RE: MVVS .91
Rajiv (?),
I recommend the break-in be performed with a 12.5x8, or a 13x8 prop, for a low load.
Please follow the procedure described in [link=http://www.rcuniverse.com/forum/Tapered%2DBore_Engine_Break%2Din_%2D_Upgraded/m_1850473/tm.htm]this thread[/link].
I am quite sure 25% castor oil will not be a problem in India, but do select only high-quality, first pressing product, so your engine will not become gummed up.