3
« on: April 06, 2009, 09:39:26 pm »
Hey guys
Ive got a 691 twin with a precision cam from ec, roller rockers, stainless valves double valve springs, big carbs done by me, its got just about all the good stuff.
It idles fine but when you give much throttle it starts missing after around 5 laps, before the 5 laps it runs great.
I checked fuel pump output and its great.
I changed needles and seats and cleaned the carbs 10 times.
I changed the main jets and emulsion tubes.
The valves are adjusted to .004 right on.
I changed both coils and diodes.
I tried champion, autolite and ngk sparkplugs. Spark is excellent.
It has 120 psi compression on both sides.
Did a leak down test with no abnormal leakage anywhere.
Syncronized the carbs by the book and with vacuum guages.
No intake or head gasket leaks.
Ive tried 87, 91 and 115 octane gas. Changed fuel filter and gas lines.
Am I missing something???? I cant figure this thing out.