I find the primer perfectly adequate as long as you know there is fuel all the way up to the carb. I had a devil of a time starting my 582 sometimes, especially re-start, and since I installed a 2 to 4 psi firewall boost pump with my 670, not a single problem. The pump assures that the fuel lines and carb bowl are full, something the slight gravity pressure doesn't seem to assure.
The post above yours shows all weights to 1/2 a lb! Maybe your browser doesn't open the pictures. Here is what it says: Header 7 lb, muffler 6 lb, motor mount 6.5, oil tank coolant tank and radiator 8 lb, electrics hoses nuts and bolts 5 lb, Apex engine, throttle bodies and Skytrax gearbox 144 lb, airbox and filters 2 lb, total 178.5 lb
I used Rotax Rick, and swapped my 582 for the zero time 670. He recommended Mike Hair in Utah to do the pipes, Mike took my 582 muffler and modified it, making a perfect fit. He was not expensive at all. Here is the finished product:
Mark, I find Chinese eBay listings to be very deceptive. A few weeks ago a Chinese heater on eBay was the subject of a thread, and the listing deceptively claimed 4 times the actual heat capability, the watts it claimed were accurate, the BTUs were fictitious. And this listing says 5-24V sensor, not telling you the system needs 120-240V AC, except the fine print at the bottom, a long way from the deceptive headline.
Clearly they use capacitance to detect the liquid level. Drawback: The units shown use 120V as their primary input power. The lying chinese company thinks we can't read their data plate. The SENSOR is 5V, but the processing box has 120V input requirement. Jim Wiebe of Belite sells a nice one for our use, check out: http://www.beliteaircraftstore.com/bingo-3-liquid-detector/
Anders, I installed a new 670 about a year ago, and documented the results in a separate thread. Overall, it has been excellent. The install was a drop-in to the 582 mount. The exhaust fit perfectly, I had to cut the bottom of the cowl about 3" to accommodate the new exhaust muffler. Power is as advertised, starts and runs great, the weight increase is about 10-15 lbs, and that includes the new 3 bladed Warp Drive prop and the belly radiator (needed due to the extra power/heat of the 670). My new weight with new wide bush gear, new prop, new belly radiator and the 670 is a total of 19.5 lbs more than my 582. I operate at over 6000 feet takeoff, and typical DA runs 9000 so I see the power of a sea-level 582 here at 9000 feet. Here is the entire thread, discussing install, performance and weights: http://www.avidfoxflyers.com/index.php?/topic/5734-new-rotax-670-install/&page=1
Those temps are pretty low, Anders. What is your ambient? My 582 would overheat (with 2 nose radiators in my D model) in climb at any ambient above about 60 degrees F, and would overheat wildly in cruise if I installed the heater cone on one radiator.
Here is the best source, the Rotax Installation Manual. see Chap 18 for the schematics and wire colors. All pretty simple. Page 18-2 has the exact color list. https://www.cps-parts.com/cps/pdf/d00287.pdf
Simple answer: The key switch grounds the "mags" and prevents spark. The gray ("silver") wire is for the tach only (use a tiny tach, the regular analog tach is a POS).