Help & FAQs    Search BCF    Members    Groups    Events Calendar
Resend my activation email : Register : Log in 
BCF: Bike Chat Forums


What's the deal with 2-stroke 125s?

 Reply to topic
Bike Chat Forums Index -> New Bikers
View previous topic : View next topic  
Author Message

huskie69
Spanner Monkey



Joined: 10 Nov 2010
Karma :
PostPosted: 22:22 - 15 Dec 2010    Post subject: What's the deal with 2-stroke 125s? Reply with quote
Hi all. I don't know much about engines and metal and stuff, and was wondering why a 2stroke 125 like the nsr125 has about 3 times more power than 4stroke bikes? Looking at specs for these 2 stroke bikes (nsr for example) they're running at about 30bhp.

Can a person with just a CBT legally ride one of these (as they're still only 125s) or is there also a power restriction on the CBT?
____________________
'10 Skyjet SJ125-23 - Crashed Sad > '09 YBR 125 > '53 Suzuki SV650 - Died Sad > 2010 Suzuki VanVan 125 > '87 Yamaha FZ750 Sold > VTR 1000 FireStorm - Sold > Honda CB1000R
 Back to top
View user's profile Send private message Send e-mail Visit poster's website You must be logged in to rate posts

blurredman
World Chat Champion



Joined: 18 Sep 2010
Karma :
PostPosted: 22:29 - 15 Dec 2010    Post subject: Reply with quote
There is a 14.6 hp restriction with CBT Razz
____________________
CBT: 12/06/10, Theory: 22/09/10, Module 1: 09/11/10, Module 2: 19/01/11
Past: 1991 Honda CG125BR-J, 1992 (1980) Honda XL125S, 1996 Kawasaki GPZ500S, 1979 MZ TS150.
Current: 1973 MZ ES250/2 - 18k, 1979 Suzuki TS185ER - 10k, 1981 Honda CX500B - 91k, 1987 MZ ETZ250 (295cc) - 40k, 1989 MZ ETZ251 - 51k.
 Back to top
View user's profile Send private message Send e-mail Visit poster's website You must be logged in to rate posts

Drake
World Chat Champion



Joined: 01 Oct 2010
Karma :
PostPosted: 22:33 - 15 Dec 2010    Post subject: Reply with quote
most 125 two strokes hav a learner legal version which upon passing your test can be derestricted granted its under 333bhp nd the bhp per kg limit
____________________
was: derbi senda, aprilia sx125, nsr250 mc16, cagiva mito, cb600 hornet now: mk1 bandit, KR1S, landrover series 3 light weight 2.5 petrol, 5speed box
 Back to top
View user's profile Send private message Send e-mail You must be logged in to rate posts
Relentless This post is not being displayed because the poster is banned. Unhide this post / all posts.

The Artist
Super Spammer



Joined: 06 Jan 2008
Karma :
PostPosted: 22:41 - 15 Dec 2010    Post subject: Reply with quote
drake1994 wrote:
most 125 two strokes hav a learner legal version which upon passing your test can be derestricted granted its under 333bhp nd the bhp per kg limit


No bhp per kg limit.

Just 33bhp after passing A2 for 2 years.
 Back to top
View user's profile Send private message Send e-mail You must be logged in to rate posts

Drake
World Chat Champion



Joined: 01 Oct 2010
Karma :
PostPosted: 22:42 - 15 Dec 2010    Post subject: Reply with quote
i think i sliped a fair bit but im sure gettin a two stroke then derestricting it is far cheaper than a 125 4 banger nd then a bigger bike
____________________
was: derbi senda, aprilia sx125, nsr250 mc16, cagiva mito, cb600 hornet now: mk1 bandit, KR1S, landrover series 3 light weight 2.5 petrol, 5speed box
 Back to top
View user's profile Send private message Send e-mail You must be logged in to rate posts
Relentless This post is not being displayed because the poster is banned. Unhide this post / all posts.

UnspeedySam
World Chat Champion



Joined: 25 Nov 2009
Karma :
PostPosted: 22:55 - 15 Dec 2010    Post subject: Reply with quote
The Artist wrote:
drake1994 wrote:
most 125 two strokes hav a learner legal version which upon passing your test can be derestricted granted its under 333bhp nd the bhp per kg limit


No bhp per kg limit.

Just 33bhp after passing A2 for 2 years.

"With this licence you are entitled to ride a motorcycle up to 25kW (33 bhp) and a power to weight ratio not exceeding 0.16kw/kg."

Hence the fact the Aprilia RS125 isn't A2 licence legal despite being under 33bhp. Not sure about the NSR.

However what has been said about these 2 stroke race reps is indeed true; they are generally sold in a restricted form to make just under the 14.6bhp limit. However, even restricted they'll still be a lot faster than a 10bhp 4 stroke commuter 125. Heck...even my RXS100 is a LOT faster than the YBR125 (borrowed from a friend) I'm riding at the moment to do my test on.
____________________
Riding: BMW R1150RT `02 bought mildly crashed
Fixing: Also the BMW as I get less broken bits
Gone: ZZR600 '00, TRX850 '97, RXS100 '93, JS125-6B '07, BMW R1100RS '93, Kawasaki ZX-6R-J2 '01, Honda Bros NT400 NC25 '88
 Back to top
View user's profile Send private message You must be logged in to rate posts

Livefast123
Nearly there...



Joined: 14 Mar 2010
Karma :
PostPosted: 22:59 - 15 Dec 2010    Post subject: Reply with quote
Depends what you want the bike for Thumbs Up

I have both, a Comet GT 250 fourstroke for the daily commute and a NSR125 RR for when I need the aroma of 2 stroke!!

I wouldn't want to use the NSR on the daily commute as it would cost a fortune in petrol and 2 stroke but then again it's a far more characterful bike to ride. The Comet plods into work everyday sipping at it's fuel supply and starting in -10 temps.

Two bikes which have roughly the same power output but totally different
____________________
Current ride - Yamaha MT-07
 Back to top
View user's profile Send private message Send e-mail You must be logged in to rate posts

The Artist
Super Spammer



Joined: 06 Jan 2008
Karma :
PostPosted: 23:02 - 15 Dec 2010    Post subject: Reply with quote
beechbone wrote:

"With this licence you are entitled to ride a motorcycle up to 25kW (33 bhp) and a power to weight ratio not exceeding 0.16kw/kg."

Hence the fact the Aprilia RS125 isn't A2 licence legal despite being under 33bhp. Not sure about the NSR.
.


True but no one really takes any notice of the power weight thing. Even less so than the 33bhp rule in the first place.
 Back to top
View user's profile Send private message Send e-mail You must be logged in to rate posts
Relentless This post is not being displayed because the poster is banned. Unhide this post / all posts.

UnspeedySam
World Chat Champion



Joined: 25 Nov 2009
Karma :
PostPosted: 23:10 - 15 Dec 2010    Post subject: Reply with quote
Livefast123 wrote:
The Comet plods into work everyday sipping at it's fuel supply and starting in -10 temps.

Two bikes which have roughly the same power output but totally different

I've always found my RXS to be a lot easier and quicker to start in the cold than my friends' 4 stroke 125s. The YBR I'm on for my test at the moment takes about 5 minutes before it warms up properly in this weather.

The Artist wrote:
True but no one really takes any notice of the power weight thing. Even less so than the 33bhp rule in the first place.

I suppose so. For some odd reason I actually got a 33bhp bike, but I am rather pleased with my Bros, even if I've only ridden it a few hundred yards.
____________________
Riding: BMW R1150RT `02 bought mildly crashed
Fixing: Also the BMW as I get less broken bits
Gone: ZZR600 '00, TRX850 '97, RXS100 '93, JS125-6B '07, BMW R1100RS '93, Kawasaki ZX-6R-J2 '01, Honda Bros NT400 NC25 '88
 Back to top
View user's profile Send private message You must be logged in to rate posts
Old Thread Alert!

The last post was made 15 years, 100 days ago. Instead of replying here, would creating a new thread be more useful?
  Display posts from previous:   
This page may contain affiliate links, which means we may earn a small commission if a visitor clicks through and makes a purchase. By clicking on an affiliate link, you accept that third-party cookies will be set.

Post new topic   Reply to topic    Bike Chat Forums Index -> New Bikers All times are GMT
Page 1 of 1

 
 You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum
You cannot attach files in this forum
You cannot download files in this forum

Read the Terms of Use! - Powered by phpBB © phpBB Group
 
Debug Mode: ON - Server: birks (www) - Page Generation Time: 0.07 Sec - Server Load: 0.84 - MySQL Queries: 13 - Page Size: 77.28 Kb