Forums > Sailing General

De-rate 6hp outboard to 5 or 4 hp

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Created by kimtrang > 9 months ago, 2 Oct 2017
kimtrang
55 posts
2 Oct 2017 4:30PM
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i have a 2014 6hp 4 stroke Tomatsu outboard. The 4hp, 5 hp and 6hp have the same block. What would be involved in de-rating it, so I do don't have to get my dinghy registered?

Agent nods
622 posts
2 Oct 2017 5:02PM
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change the 6 on the cowling to a 4 ?

rumblefish
TAS, 824 posts
2 Oct 2017 10:03PM
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As far as i know it's simply done by governing revs

LooseChange
NSW, 2140 posts
3 Oct 2017 10:47AM
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Restrictor plate in the inlet side is commonly used to re-rate engines.

HG02
VIC, 5814 posts
3 Oct 2017 10:55AM
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Have you run out of rough red Loose change

Ramona
NSW, 7744 posts
3 Oct 2017 6:02PM
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kimtrang said..
i have a 2014 6hp 4 stroke Tomatsu outboard. The 4hp, 5 hp and 6hp have the same block. What would be involved in de-rating it, so I do don't have to get my dinghy registered?


Change the engine cover decals!

With the two stroke Tohatsu's the difference between the 2.5 and 3.5 is the carburetor jets. The manufacturers tag with the numbers would give the game away!

kimtrang
55 posts
4 Oct 2017 4:03PM
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Will I go to jail if caught by Waterways having changed the number? I don't want to go to jail.

Trek
NSW, 1197 posts
4 Oct 2017 9:24PM
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Put a self tapper in the throttle control so you can only wind it up to 75% power. Its such a stupid law it needs a stupid solution. I think that would do the trick.

Kankama
NSW, 793 posts
4 Oct 2017 9:47PM
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What is the law? It used to be that any boat over 8 knots needed to be registered. You won't go to jail - the worst you will get is a fine.

Sectorsteve
QLD, 2195 posts
4 Oct 2017 8:57PM
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If in qld the law is different. They seem to have their own rules here. For many things. Anything over 6hp you need a licence for. Cops were zipping around on keppel and humpy checking everyone. Very very average.

cisco
QLD, 12364 posts
4 Oct 2017 11:44PM
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Yes Steve, the laws are slightly different in each state as they are in differnt countries.

Is that some reason to criticise anywhere that is different to NSW??

Compliance is what the Boating and Fisheries Patrol Officers are paid to enforce. That enforcement maintains standards that I am sure 99.99% of the boating and general public want maintained.

These standards are what allow you to do what you are now doing.

Rafferty's rules went out the door long ago.

Yes it is very, very average. It is so average that it is what happens in every state and territory of Australia.

Suck it up or suffer the penalties.

slammin
QLD, 998 posts
5 Oct 2017 5:36AM
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Strictly speaking there is a kW limit not hp. It's 4.5kw so if by whatever means you can show that your outboard is 4.5kw you'd be good to go.

Sectorsteve
QLD, 2195 posts
5 Oct 2017 7:02AM
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cisco said..
Yes Steve, the laws are slightly different in each state as they are in differnt countries.

Is that some reason to criticise anywhere that is different to NSW??

Compliance is what the Boating and Fisheries Patrol Officers are paid to enforce. That enforcement maintains standards that I am sure 99.99% of the boating and general public want maintained.

These standards are what allow you to do what you are now doing.

Rafferty's rules went out the door long ago.

Yes it is very, very average. It is so average that it is what happens in every state and territory of Australia.

Suck it up or suffer the penalties.


Ive got a license. Qld is corrupt as **** as far as im concerned. Period.

Yara
NSW, 1315 posts
5 Oct 2017 11:33AM
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Sectorsteve said..
If in qld the law is different. They seem to have their own rules here. For many things. Anything over 6hp you need a licence for. Cops were zipping around on keppel and humpy checking everyone. Very very average.


What's "humpy checking"?

PhoenixStar
QLD, 477 posts
5 Oct 2017 12:28PM
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slammin said..
Strictly speaking there is a kW limit not hp. It's 4.5kw so if by whatever means you can show that your outboard is 4.5kw you'd be good to go.


I think you will find that Qld. is 3 kw, which is a little more than 4 hp. So 4 hp is ok, gets in under the registration rules.

jbshack
WA, 6913 posts
5 Oct 2017 10:45AM
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I have been told that Water police and DPI have been in training to look out for outboards under rated.

Also in WA a vessel used as a tender does not have to be registered. HOWEVER a tender is used to get to and from the shore only so technically if you go from one boat to another boat, you can get done..

slammin
QLD, 998 posts
5 Oct 2017 5:47PM
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PhoenixStar said..


slammin said..
Strictly speaking there is a kW limit not hp. It's 4.5kw so if by whatever means you can show that your outboard is 4.5kw you'd be good to go.




I think you will find that Qld. is 3 kw, which is a little more than 4 hp. So 4 hp is ok, gets in under the registration rules.







Cheers Phoenix, just double checked my memory, yay it worked ok.

"Boat and personal watercraft licences You must have a marine licence to operate a boat that has an engine power greater than 4.5kW. You don't need to carry your licence with you on the water, but you must have proof of identity with you. " from QLD Transport.

Quick bit of googling...



4.5 kilowatts = 6.0345994 horsepower

Next question I don't think Kim ever said what state?

Bananabender
QLD, 1610 posts
5 Oct 2017 7:25PM
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Think you are mixing apples and oranges Slamming.
For Queensland you must have a boat licence to operate if motor is over
4.5 kilowatts.
For Queensland you must register your boat if motor Is over 3 Kilowatts

So you can operate a boat without a boat licence if motor is less than 4.5 kilowatts but you must register the boat if the motor is over 3 likowatts.

kimtrang
55 posts
6 Oct 2017 2:05AM
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Kankama said..
What is the law? It used to be that any boat over 8 knots needed to be registered. You won't go to jail - the worst you will get is a fine.


Just joking about going to jail- over the motor. They might get me on outstanding warrants- just joking.

I'm in NSW. I think that 5hp and under- no rego required. Under 10 knots- no licence required, but I don't know if that means actual speed or capability.

LooseChange
NSW, 2140 posts
6 Oct 2017 10:31AM
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kimtrang said..

I'm in NSW. I think that 5hp and under- no rego required. Under 10 knots- no licence required, but I don't know if that means actual speed or capability.


NSW Roads & Maritime:......
Licence
The speed at which a boat is driven determines whether you need a licence. Anyone who is the operator of a power-driven vessel operating recreationally on NSW waters, at a speed of 10 knots (approximately 18.5km/h) or more must have a general boat driving licence. Anyone who drives a personal watercraft (PWC) at any speed must have a PWC driving licence.



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"De-rate 6hp outboard to 5 or 4 hp" started by kimtrang