Hello, I have a 2021 450 i I purchased from a local person about 6 months ago. When I went to look at it it cranked over slow but started. Owner said it was sitting for a couple months so battery was low. I drove it and all was good. It had 850 miles on it. I took it up to our mountain property and it always cranked slow but eventually would start. We put about 40 miles on it and 1 morning it wouldnt start at all. I ordered a aftermarket starter, and got a new battery. Put them both in and it cranked good for 1 revolution then stopped dead. I let it sit and tried it again it did the same thing. I took the plug wire off and no change. Removed spark plug and it spins right over. I could smell the starter smelled burnt so i got another 1. Put it on and it started and ran great. Next day it only would crank over 1 turn and stop again. I wondered if the battery didnt have enough amps so i put a solar charger on it over night. That worked for a couple days. Now nothing I do can i get it to crank more than 1 revolution. I even put a new 300 amp lawn mower battery in it and nothing. I hooked it up to my truck without it running and still wont crank. I have talked to dealers and none have a clue. They all want me to bring it in so they can scan it and trouble shoot it. That will cost me more than its worth. Anyone know if there in a compression relief in these things, or had the same problem? Thanks
