1993 XP won't idle

[dandlwelder]

Have a tough one,at least it has me stumped, have a 93 XP which I did a top end replacement last year, due to a oil pump failure a few years ago that finally ruined piston rings in one of the cylinders. Did not mess with the carbs or intake manifold/ rotary valve etc with the rebuild, and ski appeared to run well with some hesitation after the fix for 3 hours or so. Then it would not idle. Runs like 20 -50 seconds before dying, can't tell if it bogs down or is starved for gas. Any hints on how to tell the difference? I adjusted the idle mixture screws from 1 1/4 to 2 1/2 turns out from closed. Seems to run a bit longer at the 2 turns out range, Lots of smoke upon starting stumbles, misses, then dies. Will restart again but then stumbles and dies again dies again. Because of this, I rebuilt carbs, cleaned all fuel filters, adjusted pop off levers, tested pop offs, rebuilt fuel pump. Did not mess with the valve clearance or sync bar between the carbs, as it worked fine before I had the problem. Don't imagine that the sync bar between the two carbs would change. I was the only person who worked on this ski in 12 years. I did not actually check on the relative throttle plates between the carbs, I just assumed it could not change on its own since it was running fine before I blew the piston. Also did not measure the valve clearance, but the ski does the same thing now that it did before the carb rebuild.

Heard on another post it might be lower end crank seals, causing the oil?

How much pressure should you get from the pulse hose to the fuel pump, seems real low, when checking with finger pressure.


Any suggestions?
:banghead:

Thanks

 

[6KJR]

Odd problem you have. Have you tried leaning it out a little to see if it would idle better? Mine gets mad when its too rich and idles low, then will foul out. Looks like youve looked after your carbs so Im wondering if its a spark issue/weak spark. I just put a new coil in mine and it brought it right to life.