With the help of an old Aermacchi friend I found the reason why the bike spit oil out of the exhaust. The fitting (oil inlet) on the cylinder was defective and over time 2- Stroke oil flooded the crankcase simply by beeing parked in the garage. The fitting has an integrated back pressure valve. I replaced the oil-line fitting and removed the excessive oil from the crankcase and from the exhaust and since then the bike runs good again after spreading the remaining oil everywhere in my driveway out of the exhaust.
Sven’s SX-175 (1974)
My standard test ride route to Cadolzburg
The finished SX-175
SX-175 Oldtimer evaluation…
Comparison
It’s alive again!
Almost there….
Ignition Switches
- After rewiring the whole motorcycle I had a strange problem and only had a spark with the ignition switch beeing in the “off” position. As soon as I turned the ignition switch to “ignition” or “ignition & light” I had no spark anymore. After some try & error and asking Michael from the UK for help I learend there is a different between switches for 1974 models and switches for 1975 and later models. To be more specific, I was always aware there is two different versions of the switch: One version with the pattern: “park – off – ignition – ignition/light” and one version with the pattern “off – ignition – ignition/light – park”. What I didn’t know: One version connects the pins 6-7 when “off”, while the other version disconnects the pins “6-7” when beeing in the off position. All other functions are the exact same between the switches. Thankfully Bram & Jenny from Luxembourg helped me out with the correct ignition switch! Thank you!
- On the first picture you can see a 1973/74 version and a 1975 & later version of the ignition switches
- On the second picture you can see my brand new wiring harness connected to the ignition switch.