More power!!

[joetheweed]

Guys ive heard talk of 25hp and 30hp engines being exactly the same, but with minor differences on the 25hp to reduce power.
is this true? is it easy to make the 25 have the full 30 horses?
oh and do the extra 5 horses weigh much??
thanks,
Joe

[crazymac680]

There are some engines that have the same block as a greater powered engine. It's usually the carbs that are different and I wouldn't expect them to way more. Dont think it's really worth doing unless you have the greater powered engine lying around with a knackered block.
Dan

[9D280]

Depends on the engine. It can vary from a simple restrictor plate to a replacing half the engine.

Some also limit the spark advance on the 25, and as you generally can't reprogramme the CDIs that becomes a chuffing expensive component swap.

Also check the brochures of your engine (I assume the Mariner). Not all manufacturers twinned those two on the same block!

Have a search here - there's a few posts about this game.....