Getting a 50cc moped upgraded to a 70cc?

Runner07 · Nova Slayer Joined: 08 Jun 2007 Karma :

Hi,

Ive recently been looking for a moped to buy for my first bike. I have my eyes on a Gilera Runner SP 50. The bike seems okay and is a price of £650. The bike has been "Bored" to a 70cc. A 70cc kit has been installed. I dont know to much about it but i was told that it shortens how much you get out of the bike.

The bike is 2003. And if i do buy it ill be driving it for about 12 months max. Can somene tell me abit more about 70cc bore kits for 50cc mopeds and if it should be fine for 12 months from now on the road.

Thanks

Regards
James.

feef · Energiser Bunny Joined: 11 Feb 2002 Karma :

If you're 16, you're stuck with a 50cc moped, and a 30mph limit. If you increase the size of your engine or it's top speed, it becomes a 'motorcycle' and you would therefore, be riding without a licence or insurance.

As it is.. a bore kit can shorten the life of the engine, as the crank and end bearings aren't designed for the additional load.

a
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Runner07 · Nova Slayer Joined: 08 Jun 2007 Karma :

Ok thanks.

A 50cc moped that have been bored to 70cc, does it pass MOT?
I understand that as im only 16 the speed limit is 30mph. But where i live no-one will drive a 50cc moped with a max speed of 30mph. Everyones moped is de-restricted an hits 55+ lol.

If i was to get the 70cc moped would i be able to set-up insurance and MOT + Tax fine?

Here's the link for the moped advertisement.
https://www.gumtree.com/london/60/10178660.html

Thanks for the advice!!

Mudskipper · World Chat Champion Joined: 22 Aug 2006 Karma :

TheShaggyDA · Repost Police Joined: 14 Jun 2004 Karma :

Runner07 · Nova Slayer Joined: 08 Jun 2007 Karma :

Ok. Im in a bit of a dilemma now lol. Well at least the Moped will pass MOT/Insurance ETC with it bored to 70cc. But as you say its upto me then.

Well thanks everyone for your info/advice!

One more quick question, Say i bought a brand new 50cc moped (2007 style) and i got it bored to a 70cc. How long would the bike be in good use with the 70cc bore kit installed?

kiers · Could Be A Chat Bot Joined: 29 Mar 2007 Karma :

just try and get a 50 thats only been derestricted, bore kits and shit like that just make it a bit of a liability, its sure to go bang in the not too distant future and it will be more difficult to sell on.
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feef · Energiser Bunny Joined: 11 Feb 2002 Karma :

-Savage- · World Chat Champion Joined: 10 Jun 2005 Karma :

feef · Energiser Bunny Joined: 11 Feb 2002 Karma :

veeeffarr · Super Spammer Joined: 22 Jul 2004 Karma :

Is an extra 20cc worth losing your chance to experience an extra 75cc legally in a year? And then possible > 550 if you pass your full license?

Think about it

T

divuk83 · World Chat Champion Joined: 27 Nov 2003 Karma :

Ignoring the legal side of things, the main problem with 70 kits on 50cc bikes/peds is they are not fitted propperly or jetted correctly. Also when fitted without taller gearing they rev higher and don't even go any quicker! I would say the majority out there are setup badly and I would avoid anything that is not standard if I was not getting from a dealer/tuner or someone who knew what they were doing, otherwise the chances of it going bang are quite high.

Having said all this, a properly fitted and setup 70 should be just as reliable as the standard barrel.

Dave

feef · Energiser Bunny Joined: 11 Feb 2002 Karma :

divuk83 · World Chat Champion Joined: 27 Nov 2003 Karma :

If you put a MHR or a Manston race spec kit on then yes. If you put a cheap, mild tuned, cast iron 70 on its nothing the standard crank can't handle.

Dave