I have been struggling to get one of my china girls to run nice. It has upgraded ignition from SBP's and a speed carb with a HD sports air filter (like all my bikes) - after trying 3 different jet sizes + all five needle clip positions for most of the 3 jets, today I left the #68 jet in but swapped the needle clipped #4 (from the top) for a standard NT carb needle clipped #3. This needle looks noticeably thinner than the speed carb needle but is exactly the same length.
Before the change she would 4stroke whenever I didn't have the throttle wide open and would only idle either very high or not at all.
She still has an unreliable idle but the mid throttle performance is suddenly superb!!!!!!!! thinner needle!! Who would have thought!
One of my other china girls was similar (kept 4 stroking) but without the idle issue - I had all but given up on it when I changed the exhaust for a longer poo poo exhaust (only because it wouldn't fit my other bikes!) and well blow me down - it suddenly had awesome mid throttle performance! What a nice surprise!!
John
Before the change she would 4stroke whenever I didn't have the throttle wide open and would only idle either very high or not at all.
She still has an unreliable idle but the mid throttle performance is suddenly superb!!!!!!!! thinner needle!! Who would have thought!
One of my other china girls was similar (kept 4 stroking) but without the idle issue - I had all but given up on it when I changed the exhaust for a longer poo poo exhaust (only because it wouldn't fit my other bikes!) and well blow me down - it suddenly had awesome mid throttle performance! What a nice surprise!!
John
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