TransAlp Main Jetts
 

A few months back I was having serious problems with my 87 TransAlp at high altitude (10.000 to 17.000 feet) in Chile and Bolivia. The manual listed stock 120 main jets and when I opened up the carburettors these had been replaced with 130’s, which explains why I was having problems when other TA riders weren’t, at least not under 10,000ft anyway. In the end I replaced these with 100s, simply because they were all I could get my hands on (we re-machined some Volkswagen jets to fit). This solved the problem and the bike ran absolutly great the rest of my time in the Andes, about 4 months.

I was advised by JD Jetting in the US to make a 10-12% reduction (so down around 108 to 105). Right now I’m just below 8,000 ft. and still running great, but I will be heading back along the coastal highway at sea level and I’m worried that I may need to switch them back to avoid any damage.

Has anyone had any experience with running 100 main's at sea Level? Can I get away with running them or should I take the time off and make the switch back.

Thanks for any insight and advice