Dick Maddux
Joined: 24 Jun 2008
Posts: 516
Location: Milton, Fl
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 Posted: Fri Jul 29, 2011 4:15 am Post subject: 912 model IV engine idle912 model IV engine idle |
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As I recall (it has been awhile) the rubber tips on the new needles were a different color than the old ones(red vs black or maybe the other way around)) I always keep my old parts so was able to reuse the old needles as they were changed per the time limit on rubber parts BUT appeared to be in good shape.
I called Lockwood after installing the new needles,and explained the problem I was having with the new needles. They told me that Rotax had used a stronger spring in the new needles to keep the needles from bouncing on the seats. Rotax did this in order to prevent what was happing from happening. Well ,it didn't work in my case so I decided to reinstall the old needles and that solved the problem. I have also reinstalled the old oil pressure regulating ball and spring on my engine as their new "cone" had my oil pressure bouncing all over the place. AND you might safety wire your oil filter while your at it because I had one of those almost spin off my engine and Lockwood said that couldn't happen either (it was tightened properly)
Anyway I digress. Hopefully you haven't chucked your old parts. If you have, I have an old pair of carbs that MIGHT have the old needles that you could try. I bought them off of EBAY a few years ago. I don't know where you would get new old parts OR if the old needles will solve your problem but with so many guys here going back to the old needles, I would think that is a strong possibility.
Good Luck !
Dick Maddux
Fox 4
Pensacola,Fl
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