Honda MT50 Big Bore Kit

[Fladdem]

Hello everyone, I am going to be 17 soon and my parents, who care about my safety, have forbidden me from getting a 125 but I am allowed to do what i like with my Buzzy thing, 1991 Honda MT50, this includes BBK's. I was wondering whether there is a possible way to get a different chamber and piston and just slot it in to the engine whilst still keeping the 50cc kit too, because i would like to be able to, eventually, sell it on later but with both kits depending who wants it. If this is not possible would getting a second engine with a 70cc or similar capacity and swapping them as and when i like be feasable? Bearing in mind the engine number, i am not sure whether it is illegal to have a different number than the one registered.
Thanks in advance, sorry for it being longwinded/

[Marmalade]

You can buy a piston, rings, barrel etc kit that'll pretty much bolt on.

Fitting a different engine would work and it isn't illegal but you should tell dvla so it shows correctly on the log book.
I don't know what would fit but it'd be a 100 or 125 anyway and then insurance would most likely rocket as bike will be modified, they may want an engineers report and then you'll be stopping a 100cc bike with 50cc brakes.

You are far safer buying a 125 than staying on a souped up 50. Your parents with due respect have no idea.

A 125 will keep you up with the speed of traffic in most situations rather than being shoved into the kerb by people making daft overtakes at 40mph. You also have a little more power to pull yourself out of dangerous situations.
You need to have a serious chat with them.

I'm trying to get my son to sell his flying wasp 50cc and buy a 125 for these reasons.
____________________
Nobby the Bastard: How yo tell the difference between the actual japanese and her just screaming because she's had live fish stuck up her arse? [url=https://www.nicks-shop.co.uk/bcf-goodies-15-c.aspGet BCF stickers and things here[/url] Reflective helmet stickers - Legal requirement in france - Clicky

[Doovy]

Punch them in the....

oh wait - Yeah, what Marmalade said.
____________________
Yamaha RXS 100 > Honda CD 250 > Honda Hornet 600 > Honda CBR 600RR > Yamaha RXS 100 > Kawasaki ZX6R J2 > Yamaha FZ1

[truslack]

Put a Honda H100 engine in it. It should go straight in (AFAIK)
____________________
Current: Suzuki RG 125 Gamma, Honda H100, Triumph Tiger 800XC, Suzuki SV650 (minitwin)

[Teflon-Mike]

Doing it legally is opening a big can or worms.
What you have now is technically a moped.
Make it bigger than 50cc or more powerful than 3.5bhp (regs when it was built) and it stops conforming to the regs for a moped and becomes a motorcycle.
As that's a different classification fo vehicle, with different construction & use regulations, it would technically need re-registering, and full VOSA inspection to gain single vehicle type approval as a 'motorcycle'.
Mopeds enjoy a lot of relaxed or exempted regulations over motorcycles.... like motorcycles need tyres with 1mm of tread, moped only has to have 'visible' tread, and motorcycle has to have tyres that are of apropriate construction and marked with speed and load ratings.... mopeds merely have to have tyres.... you can use push bike tyres on them if you are fool enough.
Similar with things like suspension, and lamps.
AND, the kicker.... your moped is what, pre 1993? Regs in force back then even for a motorcycle are different t what is in force now... BUT re registering it as a motorcycle, they will apply the Single Vehicle C&U rules, not those for either current vehicles or old ones.... put a brand new Land Rover through VOSA and it would fail test, becouse the corners of the wings and bumper dont have big eniough curves, and teh switches have too sharp an edge....
as a production vehicle 'fine' as a 'kit car' fail....

Doing it ILLEGALLY is asking for trouble, soon as you go over 40mph they know its not a moped by any of the standards in force, and if they then discover its not inc confoprmance to the locg book and is illegally modified they can throw the book at you....

You might as well go hand the bike in at the police station along with your licence, and ask if they would be so kind as to at least let you watch them crush the bike and burn your licence before they take the next fifty years pocket money off you in fines!

As said, a 125 is the answer, and if your folks don't approve, then, well, you are on to a looser.....

However, licence laws change in eighteen months; then at 17 you will, I think, (no one knows for sure yet!) only be able to take a test to get an A1 licence allowing you to ride a 125. You'll have to be 19 to take test, DAS style on a 500cc bike, to get n A2 licence, which will have permenant 45bhp power restriction on it, rather than a two year power limit, and if you want a bigger bike, you'll have to do the A2 test, and hold that two years before you can apply to do the 'A' test for an unrestricted licence, again, DAS style on full power bike.

Ie its going to get harder and more expensive, and if you dont get licence in the next 18months, you'll be stuffed by the new laws, and will have to wite to even do the A2, until your 19th birthday, and two more years, to do A at 21....

My advice to you young man would be to play it cool..... keep your moped, if thats all you are 'allowed', and tell yoru folks, "Fine, you wont let me have a motorbike; but you never said anything about not letting me have a motorbike licence!"

THEN, if you have the money to start chucking at BBK's and expansion chamnbers and stuff, so the feds have EVEN more excuse to hassle you and relieve you of it....

Use it instead on doing some rider training, on a school bike, and your tests, likewise on a school bike.......

You can space out lessons to spread the cost, and use your 50 to 'practice' most stuff at least, between lessons.

Stick at it.... dont nag parents for the money for it, or keep harping on about it.... just get about and DO it, quietly, upfront, letting them know where you are going and that you are 'doing' rider training.... and not asking them for anything to support it....

And SEE how they react.......

Amazing how ACTIONS speak louder than words..... and rather than trying to hammer them down, with words... "I wanna mo-bike! Gimmeee Mo-bike!" like you rpobably pestered for an ice lolly when you were three or an X-Box when you were twelve......

Show a bit of maturity and DONT expect them to hand you big flash 'toy' to hurt yourself with.....

JUST go do the lessons, and work towards the licence.....

My bet ios, that one or other will get curiouse and ASK what you are playing at, and why you are doing it, WHEN they have said you cant have a bike......

Which is when you explain the licence changes, and that you really WANT a bike, but, if they wont let you have one, FINE.... but nothing stopping you get the licence to ride one, and under current rules where the age limits are favourable, and the stystem lets you do it, without spending huge money......

At SOME point, showing that kind of maturity, and a little 'patience' and dedication, and putting in a little effort for something that DOESN'T give you instant thrills......

Is likely to give them the idea that MAYBE they are wrong, and you MIGHT be "Sensible" enough NOT to kill yourself on a 'propper bike'...

Meanwhile, they also have the idea in the back of thier head, that with a licence, as soon as you are out from under thier roof, you could go get a mega bike, and there would be effall they could do to stop you......

Might NOT change a thing, but could change a lot... and you never know.... showing a bit of 'the right stuff' they may surprise you and say something like "Hmm... well, I suppose when you have the licece, you WILL want a bike.... so, IF you pass, we'll see what we can do..."

If not, well, your no worse off, and spending your money to ride a school 125 is a lot more fun than pushing home a siezed tuned moped YET a fucking gain.... and a licence in your pocket, with teh 33bhp restriction clounting down to 'big bike' before you are 20, puts you WELL ahead of the game and most lads your age, who'll as like have a shock when they find they cant really have much more than they got even if they pass a test, or will have to spend a hell of a lot of money to do new tests to only get 'half' a licnce, or wait even LONGER until they are 24 to do DAS......

Up to you, really, but makes sense to me.... and I have kids your age, and older, and younger, and know what my reaction to them having bikes has been..... and its ALL down to THEIR attitude and aproach.....
____________________
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?'

[susanexpress1]

useful information. thank you
____________________
WOW Gold
Buy WOW Gold
Cheap WOW Gold

[Pernig]

The H100 engine goes in. You might have to drill a hole in the frame where the top mount (on the head) goes in, as this is higher up on the larger engine. You will probably have to use a H100 exhaust, too.

There is a very useful website here, which documents one man's engine transplant on an MB50, which is again similar to yours. There is also a collection of scans of an old series of tuning tips from a bike magazine on there, should you want to go down that route. These engines are in quite a low state of tune.

If you decide to pop a H100 engine in, keep us posted. It's something I've wanted to do with an MT50 for a while now.
____________________
H100 Breaking for spares

[FBSF]

Teflon Mike speaks sense.

I had a mate who put an Autisa big-bore 65cc kit on his MT5, and read and studied for months on how to tune it by filing the ports, re-profiling the squish bands etc.

It did go relatively quickly for a small bike, and had a noticable step in the powerband which did feel good, but got blown away by a restricted 125. And he had to use fully synthetic 2-stroke at £10 a litre to stop it blowing up.

Spend your money on getting your full licence before it's too late and changes - you've put up with the MT5 for now, another however many months more won't be that bad...

[Fladdem]

Thanks for that everyone, i think that it is probably the best thing to just put up with for a bit longer and take my test to convince them i am not a maniac on a bike like some others I know. Thanks Marmalade and Teflon Mike, that is quite useful for me, as i wasn't aware of any liscencing changes, so i will seriously consider my test before my CBT runs out. I just have to convince my Dad really, he has had a liscence since he was my age and hasn't fallen off yet, he's now 50, or had any scrapes, i think he is hoping that i will end up like him. I must just be taking the wroing approach, "i would like you to go halves on a 125 with me so i dont have to be scared at going 38mph down the harbury lane with moronic car drivers up my ass everywhere". That probably wasn't the best reason for sharing a bike with me.

[Teflon-Mike]

[Fladdem]

well good news, i talked my dad into going out for a ride with me, i was hoping he'd take his GS850G, but no... we went bimbling on a clapped out Honda MT50 and an equally clapped out Honda Cub 70, my God did people look at us like 'how are they even road legal?' but regardless he seems to be impressed with my riding, i tried to do absolutly everything by the book, life savers at every turn, riding with 75% in front 25% mirror checks, no close calls, no red lining of the engine, and no speeding, not thet he know if we were speeding or not, i broke the speedo cable last year when i learnt to ride it in a field before my 16th, i still claim the pothole came from nowhere . But we are hoping to go halves on a sinnis blade/apache brand new. They seem to be okay bikes, they are like the topend of the chinese market, simply because with 2 years warranty, when inevitably i fall off, hopefully it won't be too bad, then i never have to do it again and any damage should be covered, 3 years without an MOT and a suzuki engine, that they helped design with suzuki to use in the first place, Just wondering if you had anything else useful to say as well