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Old 05-09-2013, 11:51 AM   #16996
Dual Badger
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What do you think?

I have a new to me 2002 xr650r that has a fmf pipe with the stock headers.
Will a fmf powerbomb header system make a big difference?
The bike runs great at this time !!! Thanks
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Old 05-09-2013, 01:33 PM   #16997
crypto666
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Quote:
Originally Posted by Dual Badger View Post
I have a new to me 2002 xr650r that has a fmf pipe with the stock headers.
Will a fmf powerbomb header system make a big difference?
The bike runs great at this time !!! Thanks

You probably won't see much from a header until you;
open up the intake, carb and valves, open up exhaust valves, up the compression, and perhaps the bore, more agressive cam,

and then the you will probably only notice the difference in the upper end.

I would spend money on other things. The header was the last big item for my bike after rebuild everything else.

Motor mods are highly over rated, suspension is where its at.
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Old 05-09-2013, 05:48 PM   #16998
Dual Badger
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Headers

Thank you !!! I will spend the money on other parts.
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Old 05-09-2013, 08:44 PM   #16999
Shibby!
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I have the powerbomb header but cant' say for sure what it does by itself since I put the exhaust and header on at the same time. Really opened up the high end with those two additions though. Before it wouldn't labour at highway speeds, but felt more like torque than high HP. Now it feels like HP easily maintaining and enjoying that speed.

Not sure if that makes sense.

The downside to the Powerbomb is it shares the same diameter pipe as their standard header, just much thinner. This causes heat to radiate off the thing. It gets SUPER hot. With proper pants it's fine, but I've had the pleasure of riding it with shorts (yea yea, I know. It was on my trip where gearing up wasn't really an option) and it damn near cooks your leg. It does give you a mild burn even holding your leg out in the wind. In hot weather I do this even with boots/pants to keep my leg cool, although the heat is much less noticeable.
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Old 05-10-2013, 01:20 AM   #17000
One Fat Roach
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been hunting for a new bike and came across this one yesterday
http://yakima.craigslist.org/mcy/3793697795.html
curious what you xr vets think,??
Worth getting??
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Old 05-10-2013, 06:14 AM   #17001
BuRPsa
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Quote:
Originally Posted by jwalters View Post
Hi Guys,
Just wanted to say thanks for the help with my jetting. The bike was running lean last December, but I over compensated. After double checking the float height (right at 16mm) I downsized to 70 idle jets and 175 mains. Still was spuddering so I pulled the air filter, lo and behold it ran great! So at that point, I knew I was too fat in the mid range. Long story short, I lowered the needle 2 clips and that put me right where I needed to be.
Thanks again.
Jesse

Jesse,
if an engine 'spudders' then it is running really rich, and the solution is to reduce a jet, not merely dropping the needle. It may feel fine now but I bet it still runs rich, your exhaust telling telltales.
I'd put in (with clean filter, set valves etc) the 68S, set the needle to 'mid' and drop the main size-by-size until you feel it is too small - then use the averaged size with your current one which should put you in the ballpark. Only then finetune the needle.
Of course this is a rough way of jetting, the best is to hook up an analyser on a dyno, however it will work.
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Old 05-10-2013, 06:33 AM   #17002
babuja
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Quote:
Originally Posted by Dual Badger View Post
Thank you !!! I will spend the money on other parts.
That's the way to go...best mod i've done was usd fork conversion.2nd best was vision x led light
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Old 05-10-2013, 06:42 AM   #17003
8lives
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Quote:
Originally Posted by bassplayinroach View Post
been hunting for a new bike and came across this one yesterday
http://yakima.craigslist.org/mcy/3793697795.html
curious what you xr vets think,??
Worth getting??
The price is good,the accessories rock,it's a XR looks like a good bike.
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Old 05-10-2013, 07:10 AM   #17004
crypto666
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Originally Posted by Shibby! View Post
This causes heat to radiate off the thing. It gets SUPER hot.

Why haven't you wrapped it yet? You will love it, and if you wrap it back past the shock, the shock will love it too. I think exhuast wrap does more for shock heating than going to a cr500 shock.
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Old 05-10-2013, 10:58 AM   #17005
sintax
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Originally Posted by ride4fun562 View Post
Does anyone live near Southern California , Long Beach more specifically. I want to compare my piggy to someone else's and I don't know anyone who has one. It would be awesome to go on a little ride and compare if you have it plated, gas would be on me, send a PM.
I'm in Riverside, but Slogger is actually in LB. Maybe hit him up.

Mines currently torn down for TAT prep, but his should be up.
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Old 05-10-2013, 11:56 AM   #17006
Shibby!
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Quote:
Originally Posted by crypto666 View Post
Why haven't you wrapped it yet? You will love it, and if you wrap it back past the shock, the shock will love it too. I think exhuast wrap does more for shock heating than going to a cr500 shock.

I'm lazy... =)

I was in autovalue in the states. I should have asked if they had fiberglass wrap. Probably 1/3 the cost we pay here..

The other downside is we have very muddy conditions. I've heard of people who wrap them seal with them silicon spray to prevent moisture absortion which leads to rust, etc.

I'll probably do it here before riding it too much. I'm sure both my legs and shock would LOVE it. I can imagine that shock gets damn hot. I know my gas starts boiling if really chuggin along. The tank sure fits well now though!

Adding it to my list of things to do here now...
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Old 05-10-2013, 02:05 PM   #17007
jwalters
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I had the stock header with the FMF exhaust. I cracked the stock header (crashed it) and so I bought the aftermarket FMF header. I did have to rejet a bit richer, so there was a power gain, but it's not a huge difference.
JW

Quote:
Originally Posted by Dual Badger View Post
I have a new to me 2002 xr650r that has a fmf pipe with the stock headers.
Will a fmf powerbomb header system make a big difference?
The bike runs great at this time !!! Thanks
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Old 05-10-2013, 02:08 PM   #17008
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Thanks. I'm going mostly by throttle position. i've always worked undre the impression little to no opening was the pilot jet, mid throttle opening is the needle and near WOT is main jet size. Since WOT was fine, I was just adjusting the needle.

What puzzles me, is how off the jetting guide is for me. Maybe the FMF kit doesn't use the B53E needle or something, but I had to go 2 needle positions up and several main jet sizes smaller than what's recommended by the jetting guide for my temp/altitude. But oh well, it's running good now! I'm keep playing around with main jets and report back.

Quote:
Originally Posted by BuRPsa View Post
Jesse,
if an engine 'spudders' then it is running really rich, and the solution is to reduce a jet, not merely dropping the needle. It may feel fine now but I bet it still runs rich, your exhaust telling telltales.
I'd put in (with clean filter, set valves etc) the 68S, set the needle to 'mid' and drop the main size-by-size until you feel it is too small - then use the averaged size with your current one which should put you in the ballpark. Only then finetune the needle.
Of course this is a rough way of jetting, the best is to hook up an analyser on a dyno, however it will work.
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Old 05-10-2013, 02:51 PM   #17009
PeteN95
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Quote:
Originally Posted by Shibby! View Post
The other downside is we have very muddy conditions. I've heard of people who wrap them seal with them silicon spray to prevent moisture absortion which leads to rust, etc.
Yes, I've seen a lot of corroded headers after wrap is removed around here! Never heard of silicon spray sealer? Is this some kind of spray RTV?
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Old 05-11-2013, 07:03 AM   #17010
Cpt. Ron
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Exhaust coatings/coverings

I've wrapped the XR headers in the past, but usually remove it when I'm going to be riding in wet or muddy conditions. It's usually cooler then anyway, so heat isn't so much of an issue. However, my previous exhaust was all stainless steel, so it wasn't much of an issue. My current exhaust is titanium, so again corrosion isn't a problem. I'm currently in the process of wrapping it for the summer.

My 950, on the other hand, has single wall mild steel exhaust (with some type of plating). And that bike gets hot. It's all enclosed so heat doesn't dissipate unless you're in 3rd gear or higher. There are quite a few stories of those pipes rotting away, so I've never wrapped it. Instead, I did ceramic coating inside-and-out. That's some amazing stuff. I don't think it's as good as good exhaust wrap, but it's durable and looks better.

As for silicone spray on the wrap, I'm not sold. That wrap is some pretty porous stuff. I'm sure it would take a lot of coating to really seal it. And no matter what, it won't be perfect. So now you have a mostly-sealed exhaust wrap that will then hold in moisture instead of letting it out.
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