Replies to This Discussion

Permalink Reply by Ken Ryan on January 12, 2019 at 10:29am

Your analysis seems sound to me. I wonder if you are supposed to use the top fitting as the overflow outlet and you are supposed to install another fitting in the bottom as the inlet. I would not install an overflow bottle with only one fitting on the top for the exact reasons you state. Note that you can get a very nice bottle from Rotax. You can find the part number in the illustrated parts manual.

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Permalink Reply by Harmen van der Velden on January 13, 2019 at 6:14pm

look at the bottle , the top entry point ends up on the bottom of the reservoir, just like a medical irrigation bottle  works. venting is either from leak at the threads or a small hole at the top. attachment to the firewall is easily done with a'' bicicle cage''

.Sometimes  the simple solution is the best.  450 hrs with this set up and no problems

harmen

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Permalink Reply by Jim and Amelia Isaacs on January 13, 2019 at 6:22pm

Thanks Harmen, did you drill a vent hole at the top?

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Permalink Reply by Jerry Griego on January 13, 2019 at 11:11pm

The bottle that comes with the FWF package works just fine , just follow the instructions. Harmen van der Velden is correct.

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Permalink Reply by Jim and Amelia Isaacs on January 14, 2019 at 5:02am

Thanks Jerry.  The only written instructions I can find are the ones in the Rotax Installation Manual and they specify a 2.5mm vent in the bottle is required (there was a SB about this for older Rotax OEM bottles).  It appears the FWF irrigation bottle works, so I will use it but I think I’ll drill a vent in the cap.

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Permalink Reply by Paul Sanders on January 14, 2019 at 4:54pm

The instructions that come with the fwf kit say to drill a hole, it is even underlined!

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Permalink Reply by Jim and Amelia Isaacs on January 14, 2019 at 6:02pm

Paul

LIB.  I found your posted photo in the old bed mount instructions.  I have the new ring mount so those were the instructions I am using, and the ring mount instructions don’t have this portion of the bottle mount. 

Thanks

Jim

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Permalink Reply by Charles Causey on January 16, 2019 at 9:06pm

I thought the rotax fwf was completely plug and play. How is it going? I have been away for a while, haven't been able to check on this site. Charlie

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Permalink Reply by Jim and Amelia Isaacs on January 17, 2019 at 1:27am

Hi Charlie

Progress is occurring albeit at a slower pace than I’d like. The FWF kit contains the major components one needs but there’s much it does not contain in recognition that every builder tailors this phase of the build to their particular wants. At this stage one must pause and complete a detailed design of their electric and fuel systems to include placement of every item, routing of cables and hoses, etc. and there are constraints and delays simply due to a lack of my understanding, experience, or location (or sometimes lack) of information.  But I just keep showing up and having at it every weekend!

As always you’re welcome to come visit and see the build. 

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