CVO Technical > Twin Cam
2 failed 107 builds
HD Street Performance:
What about the tune? Was this done by dyno with AFR monitoring.
You say crank is stock. Did you check runout and for stiff rods?
BarrySEUltra-103:
No dyno ,thundermax with auto tune adjustments and i made some timing adjustments to take out knock . I had sticky rods the first failure had the crank rebuild trued and welded. Thinking that was the culprit but now i have a second failure in the exact same way and timing. Both failures were in 5th gear 100+mph under load 4500 rpmish zippers seems to think its a oiling issue and want me to check the camplate its a new s&s plate and pump
HD Street Performance:
What was your cleaning routine before build #1 and #2. Was the oil pan replaced? All lines and passages cleaned and bottom end disassembled and reassembled?
And the wide bands.. are they right out of the heads in the pipe? Thundermax, as you know, uses throttle position and RPM to direct fuel delivery, what was the target AFR at your 40% ish throttle and 4500 rpm?
BarrySEUltra-103:
--- Quote from: HD Street Performance on July 15, 2025, 09:37:11 PM ---What was your cleaning routine before build #1 and #2. Was the oil pan replaced? All lines and passages cleaned and bottom end disassembled and reassembled?
And the wide bands.. are they right out of the heads in the pipe? Thundermax, as you know, uses throttle position and RPM to direct fuel delivery, what was the target AFR at your 40% ish throttle and 4500 rpm?
--- End quote ---
There was no failure before build one bike was a perfectly running 103, after the first failure eveything was gone threw . As for the afr i dont know that atm . Wide bands are up by the heads
BarrySEUltra-103:
13.7 at 40 degrees wot 13 flat
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