Engine upsizing question

[CookMySock]

What is the situation if I buy a currently-registered and road-legal 250cc bike, and slap a 500cc engine in it? Obviously I will have to update the particulars with regard to the vehicle, but is there any recertification required, or any other hassles?

Add to that, adding larger brakes and different wheels and so on. Are there massive hoops to jump through with these sorts of modifications?


Many thanks,
Steve

[The Pastor]

nup no need to get it certified at all. just do it and give the cops the finger.

[hayd3n]

What is the situation if I buy a currently-registered and road-legal 250cc bike, and slap a 500cc engine in it? Obviously I will have to update the particulars with regard to the vehicle, but is there any recertification required, or any other hassles?

Add to that, adding larger brakes and different wheels and so on. Are there massive hoops to jump through with these sorts of modifications?


Many thanks,
Steve

you can try but it probably wont pass a wof

[george formby]

Unless things have changed, I remember CBR600 rolling chasis with 900cc fireblade motors rego'd & warranted as 600's. I guess it would come down to the usual thing, if nobody notices, nobody cares. Not sure what the repercussions would be if you were found out though. Fraudulent use of a bigger engine or maybe ACC levy fraud, hmmmm. Ok, $100 fine & a stern telling off.

[CookMySock]

Unless things have changed, I remember CBR600 rolling chasis with 900cc fireblade motors rego'd & warranted as 600's.

Nah I wanted to keep it square and legal.

What can I get away with, and what needs to be certed and how?

Steve

[PeeJay]

What is the situation if I buy a currently-registered and road-legal 250cc bike, and slap a 500cc engine in it? Obviously I will have to update the particulars with regard to the vehicle, but is there any recertification required, or any other hassles?

Add to that, adding larger brakes and different wheels and so on. Are there massive hoops to jump through with these sorts of modifications?


Many thanks,
Steve

If you are a good little kiwi and dont wish to upset good order and disipline then by all means update the details, then you will be doing the recertification thing, engineers reports etc, etc, etc, and $$$$$$$$.
If you "believe" the replacement engine is exactly the same as the original you can try to use a MR16 to change the engine numbers in the rego details. Not sure who reads these, could be a smartarse who actually knows enough to send you a letter.
On the other hand you could just do it. The only official to look at it will be a wof guy, and if he asks, plead ignorant and say it has always been like that. You could even make sure the engine numbers match whats on the original rego details to prove it.
Of course I have no direct knowledge of this working, just something I heard on the internet.
If I ever feel I should kowtow/pay money to officialdom any more than necessary than I daresay I will update the details for a couple of my vehicles. I am sure there is a CEO of a government dept who needs a payrise in these tough times so we should all be doing our bit to keep their spirits/bank balances up.

[meowmix]

I don't have any actual evidence sorry, but for cars etc. that does require a re-cert, I would assume it is the same case with bikes.
The easiest way to do it would be to ring up the local certifier and ask them.

[CookMySock]

I don't have any actual evidence sorry, but for cars etc. that does require a re-cert, I would assume it is the same case with bikes.

Yeah. I changed a seat in a van once, and ka-ching thats 400 bux thx mate.

The easiest way to do it would be to ring up the local certifier and ask them.

I guess. Traditionally I don't do that, coz I get their long detailed drawn-out method, rather than the simple way.

Someone on KB will have done it and got it legal. Maybe a trip down to the VTNZ office will pay dividends.

Steve

[PeeJay]

Nah I wanted to keep it square and legal.

What can I get away with, and what needs to be certed and how?

Steve

Any brake mods, a different engine, will need to be inspected by a Low Volume Vehicle inspector.$$$ This will lead to an engineers report to show your 250cc frame can handle 500cc of power. That the brakes are compatible, the bigger wheels arent going to upset the handling etc etc etc more $$$ Back to the LVV inspector to think about it.
As soon as you tell them anything there will be nothing to get away with. Once the process starts it cant be stopped apart from not doing anything at all.
Here are the people to talk to. http://www.lvvta.org.nz/
It isnt that bad but depending on what you are doing it can turn into a mission and cost time and money.

[CookMySock]

great. Oh well.

thanks anyway.
Steve

[PeeJay]

great. Oh well.

thanks anyway.
Steve

Dont let the Man keep you down
In the words Of NZ's preeminent contemporary filosifiser

Hey Doooug Jus do eet...... Leeev a leetle

[imdying]

Any brake mods, a different engine, will need to be inspected by a Low Volume Vehicle inspector.$$$ This will lead to an engineers report to show your 250cc frame can handle 500cc of power. That the brakes are compatible, the bigger wheels arent going to upset the handling etc etc etc more $$$ Back to the LVV inspector to think about it.
As soon as you tell them anything there will be nothing to get away with. Once the process starts it cant be stopped apart from not doing anything at all.
Here are the people to talk to. http://www.lvvta.org.nz/
It isnt that bad but depending on what you are doing it can turn into a mission and cost time and money.

great. Oh well.

His post is correct, and as he says, it's not as bad as it sounds. The braking tests etc are fairly rudimentary, you should have no trouble. They don't charge an arm and a leg, and they don't charge extra based on the number of modifications.

[vifferman]

Huh.
Never even thought about this stuff when I had the Mutant XBR500RS. It was rego'd when I acquired it, so I just tidied it up, put it back on the road.

[CookMySock]

His post is correct, and as he says, it's not as bad as it sounds. The braking tests etc are fairly rudimentary, you should have no trouble. They don't charge an arm and a leg, and they don't charge extra based on the number of modifications.

okies. If its just 400 bux then maybe I should just do it.

Huh.
Never even thought about this stuff when I had the Mutant XBR500RS. It was rego'd when I acquired it, so I just tidied it up, put it back on the road.

Well maybe I'm overthinking it. This is why I'd start with a bike with current rego and wof. God help anyone who hacked something up from scratch and took it to be VINned.

Steve

[imdying]

Have a word with a low volume vehicle certifier, should be able to get a list from the LTNZ website. Generally they're older experienced mechanics who've been in the system since the Hot Rod Declaration days. The ones I have encountered are fair and reasonable, and passionate about modified vehicles, so it's not like they're going out of there way to fail you. There are odd things you will find that need doing, things like using the correct type of hose clips for fuel lines etc, but definitely nothing you can't handle if you're able to get the motor mounted in the first place!

IIRC it's about $400, which gets you your certification and a new VIN number, but you'll also need to pay for a WOF, and a minimum of 3 months registration to accompany the new plate you'll be issued.

Once that is done, it's a completely legitimate vehicle

/edit: My own thoughts are that if a vehicle can't pass the mechanical portions of the VIN compliance tests, then it's not suitable for road use in any case, they're not particularly stringent.