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Honda xr 125 de-restriction

cookay
Joined Nov 2004
3 posts

hi,

i have just bought a xr 125, i have removed the air box snorkle which has give it a bit more response its overheating now though so im gunna rejet the carb. anyone got any other ideas on how to de-restrict this machine??

Tuesday, 30 November 2004

Discussion Archived

CMB
Joined Aug 2004
65 posts

Who told you you that could derestrict it? It's a 4-stroke, these aren't usually derestrictable in the way you can derestrict a 2-stroke learner legal bike. They're usually designed to produce the power they make as standard, I'm not aware of any four-stroke 125 that isn't. If it's overheating that's because you've weakened the fuel/air mixture (now too much air), I'd put the snorkle back if you don't want to seize it. If you want a quick 125 you really need a 2-stroke, otherwise I'd say get a bigger engined four-stroke bike.

Tuesday, 30 November 2004

Discussion Archived

cookay
Joined Nov 2004
3 posts

it is factory restricted like every other bike sold, i am going to re jet the carb to richen off the mixture slightly.

Tuesday, 30 November 2004

Discussion Archived

CMB
Joined Aug 2004
65 posts

I doubt that very much, the UK learner law is now 14.6bhp - there aren't any (road) 4-stroke 125s that make more power this. Your XR125 was designed to fall under this limit, there's little you can do to change that other than tune it which on a 4-stroke isn't cheap. Making a bike from scratch that falls into the learner-legal band isn't the same as restricting a more powerful 2-stroke engine so learner riders can use it - i.e. with the Aprilia RS's, restricted they make less than half the power they're capable of. I think you're wasting your time personally, if you want to go quicker on a 125 you need a 2-stroke like say the Aprilia which are derestrictable for nearly 30-odd hp. Or for something cheaper, you could get a DT125R. Rejetting to richen the mixture will only slow it down unless you're doing this after fitting a power pipe.

Wednesday, 1 December 2004

Discussion Archived

cardiffdrz
Joined Dec 2004
6 posts

Yep what he said above

Sunday, 26 December 2004

Discussion Archived


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