Austrian Rotax
Active Member
Hey Guys,
So on my last ride of the season this summer whenever I let off the throttle the ski would die unless I feathered the throttle very carefully but still most of the time it would die regardless, some history on the carbs is I had to run two different pop-off springs to get same pop-off for both carbs, couldnt find any issue with the method i was useing to test pop-off so not sure why but the ski ran great for whole season up until the last ride, it still accelerates strong and hit a top GPS speed of 94km/hr (58.4mph) on that day, I guess having single ring pistons and a SC-XO prop without intake grate helps a bit and my 150lb self. For the occasional time I could stop it from dieing if I punched the throttle right away it would not react quick and was very slow indicating not enough fuel in carb I think. Only other work I did if I remember right is I replaced the fuel pump and associated check valves (little round plastic discs). Only conclusion I can come to is the check valves maybe are bad either because I damaged them a little on install or because they were from a WSM carb kit. Thing that gets me is it ran for approx. 10 hours no problems.
I guess my question is what else could it be? The ski will run WOT all day and carb is clean. Just want to make sure I am buying the most probable part that is bad as I dont want to buy a full carb rebuild kit. Thanks
So on my last ride of the season this summer whenever I let off the throttle the ski would die unless I feathered the throttle very carefully but still most of the time it would die regardless, some history on the carbs is I had to run two different pop-off springs to get same pop-off for both carbs, couldnt find any issue with the method i was useing to test pop-off so not sure why but the ski ran great for whole season up until the last ride, it still accelerates strong and hit a top GPS speed of 94km/hr (58.4mph) on that day, I guess having single ring pistons and a SC-XO prop without intake grate helps a bit and my 150lb self. For the occasional time I could stop it from dieing if I punched the throttle right away it would not react quick and was very slow indicating not enough fuel in carb I think. Only other work I did if I remember right is I replaced the fuel pump and associated check valves (little round plastic discs). Only conclusion I can come to is the check valves maybe are bad either because I damaged them a little on install or because they were from a WSM carb kit. Thing that gets me is it ran for approx. 10 hours no problems.
I guess my question is what else could it be? The ski will run WOT all day and carb is clean. Just want to make sure I am buying the most probable part that is bad as I dont want to buy a full carb rebuild kit. Thanks