Quote:
Originally Posted by NathanTC
I did pretty much exactly what you described here. Starting with the needle in the middle position, and riding the bike at different throttle positions to see if it's surging popping or giving any other weirdness. Then after riding I pull the plug and see what the plug looks like.
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That is not quite what I suggested to do.
I am specifically stating to check the plug only under certain conditions by performing a plug chop in those exact conditions. Checking it after just riding around checking every throttle position will not net the desired result. Running the bike in that specific condition for a period of time and then cutting the ignition off then immediately checking the plug will give you a much more accurate picture of what is going on with that specific jet.
My suggestion = narrow focus on specific throttle position to identify individual jet tuning.
Something else worth looking into is the float height. I noticed on my PE28FL that the float was set rather high. It would actually spit fuel out of the mouth if I cycled the throttle. Keihin's spec for the float height is 14mm on a PE carburetor, but I did my own digging and found that many other bikes that run PE's they set the floats to 18mm due to similar issues. This might be worth looking into, and could also explain that off idle bog.
Generic guide on how to set the float height.
https://www.jetsrus.com/FAQs/FAQ_flo...djustment.html
I will agree with you on one thing about the flanged carbs in general, this or even the stock PZ carburetor. Removing the carb to change jets is really annoying. I 100% get your frustration.