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Just rebuilt my 81-650 with a new big fin cylinder, new timing chain and at idle you crack the throttle it back fires through the exhaust (2 into 1). As you let the clutch out and give it gas it stumbles and misses until about 1/4 throttle and then it runs fine. When I was installing the...

bought new big fin cylinder from Mikes and there is no relief for the o'rings at the bottom of the cylinder sleeves. #2 do you use any gasket sealer on the cyl. or head gasket and #3 do you use anything on the head bolts for torquing i am going to use copper washers

bought a cylinder kit from mikesxs and the rings that come with the kit do not seem to be marked as to what side is up and ideas

does anybody have a pic of the bottom of the head i am trying to see which way the little stamped metal piece goes back in it is the piece that goes over the oiling hole

Ok guys my motor a 1981 650 checks out as follows compression Hot 150- 150 after 5 min. 148 - 147 but i can not get the oil to stop from coming out of the breather and it is making a mess. as it was running i took the oil dip stick out and there is a lot of air and a slight mist of oil i...

1981 xs650 i do not know exact model .I need the valve clearances thanks for the help when I'm done pics to come

rebuilt my carbs 're jet kit from mikes "the 81 34s are so lean from factory" and was having hell setting idle ether to high then it would idle down to low crack the throttle and spit threw carbs and quit they are balanced . I got frustrated and got a piece of hose and connected the two vacuum...

was adjusting my chain tension on my 1981 and turning motor counter clock wise and it is flush except one spot it pops out when i turn it over then back to norm.Motor runs great and oil filter clean. Any thoughts

what spark plug gap do you all run with a powerdynamo ignition system thanks all

ran the valves today on my 81 xs650 and they were off int. calls for .0024 that sounds close to me and .006 on ex cold. Does that sound right to you all I am used to running valves on my race car. It would not idle very well so the carbs came off to put the jet kit in from Mikes and found...

can you all tell me were i can buy a 530 16 tooth sprocket for a 1981 sx 650

new guy here got a 1981 sx650 bobber and the breather is vented with a tube and is makes a mess. the baffle is in place and i checked compression "hot" 95 ,90 no smoke and it runs very good . is a puke tank an option thanks

i have a 1981 sx 650 and i need to find a yamaha oil separator baffle can you give some places to buy one thanks