There is a ignition modification for the rotax 912 motors called a "soft start module"
I haven't experienced it but the claims are that it smooths out the sometimes very harsh starts and kickbacks in the 912 Rotax. I believe it is designed for the 100hp high compression 912 but it is beneficial for the 80hp 912. Many regard the harsh starting and stopping of the 912 (particularly the 100hp) as being very tough on all the engine components, particularly the sprag clutch. It is important with the Rotax motors to get your starting and stopping techniques correct. Otherwise you are loading items like sprag clutches severely. Plenty of "how to" guides around the net. Have a look at this review of the soft start module. https://www.youtube.com/watch?v=koUsBqTQJ5I Rob Thompson 0429 493828 From: [email protected] To: [email protected] Date: Tue, 26 Aug 2014 19:37:17 +0930 Subject: [DOG mailing list] Super Dimona Starter Motor Hi I am Colin Turner President and CFI of the Scout Gliding Club in South Australia.The Scouts own a HK36TC Super Dimona which is having starting problems.Ever since we purchased the Dimona from the Scouts in NSW it has always been rough to start.The starter motor never turns the engine over smoothly it is always jerky but up until recently it has always started relatively quickly.Of late it has become much more jerky and it takes a lot of attempts to start it. The battery is a year old but it is still reading reasonable voltages no load and loaded. I have attempted to start it jumpering another good battery with no discernible change.The starter relay cuts in OK and the starter motor seems to run smoothly but what appears to be happening is that the starter clutch is slipping. It is now at the stage that it is serious enough not to use it. Has anyone had similar problems who could perhaps give an opinion of the possible cause and what would be involved to fix it? Regards C. R. TurnerBranch Commissioner Air Activities Scouts SAPresident & CFI Scout Gliding Club
