Hello all. I just had a mate tell me that because I took my 883 to a 1200 I now need an engineers certificate to make everything legal as far as rego goes. Any comments appreciated.

Tell your mate , it is only a 74cid, that will confuse him!

In Victoria if it's an optioned as 883 & 1200 same bike you only need a rwc. From looking at it how can you it's not a 883.

not hard to do capacity check. they do it on race bikes & cars & have done for years. 

I had a yammy RD250lc as a young fella. (don't know if anyone remembers them) Everyone was fitting the 350lc heads and cylinders. I never did it cause I thought the authorities could easily tell. Before I got thinking about it too much, a friend rode it into the side of a car and nearly killed himself. 

The equation for finding the engine displacement of a motorcyle engine is: ((bore multiplied by bore, multiplied by stroke, multiplied by PI), divided by the number of cylinders in the engine), divided by 1000.   The bore is 95.3 mm (3.75 in) and the stroke is 101.6 mm (4.00 in), meaning the displacement is 88 cu in (1,450 cc). The Twin Cam 96 displaces 96.7 cu in (1,584 cc).

Lol . This is hilarious. No one will find out . 

Just enjoy smoking people who think you are on a 883 lol

Just tell them it's been rebored.

yeah...tell him hes talkig chit!  (he is worried that you will blow his 110 out of the water; which a 1200 will do)

I have never heard of anyone ever being asked about this, let alone being booked for it!

Only issue I can think of would be you prang your 883 and a clever insurance investigator finds out its got a 1200 top end and they refuse to pay out on your claim. 

^^^^^
Eggs Ackerly.
Reckon the investigator will be looking more for faults in the operator . Like what is in your blood etc.

If a bikes already been binned you don't need to be delicate it pulling things apart to inspect. There are other ways of finding out too. For starters they can inquire with shops that do the work, review ebay or forum purchases etc 

I've done two 883/1200 conversions and I didn't bother updating the rego on either one.  Having said that, mine were less conspicuous, there was not way you could tell from the outside, as I used the 883 heads and the upgraded barrels were not marked.  It might be a different story if you have heads and cylinders marked with something that could be identified like "Screamin Eagle".  That would be an easy giveaway.

Well.........I set off a bit of a discussion. My friend who raised the topic with me was concerned as the rta had told him that once engine capacity had been increased by over 20 percent from original an engineers certificate was required by law. The same friend had a bad accident in his ute, his fault, and both himself and the person in the second car were hospitalised for weeks. His worry was how much the extent was of an investigator taking notes and such. I can verify how bad the report was as I can remember him showing me the paperwork. It was 2 inches thick. Something to be aware of people. As for getting an engineers report myself, this is my second 883-1200 conversion, and I ain't saying shit. I just wanted to know if anyone had advice. Thanks for the responses.

You're right pauly investigators never look online aye. I don't know what I was thinking 

So have you taken the reflectors off the bike..... it illegal and most likely need engineering. The 883 frame and kit is more than capable of taking the upgrade it a standard HD upgrade. 

Yes mate, threw all 4 of those to the shithouse in the first week.