by jeffmort » Fri Jan 20, 2012 3:32 pm
Great instructions. I decided to perform this mod on my hard to start when cold 07 CRF250R with Athena big bore kit, Ron Hamp ported head, and Ron Hamp Webcams cam. The instructions were very easy to follow and the mod was easy to complete. I am confident that I did the job correctly, used dremel slowly, checked with calipers, etc. In my case it did not help with my starting problem.
My valves are all in spec, carb is clean and bike runs excellent - is is just difficult to start when cold. I actually called Ron Hamp yesterday to ask him about it. He told me that the mod does not always work and in my case because of the big bore kit that I should probably go back to an unmodified decomp pin which I have done.
I am stoked for all you guys who this mod has worked for and I would guess by the rate of success it is worth trying - worst case is that it does not work and you are no worse off of for the effort (just a little time and maybe needing to buy a new decomp pin).
Just letting everyone know my results.
Jeff
2007 CRF250R