250 in a 125 frame... Mot time, Whoopsie.

[Lipsmoker]

Hey Chaps I'm Posting for my friend Ryan.. He's Just Bought a Reiju 125 Mrx Off of Gumtree, It's got a 250 Motor cross engine But still Registered as a 125 on the Logbook.. It needs a little work but he's wondering how it will go through mot? Do they Check engine size

His Friend told him If it says 125cc on the logbook and 250cc on the barrel they will fail it.. but my friends tell me other things lol

Can anyone confirm this? I know it's illegal ive told him..
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Four wheels move the body. Two wheels move the soul.

[P.]

Be dodgy and grind the engine number off and replace with the 125 engine number.

Although would look very suspicious...

Take it hes riding on a CBT...

[0ddball]

Most don't even check the frame number let alone the engine number. You don't even legally need an engine number/cc size stamped into the barrel.
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ZXR750L

[Rogerborg]

There's nothing in the MOT regs about the engine, and you don't have to show a V5C so there's no particular reason for them to care.
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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

[dextersaurus]

They won't bother looking at the engine/frame number, long as you take the V5/old MOT with you.

I never had mine, so they had to take them off the bike.

Shouldn't be a problem though, just grind off the '249cc' plate on the engine.

Out of curiosity, does the engine number on the V5 match the engine number on the engine?

Anyway, if he's on a CBT, it's not the MOT i'd be worried about. It's when he gets stopped and they check it up, as they do with learner bikes, and find that he's riding a 250 on a CBT. That's no insurance, no license, and the bike's gone.

Dunc
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2002 RSV Mille | 2003 955i Tiger | 1998 CBR900RR Streetfighter | Fazer 600 hardtail chop

I was MrDunkable in a previous life. Then questioned why I was the one being dunked...

[Teflon-Mike]

[reggie]

i did it with my dt got impounded 2 times got it back every time
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when the shit hits the fan make sure its facing the other way.

[mysterious_rider]

Read all that then BAM comment underneath...^

[reggie]

the reason the bike got impounded was because ther was no engine numbers and the fuzz suspected it to be stolen

they had it inspected aparently never said a thing about the size

in the eyes whats the difrence to a tinny 2 stroke 125 and a 250

as for the power how many pepole drive around on 50cc that go over 30 and full power rs 125s etc
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when the shit hits the fan make sure its facing the other way.

[Livefast123]

There's quite a bit of difference between a road going 125cc and a MX 250cc. The brutal power delivery on my KX 250 always used to keep me on edge offroad and i would imagine it to be a handful with on road conditions and an 'L' plater.

It's just as illegal as all the above but you open up a whole new can of worms with excise offences involving HMRC, registration offences involving DVLA etc. Why would you want to bother when the above are always looking to make examples out of people.
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Current ride - Yamaha MT-07

[Lipsmoker]

I've spoke to him but he's still going to do it, He Spent £475 on the bike I got more Info on it now

It's a 2005 Reiju mrx 125 Frame
With a 2007 Honda CR250F MX engine (I'm led to Believe puts out Upwards of 30bhp

Everything Works, Electrics,Lights etc Just needs Rear Pads and a Rear Tyre (Obviously someone has been Sliding it around a field)

It's a 125 on the logbook (He's got that now) and there is a Plain Metal Plate Welded on the side of the engine ( I guess to cover up the 250ccm )

He wants to put one of those Power Commander Units on it and a Full exhaust System..

He Knows It Illegal But he's big enough to Face the consequence's if he does get Pulled by the Police and Checked out, Ill Gladly update this Thread if he does for All your amusement but none the less I get to have a ride of this Bike Offroad anyway (So he sais) =P
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Four wheels move the body. Two wheels move the soul.

[Paxovasa]

It is a case of "when" and not "if" he gets pulled.
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Suzuki GSF600 K3 (in the fastest colour, black).

[Lipsmoker]

[P.]

He will get caught, He will get buggered, He will get cocky and twat a car, insurance will take his arse and royally pummel it when they see he has no insurance

[Teflon-Mike]

[Kickstart]

[Livefast123]

The CRF 250 puts out BHP in the 30's

He is going to have to learn throttle control of the highest order as MX engines deliver their power in a kind of all or nothing way and the 4 strokes have brutal low down torque.I hope when he is concentrating on all the other things going on that he doesn't lose sight of this.

While I don't agree with some of the current legislation it's the law and you've got to be some type of n*bhead to put a 250 engine in a 125.

It sounds different
The engine looks bigger
That welded plate won't look suspicious at all.....

I can guarantee that once the initial nerves disappear he will be riding like a cocky boi who has a 250 engine in his 125. He will get stopped as not only will he be riding like a n*b but he will have no 'L' plates on a bike that looks like it needs them. I also hope his 50cc frame can handle the power of a fully fledged MX engine without snapping and twisting.

At best I hope he is ready for a world of pain , £425 is about a quarter of what his insurance will go up when he is caught. At worst please make him get an organ donor card.
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Current ride - Yamaha MT-07

[Lipsmoker]

I'm Not going to Argue with what anyones said because Frankly it's all true but yeah ill update it if anything happens lol..

https://a5.sphotos.ak.fbcdn.net/hphotos-ak-snc6/227668_1767287180356_1184473155_31652036_7646779_n.jpg
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Four wheels move the body. Two wheels move the soul.

[Paxovasa]

[Lipsmoker]

[binge]

Fair play on the bike! I love engine swaps etc.
Would be cool to just do it legally, and inform the DVLA. They shouldn't question it, just send the V5 back with the new Engine number and CC on it. And you'll get it back a couple of weeks later. End of.


Nothing wrong with the MRX. I used to have an SMX from Moto-Roma. Identical bikes basically.
The frames, They are stupidly strong.
As long as the conversion was done properly, it should be fine.


The MOT wont be affected by the engine either. The only thing they really check is that the bike is safe. If the engine looks like it's about to drop out, it'll fail.
If it's done well, it'll pass.


Here's my old hybrid...

https://a6.sphotos.ak.fbcdn.net/hphotos-ak-snc3/25880_387434410605_506045605_3824646_8184333_n.jpg


PROPER Chinese frame from Stomp.
Shoe-horned a Yamaha TZR125 2RK engine in there. Granted, I did all relative upgrades too. Like KTM65 forks, Brembo brakes, billet swinger etc.
But it was still a 26bhp motor, in a frame which once he'd a 3bhp 125 pit bike engine.

Strange that I didn't really get any haters when I made my build thread on that. :\



Good luck I say. And get some more pictures!



Ben
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- Honda XL125S - CBR400 NC29 - VFR400 NC30 - CBR400 NC29 - TL1000R - TeeZeR Pit! - Bandit 12 - YZF450 - LuckyMX125 Pit! - Demon X XLR 140 Pit!
- Stomp KZ 160 Pit! - Demon X D-link 140 Pit! - CRF50F Mini-Pit - MonsterMoto 155cc MiniSM - Honda Chaly 150cc - Yamaha 98' R1
- Honda Chaly 140cc - Thumpstar 190cc 4v MiniSM - Aprilia RS125 Pit-Bike -

[stirlinggaz]

same, i never got any bad karma when fitting a 200cc atac lump into my mtx125....
alright i have a full licence, but the principals the same,it was 125 on the log book AND insurance.
cylinder DIDNT have the capacity stamped on the side, so just looked the same.
but produced double the intended bhp (tbh,i was only wanting the atac, but there impossible to find on 125cc) performed FAR better, with off the clock speeds....
i was stopped umpteen times by over zealous coppers (both standard plod & traffic nazis).
never once got any convictions or points. but was mainly stopped for doing handsignals, sometimes at night. (bike was made pre april 86) they werent clued up enough to tell the difference between 12bhp & 30bhp.

& im currently trying to shoehorn a 600cc single cylinder 4t (rotax604), into a rs125 chassis, ok, it will have beeffed up suspension etc but the frame itself will have realitively few modifications.
i always like to see different engines in different frames, upgraded forks etc.
why settle for bog standard?

ok, the whole cbt thing is a different argument, but come on, how many 35-45yr old riders didnt ride 250's with outragely tuned cylinders, bbks etc etc "back in the day"?
BEFORE we had cbt's, so were riding without any proper instruction, & there still a load of us here & still riding.....
i know i did...... all part of the learning process.

cheers,
GAZ

[P.]

[stirlinggaz]

[stinkwheel]