Increasing WOT RPM

[Splash]

D-A-V-E.

Astounding!

The guys here have the best advice!

From my own expereience, you will notice a huge diff in performance after recs have been implemented.

Good luck mate!

SPlash

[Fed]

After a lot of squinting at the pics I'm not convinced the motor height is out by more than the available adjustment at all.
You need to trim in until the prop shaft/cavitation plate is parallel to the bottom of the hull then take some measurements and some clearer pictures.
Also compare your measurements to the available adjustments on the existing holes.

[Noelm]

I think the one very important fact we are over looking here is, "was it ever capable of more than 4,000RPM"? if not then before any fiddling about with the Motor is done we need to at the very minimum get another prop (borrow maybe) to test it out, as well as checking Motor height, fooling about with setttings and stuff MAY introduce a problem that was not there before, if you get what I mean!

Remember when I said this way way back? well this is the reason why, ALWAYS check the very obvious first!

[146C]

Have decided to remove spacer and replace gearbox with one that suits a 20in transom. It is also cheaper than building up the transom and less restricting when the time comes to repower.

I have removed all but one stud used for holding the spacer to the shaft housing.
The problem seems to be the stud is sticking inside the spacer.
The stud moves easily within the shaft housing when spacer is turned along with it, problem is that the water tube prevents the spacer from turning completely. I have managed to unbolt the stud about three millimeters with a huge amount of effort but now wont budge. Have tried heating it a few times but still no success.

Can anybody offer any other suggestions to remove the stud without stripping back the motor to remove the water tube?

I hope to pick up the replacement gearbox Friday.

Thanks to those who have previously offered their advice it has been greatly appreciated.

Cheers,

Dave.

[SunnyCoastMark]

WE might need to see photo's of the offending stud

Mark

[FNQCairns]

Hey Dave have you checked out what is the deal is with the shift shaft? Some engines need to have the powerhead removed to replace this, dunno about yours.

Possibly lots of white corrosion inside the stud tube through spacer.

cheers fnq

[BM]

FNQ, in a 20 to 25 conversion the shift shaft usually has an extension piece that fits onto the existing spline with a new spline at the bottom since its a no load linkage.

I fail to see however, that an alloy plate to raise the engine could be dearer than converting his current box back to long shaft or replacing it with another box to suit a long shaft application. Unless the replacement box came for $100??

Dave, heat, penetrating lubricant, scratching device and a mallet will get it apart. I had similar recently with a pair of XL Yammies on a cat and both extension housings were jammed on by salt.

Gotta love Jap engines mate, fantastic when they are new but don't try pulling them apart when they have a few years on them coz they are the worst of the bunch....

Cheers

[Roughasguts]

Dave you tried tightening then loosening the stud, keep going back and forward, use plenty of lube mainly to wash the thread out and she should come out.

[FNQCairns]

FNQ, in a 20 to 25 conversion the shift shaft usually has an extension piece that fits onto the existing spline with a new spline at the bottom since its a no load linkage.

I fail to see however, that an alloy plate to raise the engine could be dearer than converting his current box back to long shaft or replacing it with another box to suit a long shaft application. Unless the replacement box came for $100??

Dave, heat, penetrating lubricant, scratching device and a mallet will get it apart. I had similar recently with a pair of XL Yammies on a cat and both extension housings were jammed on by salt.

Gotta love Jap engines mate, fantastic when they are new but don't try pulling them apart when they have a few years on them coz they are the worst of the bunch....

Cheers

Yeah BM but if it is a factory 25 then the shaft may be one piece like my bloody Yam, last thing Dave needs to do is pull a powerhead when a plate like you say or even a simple bracket will do the job. Hope Suzuki did do the extension thing in the factory.

I ended up grinding the yam spacer into tiny little bits to get it off, brain surgery style .

cheers fnq

[BM]

But there is a spacer plate in there so it has to have been converted. I don't know any engines that came from the factory as a converted 20 inch with a spacer plate and 25 inch shift shaft as a solid unit.

Not saying it hasn't happened but the very presence of the spacer plate suggests not.

But you never know. It is a Suzuki we are talking about..........

[146C]

Hey Dave have you checked out what is the deal is with the shift shaft? Some engines need to have the powerhead removed to replace this, dunno about yours.

Possibly lots of white corrosion inside the stud tube through spacer.

cheers fnq

The manuals say installation is the reverse of removal making the clutch shaft one of the very last things to be reconnected.

Dave

[FNQCairns]

Yeah dunno on the Zuk, although they are almost a design copy of the Yam 3cyl or vice versa but the Yam came with spacers from the factory for the 25 inch models dunno about all of the HP sizes though.

cheers fnq

[BM]

I believe Zuk definitely copied Yam. Yam was around from the early 70's but marketed under the name of Mariner and distributed by Mercury.

Come to think of it, the Suzuki engines were not too far behind the Mariner (Yams) maybe only by about 3 yrs.

Cheers

[146C]

But there is a spacer plate in there so it has to have been converted. I don't know any engines that came from the factory as a converted 20 inch with a spacer plate and 25 inch shift shaft as a solid unit.

Not saying it hasn't happened but the very presence of the spacer plate suggests not.

But you never know. It is a Suzuki we are talking about..........

Hi BM the service manual I have lists both 20in(L) and 25(UL) with a 5kg difference in weight. However I have so far found no reference of the spacer in the manual.

The clutch shaft is also one piece. This took me a while to work out because the manual said remove the cover in front of he clutch rod connector pin my motor does not have this so had to disconect it from near the powerhead.

Cheers,

Dave

[BM]

Spacer plates dont usually show up under normal parts listings. I just checked a site that is good for Suzi parts and could not find it. They normally come under accesory items or something similarly obscure.

There is definitely a spacer fitted to your engine.

The figures quoted would be right also. Most spacer kits add approx 5kg to the weight of the engine.

You probably need to speak to a Suzuki dealer of old as many "new breed" Suxi dealers will simply not want to know about what they perceive to be "old stuff".

Try Leisure Sports Marine here in Vic (Dromana/Safety Beach area). They are a Suzi dealer of old and have many parts in stock. They will be able to answer your questions.

Cheer
Cheers