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WRX 125 -250 conversion

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Jack_2016
L Plate Warrior



Joined: 24 Oct 2016
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PostPosted: 00:08 - 25 Oct 2016    Post subject: WRX 125 -250 conversion Reply with quote
Was thinking of upgrading my Yamaha wr125x 2016. Already have aftermarket air and oil filter have a stainless manifold and full arrow exhaust. I plan to then bore it out with the Athena 180cc big bore kit and then hooking up either a power commander 3 or power commander 5. A friend said it would be cheaper to fit a 250 engine from the 250 WRX. Is it possible to put the 250 engine in and what would I need to do if possible ?
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Pjay
World Chat Champion



Joined: 18 Jan 2016
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PostPosted: 03:25 - 25 Oct 2016    Post subject: Reply with quote
An A2 Licence.
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Jack_2016
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Joined: 24 Oct 2016
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PostPosted: 13:37 - 25 Oct 2016    Post subject: Reply with quote
Pjay wrote:
An A2 Licence.

Will be but I plan on keeping this bike for life and want to ramp it up a bit mate
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Teflon-Mike
tl;dr



Joined: 01 Jun 2010
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PostPosted: 14:07 - 25 Oct 2016    Post subject: Reply with quote
Jack_2016 wrote:
A friend said it would be cheaper to fit a 250 engine from the 250 WRX. Is it possible to put the 250 engine in and what would I need to do if possible ?
Why ask us if your freind has all the answers? ask HIM!!

Jack_2016 wrote:
Pjay wrote:
An A2 Licence.

Will be but I plan on keeping this bike for life and want to ramp it up a bit mate

Something of an inherent conflict in those two ambitions.

You are trying to 'ramp up' a very slow bike, to something that is, at best, only moderately less very slow.

Best of the best 125 two stroke 125's achieve about 30bhp, very very unreliably, and are about as powerful and fast as a thirty plus year old Honda 250 4-stroke single, that itself is still as or more powerful than modern eco-mentally-approved 4-stroke 250's, and STILL none of them are exactly fast or powerful motorcycles, compared to anything else you could ride on the same licence that you should have to use one.

To get A2 you have to ride a 400cc+ bike with near enough full compliment of 45bhp, if only for the actual test; WHICH is very likely to change your perceptions and aspirations and ideas; and the notion of keeping your WRX 'for ever' if it even lasts that long, when modded for 'performance' and if amateur mechanics doesn't kill it, trying to exploit the minuscule bit more it has, probably will.

125's best features are that they are useful learning tools or cheap commuters.

Use as intended to learn, and save your ambitions for when you have a licence that lets you ride anything 'better', and enjoy the cheapness in the mean time, NOT spending money to make it less valuable and less reliable.
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Jack_2016
L Plate Warrior



Joined: 24 Oct 2016
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PostPosted: 14:24 - 25 Oct 2016    Post subject: Reply with quote
Teflon-Mike wrote:
Jack_2016 wrote:
A friend said it would be cheaper to fit a 250 engine from the 250 WRX. Is it possible to put the 250 engine in and what would I need to do if possible ?
Why ask us if your freind has all the answers? ask HIM!!

Jack_2016 wrote:
Pjay wrote:
An A2 Licence.

Will be but I plan on keeping this bike for life and want to ramp it up a bit mate

Something of an inherent conflict in those two ambitions.

You are trying to 'ramp up' a very slow bike, to something that is, at best, only moderately less very slow.

Best of the best 125 two stroke 125's achieve about 30bhp, very very unreliably, and are about as powerful and fast as a thirty plus year old Honda 250 4-stroke single, that itself is still as or more powerful than modern eco-mentally-approved 4-stroke 250's, and STILL none of them are exactly fast or powerful motorcycles, compared to anything else you could ride on the same licence that you should have to use one.

To get A2 you have to ride a 400cc+ bike with near enough full compliment of 45bhp, if only for the actual test; WHICH is very likely to change your perceptions and aspirations and ideas; and the notion of keeping your WRX 'for ever' if it even lasts that long, when modded for 'performance' and if amateur mechanics doesn't kill it, trying to exploit the minuscule bit more it has, probably will.

125's best features are that they are useful learning tools or cheap commuters.

Use as intended to learn, and save your ambitions for when you have a licence that lets you ride anything 'better', and enjoy the cheapness in the mean time, NOT spending money to make it less valuable and less reliable.






That was another reason as to why I was thinking of tinkering with the insides because I want to grab more of an understanding and for future experience. Just looking for inputs such as would I need to upgrade the carb if I bore it aswell. Don't want to do the A2 yet got 1more year before I can sit the the A2 unrestricted. I'm guessing it's impractical to stick a bigger engine in because no one has addressed that
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Teflon-Mike
tl;dr



Joined: 01 Jun 2010
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PostPosted: 15:03 - 25 Oct 2016    Post subject: Reply with quote
Jack_2016 wrote:
Don't want to do the A2 yet got 1more year before I can sit the the A2 unrestricted

that doesn't make sense.
There's three licences A1 125 only, A2 45bhp any capacity A - any bike
ages are 17 for an A1, 19 for an A2, and 21/24 for an A depending whether you do accelerated access from an A2 or direct access from a provisional.
CBT & L's is provisional entitlement, a 'learners' licence to learn on and practice for tests NOT pratt about wasting time avoiding tests waiting until you are old enough or rich enough to get a 'better' licence.

If you are on CBT & L's even more reason to stop pratting about trying to cheat the system to get a bigger bike than you are allowed; better use of teh time and money would be to get that learning and practice and go sit your A1 tests, to distch the L's, and get a head start towards doing higher licences when you are eligible.

Jack_2016 wrote:
That was another reason as to why I was thinking of tinkering with the insides because I want to grab more of an understanding and for future experience.

Buy an MOT failed chinky CG coppy and play spanners to your hearts content with it then. Or do a class at college on mechanics.
Jack_2016 wrote:
Just looking for inputs such as would I need to upgrade the carb if I bore it aswell. I'm guessing it's impractical to stick a bigger engine in because no one has addressed that

As to engine swaps; there's folk that have put GSX1100 motors into pit-bike frames....... with enough madness, a little met-fab skill and a big enough hammer almost anything is 'possible'!

Practical is rather more circumstance dependent.... and since AFAIK the WRX is fuel injected..... doesn't have a carb... which sort of begs more questions than it answers, and conclusion that for you... No, its probably NOT very practical an idea!

Even if the WRX125 & 250 share a lot of common componentry and the engine would be a bolt for bolt 'swap'; you would need to match the 250 engine with the efi and electrics, and exhaust and everything else that supports that engine with the bits for the 250 model.. and effectively 'be' a WRX250....

Only as far as registration & insurance is concerned it wouldn't, it would be a modified WRX125, likely if you declare the mods to cost more to insure and tax, and be less valuable to sell than the bike you would have to break to get all the bits to build it!

If you dont declare it and are happy to break the law riding a bike you don't have licence entitlement for; why go to the hassle; JUST riding the 250 'as is' would actually clock up fewer criminal offences than trying to dress up the 250 as a 125!!!! Oportunities you give them to stack the charge sheet is stupid!

And for what? The criminal genius of a slow bike that's illegally minisculely less slow by a couple of mph!

Criskey; might as well be hung for a sheep as a lamb, and if you DON'T think that you should have to comply with the licence laws, and insurance laws and everything else, go get a fucking R1 or something and go as illegally fast as you dare on that!

OR... think long and hard about it, and make the ssyetem work FOR you rather than against, and use time you might 'only' be allowed a 125, as intended, and go learn something, get the propper 125 licence and ditch the L's as a head start to getting an A2 licence when eligible and being able to LEGALLY have factorially, rather than fractionally more performance for it, and again, work towards the 'early' A ride what you like licence via accelerated access, to have as much bike as you can handle LEGALLY, and without having to lift a ruddy spanner, or 'waste' money making bikes less valuable and less reliable in the process!
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Nobby the Bastard
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Joined: 16 Aug 2013
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PostPosted: 16:15 - 25 Oct 2016    Post subject: Reply with quote
Oh god, not another one...
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stevo as b4
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Joined: 17 Jul 2003
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PostPosted: 17:42 - 25 Oct 2016    Post subject: Reply with quote
You won't find a WR 250X engine and if you did it would cost stupid money, for something with acres of headaches and hassle to fit it in the WR125 and get it working.

For a bit less than a grand, you'll get your 180cc big bore kit and all the go faster bits like cams, throttle bodies etc, installed and dyno set up with your flashed ECU or power commander etc. It'll be the cheapest option for more power from a keeper bike, and should see you to about 18bhp r/w.
So maybe a flywheel 21-22bhp.

Whether it'd good value or not is another thing, but it's all your realistically going to do to see decent almost 50% power gains on that bike.
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nitrosurf
Trackday Trickster



Joined: 18 Jun 2010
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PostPosted: 19:21 - 25 Oct 2016    Post subject: Reply with quote
If you want real ultimate power (sorry Rog, had to reuse that), then get something like a YZ250 2smoke and play off-road. Keep the wotsit 125 you have now for learning road craft on then get a proper license. Or get the license now (I pick no side, as I wish to remain as Switzerland as possible as far as that argument goes!), whatever suits. If you cock about with 'ramping up' a blinking 125 you'll chance getting the 5-oh-no kicking your arse and for what? 81mph instead of 69? Meh.


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rhys99
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Joined: 23 Feb 2015
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PostPosted: 20:01 - 25 Oct 2016    Post subject: Reply with quote
Why would you want to keep the 125? it's heavier than a lot of bigger CC supermoto's. Spending so much money is stupid, £500 for the 180 kit, 300 for the power commander and you've already spent the £350 it costs for an arrow full system. For that plus the cost of the bike you've spent over £5300 without the additional labour costs of fitting the kit, all this on a bike that would still lose against some £700 shitter of an RS 125.For that kinda money you could buy a new ish KTM 690 or any other supermoto for that matter.
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Teflon-Mike
tl;dr



Joined: 01 Jun 2010
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PostPosted: 20:24 - 25 Oct 2016    Post subject: Reply with quote
rhys99 wrote:
all this on a bike that would still lose against some £700 shitter of an RS 125.

Which itself would be blown into the weeds by a sub £500, {cheaper than the big-bore alone!} ER5, that most folk with a licence to ride one describe as duller than ditch water, but still has a good 50% more power and a genuine 120mph top end.

Whilst on another planet, I have been revisiting the idea of buying a Black-Bird.. a bike with valid claim to be the worlds fastest production motorcycle, that is actually 'restricted' to a mere 172mph..... and which is increasingly attractive now prices have fallen to around the £1500-£2000 mark.... so about as much 'fast' as money can buy, for the price of all the bits to make a very slow 125 marginally less very slow..... you do have to re-evaluate the VFM don't you?
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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?'
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Jay2903
Scooby Slapper



Joined: 03 May 2016
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PostPosted: 12:18 - 02 Nov 2016    Post subject: Re: WRX 125 -250 conversion Reply with quote
Jack_2016 wrote:
Was thinking of upgrading my Yamaha wr125x 2016. Already have aftermarket air and oil filter have a stainless manifold and full arrow exhaust. I plan to then bore it out with the Athena 180cc big bore kit and then hooking up either a power commander 3 or power commander 5. A friend said it would be cheaper to fit a 250 engine from the 250 WRX. Is it possible to put the 250 engine in and what would I need to do if possible ?


I'd highly reccomend not doing a 180 bore. My Friend had this done at a shop and it lasted less than a week before basically disintegrating.
He had to buy another 125 engine and ended up right back were he started.
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Fizzoid
World Chat Champion



Joined: 06 Sep 2016
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PostPosted: 12:38 - 02 Nov 2016    Post subject: Reply with quote
That's what happens when you get PC World's "Tech Guys" to work on your engine!

I take it the 'shop' weren't too keen on guaranteeing their work then?
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