 help post 95ci stage 3 build
Help!!!!
OK, here is the version of a epic story.
Equipment:
2002 FLHT, stage three rebuild:
1550 ci SE Cast High Compression Pistons P/N 22661-99A
Heads ported, polished, oversized Valves (1.90 Exh can’t remember intake size),
Rocker boxes clearanced for 600 lift and oversized valves
SE valve springs
SE adj push rods
Headquarters Black ops lifters
Headquarters 0039 575 lift Cams
“new style” HD cam plate with high flow oil pump
CV 40 mm carb, complete high performance rebuild currently with .200 and #48 jets
Vance and Hines high flow Air Filter
Rinehart True Duals
TwinTech Ignition Module and TwinTech coil
generally runnibg at 5-6000 feet elevation (MSL)
Ok here is the problem:
After the rebuild, front deck height showed front piston -0.005 below deck and rear +.005 above. This caused obvious piston impact on rear cylinder when using a Cometic 0.030 head gasket. Went to a stock HD 0.045 gasket. No more impact “appreciated”.
Initial run of bike showed a lot of pinging at 2500-3000 rpm under load, bike ran hot. Adjusted ignition curves from mid point recommended starting settings of #5 advance and #7 slope setting on TwinTech igniton. Eventually adjusted ignition curve slope all the way back to 0 ( not degrees just the setting 0-9 available ) and Advance to 0 ( not degrees just the setting 0-9 available ) after many other trial combinations. Seemed better to the point I and mechanic felt 500 mile break in would be safe / OK with the 0 advance 0 slope setting at 60-70 ambient air temp.
During the break in the environmental temps were in the 70s and not much problem noted. However, when the environmental temps hit 85-90 degrees, back came the "ping / clack". Now, noise is present only under near or wide open throttle and under full load, up hill, 4-5th gears, 2400- 3000 rpm. OK, 500 miles have past. I can run it up in the rpms and load the engine. Exhaust tip deposits at very limited in amount and a light grey. Plugs look perfect, tan to light grey. Engine seems to run hot? ( temp). Runs unfreaking unbeliable above 3500 rpm, great torgue on low end.
Next "cure" was to go from the installed 195 and #45 jets to 200 and #48 jets in an attempt to run less lean, thus cooler and avoid pre-detonation. I also installed HD deluxe oil cooler, changed oil from "Dino" oil 20-50w, to Amsoil 20-50w, tired 93 octane.
Engine ran better ( ?), front wheel lifts off the ground shifting from 1-2 or 2-3rd about 5000 plus rpm shifts ( maybe it would have before but 3000 rpm limit was not broken. STILL "PINGS" at 2400-3000 rpm under WOT and load ( up hill ). Maybe clacks is a better word. I have never heard any "pings" above 3200rpm all the way to 6200 rpm. Makes me question that predetonation is an issue.
Now I am thinking that the "pings" I am hearing ma be the rear piston slapping the head due to piston/rod elongation when the engine is hot with associated piston/ rod stress elongation and not really pre-detonation.
I am I crazy about this assessment?
I am thinking that I need to measure the squish bands and adjust the head gasket and or base gasket thickness.
I have the data link software to upload new ignition curve maps but none seem avail on the net for carb models. I am at the point of scrapping the whole tamale and starting over with new heads and cylinders ( yuk).
ANY thoughts about this will be greatly appreciated.  | 
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