Originally Posted by
Flx
Hi,
I am the guy with the boosted honda 50hp
Yes the camshaft made a hudge difference in the high rpm, i now keep getting the rev limiter at 6600rpm with 4 blade cleaver 10.5x18,
The engine is tweaked on the ignition by at least 3 degree of advance. This also make a hudge difference, let just say it is not a quiet honda anymore. Once you twist the gas, there just no lag, it will spin to the top.
Ive since bought a brand new boat, my next bet is a yamaha 70hp, these engine with a simple ecm reflash can gain 15hp, it would be even more with porting, camshaft and more compression.
The major problem i had with the honda is oil ingestion by the pcv tube at high rpm. It could be easy fixed with a catch can.
If you balance the engine i think it could run easy over 8k rpm. With headwork also !
Lundin marine can reflash any 4stroke and is located in norway. He is a king pin.
JBmecanical is located in australia. That guy live tune outboard.