Allen's B5 was one of the loosest B5 sets I inspected over the months. Check conrod-crank pin clearance, front bearing, along with air filter conditions.

I re-broke in "my" resized B5, with 5-6 gallons, this past Saturday.

I first replaced front bearing early last week before resizing process. Please note my engine has seen extreme cases loose loomy race/practice night track conditions. very tough on all engines.

I re-broke in my B5 resized "light-medium" tightness as follow:

1) Richined high speed needle 1/2 turn.
2) Pre-heated with Competition Heat and started on box and brought to aprox 210F, shut down and cooled. Piston BDC
3) Repeated above one more time. First preheating with Competition Heat. Not quiet a tank ran total thus far.
4) Ran one tank (second tank) preheated and on the ground at home on drive way.
5) The third tank I ran on the ground at PA club race durring practice time made available by track director inbetween qualifiers, their 15 minute break. We got their alittle late missing 1st qualifier.
6) The 4th tank was my second qualifier. Flamed out at start, restarted in time to start on time. Running on rich side. Got to expect it a tad on the squrely side untill first 4 or 5 tanks. Nature of the Beast
7) The 5th tank was my third qualifier. Still running on the rich side.
8) Leaned HS needle 1/4 turn and ran 15 minute main tanks 6 and 7, with mabee 1/2 tank durring warm up. Came off the track slightly above 220F. Performed well.

Hope this helps you and Allen

RayAracing