50cc moped with 80cc big bore kit

[ROSSI46]

Hi I'm a 16 year old lad and my moped dropped a valve on me the other day and screwed the piston, the cylinder head and the spark plug so it needs to be fixed, now I was saving for a Yamaha rd-125 but a lot of that money has now having to be used to fix my bike, I'm 17 in April but I won't have the money by then so is it worth getting a 80cc big bore kit so when I'm 17 I still have a bit more power.

[1198]

To be legal you'll need to tell your insurance too. You're unlikely to get found out if you don't but a sharp eyed plod may spot the 80cc mark on the cylinder - especially if you're giving them reason to look. Equally if ever an insurance assesser looked they would definately see it - and would have a sense of humour failure.

[Andy_Pagin]

[dydey90]

Sell it, take the bus for a few weeks and put the money towards a 125.

Don't fuck about getting a two stroke. You'll struggle to find one in good condition, then you'll struggle to keep it that way.
Also, if the fuzz see you doing 80mph on the back wheel with an L plate on the back then they'll throw the book at you.

Get a four stroke, you're only allowed 15bhp now anyway so you'll only be saving yourself money.

I can see why you want a two stroke, I'd love an NSR125, but not as my only option and especially not if money is tight.
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This post is probably not serious and shouldn't be taken literally.
Past: CBR125,ER6f NINJA 650, ZZR600 Current: VFR750

[Nobby the Bastard]

You'll find that the question 'have you ever had insurance refused or cancelled' doesn't have a timescale so you'll be explaining and paying for that for the rest of your life.
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trevor saxe-coburg-gotha:"Remember this simple rule - scooters are for men who like to feel the breeze on their huge, flapping cunt lips."
Triumph Sprint ST 1050

[Teflon-Mike]

'Moped' restrctons exist only in the law that says that a bike with an engine less than 50cc and not capable of exceeding *30mph is one.

You don't need a particularly beedy eyed plod to spot a ped going over 30mph to start poking about on the back of barels to prove what has just broken the speed limit for the vehicle type cant be that type of vehicle.

OR to start chuckig the book at you for an unroad worthy vehicle... as if it was OT'd would have been as a moped, not a motorcycle, and to lower standards a moped wouldn't automatically meet. Or question validity of insurance, if insured as a moped. and its not one... or the validity if registration, etc etc etc.. rap sheet could get very very long in deed...

In fact, it would probably be breaking fewer laws to buy a 1000 and slap the moped's number plate on it, and try claming that was 'just' heavily modified....

Skirting that issue however..... moped... no, buggered moped, with a dropped valve.... err.. yeah.... how the hell did you 'drop' a valve?

In days of yore, reving the shit out of an egine to the pont that the valve head slamming aganst the seat hard enough, often enough make the stem stretch... that would tend to show up in the tappet clearances closing up a lot, and qute often, could if ignored, result in the valve head falling off.. a 'dropped' valve.

I actually dubt very much you truy dropped a valve.. I suspect you may have had a piston valve enounter that has bent one..... whether case of that is any more paleteable, I'm not sure.... poor maitenance, tappets well out of asjustment and ragging the shit out of the thing would do it....

Either way.. first up you have a knackered piston, probably a well chewed cyinder head, and only one valve....

Fix that lot... you still have a rather questionable sense of mechanical sympathy and how much better would replacements fare, given as little care and attension and ragged to crap as hard?

Now add 60% more displacement and the notio that that MUST make it SOOOO much faster.....

You going to rag it any less, or are you gong to be even more inclined to rag it even harder cos it goees Wa-a-a-ay fast now!

Go for it kid!

Restrctons workng at ther best. You'll send more time n the shed with spanners talkng about how fast t will go... eventually, than you ever will actually scaring, or more likely amusing, even the most diullard plod, whole know they have an answer to thier end of month conviction problem about to land in thier lap!

My advice? Scrap it! Get the bus for a month, or more. Ponder WHY this bike got broke, and when you are old enough, and can afford a 125... think long and hard about that, and how to avoid THAT ending up on the same scrap heap.
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My Webby'Tef's-tQ, loads of stuff about my bikes, my Land-Rovers, and the stuff I do with them!
Current Bikes:'Honda VF1000F' ;'CB750F2N' ;'CB125TD ( 6 3 of em!)'; 'Montesa Cota 248'. Learner FAQ's:= 'U want to Ride a Motorbike! Where Do U start?'

[groovylee]

holy shit. I just upvoted one of Tefs walls of text

he's right though.......


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Past - 1988 honda revere 600, 1996 kawasaki gpz500s, 1999 Yamaha R6

Current - 2002 Aprilia RSV1000R & 1999 Kawasaki ZX6R

[dydey90]

[ROSSI46]

Why have a go at me as if I was being a prick. The the garage I took it to said I dropped a valve so no need to start on that and I do look after my bike thanks. And yeah sure I do "rag" it but what 16 yr old lad doesn't, it's called having fun. And there's no need to get sarcastic about it being way faster, I know it won't do much more top end but it will go off the line better so thanks for the advice but no need to be a prick about it

[secretagentmo...]

Increasing the bore size will lose you more money than you will save. Could be worth looking for an engine from a breaker for it, keeping it as a 50 means there are other young gullible idiots, sorry I meant eager buyers for it.

You can then put the money you get for it to a bike that is a motorcycle from the get go!

[ROSSI46]

Hahaha the way I look at it I'd rather ride than walk or be on a bus, plus they are quite fun when your with a group of mates, thanks for the advice

[Bozzy]

16 y/o OP comes on bike forum for advice. Gets given advice which isn't what he wants to hear, then spits dummy out and name calls.

Why am I surprised?
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2004 SV650S >>> 2009 Street Triple R

[TheManWithThe...]

It's definitely not worth it.
Just chalk it up as one of the shitty things life throws at you.

You'll find that fucking around with an engine that wasn't designed with speed in mind will cost you infinitely more money and cause you infinitely more problems than simply fixing it and keeping it as a 50cc once you factor in all the carb tuning and other upgrades that will most likely be required to get a big bore running well, without considering all the legal issues the folks above have listed.

I still rode my 50cc moped for about 7 months after i turned 17, and 3 of those were with a full license, so i fully understand how much you want to get on something bigger, but trust me, it just makes it even better when you finally get there.

[Teflon-Mike]

[Billy Balthorpe]

I know its not what you wanted to hear Rossi46, but I'm afraid some of they guys on this thread are talking sense when they say "Save up and buy a bigger bike". Maybe you should lower your sights a bit and buy a 125 which has depreciated to a point where you wouldn't lose any money by selling it in 12 months when you have saved up enough of the extra cash required to buy your "ideal" 125, or better still, use the cash to pass a further test and buy another "depreciated" bike over 125, which you would probably get for the cost of upgrading your crappy 125 to your ideal 125.

A tatty YBR125 can be had for £500 to £700, if you look hard enough and have a bit of luck, a CBR125 which needs a bit of work can be had for the same cash. I fixed up a CBR125 for a mate of my Lad on the road and MOT'd for £700. A few parts from ebay sorted it easily.
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M.O.B. Successfully taking the piss since 2014.

[grr666]

[ROSSI46]

I didn't mean to come over rude I just didn't think there was any need to be sarcastic and rude about it, and no I'm not getting a corsa because I don't like cars, and I find it stupid that older guys take the piss out of 16yr old lads for having mopeds when that's all we can have and at the end of the day you've got to start somewhere

[Polarbear]

It's a sad state of affairs when I'm agreeing with every word above.
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Triumph Trophy Launch Edition

[Kris]

What ped is it?

For what it's worth (not a lot actually ) I actually think 50cc peds can be pretty dangerous, especially in hilly areas where you'd struggle to achieve 10mph up a steep road. An 80cc kit would probably help maintain speeds a bit better around where I live.

But face facts, it'll most likely grenade quite quickly, it will probably make it harder to sell and you could* get in trouble if plod found out (*unlikely to happen but still a chance).

I'd always recommend a 'proper' 125 as a first geared bike. So in your situation I'd say save up for that. And by proper I mean a decent one, not a Chinese POS.
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www.prisonplanet.com

[arry]

We're just a bunch of doddery old farts that have heard it all before.

[Rogerborg]

[Kris]

[stevo as b4]

OP please believe us that trying to fix a four stroke moped is not economic with the engine damage it has sustained. And fitting an 80cc big bore kit on one won't give you hardly any more power, and won't satisfy any 17year old who could have a 125.

The most basic 10bhp commuter 125 would be massively faster and better than a cheap tatty moped with a potentially unreliable 80cc kit fitted. Also if it dropped a valve as a std 50cc, how much confidence are you gonna have in it when tuned? I'd want rid of like yesterday even if I had to give it away or scrap it.

The guy who said cycle or get the bus for 6weeks or so is 100% right. It'll give you time to find and save your spare cash for a decent second hand 125, of which there's plenty out there. If your not into cars and don't want or need one, I'd suggest getting a good quality Japanese 125 second hand.

You could find a nice tidy CBR125 or something similar, that'd be a nice bike for two years if you look after it, and a sporty looking 125 is a good bike. I'd be very happy with a nice clean CBR125 at 17, and it'd be a useful smart and cheap to run bike too.

Im not advocating illegal riding, but if you just had a go on such a 125 that belongs to a mate, even on private land you'd see how much better a 125 is and that forgetting about mopeds makes so much sense.

Its less than two months until your birthday, and it's so worth waiting that long even if you have to walk everywhere until then.

[ROSSI46]

I did have a Suzuki uf50 2 stroke but someone pulled out in front of me and the bike was beyond repair so I got a cheap Chinese direct bike db50qt11 it's a 63 plate

[Rogerborg]

Direct Bikes sell the "quality control means check most of them have two wheels" vehicles that other importers won't touch. They are effectively disposable, and I wouldn't throw good money after bad on one.
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Biking is 1/20th as dangerous as horse riding.
GONE: HN125-8, LF-250B, GPz 305, GPZ 500S, Burgman 400 // RIDING: F650GS (800 twin), Royal Enfield Bullet Electra 500 AVL, Ninja 250R because racebike