05 155 wake

[ericcs]

i have just purchased a 155 wake with 85hrs.
i had it serviced for peace of mind, and today took it for it's maiden voyage, only to have it drop a cylinder after 20 mins.
the shop threw in another new plug and loaned me a second hand stick which seems to have fixed it(fingers crossed)
i'm dismissing the speedo readout, as i'm sure it was going much faster than it showed, but it only rev's out to 6700rpm 1 up.
i realize it may not have the original impellor, but should it rev higher?. if so, what can be done to fix it.
also, is it possible to check the impellor pitch without removing it?
thanks for anyones help!
eric

 

[Coastiejoe]

An incorrect impeller can easily affect max RPMs. If the pitch is to big, you will have lower RPMs but increase max speed as long as the engine has the power to over take the load. In most cases, a minimal change in impeller had a minimal change in RPMs as our engines are pretty strong (when running correctly).

Unplug the rectifier and see if that helps. Keep in mind you will not be charging your battery, but it is an easy test and it's a free test.


Repairing and selling iPads, iPhones and Mini iPads.

 

[ericcs]

what does unplugging the rectifier do, and do you know what rpm's i should get?

with the impellor, is it like an outboard, where the engine must be propped so it's able to reach it's max rpm?

 

[Coastiejoe]

Unplugging the rectifier determines if the rectifier is the issue. When they start to fail they send A/C volts to the system which normally results in a loss if engine performance.

Yes, impellers and props follow the same theory in regards to working load and what not. To much bite will result in lower RPMs and decrease speed unless the engine has been modified to tackle the additional load.

That said, like a boat you can go a little each way to gain either low end or top end performance and the engine can handle the subtle difference with no issues.

Extremes in either direction normally require engine mods.

 

[ericcs]

thanks coastiejoe, i'll try find and dissconnect the rectifier this weekend. if it's ok, i'll take the impellor out and check it's size.
i've been told it should rev closer to 7300 rpm?

 

[ericcs]

looking thru the grate, i think i may have a solas impeller, as the leading edge has a curve in it, and it has a green seal in front. is this correct?, if so, are there any markings visible to determine it's pitch, as i can't see any thru the front or back. just maybe the pitch is too big, hence why only reaching 6700rpm!

 

[KK40384]

looking thru the grate, i think i may have a solas impeller, as the leading edge has a curve in it, and it has a green seal in front. is this correct?, if so, are there any markings visible to determine it's pitch, as i can't see any thru the front or back. just maybe the pitch is too big, hence why only reaching 6700rpm!

Solas usually have the pitch marked somewhere on the impeller. You may have to pull the pump though to see it. It's quite easy to do. If you need any help I have a video posted somewhere in how to remove it and re install the pump. If you can't find it I'll send you the link.

 

[ericcs]

thanks kk, will have a better look. would be great if you can find the link

 

[KK40384]

[youtube]vTFTlE4GyrA[/youtube]

[youtube]QMvmoM1HFAw[/youtube]

 

[purple_people_eater]

my wake tops out 6850-6870

 

[ericcs]

my wake tops out 6850-6870

ok thanks, not too far off then. i cant find anywhere in nthe service manual what the max revs are, only that the limiter is set to 7650rpm

 

[ericcs]

thanks for the video's, quick and precise, unlike some on the net