This is the XR100R from a previous long post. I've tried every thing to do with gas, new air filter, new gas, cleaned carb twice, new airscrew and washer, cleaned out with strong comp. air 150 psi, all back together and no dif. tried checking the coil but I can't get it off the bike. the previous owner felt the need to tighten screws with some type of air gun. I can't get it to budge and its starting to strip. I tried getting an ohm reading with it on the bike but I'm not sure how accurate it is. it seems low on the secondary lead, but can't be sure because i can't get it off the bike.
Further help is appreciated.