jetting carbs

Hey all been a while since i posted on here but ive been around reading old threads finding answers through other people problems for the most part. Now I got my own set of questions that I haven’t found in other threads. (Please link me to others if I overlooked them) Ive got a 73 motor Hughes...

I just dismantled my carburetors. I can't remember the last time I was in them, because I don't keep records. I expect it has been twenty years or more. Here is what I found. The main jets are #137.5 The pilot jets are marked "30". My genuine XS 650 SJ Service Manual says Main jet #135...

I have a question about the jetting chart in the carb guide. The section for '70-73 shows two different pilot and mix settings. Am I reading this correctly that there were the settings specific for 70/71 (45P and 1 mix) and then 72/73 (42.5P and 3/4 mix)? Why the difference if so? Attached is...

Okay, so i have a 79 special with the bs38s pamco with E advancer and high output coil. Xs performance pods and commando megaphone mufflers with the removable allen bolts. Question is ive gone from stock 27.5 pilots to #35, and stock 135 mains to 142.5. Am i still due to go up more? As it seems...

Hey guys just join maybe an hour ago haha. So ive been searching through threads and various other places but can quite answer my problem. I have a 79 special with k&n oem style filters, pamco ingition with e advancer, and commando mufflers. The bike seems to be detonation under load between 2k...

Hi Guys, I just picked up a '76 XS650. PO informed me that he was having battery charging issues. I pulled the cover today and had a look. He had a mikesxs pma system installed and it was not charging the battery at any RPM (12.4 at all rpms...). The mounting plate was broken and only...

i'm putting a set of carbs off a 77 motor on to my 72. i have pods and free flowin exhaust. do i jet the carbs for the year of the motor or year of the carbs? stock jets are considerable differnt size between the different years. i dont reall know where to start so any help would be...