lots of my friends run zens,i have run them.i have even had one of daves zen7.ran them all mate.zens will not pull a 482 prop.sikk will standard,i run a 482 on my apachee 56",and the only zen that i have seen so far that is faster than my sikk is daves boat in his sigma,i race with people running zens martin,and i dont have a problem passing them at all,trying to finnish a race on the other hand is another story,i must learn that its not always about all out speed,upside down boats dont win races if you know what i mean,i understand that you are only going on about what you read,and some people may have the odd problem.but i have not.so on that basis i can only say what i know.i have been into boats now for 26 years and racing 1/5 th cars for at least 14 years and have tryed every small 2 stroke known to man and modded most of them.the zen is a bloody good engine but £ for £ you get better power and value for money with a sikk 27.now that they are £185,thats £145 cheaper than daves zen 7 and still able to pull a 482 prop.put a 482 prop on a zen and see what happens martin,i know what happens as i have tryed.i still have a boat with a zen in but it has a mhz conversion on it,runs sweet,i just like what the sikk gives you for your money,dont knock something untill you have seen one or tryed on,come to sale on sunday and have a look mate,there will be a few sikk engine boats running there and you can bring you weedwacker down and have a laugh with the rest of us kids,i leave it up to you the offer is there if you are interested ,i would just like for you to see some of these boats run,we are a friedly bunch.,,,,,,,,,,,,,kurt