nlappos

For my 670 in an Avid Mk IV, Mike Hair made a very nice exhaust by modifying my 582 pipes, at a reasonable cost. 

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Would it be easier on the bench if you removed the entire starter first?

Many of us do not use the tach gauge, the Tiny Tach is much more accurate and much more reliable. Beware of the china tiny tach copies, they can be very unreliable.

You have a beautiful airplane, good luck!

Just to support your point, most cases of engine failure are related to the pilot letting too much air into the fuel tanks.

Just to be sure data was what runs our decisions and not internet rumors, here is some real data, drawn from an Australian report of 6 years of light airplane experience (they were hunting Jibaru issues) that compares Continental, Lycoming, Rotax and Jibaru experience.

The report is here : https://www.atsb.gov.au/media/5769864/ar-2013-107-final-report.pdf

Note how similar Rotax is to Lycoming and Continental, hardly a "piece of rubbish waiting to kill you" frankly. Note that a Lycoming engine can be a little more of a safety issue than a Rotax, and that the total engine failure probability of a Rotax is only about 20% higher than a Continental or Lycoming.

What East TN Flyer doesn't know about engines has built an entire fleet of good, light, inexpensive and capable engines like the 582 and its cousins. Who picked the two strokes for the Avid line? The designer of the family, a near genius as an airplane designer and a guy who created the Avid/Kitfox light sport fleet, that's who. For those new guys who look at this site for advice and discussion, pls know that many of us completely disagree with East TN Flyer.

ChrisBolkan is right on, and for a shimmying tail wheel, the fix is to put more torque on the pivot bolt, which adds friction damping to the tail wheel rotation. Usually there is a wavy washer below the bolt head that can be sequentially crushed until shimmy disappears, see item 3 in the below print.

document1.pdf

Jeromef, EBay!

Rotax 582 Replacement starter (Rotax PN 995430) choices:

Cheapest (same part number) $65!! , https://www.discountstarterandalternator.com/p/new-starter-ski-doo-snowmobile-410-207-500-995430/

What I bought, $195  https://www.ebay.com/itm/233052881422

Aircraft Spruce, $262  https://www.aircraftspruce.com/pages/ep/starters_xrotax/gplheavydutystrtrmtr.php

Rotax Pricing $903 (but this is a full kit with housing and gear, not a fair comparison)  https://www.air-techinc.com/product_detail.php?pid=2442

I had to replace my starter and decided to0 make a rear access hole instead of pulling the engine. Here is the story with pictures. http://avidfoxflyers.com/index.php?/topic/6443-how-to-pop-in-a-new-starter/#comment-58495

TJay,

Yep, the 2 strokes have great power to weight, but poor fuel economy and the mess of the mixed oil. I think the internet myth about 2 stroke reliability is just a myth. I saw some data from Australia when the authorities were studying the Jab failures, where the 2 strokes had just about the same reliability as the typical Lycoming or Continental.

Let me add the 91 HP Rotax 670 to this list. I pulled the 582, its 2 bladed Culver wood prop and the 6 qt oil tank, added the 670 and its exhaust, a Warp Drive 3 bladed prop, a belly radiator, and a Highwing LLC landing gear (same wheels and tires), and a double tail wheel spring. The airplane weighs 21 lbs more after those mods.

 I would bet the 91 HP 670 is about 13 to 15 lbs heavier than the 65 HP 582, including the belly radiator and prop.

My Avid MkIV has this system. I have a 4 psi boost pump, continuously on, in the engine compartment that feeds the engine pneumatic pump, just in case.

109jb,

Nice airplane!  Good luck.

Can I suggest you mount a boost pump to feed the engine, and leave it on constantly. A good one from Aircraft Spruce, with 4 psi. It is a great insurance against excessive quietness.

Congratulations and Good Luck, you will have a blast. 

I have a Rotax Rick 670 and it is great, a drop in for the 582 and a true 91 HP powerful engine. Since a Rick overhaul is about $2200 and the 670 is about $3600, it is a no brainer to send the old 582 and get a nice zero time 670 in its place.

For common hardware, I suggest getting a cheap Harbor Freight digital caliper and miking all the bolts yo want to swap for new, that way you get exactly the right ones. Aircraft Spruce has great data tables with exact dimensions to make it easy.

Questions? Just post them, lots of experienced guys here helped me get mine up, they are great fellows.

It seems that most Americans run out of TP fast for the same reason I do, I use it to wipe my TV screen whenever trump gives a speech.

Dont worry about us squeezing the aftermarket for Yamaha engines. They make 100,000 to 200,000 snowmobiles a year......

Well, AK you have your priorities right! When Richard Bach was a starving writer, with a wife and 2 kids, they came to repossess his family car. He let them, but kept his airplane!

To view all his great pictures, just add .jpg to the name of the file. This tells your computer to treat it as a JPG picture file.

I really like this post, brilenz, you lay out the whole process. Thanks!

I used a dual spring from Wausau Springs, (715) 845-6335, at about $75. Nice guys, strong springs.

Good Luck! Great project!

Here is a wing construction document that is most helpful. I am searching for a supplier for the spars, and will post it when I find it.

2.5" x 1/16" x 144" tubing: https://www.extrude-a-trim.com/aluminum-extrusions/aluminum-tubing/aluminum-round-tube/9

2.5" x .083" x 144" drawn (stronger) : https://dovertubular.com/aluminum-seamless-tubing-search/

Wing contruction.pdf

Laying in a 220V outlet in the garage is pretty easy, here are some videos: 

https://www.youtube.com/watch?v=X9ro7Tc2nFI

https://www.youtube.com/watch?v=u296hiXRzlE

Turbo,

It is great to have your aerodynamic expertise on this site - drop back from time to time and share, OK?

Rotax Rick is pretty reasonable, and his quality is great. He charges $1850 to $2200 for an overhaul of a 582