Big bore kit for my bike?

jayjaymozza · Two Stroke Sniffer Joined: 02 Jan 2014 Karma :

Hi, I am just wondering what big bore kit will fit on my Superbyke RMX-125, on a 08 plate, the engine is a 4 valve, very similar the the hysoung engine.

Thanks

Fisty · Super Spammer Joined: 11 Apr 2007 Karma :

Buy a bigger bike.
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jayjaymozza · Two Stroke Sniffer Joined: 02 Jan 2014 Karma :

I dont have the money for a bigger bike yet or I would lol

Andy_Pagin · World Chat Champion Joined: 08 Nov 2010 Karma :

Bigger bike would probably be the cheaper option in the long run.
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jayjaymozza · Two Stroke Sniffer Joined: 02 Jan 2014 Karma :

I agree, for the mean time I need it for work though, but could do with abit more speed/power.

Andy_Pagin · World Chat Champion Joined: 08 Nov 2010 Karma :

For work? Well bear in mind you could well end up with something a whole lot less reliable than what you already have? Can you afford to be without transport when it packs up?
Then there's the legalities. Assuming you have a full licence, you'll need to inform your insurers, assuming they'll even touch the modification your premiums will go up, so might be worth checking with them first. Also you'll need to inform DVLA of the mod. What they make of that sort of thing I've no idea, you might have to pay out for a one-off type approval. You could well be into hundreds of pound of expense before you've even touched a spanner. So do you really need say another 10bhp that much.
____________________
They're coming to take me away, ho-ho, hee-hee, ha-haaa, hey-hey,
the men in white coats are coming to take me away.
Yamaha Vity -> YBR125 -> FZS600 Fazer -> FZ1-S Fazer

jayjaymozza · Two Stroke Sniffer Joined: 02 Jan 2014 Karma :

ah sh*t yes, I didnt even think of that -.-

What do you think the best option would be to get a few mph out of it / a little extra power.
I was thinking a performance air filter with new jets.

P. · Red Rocket Joined: 14 Feb 2008 Karma :

kramdra · World Chat Champion Joined: 28 Oct 2010 Karma :

its a shite engine, doubt it could handle a bigger bore. And neither would rest of the bike, brakes are shite.

An engine transplant from a RS3/YZF125 would be a lot of work or impossible, but is the only 4T 125 with decent power.

Teflon-Mike · tl;dr Joined: 01 Jun 2010 Karma :

kramdra · World Chat Champion Joined: 28 Oct 2010 Karma :

no. the engine will struggle producing 10bhp, it will not make 60mph with any ease. Steep hill? 30-40mph. Dual carriageway or motorway could be considered dangerous, being overtaken by coaches (who have 70mph limit) and possibly HGV's.

So not a better rider. One that likes pathetic old honda designs. Give the bike to Tef Laughing

webhead · Renault 5 Driver Joined: 22 Mar 2008 Karma :

have you taken out the restrictor in top of carb?????

have you taken restrictor out exhaust?????

do that first. then you see a different bike my friend and wont cost anything.

if you want to pay out a little money buy a vm26 v3 from ebay get a 115 jet ,get a good foam filter best 1,s are ramair get them from ebay too.

you will see 82mph not bad considering .

P. · Red Rocket Joined: 14 Feb 2008 Karma :

Ignore this piece of idiocy... It won't do more than 60, possibly 65 down a hill.

MCN. · Banned Joined: 31 Aug 2014 Karma :

jayjaymozza · Two Stroke Sniffer Joined: 02 Jan 2014 Karma :

Well I can tell you I can get 70MPH out of the bike easy on a flat, uphill it drops to 55, but can easy get 60MPH even in 4th so I don't know where youse are getting your 'info' from because it's bullshit.

Andy_Pagin · World Chat Champion Joined: 08 Nov 2010 Karma :

There's a world of difference between indicated speed and actual speed. Try comparing the speedo reading to that from a GPS app such as MyTracks. Seriously give it a go and let us know the results.
____________________
They're coming to take me away, ho-ho, hee-hee, ha-haaa, hey-hey,
the men in white coats are coming to take me away.
Yamaha Vity -> YBR125 -> FZS600 Fazer -> FZ1-S Fazer

P. · Red Rocket Joined: 14 Feb 2008 Karma :

- · Super Spammer Joined: 22 Oct 2013 Karma :

Teflon-Mike · tl;dr Joined: 01 Jun 2010 Karma :

Fisty · Super Spammer Joined: 11 Apr 2007 Karma :

kramdra · World Chat Champion Joined: 28 Oct 2010 Karma :

Does the speedo wobble around as much as mine? Same engine, same factory as quinqi 125-2d.

Indicated is usually 10% higher, not that these pieces of shit have any accuracy. You know this when HGVs pass you at 65 Laughing

moonzoomer · World Chat Champion Joined: 01 Jul 2012 Karma :

These bikes could be bought standard as a 150cc in most parts of the world but not the UK, big bore (150-170cc) kits are available for other Superbyke models for very little money (under 50 quid) but not the RMX model. I have bought a 150cc kit for my SB125 which did make a noticable difference without mods to the carb, that is my next stage of minor tuning with slightly bigger jets and a less restrictive air filter.
In the long term best to leave your bike as it is to enhance resale value and simply buy a more powerful/bigger machine when funds/licence allow as the cost of modification to your machine would exceed its total value.

moonzoomer · World Chat Champion Joined: 01 Jul 2012 Karma :

The Shaggy D.A. · Super Spammer Joined: 12 Sep 2008 Karma :

Northern Monkey · World Chat Champion Joined: 17 Nov 2013 Karma :

Fitting a screen will improve the aerodynamics, and improve the top speed by 2 or 3 mph

The problem is that it would look totally shit.
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