An amazing amount of weld flash in the 650L headpipe

5 replies to this topic
  • lrutt

Posted March 17, 2005 - 04:24 PM


I had always heard of people cleaning up the stock headpipes. Well, since it was raining all day I decided to pull the head pipe and clean it up. I measured it before, about 1.01" diameter, both sides. I started griding and cleaning. Ended up with about 1.12" diameter both sides. Just over .1" extra diameter. That's a worthwhile effort.

Just some quantitative proof of what can be gained in case your interested.

  • DualSport650

Posted March 17, 2005 - 04:43 PM


I found the same thing the header of my old Honda XR600. :)

I ground out a lot of the weld, made the hole a lot bigger, and could feel the extra power after riding it.

Now I'll do the same to my XR650R... :)

  • Baxter650

Posted March 17, 2005 - 05:40 PM


I went one step more and wrapped the head pipe with header wrap. It made a notable improvement but now it is backfiring again. It must be scavenging the cylinder better. I will order richer pilot jets again and see what happens.

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  • DualSport650

Posted March 17, 2005 - 06:00 PM


Ceramic is good.

I got mine ceramic coated at the auto performance shop and it looks great and mud does stick to it and discolor it anymore... :)

  • x400r

Posted March 18, 2005 - 07:07 AM


How much does the ceramic coating cost?

  • DualSport650

Posted March 18, 2005 - 09:55 AM


Ceramic coating cost me $60-80. I don't remember exactly.

It's worth doing. Post a new thread to the list. Someone here knows a good ceramic coatings place that you can mail your header to...

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