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. Starter jet #80.
My parts catalog says Main jet #135. Starter jet #42.5.
On the first page of XS650SK 1983 SERVICE DATA the carburetor jetting is listed as 132.5/42.5.
OK. The bike is running OE airboxes with K&N filters installed. The exhaust is OE with the baffles knocked out. This bike almost always starts on the first kick, even after sitting for months at a time. Since the top end was pretty worn out, the spark plugs are black from excessive oil. I did not detect signs of running lean. 45 to 50 mpg.
At this point, I don't know whether to leave well enough alone or rejet to the SERVICE data.
I have no clue how it came to be where it is. Please advise.
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. Starter jet #80.
My parts catalog says Main jet #135. Starter jet #42.5.
On the first page of XS650SK 1983 SERVICE DATA the carburetor jetting is listed as 132.5/42.5.
OK. The bike is running OE airboxes with K&N filters installed. The exhaust is OE with the baffles knocked out. This bike almost always starts on the first kick, even after sitting for months at a time. Since the top end was pretty worn out, the spark plugs are black from excessive oil. I did not detect signs of running lean. 45 to 50 mpg.
At this point, I don't know whether to leave well enough alone or rejet to the SERVICE data.
I have no clue how it came to be where it is. Please advise.