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Rotax 912s cold start problems

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kheindl(at)msn.com
Guest

Posted: Tue Mar 13, 2012 1:51 pm Post subject: Rotax 912s cold start problems

Tim,

I have been having exactly the same cold start problems as yourself with the 912s. I have tried a number of things that were suggested, and sometimes I see an improvement, but it always comes back. No problems on a warm day or with pre-heat. So, I have given up and will tow it next month to the local Rotax agent to look at.He thinks he is an expert and gives the courses, so it should be a nice problem for him, and the engine will be cold. No point in flying in.I have had the new starter for a long time, and it certainly helped. Looked at the soft start module,  but I could do the same delayed ignition by pushing my separate starter button, and then switching on the magneto four seconds later. I understand from others that the ssm is no guarantee for improvement anyway.If I have a fix I will be posting it.

Cheers,

Karl



[quote] From: ward.t(at)xtra.co.nz

 To: europa-list(at)matronics.com

 Subject: Re: Rotax 914 starting problems when hot

 Date: Wed, 14 Mar 2012 10:22:30 +1300

 

 

 

 Frans,

 

 Don't have a 914 but I know others who have suffered the same problem with 

 the 912S and , for what it is worth, they always

 open their oil and coolant doors on top of the top cowling to allow faster 

 cooling of the engine compartment during stopovers.

 

 Otherwise don't mention starting problems to me! I have now got to replace 

 my Sprag Clutch due to cold starting problems with my 912S

 at 300 hours!! Always had it and got worse with time. So watch out when 

 trying to persist in trying to start the motor as it quickly destroys your 

 Sprag Clutch. I have also the

 old mono "classic" engine frame which doesn't allow enough room for the new 

 Heavy Duty Starter which Rotax suddenly decided was

 necessary for the 100 HP 912S. So, after replacing the Sprag Clutch, the 

 Rotax man is going to look at how to fix the starting problem

 in cold weather. Maybe a case of redesigning the engine frame to allow for 

 the HD Starter?

 Once it is going there is no problems with starting, so I haven't got the 

 vapour lock problem.

 All a bit frustrating as you have found out and expensive. Might as well 

 throw in the 912iS, but that may unleash a different set of problems.

 

 Anyone have some input to my problem? Tried new battery, preheating the 

 engine which has helped, haven't tried the soft start module,

 and kicking the tyre!!

 

 Cheers,

 

 Tim

 

 

 

 Tim Ward,

 12 Waiwetu Street,

 Fendalton,

 Christchurch 8052

 New Zealand

 

 Ph; 03 3515166

 Mob; 0210640221

 

 email; ward.t(at)xtra.co.nz

 --

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Mark Burton

Joined: 10 Jan 2006
Posts: 74

Posted: Wed Mar 14, 2012 3:39 am Post subject: Re: Rotax 912s cold start problems

Howdy folks,



Cranking the engine and then turning the ignition on is not equivalent to how the Soft Start module functions. The purpose of the SSM is to keep the ignition retarded while the starter is operating. Given the fact that Rotax have now altered the ignition timing on new engines so as to retard the ignition even more during starting, it is arguable that the earlier ignition systems don't retard enough so, even if a SSM is fitted, there's still a chance that a kickback could occur. Having said that, I believe a lot of people who have fitted the SSM have seen a benefit.



Cheers,



Mark

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