BurntTimber
XS400 Member
Two problems, one thread. I know I'm giving myself trouble, but want to make sure they're not related.
Problem One: Petcock
So I used the petcock rebuild kit, but am having a significant issue. The only runs out of the petcock when I've got it set to PR (Prime?) but won't flow when set to ON or RES. Now I know this is a vacuum petcock, but even with the line hooked up to the intake, the bike runs out of fuel and dies.
Should I just replace the petcock with one of these: https://www.mikesxs.net/product/20-0019.html
Problem Two: Running lean
So when I set the petcock to "Prime", it starts and runs beautifully. Nice smooth idle, no issues. That said, after I run the bike on the road through the gears. after about 10 min it starts to backfire, run very rough, and eventually just craps out. I know this means it's running lean, but the carbs are running so smooth when it first starts it feels like it's an airflow issue.
Anyone have some thoughts on why it would be running so lean with factory set carbs? P.s. the bike didn't run for 30 odd years, but was properly drained, and fired up beautifully once I did the basics.
Problem One: Petcock
So I used the petcock rebuild kit, but am having a significant issue. The only runs out of the petcock when I've got it set to PR (Prime?) but won't flow when set to ON or RES. Now I know this is a vacuum petcock, but even with the line hooked up to the intake, the bike runs out of fuel and dies.
Should I just replace the petcock with one of these: https://www.mikesxs.net/product/20-0019.html
Problem Two: Running lean
So when I set the petcock to "Prime", it starts and runs beautifully. Nice smooth idle, no issues. That said, after I run the bike on the road through the gears. after about 10 min it starts to backfire, run very rough, and eventually just craps out. I know this means it's running lean, but the carbs are running so smooth when it first starts it feels like it's an airflow issue.
- I do have some cracks in the intake carb holders so I've got some on order
- I'm at a high elevation here in Calgary too, so it should be running rich
Anyone have some thoughts on why it would be running so lean with factory set carbs? P.s. the bike didn't run for 30 odd years, but was properly drained, and fired up beautifully once I did the basics.