The owner financed with 10% down and carried the balance.

I plan to spend 2-4 months in each rehab to avoid any risk if the market changes.

I have a similar plan for my furnaces and hot water heaters with my local utility company...it's called risk control. 

How big of a risk am I taking. 100,000k is pretty much all of my business capital and this still is not 20% the banks want.

I have enough money for the down payment but I need help carrying the loan.

You take a risk which could result in cancellation of your title insurance and complete loss of your real property without compensation in the event that a title issue regarding your real property arises.Contact your title insurance company to determine coverage and if your policy does cover transfers , and when or how.2.

Otherwise aren't you at risk of a  potential cascade affect of mortgage foreclosures if several tenants cannot pay their rent.What is the recommended BRRRR strategy to full-proof your investments, regardless of the economy?

What other factors/items can I check to reduce risk in such a case ?

But I'll leave you with this -- somebody else's crappy risk management practices do not need to dictate yours. 

I am reading and am wondering if I can draw up all the numbers and possible risks, would someone be willing to engage in a partnership with me?