Photos from Bruce McGregor's post

At the suggestion of Paul De Doncker I have taken the valve pockets off the THR pistons. I am having all sorts of problems with cam timing so I stripped the whole bottom end today, modified the pistons and re assembled. I will be able to do this with my eyes closed shortly. (except for the adjustable cam timing)

12 comments
  • what piston did you use? Wiseco?

  • They are made by Wiseco but sold by THR.

  • Taken the valve pockets off?

  • Yep.

  • I don't understand

  • Aussie slang. Yes taken the valve pockets off.

  • Lol... what does that consist of?

  • Removing the fly cut relief completely from both intake and exhaust sides. Back to the dome.

  • Ok. How does this help?

  • Assists with airflow across the piston crown.

  • Doesn't it reduce compression?

  • It would by a very small amount.