Need your help for heavy engine rebuild
Hi everyone, as my very first motorcycle I bought a KLR 650 in Fresno, September 2017, was 9k miles. I rode Mexico and after 2.5 months at 15k miles I had to replace the piston. The mechanic I saw in Tuxtla Gutiérrez (Chiapas, South Mexico) just put the new piston with the former cilinder which was looking good, despite I insisted to measure it he said it was not necessary. In addition he told me to run it gently for 200ish km but not more...
I reached Colombia in June 2018, the bike started to burn 1 liter oil per 1.000 km. Engine was starting to do a rattling noise but I postponed the job. By the end of June 2018 I entrusted the bike to people I know in Ipiales, South of Colombia, as I had to come back to France. I asked them to run it so the engine would stay in good state.
11 months later, May 2019, 2 weeks ago I'm back to Colombia, the engine still makes the rattling noise. I change oil and filter and ride about 5 hours from Ipiales to the North.
The Engine died, I put it in a truck to reach Cali and meet a recommended mechanic.
We opened the whole engine, the piston and cilinder are worn, the crankshaft flywheel and rod are stuck. We suspect lubrication failure but oil was full and new and the oil pump seems to be working.
I can not afford brand new parts as it's ridiculously more expensive than the bike itself, so the mechanic in Cali gives me two different options :
Put a new 685cc piston in my cilinder with bigger bore and honed, plus installing a second hand crankshaft flywheel and rod in good state.
Put a second hand 650 piston and cilinder in good state, plus installing a second hand crankshaft flywheel and rod in good state.
The second hand parts would be shipped from Cúcuta where they have a lot of KLR parts from Venezuelan Police using KLRs. Basically I have no way to inspect them before delivery.
I'm privileging option A, the mechanic sent me the pictures of the 685 piston he has here in Cali.
Do you reckon the figures on the sticker are correct?
Is it normal that it comes in a box branded JE and the sticker is branded Schnitz Racing?