OK this is my opinion and only my opinion, I think you're running it enough and frequently enough to not need stabilizer in it, it's not sitting idle for 6-8 months at a time. I only stabilize if it's going to sit for the winter in storage for 5-6 months. If your MH engine is running fine then I would make the assumption that the fuel to the generator is okay. I forgot if you said you have been priming the generator before you attempt to start it but if you're not that could be why its hard starting. I have to go back over your original question.
__________________
|