[Bigshrimpin]

Originally Posted by Bushwacker

I believe they are also "throw away" motors, i.e., the way they got the weight down was to eliminate the cast iron sleeves and coat the aluminum block. That works ok, as Porsche, BMW and Mercury have been doing it for years. However if you get into a fuel starvation situation (air leak or fuel line/injector restriction, etc.) that leans out a cylinder that overheats a piston and scuffs cylinder, it's probably non-repairable, i.e. you can't just bore/hone and replace piston as you would if there was a cylinder liner. All you have to do is replace the powerhead!

Considering the cost of these new motors, giving up repairability to save a few pounds IMHO doesn't sound like a good tradeoff from a risk/benefit standpoint! If your application is a 20 that was designed for a ~300 lb motor, it'll ride and handle better with a lighter DI 2-stroke or a smaller and lighter 4-S.

unless you put a window in the block uschrome can fix them.