M700

[AutoScott]

I have a 1975 M700 with a VH4D Wisconsin. The sticker on the inside says "Regular Gasoline". Is it ok to run unleaded gas or do I need to use leaded gas additive? Also, what are the rear hyd couplings that are welded to the engine door normally used for?

 

[flyerdan]

According to the service manual, it requires 90-94 octane and specifically says not to use unleaded fuel. These were made in a time when real gasoline abounded, and lead was used to protect the valves from burning. My Harley FLH from the same era is similar, a lot of people just do a valve job with modern components that does away with the lead requirement. As for the rear hydraulic couplers, the only item that comes to mind are rear stabilizers for a backhoe attachment, but hopefully somoene else will chime in with more options.

 

[6brnorma]

The additive is nice but in all honesty, I run a number of VH4D thousands of hours annually with unleaded with no problems. I'll be interested in what others have to say on this subject. The couplings are for accessories.