2005 250 Suzuki, broken

[Fjordrafting]

Here are some picks from our 250. It was new September 05, and had 100 hours when the piston wanted to get out of the powerhead.

[UKPOWERBOAT]

Originally Posted by Fjordrafting

Here are some picks from our 250. It was new September 05, and had 100 hours when the piston wanted to get out of the powerhead.

Blimey, and only after 100hrs!!, I posted a thread earlier trying to make a decision between a Suzuki Df250, Etec 250 and Yamaha F225, think that has just been made a little easier. 3rd/4th engine I have heard of now on the Suzuki DF250 going pop.

Really sorry to hear about this as certainly not good news for you. Good luck with getting it sorted

[joakimhansson]

when did it happen, in a jump or? Full speed?

[Petrov]

Martin, can you check how many over revs you have on the engine during this 100 hours?
Curious to know if it can have a connection, have seen a piston in bad shape (not as bad as yours) and probably it was because of over revs but not shure.

[fast fred]

that piston got hot, swelled up an started to stick, thats what bent and broke the rod, then the rod made some widows for ya.

[searafting.no]

I know of 3 others Suzuki 250 engines that have similar failurs and broke down in south of Norway, they have around 300-400 hours on them and are all on charter boats.

Im thinking the same, piston got to hot because of to little fuel injeted or one cylinder having not as much cooling as the others making the piston to hot.

[Petrov]

We are using high speed intake wich solved the problems with overheating, so one teori (on the enigne with same prob) is that they had pretty many overevs, many overevs means less cooling when you are air born many times during short periods, not a very good combination.

[fast fred]

the impeller usually gets smoked when ya start airatin it to long.

[Petrov]

Originally Posted by fast fred

the impeller usually gets smoked when ya start airatin it to long.

Usually

[searafting.no]

thats one teori , but i belive that also the suzukies have thermostats like the evinrude engines on the cooling water on the block, and i would guess that you would have a hot engine alarm if the main cooling on the engine was the problem. Im having problems thinking that 10 celcius over the normal (more than 10 degress celsius i guess you would have a hot engine alarm) operating temperatur would cause a piston to start swell.

One thing to think about is, are the blown pistons of the engines in the same region on all engies, my guess is that some cylinders are hoter than other and if you then have a combination of lean mixture air/fuel the temperatur inside the cylinder will be to high and making the piston start swell.


Having a exhaust temp probe on each cylinder would give you the data you need know under different conditions and load.