Roger that on The Castrol GTX.....that oil is good enough for the high reving bikes as it's racing oil for cars with all the added protection...
Try Autozone,Pep Boys,or most any auto parts store.just call them first. you may also want some better spark plugs(.032 gap for iridium type) and...
Add some Berrymens Chem Tool to the Tank......get it at most auto parts stores $2 something a can. If that don't clean it out you'll have to do...
The 650 turbo has 127.5 or .050 thousands holes and the outter 132.5 or .052 thousands holes on the inners( one jet size larger) on the Makuni Carbs.
Middle jets reguardless of TURBO or not on inlines need to be richer because the middle of the engine gets hotter, there not exposed the the air...
U win the prize
The 2 inner main jets are one size bigger than the outter........you know why????
Blue smoke usually means bad rings, black means rich mixture. sometimes if the OIL ring is bad it can foul out that plug.
Good idea takin the spare that filter is a looker and seems to be well made.......Off the subject a little but about fuel for the older bikes I...
I would advise checking them after one seasons use.....you wont believe the crap fuel out there today.
carefull,,, those small filters clog up quick and as metioned above need lotta gravity
hard work sets you free and so does Iridium Plugs...and they gottum for the XJ's (.028) gap......
almost forgot.........make sure you have a good battery., sometimes there are weak cells that fool you into thinking it's a good battery
If your sure it's back together correctly ,then just attach the leads of ANY 12 volt battery to test, or reinstall it back on the bike and...
there R Magnets...permenant type