Fitting a 70cc kit into a 50cc scoot.

[richie....]

hey guys,

just bought a 2000 50cc Speedfight 1 Liquid Cooled in a act of desperation to get back on 2 wheels after the finance fell through on my bike.

Got the bike for £350 off a woman (teacher) in a nice big house in a secluded back lane, shes owned it for 10 years, has all the old mot's, and history etc, brilliant!

Now, i am 24 and have had a car lisence since 2005. I have my CBT still too. Now, due to no decent 100cc/125cc scoots round here (all heaps off gumtree etc) and getting a new job to start next week, i want a little more power and MPH.

its a totally standard bike (still restricted) and its hitting just over 30. i dont want to buy a 125 bike as i wouldnt mind just holding out now untill the points come off my license and afford another car.

now, after browsing the net i cant get a definate answer.

Firstly, can i de-restric it (its only £12 extra on insurance) and still be legal?

If I were to fit a 70cc kit, what else would need to be done?

Im not bothered about performance parts and what not, i just want a little more oomf for the few miles of 40/50 roads. ide be happy hitting 40/45.

I have a haynes (also included in the sale!) and i like to have a go so wouldnt mind doing the work myself in the garage.

or can i just whack a 100cc engine on?

cheers for any help guys!

here is a link for the bike from the tader, its a topper!

https://www.autotrader.co.uk/classified/advert/201216464732847/sort/default/usedbikes/cc-to/50cc/body-type/scooter/make/peugeot/page/1/postcode/sr40ja/radius/30?logcode=p

[SpannerMonkey]

If you fit a big bore kit, Remember you're going to have to re-jet your carb to get your air-fuel ratio spot on again.
I feel a big bore kit is wasted on a standard intake and exhaust system... It's like having an elephants heart with human lungs... you're just NOT going to be able to get the same potential at all...

If I were you, invest in a nice performance exhaust, jet your carb up properly, fit a high compression head and get a gear up kit. Thats the best sort of set-up I can recommend...

Then if you've still got the hankering for more speed, THEN fit a bore kit...
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My bike? A YX140 powered one-off Monkey Bike, something a little different!

[Nope.]

Ok, if you just de-restrict it then it is no longer a moped. It becomes a motorcycle. You have to inform the DVLA and possibly present it for inspection. This will mean you will probably end up paying more in tax. It also means that when it comes to MOT time it will have to have to meet the standards of a motorcycle as opposed to a moped (A bit stricter on things like tyres). It'll probably also cost a bit more of a fair whack on insurance because its not a moped anymore its now a modified motorcycle.

If you also put on a big bore kit then your opening yourself up to a world of pain. Most of the big bore kits on the market don't meet european standards so they have "Not for road use" Stamped on them. That's your first big problem. If/When the DVLA want to inspect its since its moving classification and tax class (Don't think its liable to an IVA but I could be wrong) then they're going to fail it on the not for road use bore kit (And if the exhaust is the same then they'll add that on). Now you could grind off the not for road use stamp and hope for the best but most testers are usually pretty knowledgeable and will guess that its not for road use.

Oh, and if you had a CBT when you took your car test then you will have a full moped licence. That means you can ride it without L plates in its standard form. If you re-register it as a motorcycle then you'll have to apply L plates.


Basically if you go down the legal route then its going to be a royal pain in the arse. If you don't then your liable to having your vehicle confiscated (Mis-registered vehicle), 3-6 points and a £1000 fine for riding otherwise then in accordance with your licence if you have no L-Plates on and Driving with no road tax since its the wrong class of tax – up to £1,000 or 5 times the annual road tax fee (whichever is greater).

Is it really worth it at the end of the day?
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Former: Derbi GP1 50, Sachs XTC 125, Suzuki GSXR 400 GK73A, Kawasaki ZX7R, Suzuki DR250, Yamaha RD350
Current: 2011 Yamaha XT660Z Ténéré, 2003 Yamaha YZR-R1 5PW (In Build), 2009 Kawasaki ZZR1400

[Pol Anorl]

^^ that
Except the tax as tax is the same from 1cc-124cc
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[andym]

[cb1rocket]

get the 100cc version and stick with that! the 50cc are for 16 yr olds and idiots.

[Nope.]

[jimspeed]

I think the tax class just says "bicycle" on most up to 125cc. just de restrict it and it should do 40 which is safer then 28 in my opinion and if you insure it as derestricted and have L plates that covers the licence angle. I wouldn't worry too much about the dvla bit the best they will do is fuck up/lose the paperwork.

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Hyosung cruise 125(passed test on, sold) Kawasaki el 252 (better than expected but sold on) Kawasaki GPZ500S first "big"bike.(sold) ZZR600 E5..Z750 2007,ER5, currently on a 2008 Enfield bullet electra x and loving it..
,"Alpha-9: Is there any correlation between dyno rod and dyno kits?"

[Sako]

have you thought about fitting a mast and sail?

[Usher4566]

[richie....]

hold on.... so because i remove a restictor.... its now a motorcycle?

so what defines a "scooter" (as it states on my logbook)

its still a 49cc scooter.

Speedo recons im hitting 45 easy but i recon its wrong! ill get my phone GPS speedo on next time im out!

[Teflon-Mike]