ones) are nearly quadruple the thickness and posibly even thicker due to the weight AND extra heat they have to bear. on top of that, our LTR's see much higher rpm's for much longer periods of time than any car thats not an all out road race machine, therefore they create more heat and that heat gets pumped right into the head pipe and out the exhaust. im not doubting your mechanic buddies knowledge, because they are exactly right, in a normal situation on any car a purple stainless header would mean its running very hot, i.e. lean. but in the case of the turbo race cars and race bikes that i build, there isnt a normal colored stainless header to be found, because after a few thorough beatings on the tracks and streets they are as blue and purple as can be. and our LTR's are in fact race quads.