HEADS UP!!!

Site upgrade in progress... Core site functions are working, but some non-critical features/functions will be temporarily unavailable while we work to restore them over the next couple of weeks.

Please post any bugs you encounter, but before you do, check to see if it's already listed.

Thanks for your patience while we work to improve the community.

Sign in to follow this  
Followers 0
sirthumpalot

Lots of carbon in the header

12 posts in this topic

Last night I removed the head pipe for the first time on my '01 and I was shocked at how much carbon buildup there was in there! It looked soooo thick and sooty. The jetting is stock and it runs like a champ so I don't think it's over rich. Has anyone else who's running on pump gas noticed this?

Share this post


Link to post
Share on other sites

Like Shawn said, spooge is a sign of being too rich.

Another thing, are you using the stock plug or did you accidentally put in a cooler plug?

[ August 15, 2002: Message edited by: yznvegas ]

Share this post


Link to post
Share on other sites

It's the stock plug and jetting. It runs so crisp that I have a hard time believing that it's rich. No stumble or hesitation, always instant throttle response from bottom to top. Also it wasn't oily or anything, just dry soot. Are you guys telling me that you've removed your headers and there's not a lot of black soot inside? I'm not talking about mounds like you get in a 2 stroke pipe, but a good even coting all the way around the inside.

Share this post


Link to post
Share on other sites

I guess some residue would be normal, I was picturing like that wet oily spooge you get from 2-smokes when they are too rich or your mix is too oily. If it's running crisp than don't worry about it.

If it's not broken, don't fix it. :)

Share this post


Link to post
Share on other sites

A coating of carbon in the header is normal, just like the exhaust manifold on a car. The thumpers spit hot carbon during the exhaust stroke which is why a spark arrestor is actually more important on a thumper than an oil burner...

Share this post


Link to post
Share on other sites

My vote is that it is a tad rich. Mine is grey from the head to the stinger. Lean your jetting out a tad and you may see your crisp throttle response get even better. Jetting is simply to easy to change to not give it a try.

Share this post


Link to post
Share on other sites

Here's the deal.

The bike is rich. Your pipe is filling up with unburned fuel.

A rich mixture, will usually produce more power in the mid to top range, and less on the lower range. It also makes the bike run cooler.

Lean does the opposite and often leaning the idle circuit will make the bike snappy when coming off idle.

Stoichiometric is the term that refers to the "perfect burn". The ratio of the past has been updated in the last 15 years since we now sniff the tail pipe instead of reading quarter mile times.

This is why it's good to adjust the lower circuits lean and the top end circuits rich, (unless you like sitting still with the engine running).

DaveJ

Share this post


Link to post
Share on other sites

I spend alot of time building 4 stroke motors and pump gas is the cause. It has aditives in it that are being left behind. Its also hard on the piston. Mix your pump gas 50/50 with a race gas. you should clean the carbon out of the header and the valve area to alow for good flow.

Share this post


Link to post
Share on other sites

Im with Vegas on the "if it aint broke dont fix it" deal. But my header is grey on the inside. Heck, its grey all the way to the tail pipe

Share this post


Link to post
Share on other sites

Well Shawn

if ya show up in Forest Hill in Sept, I wont have a beer but I will crack a Sarasparilla with ya :)

Share this post


Link to post
Share on other sites

I have heard the pump gas explanation before also. I use race fuel.

I totally agree with DaveJ. I run my bike lean on pilot circuit which gives me quick starting and a snappy throttle. I run it fatter on the top. This combination works best for me.

Share this post


Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!


Register a new account

Sign in

Already have an account? Sign in here.


Sign In Now
Sign in to follow this  
Followers 0