Has anyone tore down a 4hp flat head? Its very odd compared to its larger and smaller relatives. Does anyone know more about these? They seem to be built very well
Yes it's funny how they retool and redesign things .
When they could alter the intervals and change the power and size .
The external size would stay the same , which is one reason . The bean counters also have a say , more material that's uneeded . A new hot shot engineer with a better idea . And of course manufacturing techniques change .
Absolutely. Oddly it has a significantly larger bore that 5hp about half the stroke and valves the size of the 3 hp. Same crank case cover as 3hp and its own head design. External appearance resembles the old 5hp cool bore engine. I'm hoping its gonna be a good match for the mini bike I have because the 5 hp is gonna be too tall and despite the no quit performance of the 3 hp, literally couldn't ask for more out of the bone stock one i have right now. I feel like I could a little to a lot more MPHF than it has to offer. Again very impressed with what the 3 hp brings to the table. I just hope the 4 and 5 hp flatties are as impressive. #thelittleenginethatcould_