Good Afternoon everyone. I have a Yale forklift that won't start and would appreciate some advice. I'm sure this is a common problem but I'm not use to propane. It turns over, it will putter a bit if we step on the gas pedal, but it won't start. It backfires a bit. I squirt a bit of ether in it and it fires, but I wouldn't say starts. I get the feeling I have either no propane making it through the regulator (Impco Model J) or the timing is way off, but I think last time I checked that it was ok, it has been a while since I worked on it last. Possibly a valve could be bad also. If anyone has any ideas I would appreciate hearing them. The machine has 11633 hours and I have no idea on its history. Here is a video of it cranking over. Thanks in advance for any info you can give me.

http://www.youtube.com/watch?v=BqeCqfEkFPQ