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Red_Stafford
Borekit Bruiser



Joined: 16 Mar 2007
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PostPosted: 22:46 - 26 May 2010    Post subject: First bike Reply with quote
Hi all, I am looking to do my CBT in the next couple of months and get myself a road bike but I also want a motox bike for taking to local tracks but I can't afford both so I was thinking about getting a supermoto 125cc, I am only 5ft 4in so I need something I can fit on, also when you own a supermoto do you have to change the bike depending wether you are off road or on road stuff such as wheels/Tyres and gearing ? What bike would you guys recomend I will use the bike to get to work and back which is about 4 miles all round and also for off roading on weekends ? I will have about £1k - £1.5k to spend maybe less
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TomDavies
Renault 5 Driver



Joined: 06 Jan 2009
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PostPosted: 12:37 - 28 May 2010    Post subject: Reply with quote
Hi, I had a yamaha dt 125 re. It had nobbly tires on so was more than capable off road. Not mega fast though and can't imagine it would be great on track.

Other bikes.. KTM EXC 125.. you could have 2 sets of wheels one with sm tires and the other with nobblys for the track.

Husqvarna wr 125, https://www.youtube.com/watch?v=VRzohP_VUfk same as above really these bikes are quite high maintenance though so I wouldn't imagine they would be great for commuting.

Apart from that really there's not many 125's which would be suitable for both track and road.

How about getting a cheap commuter (200-300 quid) then having a motocross specific bike?

By the way you will need to change the tires on a proper MX track supermoto tyres won't cut the mustard.

Anyway hope that helps.
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haven
L Plate Warrior



Joined: 28 May 2010
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PostPosted: 14:02 - 28 May 2010    Post subject: Reply with quote
Hi are you wanting a trail type bike or mx for your offroad stuff.
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G
The Voice of Reason



Joined: 02 Feb 2002
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PostPosted: 14:14 - 28 May 2010    Post subject: Reply with quote
If you're taking the bike to motocross tracks, the KTM/Husky will handle that fine - I'd go for the KTM for ease of availability of wheels etc.
You'd just have to swap the wheels, chain and caliper bracket over.
However, for a start it would not only be illegal to ride on a CBT, it'd also be illegal to ride on a 33hp licence. Whether that should bother you or not is another matter.

They don't come with an ignition barrel at all, or a steering lock - so gonna want a big chain where ever you are really.
The

If you've got transport for your bike and it's motocross you want to do, two seperate bikes would be better I reckon - you could get a DT125 and a CR125 for £1.5k all in and have more suitable bikes with less worry of damage to one causing problems for the other (too much use and breaking down so you can't do mx, or crashing mx so you can't commute.)
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wr125x2011
Nova Slayer



Joined: 25 May 2010
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PostPosted: 15:22 - 28 May 2010    Post subject: Reply with quote
yamaha wr125x Thumbs Up
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TomDavies
Renault 5 Driver



Joined: 06 Jan 2009
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PostPosted: 15:34 - 28 May 2010    Post subject: Reply with quote
needsy wrote:
yamaha wr125x Thumbs Up


125 4 stroke? wouldn't pull the skin off a rice pudding would it. Laughing

Good for commuting though.


G speaks sense, I forgot about the ktm and husqvarna producing way above the allowed bhp. Infact a yamaha dt is over the learner limit de-restricted (which most are) depends how legal you want to be I suppose.

Tom
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G
The Voice of Reason



Joined: 02 Feb 2002
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PostPosted: 15:46 - 28 May 2010    Post subject: Reply with quote
needsy wrote:
yamaha wr125x Thumbs Up

Can you easily fit road wheels to the WR125x? Either way, it’s well under powered and over weight for a motocross track even with the proper wheels – my 200EXC is a little heavy and underpowered for motocross, yet makes three times the power of the WR125, which weighs around a third more according to google. Also I doubt the suspension is anywhere near as good. Heck, my 690 as stock it seems only weighs a little more than the 125!

Oh and didn’t think you could get them for under £1500 yet either? – still rather overpriced for a 4 stroke commuter to my mind.
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wr125x2011
Nova Slayer



Joined: 25 May 2010
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PostPosted: 15:59 - 28 May 2010    Post subject: Reply with quote
G wrote:
needsy wrote:
yamaha wr125x Thumbs Up

Can you easily fit road wheels to the WR125x? Either way, it’s well under powered and over weight for a motocross track even with the proper wheels – my 200EXC is a little heavy and underpowered for motocross, yet makes three times the power of the WR125, which weighs around a third more according to google. Also I doubt the suspension is anywhere near as good. Heck, my 690 as stock it seems only weighs a little more than the 125!

Oh and didn’t think you could get them for under £1500 yet either? – still rather overpriced for a 4 stroke commuter to my mind.


I personally dont think they are underpowerd. 75-80mph is more then the legal speed limit for the road anyway Smile

just my two cents.
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G
The Voice of Reason



Joined: 02 Feb 2002
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PostPosted: 16:17 - 28 May 2010    Post subject: Reply with quote
needsy wrote:

I personally dont think they are underpowerd. 75-80mph is more then the legal speed limit for the road anyway Smile

just my two cents.

Erm, so have you ridden one on a motocross track then?.. And from that sounds like they're likely seriously over-geared to compound them being under-powered.
Sitting at a real 70mph while flat out on a straight road is very different to turning a tight hair pin, then trying to go up a forty five degree slope where you’re hoping to launch yourself a decent number of metres into the air!
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wr125x2011
Nova Slayer



Joined: 25 May 2010
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PostPosted: 16:36 - 28 May 2010    Post subject: Reply with quote
G wrote:
needsy wrote:

I personally dont think they are underpowerd. 75-80mph is more then the legal speed limit for the road anyway Smile

just my two cents.

Erm, so have you ridden one on a motocross track then?.. And from that sounds like they're likely seriously over-geared to compound them being under-powered.
Sitting at a real 70mph while flat out on a straight road is very different to turning a tight hair pin, then trying to go up a forty five degree slope where you’re hoping to launch yourself a decent number of metres into the air!

Hardly, They share the same engine as the YZF R125, so to say they are over geared is foolish, the enigne in both the RZF & the WR, are the same. And currently the fastest 4stroke 125 engine in production. Thumbs Up
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TomDavies
Renault 5 Driver



Joined: 06 Jan 2009
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PostPosted: 16:43 - 28 May 2010    Post subject: Reply with quote
needsy wrote:

Hardly, They share the same engine as the YZF R125, so to say they are over geared is foolish, the enigne in both the RZF & the WR, are the same. And currently the fastest 4stroke 125 engine in production. Thumbs Up


It may be the fastest four stroke 125 but that's like saying 'I won a gold medal...... at the special Olympics'

It's a shame yamaha scraped the dt125 engine as the wr 125 is a good looking bike (all the emissions crap I suppose.
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450 exc enduro
Lives in a lonely place near Nantwich, Cheshire
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G
The Voice of Reason



Joined: 02 Feb 2002
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PostPosted: 18:13 - 28 May 2010    Post subject: Reply with quote
needsy wrote:

Hardly, They share the same engine as the YZF R125, so to say they are over geared is foolish, the enigne in both the RZF & the WR, are the same. And currently the fastest 4stroke 125 engine in production. Thumbs Up

My CRM shared the engine with a NSR125, however that meant it was over-geared because of worse aerodynamics at speed - 20-24hp doesn't have a hope of hitting 100mph in an upright bike.
However, of course - sharing the same engine doesn't mean sharing the same final driving gearing

Anyway, even that's still rather missing the point - did you read the bit about a motocross track? This is what it's over-geared, under powered and over weight for, for road riding no doubt it's 'acceptable'. Though I would go for the MZ125SM - which isn't available new, but is otherwise a very similar bike for a hell of a lot less money.
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Red_Stafford
Borekit Bruiser



Joined: 16 Mar 2007
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PostPosted: 10:18 - 30 May 2010    Post subject: Reply with quote
G wrote:
If you're taking the bike to motocross tracks, the KTM/Husky will handle that fine - I'd go for the KTM for ease of availability of wheels etc.
You'd just have to swap the wheels, chain and caliper bracket over.
However, for a start it would not only be illegal to ride on a CBT, it'd also be illegal to ride on a 33hp licence. Whether that should bother you or not is another matter.

They don't come with an ignition barrel at all, or a steering lock - so gonna want a big chain where ever you are really.
The

If you've got transport for your bike and it's motocross you want to do, two seperate bikes would be better I reckon - you could get a DT125 and a CR125 for £1.5k all in and have more suitable bikes with less worry of damage to one causing problems for the other (too much use and breaking down so you can't do mx, or crashing mx so you can't commute.)


Makes sense I suppose, but I have heard that the MX125 is a very fun bike on and off the road.

I might just get a RS125 or Mito 125 then for the road and a proper MX bike for the track trouble is that means I will have to spend money sorting transport out for the MX bike.
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shawncanry
L Plate Warrior



Joined: 27 May 2010
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PostPosted: 10:28 - 31 May 2010    Post subject: Reply with quote
I had a Suzuki RG-80. I thought it was great at the time. The best I got out of it was about 95mph. Going downhill. With a wind behind me. Course I was about two stone lighter then, so I would probably get barely 40mph out of the same bike now!
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drzsta
World Chat Champion



Joined: 20 Apr 2009
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PostPosted: 17:57 - 01 Jun 2010    Post subject: Reply with quote
G wrote:
If you're taking the bike to motocross tracks, the KTM/Husky will handle that fine - I'd go for the KTM for ease of availability of wheels etc.
You'd just have to swap the wheels, chain and caliper bracket over.
However, for a start it would not only be illegal to ride on a CBT, it'd also be illegal to ride on a 33hp licence. Whether that should bother you or not is another matter.

They don't come with an ignition barrel at all, or a steering lock - so gonna want a big chain where ever you are really.
The

If you've got transport for your bike and it's motocross you want to do, two seperate bikes would be better I reckon - you could get a DT125 and a CR125 for £1.5k all in and have more suitable bikes with less worry of damage to one causing problems for the other (too much use and breaking down so
you can't do mx, or crashing mx so you can't commute.)



If he does his CBT he will be restricted to more like 13hp not 33hp, he didnt mention that he was doing he A2 which would mean he was restricted to 33hp - plus i doubt the manufacturers claimed 40hp+ of a 125 mx bike is really accurate - you'd see no where near that at the wheel.
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G
The Voice of Reason



Joined: 02 Feb 2002
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PostPosted: 18:02 - 01 Jun 2010    Post subject: Reply with quote
Yea, was just pointing out that it probably wouldn't even be legal if he DID pass his restricted test, nevermind for 14.6hp learner limit!
The 33hp restriction also has a power to weight limit, which I believe even with under 33hp, these bikes are quite likely to break as they tend to be pretty light.
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drzsta
World Chat Champion



Joined: 20 Apr 2009
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PostPosted: 18:06 - 01 Jun 2010    Post subject: Reply with quote
Embarassed

as soon as it looks like i know something, you've knocked me back down Laughing
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G
The Voice of Reason



Joined: 02 Feb 2002
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PostPosted: 19:41 - 01 Jun 2010    Post subject: Reply with quote
Apparently it's .16kw/kg - which is .21hp/kg.
So a 100kg bike (new 125EXC is a little under this no fuel, older ones a little over) should technically be limited to 21hp or so - maybe a bit more if you include fuel. Seen outside sources suggesting 35-37hp for them, which doesn't seem too unreasonable - feels about right from my 200 which has a tiny bit more top end than the 125 it's based on.
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