carbmate

Dear Benny,

I agree with Sean. Sometimes for specialists its not easy to make it in perfection. Your questions make me speechless. Are vou the legal owner of the engine and the carbmate? Send us the origin serialnumber of the engine and give us your location in detail. Maybe then we can find out a specialist for you.

Related…. I like the Carbmate, but it took me awhile to understand what it’s readout was saying. The instructions are not clear on this. Let me if others experience is the same.

On a dual mechanical guage setup, if one side reads high (high vac), that implies that the throttle on that carb is set relatively low and will need advancing (or need opposite carb throttle reduction). On the Carbmate, it seems as though a high reading on one side indicates a relative low vacuum. So, a high reading requires LESS relative throttle on that side. Until I figured that out, the device was obviously frustrating to use. Now that I know how it works, it’s great.

Howdy Robert,

When using dual analog gauges and you're at the higher rpm setting you adjust the carb with the lower number. That carb is getting more fuel then the one with the higher vacuum. If you make the one with the higher rpm match the lower number then many times you won't be able to set the idle because you lengthened the cable on the higher vacuum number side. Plus it's ten times easier to diagnose issues with gauges vs the electronic devices. In about 15-20  seconds I can tell you many things good or bad using the gauges. 

Thanks Roger. Wish I had your keen eye, I have the dual guage from Lockwood. Only used it once and found it difficult to get the two sides close. Then, used Carbmate after using gauges and was able to fine tune things nicely.

My main point is that CarbMate reads opposite of intuitive compared to gauges. Carbmate is essentially indicating the side that has “more throttle” set.

This is what I use - Motorcycle carburettor synchronisation gauges $30-$40 Australian - work like a charm. I purchased additional long length of vacuum hose, so that I can have the gauges in the cockpit.Vacuum hose enters cockpit through vents.

Just follow the Rotax instructions,  starting with the preliminary mechanical set up and then do your vacuum fine adjustment - cant go wrong.

Gauges can be easily checked for identical reading and if need be "zeroed"  before you start. 

When all adjustments done, to your satisfaction - swap hoses on gauges, to check for any reading errors (I have never had one).