halliday77
XS650 Enthusiast
Hi guys,
I've all but given up on this and I'd love some advice.
I just stuck some new Mikuni VM34's on my '81 XS, along with some aluminium intake manifolds and K&N filters. Bought the whole kit from 650Central, pre-jetted for my stock setup.
I can get them to fire and idle very rough with the chokes on, but as soon as I switch the chokes off, it dies. If I give it some gas, it dies. No amount of adjustment seems to make much of a difference.
My vacuum gauges are reading 'bad valve timing or manifold leak', so I'm thinking it's a timing issue, but if it was running fine for a month before the swap. How is it possible for my timing to suddenly change?
Thoughts?
Some back story: The bike was running fine on a full stock setup (including original BS34's) until about a month ago. I was out riding and just about ran out of gas. The bike started struggling and coughing at the lights, but I managed to turn it around and fill up. Once i got some gas back in the tank though, the shitty idle remained.
I figured the BS carbs had had it, and I had the VM's anyway, so when I finally sourced some new lines, I fitted them. But the shitty idle never went away.
So I'm starting to think it's a timing issue. I was going to strobe it today, but the battery's too flat to turn it over, so it's on charge overnight. I tried to kick it over and it fired halfway down the kick and nearly snapped my damn foot off. What's the story there?
Otherwise, I've got Hugh's PMA kit sitting here on my bench awaiting the delivery of my new Pamco kit, so hopefully I should have a good shot at sorting it out when I rip all the old crap out and replace it.
Thanks for your tips and your time, friends.
Cheers.
I've all but given up on this and I'd love some advice.
I just stuck some new Mikuni VM34's on my '81 XS, along with some aluminium intake manifolds and K&N filters. Bought the whole kit from 650Central, pre-jetted for my stock setup.
I can get them to fire and idle very rough with the chokes on, but as soon as I switch the chokes off, it dies. If I give it some gas, it dies. No amount of adjustment seems to make much of a difference.
My vacuum gauges are reading 'bad valve timing or manifold leak', so I'm thinking it's a timing issue, but if it was running fine for a month before the swap. How is it possible for my timing to suddenly change?
Thoughts?
Some back story: The bike was running fine on a full stock setup (including original BS34's) until about a month ago. I was out riding and just about ran out of gas. The bike started struggling and coughing at the lights, but I managed to turn it around and fill up. Once i got some gas back in the tank though, the shitty idle remained.
I figured the BS carbs had had it, and I had the VM's anyway, so when I finally sourced some new lines, I fitted them. But the shitty idle never went away.
So I'm starting to think it's a timing issue. I was going to strobe it today, but the battery's too flat to turn it over, so it's on charge overnight. I tried to kick it over and it fired halfway down the kick and nearly snapped my damn foot off. What's the story there?
Otherwise, I've got Hugh's PMA kit sitting here on my bench awaiting the delivery of my new Pamco kit, so hopefully I should have a good shot at sorting it out when I rip all the old crap out and replace it.
Thanks for your tips and your time, friends.
Cheers.