Hi was just wondering if using 20% MODEL TECHNICS nitro fuel will not harm my engine, safe to use? I have a GRP .12 tuning line, wondering if my current fuel will not harm my engine more than some 16%.
No it will not harm it. Just let one tank run like your breaking it in. Plus your going up in nitro % so add a shim onder the botton head and you should be fine you may have to make the hi speed needle a lil rich